Hardware, Fastners, Constant Force Springs, and Other Misc. Components -SDP/SI

Hardware and Miscellaneous Components

At SDP/SI, we offer an extensive selection of hardware and miscellaneous components to meet the needs of engineers, designers, and manufacturers. Our inventory includes precision socket head shoulder screws, corrosion-resistant molded machine screws, Long-Lok spring plungers, and both metal and plastic threaded rods, available in a variety of inch and metric sizes. We also provide a wide range of washers, knobs, handles, spacers, shims, retaining rings, and springs—each crafted for durability and performance. If our standard offerings don’t meet your specific requirements, we provide modification and custom design services to ensure you get exactly what you need for your application.

In addition to these hardware essentials, SDP/SI specializes in spring-powered solutions and unique spring products. Our Constant Force Springs, extension springs, Neg'ator® spring motors, and spring-powered reels serve a broad spectrum of industries including medical, aerospace, and retail. We also offer compact spring-powered reels for point-of-purchase displays and base-mounted assemblies for counterbalances. Explore our full catalog to find high-quality components tailored for your next project, with the flexibility to customize for specific applications.

Fine Threaded Screws

Fine Threaded Screws from SDP/SI are crafted for precision fastening in high-performance applications. Made from high-quality materials, these screws feature sharp threads that offer excellent grip and reliable holding power. Ideal for use in machinery, electronics, and instruments where fine adjustments and secure connections are necessary, they provide enhanced thread engagement and resistance to vibration. Available in a variety of sizes, they ensure a precise fit for a range of complex assemblies.

Anti-Backlash Springs

Available In:

Materials: Stainless Steel
Max. Angular Deflection Deg. ± 10%: 18 in. - 40 in.
Max. Mandrel Size: 0.189 in. - 0.792 in.

SDP/SI's Backlash Springs are precision-engineered torsion springs designed to minimize backlash in gear assemblies. Made from high-strength 302 stainless steel in spring temper, these left-hand wound springs provide consistent anti-backlash performance and long-term reliability. Ideal for maintaining precise engagement in applications requiring minimal gear play, they help improve accuracy and reduce wear in mechanical systems.

Belleville Spring Washers

Available In:

Materials: Spring Steel, Stainless Steel
Inner Diameter Min.: 0.093 in. - 0.750 in.
Outer Diameter Max.: 0.187 in. - 1.500 in.
**Priced Per 10 Pieces

Belleville Spring Washers from SDP/SI offer effective load distribution and vibration resistance for fastened assemblies. Their conical shape absorbs loads, maintains pressure, and prevents loosening, making them ideal for automotive, aerospace, and industrial applications. Crafted from durable materials, these washers ensure long-lasting, secure connections in dynamic environments. Available in various sizes, they provide reliable performance in tight spaces. Trust SDP/SI’s Belleville washers for enhanced system stability and longevity.

Adjustable Cams, Molded Cams, & Cam Assemblies

Available In:

Materials: Steel, Acetal
Bore Size: 0.125 in. (3mm) - 0.5010 in. (6mm)
Rise Per 15° (molded only): 0.00 in. (0.0mm) - 0.04 in. (1.0mm)

SDP/SI’s Adjustable Cams, Molded Cams, and Cam Assemblies are precision-engineered components that provide reliable, adjustable motion control in a variety of mechanical systems. These cams are ideal for applications requiring accurate positioning and smooth transitions. Made from durable materials, they are available in various configurations and sizes to meet the needs of custom automation systems, machinery, and equipment. Easy to install and adjust, these components ensure consistent, high-performance operation in demanding applications. Trust SDP/SI for dependable cam solutions designed for efficiency and precision.

Socket Head Cap Screws

Available In:

Materials: Stainless Steel, Nylon, Steel
Length: 1/8 in. (3mm) - 2 in. (70mm)
**Priced Per 100 Pieces

SDP/SI’s Socket Head Cap Screws are designed for secure fastening in precision applications, featuring a cylindrical head and an internal hex drive for easy installation. Made from high-quality materials, they provide strong holding power and are ideal for tight spaces where a standard wrench cannot be used. Available in various sizes and thread types, these screws are perfect for mechanical assemblies, automation, and machinery that require a durable, compact fastening solution. Trust SDP/SI for reliable, high-performance socket head cap screws.

Cam Followers

Available In:

Stud Length: 0.750 in. - 2.250 in.
Roller Diameter: 0.625 in. - 2.50 in.
Stud Diameter: 0.250 in. - 1.00 in.

