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Machine Screw
Machine Screw
  • Products Name: Machine Screw
  • High Quality Product
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Products Infomation

Machine Screw Threads
(1) ISO:METRIC COARSE SCREW THREADS
1.1 Range: M1.2 to M8 Coarse machine screw nominal dia. & tolerance.
2. Thread tolerance class 6g
2.1 Inspection: Pass 6g ring gauge during production.
2.2 Acceptance: Pass 6h ring gauge after surface treatment.

ISO COARSE SCREW

Nominal size (P) d(major diameter) d2(pitch diameter)
Pitch (max) (min) (max) (min)
M1.2 0.25 1.200 1.133 1.038 0.985
M1.4 0.30 1.400 1.325 1.205 1.149
M1.6 0.35 1.581 1.496 1.354 1.291
M1.7 0.35 1.680 1.610 1.453 1.393
M2.0 0.40 1.981 1.866 1.751 1.654
M2.5 0.45 2.480 2.380 2.188 2.117
M3.0 0.50 2.980 2.874 2.655 2.580
M3.5 0.60 3.479 3.354 3.089 3.004
M4.0 0.70 3.978 3.838 3.523 3.433
M5.0 0.80 4.976 4.826 4.456 4.361
M6.0 1.00 5.974 5.974 5.324 5.212
M8.0 1.25 7.972 7.760 7.160 7.042

BS: BSW COARSE SCREW THREADS
1. Range: BSW from 1/16" to 9/16"
2. Tolerance class: 2A

BSW UNIFIED COARSE SCREW

Nominal size major diameter
(max) (min)
1/16 60 1.560 1.470
3/32 48 2.361 2.155
1/8 40 3.155 3.045
5/32 32 3.945 3.795
3/16 24 4.472 4.592
1/4 20 6.330 6.610
5/16 18 7.910 7.720
3/8 16 9.500 9.310
7/16 14 11.082 10.892
1/2 12 12.670 12.460
9/16 12 14.288 14.047

(3) ANSI: UNIFIED COARSE SCREW THREADS
1. Size range: ANSI No. 1-64 UNC to 1/2"-13 UNC
2. Tolerance class: 2A

BSW UNIFIED COARSE SCREW

Nominal size major diameter d2 major diameter
(max) (min) (max) (min)
NO.1 64 1.838 1.743 1.582 1.532
NO.2 56 2.168 2.066 1.874 1.822
NO.3 48 2.496 2.383 2.153 2.096
NO.4 40 2.824 2.695 2.413 2.350
NO.5 40 3.154 3.026 2.743 2.678
NO.6 32 3.484 3.333 2.969 2.899
NO.8 32 4.142 3.991 3.672 3.544
NO.10 24 4.800 4.618 4.112 4.029
NO.12 24 5.461 5.279 4.772 4.687
1/4 20 6.322 6.177 5.496 5.403
5/16 18 7.907 7.687 6.990 6.889
3/8 16 9.491 9.254 8.460 8.349
7/16 14 11.076 10.816 9.898 9.779
1/2 13 12.661 12.386 11.392 11.265

(4) ANSI: UNIFIED FINE SCREW THREADS
1. Size range: ANSI No. 2-64 UNC to 1/2"-20 UNC
2. Tolerance class: 2A
Nominal size major diameter d2 major diameter
(max) (min) (max) (min)
NO.2 64 2.169 2.073 1.912 1.862
NO.3 56 2.496 2.393 2.202 2.147
NO.4 48 2.827 2.713 2.484 2.424
NO.5 44 3.157 3.036 2.781 2.718
NO.6 40 3.484 3.356 3.073 3.008
NO.8 36 4.145 4.006 3.688 3.617
NO.10 32 4.803 4.651 4.287 4.212
NO.12 28 5.461 5.296 4.871 4.791
1/4 28 6.324 6.160 5.735 5.652
5/16 24 7.909 7.727 7.221 7.128
3/8 24 9.497 9.315 8.808 8.713
7/16 20 11.079 10.874 10.254 10.147
1/2 20 12.668 11.841 11.841 11.732

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