| TABLE 7 | TORSIONAL HOLDING POWER (IN- LBS ) FOR CUP-POINT SETSCREWS |
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Pins
Pinning is a reliable and positive fastening method. The pin can be designed to shear under overload conditions. Straight pins require precision because of their interference fit, whereas tapered pins avoid reaming to critical diameter dimensions. The strain on the shaft caused by a tightly driven taper pin can cause shaft bowing. Roll pins and Spirol pins present an economical solution.
The allowable shearing force and torque is given in the following table. It has to be noted that if recommended shaft size is used the shaft strength will be the limiting factor rather than the pin.
| TABLE 8 SHEAR STRENGTHS FOR SOLID PINS |
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This table is calculated based on C1212 and S.S. 18-8 shearing strength of 65,000 psi, and 90,000 psi, respectively.
*Shear torque values should be divided by a safety factor of 8 to yield recommended working torques.
T27
