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TM 9-254
3-1.
Tapered Pins and Tapered Holes - Continued
Table 3-1. Tapered Pins and Drill Sizes
Reamer and pin number
Length
of
pin
(in.)
6/0
5/0
4/0
3/0
2/0
0
1
2
3
4
5
3/8
50
44
38
32
29
1/2
51
45
39
33
30
27
5/8
52
46
41
34
30
27
21
3/4
1/16
47
42
7/64
1/8
9/64
5/32
16
13/64
15/64
1
1
49
44
37
31
29
25
11/64
9
1
H
1-1/4
32
30
26
19
10
2
G
1-1/2
1/8
9/64
20
3/16
7/32
F
1-3/4
31
29
5/32
14
3
E
2
33
30
25
16
4
D
2-1/4
7/64
1/8
26
11/64
13/64
C
2-1/2
37
31
28
19
8
B
2-3/4
40
33
29
21
11
1
3
42
35
30
5/32
3/16
2
3-1/4
24
14
2
3/1-2
26
16
3
3-3/4
17
4
4
19
5
d.
Precautions Before Installing Pin. Before securing two parts with a tapered pin, always check the direction of
the taper. Slip the pin loosely in the hole from either side. It should be driven into the side in which it enters most deeply.
When securing two parts which have been previously drilled and reamed for a tapered pin, such as a wormshaft and knob,
check the direction of the taper in both parts and assemble accordingly. The parts should have been marked during
disassembly to insure that they are assembled in the same position. Failure to follow the practice of checking the direction
of taper in the parts may cause damage to the parts when the pin is driven in and possibly make the instrument
unserviceable
3-2
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