SDP/SI’s Cam Followers are designed to support loads while positioning workpieces with an outer roller that runs on a flat surface and a threaded stud for mounting. Available in both metal and plastic designs, the plastic cam followers with high-load-capacity rollers provide a maintenance-free alternative to traditional metal versions. These are ideal for high-speed, lightweight applications, especially in cleanroom environments. Plastic cam followers offer significant cost savings, reduce rail wear, and provide years of reliable operation without the need for lubrication systems, making them a durable solution for many applications.

Constant Force Springs

Available In:

Load (±10): 0.23 - 40.90 lbs
Band Length: 10 in. - 69 in.
Width: 0.1875 in. - 2.0000 in.

Constant Force Springs provide a uniform force over a wide range of motion, making them ideal for applications requiring smooth, consistent tension. Unlike traditional springs that increase force with deflection, these springs deliver constant load and are often used in counterbalance systems, cable retractors, and medical devices. SDP/SI offers high-quality constant force springs in various sizes and configurations, delivering long life and reliable performance. Their compact design and smooth operation make them an excellent solution for space-constrained and precision-driven applications.

Compression Springs

Available In:

Outer Diameter: 0.057 in. (2.25mm) - 0.720 in. (18.30mm)
Wire Diameter: 0.006 in. (0.25mm) - 0.072 in. (2.00mm)
Free Length: 0.25 in. (6.5mm) - 2.00 in. (40.0mm)

Compression springs are open-coil helical springs designed to resist axial compressive forces. When compressed, they store energy and provide resistance, returning to their original length when the load is released. Commonly used in automotive, aerospace, industrial machinery, and medical devices, compression springs are versatile and reliable components. SDP/SI offers precision-engineered compression springs in a variety of sizes and materials to meet the demands of both light-duty and high-load applications. Their durability and consistent performance make them essential for motion control and mechanical force management.

Dials

Available In:

Outer Diameter: 0.99 in. - 4.00 in.
Number of Graduations: Blank - 360
Inner Diameter: 0.375 in.

SDP/SI offers a comprehensive selection of precision dials designed for accurate setting, indexing, and measurement in mechanical systems. Our product line includes disc dials, drum dials, plate dial indexes, precision drum dial indexes, and precision disc dial indexes, all crafted for clarity, durability, and ease of integration. These dials are ideal for applications requiring fine adjustments or repeatable settings, such as instrumentation, automation, and control systems. Available in a variety of sizes and configurations, SDP/SI dials support both inch and metric systems for versatile use.

Electromechanical Limit Stops

Available In:

Rotation Limit Degrees: 0 - 15,150
Max Torque Capacity: 150 ozf in.

Electromechanical Limit Stops are precision devices designed to halt or control the motion of mechanical components at a predetermined position. Ideal for automation and positioning systems, these stops integrate electrical and mechanical functions to provide accurate, repeatable stopping points. They often include sensors or switches to signal when the stop has been reached, making them suitable for applications requiring safety interlocks or automated feedback. SDP/SI offers reliable, high-performance limit stops that enhance system control while reducing wear and improving operational accuracy in motion-based applications.

Extension Springs

Available In:

Outer Diameter: 0.063 in. (2.5mm) - 1.000 in. (19.0mm)
Free Length: 0.25 in. (9.5mm) - 5.00 in. (130mm)

Extension Springs from SDP/SI are designed to absorb and store energy by resisting a pulling force. These tightly wound coils are engineered with hooks, loops, or other end configurations to attach to components under tension. Manufactured for precision and durability, they return to their original shape when the force is released, making them ideal for applications requiring controlled tension and reliable performance. SDP/SI offers a range of materials and sizes to meet the demands of industries such as aerospace, medical, robotics, and general industrial machinery.

Flexi-Hinges

Available In:

Outer Diameter: 0.125 in. - 1.000 in.
Length: 0.2 in. - 1.6 in.
Spring Rating: 0.0003 - 7.8023 lbf in. / deg

Flexi-Hinges from SDP/SI are compact, one-piece mechanical components that function as flexible joints, allowing for angular movement without the need for complex assemblies. Molded from durable plastic materials, they are designed to provide consistent, repeatable motion in applications where space is limited and traditional hinges are impractical. These zero-maintenance hinges are ideal for enclosures, panels, and lightweight doors, offering high reliability and long service life. Their precise design makes them well-suited for use in medical devices, instrumentation, and electronic housings.

