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2. Miniature roller chains -- These chains are designed especially for use where space is limited, or where light weight is an important factor. The high strength-to-weight ratio, durability, and extreme dimensional accuracy make this chain ideal for positive power transmission or shaft synchronization where precision and compactness are important. Examples are: communications equipment, business machines, cameras, and other electronic or electro-mechanical devices. For chain speeds not exceeding 100 feet per minute, maximum load on chain should be no more than 20 pounds. For higher chain speeds, maximum chain loading should be reduced depending on the operating conditions:
length of service required, sprocket size, number of sprockets in the drive, chain speed, and the length of chain.
   For sprockets with 20 teeth, or less, speeds should not exceed 15,000 R.P.M. Larger sprockets should be limited to reduce speeds. For example, the speed of 60 tooth sprockets should not exceed 6,000 R.P.M.
   Lubrication is desirable where high loads, speeds and service life are required. Miniature chain is available from stock and listed in the Product Section of the SDP catalog.

(b) Ladder Chain
Ladder chain links are fabricated from wire which has been formed so that each link interlocks with its adjacent links to form a continuous chain whose drive members appear as rungs on a ladder. Hence the name; Ladder Chain. Ladder Chain is inexpensive and easy to install. It finds wide use in household appliances, recorders, vending machines and in various timing and electrical devices. Ladder Chains are flexible enough so that in a 2 sprocket drive, one of the sprockets can be rotated well over 90 degrees with respect to the other sprocket plane provided of course that sufficient center distance is allowed. Thus offering a decided advantage over roller chain and timing belts in this regard. Ladder Chains are assembled manually by spreading the connecting loops on the end link slightly apart with a pair of needle nosed pliers, and retightening the loops after engaging the link from the other end of the chain.
   Table 16 indicates the approximate H.P. ratings of the various chain sizes and material combinations listed in the SDP product catalog.

(C) Bead Chain
Bead Chain consists of a series of hollow metal beads, linked together by dumbbell shaped wire links. Since the beads are free-to swivel, the chain can be easily-twisted, thus making it extremely versatile for unusual drives. Bead chain because of its construction should only be considered on a low speed or manual drives With low torque requirements.

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