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SPIROL PIN HOLE TOLERANCE
AND SHEAR STRENGTHS

Nominal
Diameter		 Decimal
Diminution		 Recommended
Drilled Hole
Tolerance		 Minimum
Double
Shear
lb. in.
Plus Minus
1/32
1/16
3/32
1/8
5/32
3/16		 .031
.062
.094
.125
.156
.187		 .001 .000 75
300
700
1250
1925
2800
.003
    		.001
.004
   
.005 .002

GROOVE PIN HOLE TOLERANCES

Pin Diameter
in.		 Decimal
Equivalent		 Recommended
Drill Size in.		 Hole Tolerance ADD To Nominal Diameter in.
1/16
5/64		 .0625
.0781		 1/16
5/64		 .002
3/32
7/64
1/8
5/32		 .0938
.1094
.1250
.1563		 3/32
7/64
1/8
5/32		 .003
3/16 .1875 3/16 .004
Tolerances for drilled holes shown m table are based on depth to diameter ratio
of approximately 5 to 1. Higher ratios may cause these figures to be exceeded,
but in no case should they be exceeded by more than 10%. Specifications for holes
having a depth to diameter ratio of 1 to 1 or less should be held extremely dose;
60% of figures shown in table is recommended.

GROOVE PIN TORQUE RATINGS

Shaft
Size		 Pin
Diameter		 Torque
lb. in.
3/16
7/32
1/4
5/16
3/8
7/16
1/2
9/16
5/8
11/6		 1/16
5/64
3/32
7/64
1/8		 4.6
8.4
13.7
23.6
37.2
67.6
77.2
125.0
139.0
207.0
  
5/32
  
3/16
7/32
Shaft
Size		 Pin
Diameter		 Torque
lb. in.
7/8
15/16
1
1-1/16
1-1/8
1-3/16
1-1/4
1-5/16
1-3/8
1-7/16		 1/4 347
580
618
657
1010
1065
1120
1590
1670
1740
  
5/16
    
   
3/8
    
   
7/16
     
This table is a guide in selecting the proper size Driv-Lok Grooved Pin to use in
keying machine members to shafts of given sizes and for specific load
requirements. Torque and horsepower ratings are based on pins made of cold
finished, low carbon steel and a safety factor of 8 is assumed.

T85