Portable Tool Spindles American Standard Square Drives for Portable Air and Electric Tools ASA B5.38-1958 Machinery's Handbook, 31st Edition
1038
E M Diam. Thru Hole
F M Diam. Plunger
D M
B M
R M
Chamfer or Radius Optional
A M
C M
DESIGN A
DESIGN B
Male End
D M
C M
A M
Drive Size
F M Max.
R M Max.
B M Max.
E M Min.
Max.
Min.
Max.
Min.
Max.
Min.
Design.
A 0.252 0.247 0.330 0.312 0.265 0.165 0.153 A 0.377 0.372 0.500 0.438 0.406 0.227 0.215 A 0.502 0.497 0.665 0.625 0.531 0.321 0.309 A 0.627 0.622 0.834 0.656 0.594 0.321 0.309
… … … …
0.078 0.015 0.156 0.031 0.187 0.031 0.187 0.047
1 ⁄ 4 3 ⁄ 8 1 ⁄ 2 5 ⁄ 8 3 ⁄ 4
B 0.752 0.747 1.000 0.938 0.750 0.415 0.403 0.216 B 1.002 0.997 1.340 1.125 1.000 0.602 0.590 0.234 B 1.503 1.498 1.968 1.625 1.562 0.653 0.641 0.310
… … …
0.047 0.063 0.094
1
1 1 ⁄ 2
Chamfer Optional See Note
D F
E F Min.
A F
A F
R F Alternate Corner
B F Min.
B F Min.
Optional Groove Designs 90°
90°
Must Accept C M Max.
Optional C F Min.
DESIGN A
DESIGN B
Female End
D F
A F
Drive Size
R F Max.
B F Min. 0.335 0.505 0.670 0.839 1.005 1.350 1.983
E F Min. 0.090 0.170 0.201 0.201 0.216 0.234 0.310
Max. 0.258 0.383 0.508 0.633 0.758 1.009 1.510
Min. 0.253 0.378 0.503 0.628 0.753 1.004 1.505
Max. 0.159 0.221 0.315 0.315 0.409 0.596 0.647
Min. 0.147 0.209 0.303 0.303 0.397 0.584 0.635
Design
A A A A B B B
… … … …
1 ⁄ 4 3 ⁄ 8 1 ⁄ 2 5 ⁄ 8 3 ⁄ 4
0.047 0.062 0.125
1
1 1 ⁄ 2
All dimensions in inches. Incorporating fillet radius ( R M ) at shoulder of male tang precludes use of minimum diameter cross-hole in socket ( E F ), unless female drive end is chamfered (shown as optional). If female drive end is not chamfered, socket cross-hole diameter ( E F ) is increased to compensate for fillet radius R M , max. Minimum clearance across flats male to female is 0.001 inch through 3 ⁄ 4 -inch size; 0.002 inch in 1- and 1 1 ⁄ 2 -inch sizes. For impact wrenches, A M should be held as close to maximum as practical. C F , min., for both designs A and B should be equal to C M , max.
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