(Part B) Machinerys Handbook 31st Edition Pages 1484-2979

Table 1. British Standard Whitworth (BSW) and Fine (BSF) Precision Hexagon Slotted and Castle Nuts BS 1083:1965 (obsolescent)

Bolts, Screws, and Nuts

Bolts and Screws

Nuts

Width

Thickness

Thickness

Diameter of Unthreaded Portion of Shank B

Number of Threads per Inch

Diameter of Washer Face G

Radius Under Head R

Across Flats A

Across Corners C

Head F

Ordinary E

Lock H

Nominal Size D

BSW

BSF

Max.

Min. a

Max. 0.51 0.61 0.69 0.82 0.95 1.06 1.17 1.39 1.50 1.71 1.93 2.15 2.37 2.56 2.98 3.19

Max.

Min.

Max.

Min.

Max.

Min.

Max.

Min.

Max.

Min.

Max.

Min.

20 18 16 14 12 12 11 10

26 22 20 18 16 16 14 12 11 10

0.445 0.438 0.525 0.518 0.600 0.592 0.710 0.702 0.820 0.812 0.920 0.912 1.010 1.000 1.200 1.190 1.300 1.288 1.480 1.468 1.670 1.640 1.860 1.815 2.050 2.005 2.220 2.175 2.580 2.520 2.760 2.700

0.428 0.418 0.025 0.015 0.2500 0.508 0.498 0.025 0.015 0.3125 0.582 0.572 0.025 0.015 0.3750 0.690 0.680 0.025 0.015 0.4375 0.800 0.790 0.025 0.015 0.5000 0.900 0.890 0.045 0.020 0.5625 0.985 0.975 0.045 0.020 0.6250 1.175 1.165 0.045 0.020 0.7500 1.273 1.263 0.065 0.040 0.8750 1.453 1.443 0.095 0.060 1.0000 1.620 1.610 0.095 0.060 1.1250 1.795 1.785 0.095 0.060 1.2500 1.985 1.975 0.095 0.060 1.3750 2.155 2.145 0.095 0.060 1.5000 2.495 2.485 0.095 0.060 1.7500 2.675 2.665 0.095 0.060 2.0000

0.2465 0.176 0.166 0.200 0.190 0.185 0.180 0.3090 0.218 0.208 0.250 0.240 0.210 0.200 0.3715 0.260 0.250 0.312 0.302 0.260 0.250 0.4335 0.302 0.292 0.375 0.365 0.275 0.265 0.4960 0.343 0.333 0.437 0.427 0.300 0.290 0.5585 0.375 0.365 0.500 0.490 0.333 0.323 0.6190 0.417 0.407 0.562 0.552 0.375 0.365 0.7440 0.500 0.480 0.687 0.677 0.458 0.448 0.8670 0.583 0.563 0.750 0.740 0.500 0.490 0.9920 0.666 0.636 0.875 0.865 0.583 0.573 1.1170 0.750 0.710 1.000 0.990 0.666 0.656 1.2420 0.830 0.790 1.125 1.105 0.750 0.730 1.3650 0.920 0.880 1.250 1.230 0.833 0.813 1.4900 1.000 0.960 1.375 1.355 0.916 0.896 1.7400 1.170 1.110 1.625 1.605 1.083 1.063 1.9900 1.330 1.270 1.750 1.730 1.166 1.146

1 ∕ 4

5 ∕ 16

3 ∕ 8

7 ∕ 16

1 ∕ 2

9 ∕ 16

5 ∕ 8 3 ∕ 4 7 ∕ 8

9 8 7 7

1

9 9

1 1 ∕ 8 1 1 ∕ 4

… 8

1 3 ∕ 8 b

6 5

8 7 7

1 1 ∕ 2 1 3 ∕ 4

2

4.5

a When bolts from 1 ⁄

4 to 1 inch are hot forged, the tolerance on the width across flats shall be two and a half times the tolerance shown in the table and shall be

unilaterally minus from maximum size. For dimensional notation, see diagram on page 1759. b Noted standard with BSW thread. All dimensions in inches except where otherwise noted.

Made with FlippingBook - Share PDF online