Geneva Mechanisms

Available In:

Driver Motion: 180° - 360°
Intermittent Driven Motion: 45° - 90°
Intermittent Driven Motion: 4 - 8

Geneva mechanisms are precision indexing devices that convert continuous rotary motion into intermittent motion, making them ideal for applications requiring accurate, step-by-step movement such as indexing tables and automated machinery. SDP/SI offers durable, high-quality Geneva mechanisms in various sizes and configurations. Each mechanism features a drive wheel and a slotted driven wheel, allowing for consistent, repeatable positioning with each rotation.

Precision Hand Cranks

Available In:

Outer Diameter: 2 in.
Width: 1 1/4 in.
Inner Diameter: 0.1248 in. - 0.2498 in.

SDP/SI offers a selection of durable hand cranks designed for manual operation of machinery, jigs, fixtures, and mechanical assemblies. These cranks provide smooth, efficient control for adjusting position, tension, or alignment in a wide range of industrial and laboratory applications. Available in various styles and materials, including fixed and folding handles, they are built for strength, ease of use, and long service life. Whether for prototyping or production environments, SDP/SI hand cranks deliver dependable performance with ergonomic design for operator comfort.

Handles

Available In:

Materials: Aluminum, Brass, Stainless Steel
Height: 1 9/32 in. - 1 3/4 in.
Length: 3 in. - 9 in.

Handles from SDP/SI are designed for OEM and engineering applications, offering reliable performance and ergonomic functionality. Available in a variety of styles, materials, and mounting options, these industrial-grade handles are ideal for enclosures, machinery, equipment panels, and custom assemblies. Whether you need fixed, folding, or recessed designs, our selection provides durable solutions to meet your specific application needs.

Hexagonal Wrenches

Available In:

Width: 0.028 in. (0.71mm) - 3/8 in.(6mm)
Length (mm only): 30 mm - 90 mm

SDP/SI offers precision hexagonal wrenches ideal for assembly and adjustment of mechanical components requiring hex drive fasteners. These tools are crafted for durability and accuracy, ensuring a proper fit with set screws, bolts, and other hex socket components used in small-scale and precision applications. Available in various inch and metric sizes, they are a reliable addition to any technician’s or engineer’s toolkit. Whether for prototyping or maintenance, these wrenches help ensure consistent torque and minimal risk of stripping or slippage during assembly.

Keys & Key Stocks

Available In:

Width: 0.0625 in. (1.5mm) - 1.500 in. (16mm)
Length: 0.5 in. (6mm) - 3.0 ft. (63mm)

SDP/SI offers a variety of high-quality keys and key stocks designed to provide a secure, reliable connection between shafts and components. These precision-engineered components are available in different sizes and materials, including steel and stainless steel, to meet the specific needs of your application. Keys and key stocks are essential for preventing relative motion between machine parts, ensuring smooth and efficient torque transmission in industrial machinery, automotive, and power transmission systems. They are available in both standard and custom configurations to suit various engineering requirements.

Knurled Knobs

Available In:

Inner Diameter: 0.1248 in. - 0.2498 in.
Outer Diameter: 1.0 in. - 2.0 in.

SDP/SI’s Knurled Knobs offer a secure, ergonomic solution for manual adjustments in a variety of mechanical and electronic applications. Designed with textured, knurled surfaces, these knobs provide a comfortable grip for precise, tool-free operation. Available in a range of sizes and materials, including metal and plastic, they are ideal for applications requiring frequent adjustments, such as in machinery, enclosures, and equipment. These knobs ensure easy installation and long-lasting reliability, enhancing both functionality and user experience in industrial and laboratory settings.

Cleaning Oil & Lubricants

Available In:

Size: 14 oz - 16 oz

SDP/SI’s Cleaning Oils and Lubricants are designed to improve the performance and longevity of mechanical components by providing effective cleaning and lubrication. These products help reduce friction, minimize wear, and prevent corrosion, ensuring smooth operation in a wide range of industrial and precision applications. Suitable for use on gears, bearings, and other moving parts, these high-quality oils and lubricants are available in various formulations to meet specific requirements, offering reliable protection and maintenance for both high and low-load environments.

