Pin Standards   

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      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 diametordimensions. The strain on the shaftcaused byatightly driven taper pin can cause shaft bowing. Roll pins and Spiral 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.

SHEAR STRENGThS FOR SOLID PINS

Straight Pin Diameter Cross
Section
Area
sq. in.		 Double
Shear
Area
sq.in.		 Double Shear
Strength
lb.		 *Shear Torque
lb. -in.		 Tapper
Pin
Equivalent		 Recommended
Shaft
Size
C1212 S.S18-8 C1212 S.S18-8
.031
.047
.062
.078
.093
.109
.125		 .0008
.0017
.0031
.0048
.0069
.0094
.0123		 .0016
.0034
.0062
.0096
.0138
.0188
.0246		 104
220
402
624
896
1222
1600		 144
306
558
864
1242
1692
2214		 4
15.2
37.6
68
112
190.4
299.2		 5.5
21
52
94
155
263
413		 9/0
8/0
7/0
6/0
5/0
4/0
3/0		 .093
.141
.183
.219
.250
.312
.375

This table is calculated 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.


ROLL PIN HOLE TOLERANCES
AND SHEAR STRENGTHS

Hole
Diameter		 Recommended
Hole Size		 Minimum Double
Shear Strength lb.
Carbon Steel and
Stainless Steel
Nominal Minimum Maximum
.062
.094
.125
.156
.187		 .062
.094
.125
.156
.187		 .065
.097
.129
.160
.192		 425
1000
2100
3000
4400

T84