| TABLE I. STANDARD THREADS - from "Machinery's
Handbook", 21st Ed. American or
Unified National |
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| Coarse
and Fine (UNC, UNF), US Pipe (USP).
British Standard Whitworth, Fine, Pipe or Association (BSW, |
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| BSF,
BSP, BA). Metric: French Standard,
Fine Thread and International Standard (ISO) |
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| BSW,
BSF, BSP BA and French Standard Metric is found in T Series cars (late TDs
& TFs use UNF on the rear |
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| axle
and for wheel studs). Whitworth (W) or
BSF marked wrenches fit all fasteners except UNF on T Series cars. |
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| SIZE |
Dia. |
UNC |
BSW |
UNF |
BSF |
BA |
French Std. |
Fine metric |
ISO Metric |
|
| |
(In.) |
TPI |
TPI |
TPI |
TPI |
TPI |
mm |
TPI |
mm |
TPI |
mm |
TPI |
mm |
|
| #2 |
0.0860 |
56 |
|
64 |
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| 8BA |
0.0866 |
|
59.1 |
0.43 |
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| 6BA |
0.1102 |
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47.8 |
0.53 |
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| #4 |
0.1120 |
40 |
|
48 |
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| 3mm |
0.1181 |
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50.8 |
0.50 |
72.5 |
0.35 |
50.8 |
0.50 |
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| #5 |
0.1250 |
40 |
|
44 |
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| 1/8 |
0.1250 |
40 |
40 |
* |
* |
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| 5BA |
0.1260 |
|
43.0 |
0.59 |
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| 3.5mm |
0.1378 |
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* |
* |
72.5 |
0.35 |
42.3 |
0.60 |
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| #6 |
0.1380 |
32 |
|
40 |
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| 4BA |
0.1417 |
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38.5 |
0.66 |
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| 5/32 |
0.1563 |
* |
32 |
* |
* |
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| 4mm |
0.1575 |
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33.9 |
0.75 |
50.8 |
0.50 |
36.3 |
0.70 |
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| 3BA |
0.1614 |
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34.8 |
0.73 |
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| #8 |
0.1640 |
32 |
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36 |
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| 2BA |
0.1850 |
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31.4 |
0.81 |
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| 3/16 |
0.1875 |
24 |
24 |
32 |
32 |
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| #10 |
0.1900 |
24 |
|
32 |
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| 5mm |
0.1968 |
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33.9 |
0.75 |
50.8 |
0.50 |
31.8 |
0.80 |
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| 1BA |
0.2090 |
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28.2 |
0.93 |
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| #12 |
0.2160 |
24 |
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28 |
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| 7/32 |
0.2188 |
* |
* |
* |
28 |
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| 6mm |
0.2362 |
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25.4 |
1.0 |
33.9 |
0.75 |
25.4 |
1.0 |
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| 0BA |
0.2362 |
|
25.4 |
1.00 |
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| #14 |
0.2420 |
24 |
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* |
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| 1/4 |
0.2500 |
20 |
20 |
28 |
26 |
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| 5/16 |
0.3125 |
18 |
18 |
24 |
22 |
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| 8mm |
0.3150 |
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25.4 |
1.0 |
25.4 |
1.0 |
20.4 |
1.25 |
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| 3/8 |
0.3750 |
16 |
16 |
24 |
20 |
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| 1/8 BSP |
0.3830 |
|
28 Straight thread |
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| 1/8 USP |
0.3970 |
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27 Straight thread |
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| 10mm |
0.3937 |
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16.9 |
1.5 |
25.4 |
1.0 |
16.9 |
1.5 |
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| 7/16 |
0.4375 |
14 |
14 |
20 |
18 |
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| 12mm |
0.4725 |
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16.9 |
1.5 |
16.9 |
1.5 |
14.5 |
1.75 |
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| 1/2 |
0.5000 |
13 |
12 |
20 |
16 |
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| 1/4 BSP |
0.5180 |
|
19 Straight thread |
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| 1/4 USP |
0.5260 |
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18 Straight thread |
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| 14mm |
0.5515 |
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12.7 |
2.0 |
16.9 |
1.5 |
12.7 |
2.0 |
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| 9/16 |
0.5625 |
12 |
12 |
18 |
16 |
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| 5/8 |
0.6250 |
11 |
11 |
18 |
14 |
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| 3/8 BSP |
0.6560 |
|
19 Straight thread |
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| 3/8 USP |
0.6620 |
|
18 Straight thread |
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| 1/2 BSP |
0.8250 |
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14 Straight thread |
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| 1/2 USP |
0.8230 |
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14 Straight thread |
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