Neg'ator Spring Motor Assemblies

Available In:

Spring Torque (lb-in.): 0.1 - 15.5
Cable Tension (lbs): 0.375 - 15.000

Neg'ator Spring Motor Assemblies from SDP/SI offer a compact, reliable solution for generating rotary motion from stored spring energy. These spring motors are ideal for applications requiring consistent torque over a range of motion, such as in clocks, timers, and small mechanical devices. Designed for easy installation and minimal maintenance, they feature durable components for long-lasting performance. Available in various sizes and configurations, these spring motor assemblies provide efficient, energy-saving solutions for systems that need a mechanical drive without electrical power.

Hexagonal Nuts

Available In:

Materials: Stainless Steel, Nylon, Steel
Thread Sizes: #0-80 in.(M1.6x0.35) 1/4-20 in. (M12x1.75)
**Priced Per 100 Pieces

SDP/SI’s Hexagonal Nuts provide a reliable fastening solution for securing components in a wide range of mechanical assemblies. These nuts are precision-made to fit standard bolts and screws, offering secure, vibration-resistant connections. Available in various sizes and materials, including stainless steel, they are ideal for use in industrial, automotive, and electronic applications. Whether you're working on machinery, structural systems, or precision equipment, these hexagonal nuts ensure reliable performance and ease of assembly.

Panel Bushings

Available In:

Materials: Brass, Aluminum
Bore: 0.127 in. and 0.252 in.
Hex Nut: 3/8 in. - 1/2 in.

SDP/SI’s Panel Bushings are designed to provide a secure, insulated mounting solution for electrical and mechanical components that pass through panel openings. These bushings help prevent wear and tear on cables, wires, or rods, ensuring safe, vibration-resistant connections. Made from durable materials such as nylon or plastic, they are available in various sizes and configurations to fit different panel thicknesses and application needs. Ideal for control panels, enclosures, and electronic systems, they simplify installation and protect sensitive equipment from damage.

Pins

Available In:

Diameter: 0.0312 in. (1mm) - 0.2502 in. (6mm)
Length: 0.094 in. (4mm) - 2.500 in. (80mm)
**Priced Per 100-1000 Pieces

SDP/SI offers a wide selection of precision pins for OEM and engineering applications, including dowel pins, spring pins, and grooved pins. These components are essential for accurate alignment, fastening, and locating in mechanical assemblies. Manufactured from durable materials and available in a range of sizes and tolerances, our pins ensure secure and consistent performance in demanding environments.

Spring Plungers

Available In:

Diameter: M3 - M24
Length: 7 mm - 48 mm

Spring Plungers are compact, spring-loaded devices designed to align, hold, or latch components in a fixed position by applying pressure through a ball or nose that nests into a corresponding hole or receptacle. This action allows two or more parts to be securely positioned with consistent force. SDP/SI offers a wide range of spring and ball plungers ideal for OEM and engineering applications where precision and repeatability are essential. Ball plungers, which feature a shallow ball tip for smooth, easy movement in and out of position, are ideal for light-load applications such as jigs, dies, fixtures, indexing devices, and gear shifters. Spring plungers provide secure alignment and pressure without requiring mechanical retraction, making them a practical choice for locating and positioning components where moderate force is sufficient and side loads are minimal.

Retaining Rings

Available In:

Materials: Stainless Steel, Copper, Steel
Shaft Diameter: 0.25 in. (1mm) - 2.775 in. (26.2mm)
Ring Clearance Diameter: 0.22 in. (2mm) - 3.60 in. (143.1mm)
Groove Diameter: 0.26 in. (0.8mm) - 2.838 in. (116mm)

Retaining Rings are essential components for securing parts on shafts or in bores by clamping around the mating surface to form a positive shoulder and prevent axial movement. SDP/SI offers a comprehensive range of retaining rings—everything from classic E‑rings and external rings (including bowed designs for enhanced spring tension) to internal rings for bore applications and innovative no‑groove axial assembly rings that snap into place without machining. Available in a variety of materials, finishes, and sizes, our retaining rings deliver reliable performance in OEM and engineering assemblies where precise component retention is critical.

Molded Screw Insulators

Available In:

Inner Diameter: 0.09 in. - 0.26 in.
Outer Diameter: 0.120 in. - 0.312 in.

Molded screw insulators are used to electrically isolate screws, bolts, and other fasteners from conductive surfaces in electronic and mechanical assemblies. These components are essential in preventing electrical shorts and ensuring proper insulation in high-voltage or sensitive environments. SDP/SI offers molded screw insulators in various sizes and materials to accommodate a wide range of screw diameters and application requirements. Designed for durability and ease of installation, they provide a secure, non-conductive barrier that maintains electrical integrity without compromising mechanical performance.

