Machinery's Handbook, 31st Edition
1036
Collets Collets for Lathes, Mills, Grinders, and Fixtures Collets for Lathes, Mills, Grinders, and Fixtures (Continued)
Dimensions
Max. Capacity (inches)
Collet
Style
Bearing Dia., A
Length, B
Thread, C
Round Hex Square 3.500 3.000 2.438 1.000 0.875 0.719 0.938 0.813 0.656 0.625 0.531 0.438 1.125 0.969 0.797 1.750 1.500 1.219 3.250 2.813 2.250 0.500 0.438 0.344 0.625 0.531 0.438 0.500 0.438 0.344 0.750 0.641 0.516 1.188 1.000 0.813 0.500 0.438 0.344 1.125 0.969 0.781 0.800 0.688 0.563 1.125 0.969 0.781 0.800 0.688 0.563 0.750 0.641 0.531
35J 42S
1 1 1 1 1 1 7 7 7 9 8
3.875 1.250 1.250 0.800 1.344 2.030 3.687 0.650 0.780 0.625 0.999 1.360 0.687 1.250 1.250 1.250 1.250 0.950
5.000 3.688 4.000 3.688 3.500 4.750 5.500 3.031 3.031 2.437 4.375 4.000 2.000 2.938 4.437 4.437 2.938 4.000
3.861 × 18 RH 1.236 × 20 RH 1.125 × 24 RH 0.795 × 20 RH 1.307 × 20 LH 1.990 × 18 LH 3.622 × 16 LH 0.437 × 20 RH 0.500 × 20 RH 0.437 × 20 RH
50V 8
52SC
115 215 315 B3 D5 JC LB RO RO RO RO R8
GTM J&L
None None None
10 11 12 12 11
0.875 × 16 RH 0.875 × 16 RH 0.875 × 16 RH 0.875 × 16 RH 0.437 × 20 RH
7
a Internal stop thread is 1.041 × 24 RH. b Internal stop thread is 1.687 × 20 RH. Dimensions in inches unless otherwise noted. Courtesy of Hardinge Brothers, Inc. Additional dimensions of the R8 collet are given on page 1033 . DIN 6388, Type B, and DIN 6499, ER Type Collets
30
C
A
B
A B
L
L Type B
ER Type
Dimensions
Collet Standard
Type
B (mm)
L (mm)
A (mm) 4.5-16 5.5-20 5.5-25 9.5-32 0.5-5 0.5-7 0.5-10 0.5-13 0.5-16 2-20 3-26 26-30 5-34
C
Type B,
16 20 25 32
25.50 29.80 35.05 43.70 8.50 11.50
40 45 52 60 18 27 31 35 40 46 39 60
… … … … 8 ° 8 ° 8 ° 8 ° 8 ° 8 ° 8 ° 8 ° 8 °
DIN 6388
ERA8 ERA11 ERA16 ERA20 ERA25 ERA32 ERA40 ERA50
13.5
ER Type,
DIN 6499
17 21 26 33 41 41 52
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