Metal Set Screws

Available In:

Materials: Stainless Steel, Steel, Nylon
Thread Size: #0-80in.(M2) - 1/4-20in.(M16x2)
Length: 1/16 in. (3mm)- 7/8 in. (53.3mm)

Metal set screws are crucial fastening components used to secure one object within or against another, typically without the use of a nut. Commonly used in gear, pulley, and collar assemblies, these screws are threaded along their entire length and are tightened to create a strong, reliable hold. SDP/SI offers a variety of metal set screws in different materials, sizes, and tip styles—such as cup point, flat point, and cone point—to suit a wide range of mechanical and OEM applications. Designed for strength and precision, our set screws ensure secure positioning and resistance to loosening under vibration or torque.

Shims and Spacers

Available In:

Materials: Stainless Steel, Steel, Brass
Inner Diameter: 0.125 in.(3mm) - 1.001 in.(18mm)
Outer Diameter: 0.1875 in.(3mm) - 1.500 in.(24mm)

Shims and spacers are precision components used to control spacing and alignment in mechanical assemblies, but each serves a distinct purpose. Shims, resembling flat washers, are thin, accurately manufactured pieces used to fine-tune positioning, compensate for wear, or create precise clearances. Often made from non-ferrous metals or specialty materials, shims feature smooth corners, flat edges, and uniform thickness to ensure consistent performance. Spacers, also known as stand-offs, are fixed-size components designed to maintain a specific distance between two parts. Available in a range of materials and thicknesses, spacers can also function as axles, bushings, sleeves, or pins, providing structural support in a variety of OEM and engineering applications. SDP/SI offers a broad selection of both shims and spacers to meet demanding tolerances and design requirements.

Socket Head Shoulder Screws

Available In:

Thread Size: #4-40unc-3A(M2x0.4) - 1/4-20(M10x1.5)
Outer Diameter: 0.1875 in. (5.0mm) - 0.7500 in. (20mm)
Thread Length: 0.15625 in. (4mm) - 0.62500 in. (16mm)

Socket Head Shoulder Screws are precision fasteners designed with a cylindrical shoulder and a recessed hex socket for easy installation and tightening. These screws are ideal for applications where precise positioning, rotation, or movement is required, as the shoulder provides a stable bearing surface while the threaded portion secures the fastener in place. Typically used in machinery, jigs, and fixtures, socket head shoulder screws are available in a variety of materials and sizes to meet specific load, strength, and environmental requirements. SDP/SI’s selection of shoulder screws offers durability, ease of assembly, and reliable performance for both OEM and engineering applications.

Spring-Powered Reels

Available In:

Cable Length: 42 in. - 162 in.
Retracting Force (lbs): 0.5 - 35.0

Spring-powered Reels are compact, self-contained devices that store and release rotational energy using a negator spring mechanism. They are commonly used in applications requiring smooth, controlled retraction, extension, or constant force. SDP/SI offers both Arbor-Mounted Reels and Spir'ator® Reels to suit a range of engineering and OEM needs. Arbor-Mounted Reels are designed for mounting on a central shaft and are ideal for use in cable retraction, counterbalancing, and tensioning systems. Spir'ator Reels, a proprietary design, feature a spring-driven hub that delivers consistent torque in a compact form factor, making them ideal for precise motion control and space-constrained applications. Both types offer reliable, maintenance-free operation and can be tailored to specific torque, deflection, and space requirements.

Spring Posts

Available In:

Cable Length: 42 in. - 162 in.
Diameter: 1/8 in.(3mm) - 1/4 in.(6mm)

Spring Posts are precision components used to anchor and guide constant force or negator springs in a wide range of mechanical assemblies. Designed to securely hold the inner or outer coil of a spring, these posts ensure smooth operation, consistent tension, and proper alignment throughout the spring’s movement. SDP/SI offers spring posts in various sizes and materials to accommodate different spring diameters and torque requirements. Whether used in counterbalance systems, retractable mechanisms, or spring-powered reels, spring posts provide a reliable mounting solution that enhances the efficiency and longevity of spring-based designs.

Round Standoffs

Available In:

Height: 1/8 in. - 1/2 in.
Length: 0.075 in. - 0.230 in.

Round Standoffs are cylindrical spacers used to create precise, fixed distances between two components in an assembly. Commonly used in electronics, mechanical systems, and structural applications, they provide support, alignment, and spacing for parts such as circuit boards, panels, or gears. SDP/SI offers round standoffs in a variety of lengths, diameters, materials, and thread configurations to meet diverse design requirements. Whether used for mounting, insulating, or spacing, these durable components ensure reliable positioning and structural integrity in OEM and engineering applications.

Hexagonal Standoffs

Available In:

Height: 1/8 in. - 1/2 in.
Length: 0.075 in. - 0.230 in.

Hexagonal Standoffs are threaded spacers with a six-sided shape, designed to provide secure separation and support between components in an assembly. The hex shape allows for easy tightening with a wrench or pliers, making installation and adjustment simple and efficient. Commonly used in electronics, enclosures, and mechanical assemblies, hex standoffs help maintain precise spacing while offering structural support. SDP/SI offers hexagonal standoffs in a range of lengths, thread sizes, and materials to meet the demands of OEM and engineering applications requiring durability, alignment, and ease of assembly.

Synchro Mounting Clamps

Available In:

Material: Stainless Steel, Aluminum
Bore Size: 0.020 in. - 0.247 in.
Width: 0.038 in. - 0.272 in.

Synchro Mounting Clamps are specialized components used to securely mount synchros—electromechanical devices that transmit angular position—in instrumentation and control systems. These clamps ensure precise alignment and stable positioning, which is essential for accurate signal transmission and system reliability. SDP/SI offers synchro mounting clamps designed for easy installation and dependable performance, with options to accommodate a variety of synchro sizes. Ideal for aerospace, defense, and industrial applications, these clamps provide a firm, vibration-resistant hold that maintains synchro alignment in demanding environments.

Threaded Rods

Available In:

Material: Aluminum, Brass, Stainless Steel, Steel
**Priced Per 3 ft Rod

Threaded Rods are long, fully threaded fasteners used to join or stabilize components in a wide range of structural, mechanical, and OEM applications. Also known as all-thread or studding, they provide strong, adjustable connections and can be easily cut to length for custom assemblies. SDP/SI offers threaded rods in various materials, diameters, and thread pitches to suit different load requirements and environmental conditions. Whether used for mounting, bracing, or extending connections, our threaded rods deliver versatility, strength, and reliability in demanding engineering environments.

Thumb Screws & Knobs

Available In:

Material: Acetal, Brass, Nylon
Screw Size: #4-40 - #10-32
Head Diameter: 5/16 in. (9.6mm) - 2 in. (45mm)
Screw Length: 1/4 in. - 1 1/2 in.

Thumb Screws and Knobs from SDP/SI offer a practical, easy-to-use fastening solution for applications where quick adjustments or frequent access are required. Designed for hand tightening without the need for tools, they are ideal for securing panels, covers, and components in a wide range of assemblies. Available in various styles, materials, and thread sizes, SDP/SI’s selection combines functionality with user comfort, providing reliable grip and repeatable performance in both temporary and permanent installations.

Torsion Springs

Available In:

Wire Diameter: 0.012 in. (0.3mm) - 0.063 in. (1.6mm)
Outer Diameter: 0.166 in. (4.24mm) - 1.000 in. (19.48mm)
Torque: 0.04 in. (0.5mm) - 5.15 in. (58.0mm)

Torsion Springs are helical springs that exert rotational force, or torque, when twisted. Designed to store and release angular energy, they are commonly used in applications such as hinges, levers, counterbalances, and rotary mechanisms. SDP/SI offers torsion springs in a variety of sizes, materials, and leg configurations to meet a wide range of motion and load requirements. Engineered for durability and consistent performance, these springs provide precise control over angular movement and are suitable for both simple and complex mechanical systems.

Washers

Available In:

Materials: Stainless Steel, Steel, Bronze, Nylon, PVC Copper
Inner Diameter: 0.062 in. (2.1mm) - 2.502 in. (25.0mm)
Outer Diameter: 0.156 in. (4.4mm) - 3.250 in. (44.0mm)

Washers are flat, circular components with a central hole, designed to be used with threaded fasteners to distribute load, prevent surface damage, and, in some cases, absorb vibration. Manufactured from materials such as stainless steel, bronze, nylon, and copper, washers help improve the longevity and stability of mechanical assemblies. SDP/SI offers a wide variety of washer types including flat, thrust, lock, Belleville spring-type, curved, wave-type, and molded shoulder washers. In addition to their primary function, many washers can also serve as spacers, helping to maintain precise clearances between components.