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 Straight Sided
Serrations

BRITISH STRAIGHT SIDED SERRATIONS STANDARD
# of Serr.S Norm. Size 0 P1 P2 C C-S R Hole Shaft   Resultants Fits
Fit 1 inter-
clear- ance
A-A1		 Fit 2 Tran-
sition

A-A2		 Fit 3 Clear-
ance

A-A3
D1 D A D2 D3 A1 A2 A3
12 1/4 60 0.2780 0.1966 0.0172 0.2064 0.009 0.268 0.2114 0.1390 0.248 0.199 0.1405 0.1393 0.1381 -1.5 -0.3 0.9
12 1/4 60 0.2780 0.1966 0.0172 0.2064 0.006 0.268 0.2126 0.1399 0.247 0.199 0.1399 0.1384 0.1384 0 1.5 3.0
12 5/16 60 0.3476 0.2458 0.0214 0.2568 0.012 0.335 0.2649 0.1738 0.310 0.249 0.1753 0.1741 0.1741 -1.5 -0.3 0.9
12 5/16 60 0.3476 0.2458 0.0214 0.2568 0.007 0.335 0.2661 0.1747 0.309 0.249 0.1747 0.1732 0.1732 0 1.5 3.0
16 3/8 67- 1/2 0.9374 0.3123 0.0216 0.3456 0.006 0.389 0.3287 0.2217 0.372 0.314 0.2217 0.2202 0.2187 0 1.5 3.0
16 7/16 67- 1/2 0.4637 0.3643 0.0252 0.4032 0.011 0.456 0.382 0.2576 0.435 0.366 0.2591 0.2579 0.2567 -1.5 -0.3 0.9
16 7/16 67- 1/2 0.4637 0.3643 0.0252 0.4032 0.006 0.456 0.3836 0.2585 0.434 0.366 0.2585 0.257 0.2555 0 1.5 3.0
16 1/2 67- 1/2 0.5299 0.4163 0.0300 0.4800 0.012 0.520 0.4354 0.2944 0.498 0.419 0.2959 0.2947 0.2935 -1.5 -0.4 1.2
16 1/2 67- 1/2 0.5299 0.4163 0.0300 0.4800 0.007 0.520 0.437 0.2953 0.497 0.419 0.2953 0.2938 0.2923 0 2.0 4.0
20 5/8 72 0.6489 0.5394 0.0313 0.6260 0.011 0.643 0.5578 0.3814 0.540 0.523 0.3834 0.3818 0.3802 -2.0 -0.4 1.2
20 5/8 72 0.6489 0.5394 0.0313 0.6260 0.006 0.643 0.5594 0.3826 0.540 0.522 0.3826 0.3806 0.3786 0 2.0 4.0
20 3/4 72 0.7787 0.6473 0.0378 0.7560 0.013 0.769 0.6685 0.4577 0.748 0.65 0.4597 0.4581 0.4665 -2.0 -0.4 1.2
20 3/4 72 0.7787 0.6473 0.0378 0.7560 0.008 0.769 0.6705 0.4589 0.746 0.65 0.4589 0.4569 0.4649 0 2.0 4.0
20 7/8 72 0.9085 0.7552 0.0449 0.8980 0.015 0.896 0.7792 0.534 0.873 0.76 0.536 0.5344 0.5328 -2.0 -0.4 1.2
20 7/8 72 0.9085 0.7552 0.0449 0.8980 0.010 0.896 0.7812 0.5352 0.871 0.76 0.5332 0.5332 0.5312 0 2.0 4.0
24 1 75 1.0277 0.8847 0.0437 1.0488 0.013 1.020 0.9066 0.6256 0.998 0.886 0.6281 0.6261 0.6241 -2.5 -0.5 1.5
24 1 75 1.0277 0.8847 0.0437 1.0488 0.008 1.020 0.9086 0.6271 0.996 0.896 0.6271 0.6246 0.6221 0 2.5 5.0
24 1-1/8 75 1.1561 0.9953 0.0492 1.1808 0.015 1.146 1.0201 0.7038 1.123 0.999 0.7063 0.7043 0.7023 -2.5 -0.5 1.5
24 1-1/8  75 1.1561 0.9953 0.0492 1.1808 0.010 1.146 1.0225 0.7053 1.121 0.999 0.7053 0.7043 0.7003 0 2.5 5.0
24 1-1/4 75 1.2846 1.1059 0.0550 1.3200 0.017 1.272 1.1335 0.782 1.248 1.111 0.7845 0.7825 0.7805 -2.5 -0.5 1.5
24 1-1/4  75 1.2846 1.1059 0.0550 1.3200 0.012 1.272 1.1359 0.7835 1.246 1.111 0.7835 0.781 0.7785 0 2.5 5.0
24 1-3/8 75 1.4130 1.2165 0.0616 1.4784 0.018 1.399 1.2455 0.8602 1.373 1.222 0.8627 0.8607 0.8587 -2.5 -0.5 1.5
24 1-3/8 75 1.4130 1.2165 0.0616 1.4784 0.018 1.399 1.2479 0.8617 1.371 1.222 0.8617 0.8592 0.8567 0 2.5 5.0
24 1-1/2 75 1.5415 1.3271 0.0674 1.6176 0.020 1.525 1.3589 0.9384 1.498 1.335 0.9409 0.9389 0.9369 -2.5 -0.5 1.5
24 1-1/2 75 1.5415 1.3271 0.0674 1.6176 0.015 1.525 1.3613 1.9399 1.496 1.335 0.9399 0.9374 0.9349 0 2.5 5.0
36 1-5/8 80 1.6503 1.5002 0.0470 1.6920 0.014 1.643 1.5242 1.0608 1.523 1.502 1.0638 1.0614 1.0590 -3.0 -0.6 1.8
36 1-5/8 80 1.6503 1.5002 0.0470 1.6920 0.009 1.643 1.527 1.0626 1.521 1.502 1.0626 1.0596 1.0566 0 3.0 6.0
36 1-3/4 80 1.7773 1.6156 0.0511 1.8396 0.015 1.769 1.641 1.1424 1.748 1.618 1.1454 1.143 1.1406 -3.0 -0.6 1.8
36 1-3/4  80 1.7773 1.6156 0.0511 1.8396 0.010 1.769 1.6438 1.1442 1.746 1.618 1.1442 1.1412 1.1382 0 3.0 6.0
36 1- 7/8 80 1.9044 1.7311 0.0551 1.9836 0.016 1.895 1.758 1.2241 1.873 1.743 1.2271 1.2247 1.2223 -3.0 -0.6 1.8
36 1-7/8 80 1.9044 1.7311 0.0551 1.9836 0.011 1.895 1.7608 1.2259 1.871 1.743 1.2259 1.2229 1.2199 0 3.0 6.0
36 2 80 2.0313 1.8465 0.0592 2.1312 0.017 2.021 1.8748 1.3057 1.998 1.851 1.3087 1.3063 1.3039 -3.0 -0.6 1.8
36 2 80 2.0313 1.8465 0.0592 2.1312 0.012 2.021 1.8776 1.3075 1.996 1.851 1.3075 1.3045 1.3015 0 3.0 6.0
36 2 80 2.2852 2.0773 0.0672 2.4192 0.019 2.272 2.1084 1.4689 2.248 2.083 1.4719 1.4695 1.4671 -3.0 -0.6 1.8
36 2 80 2.2852 2.0773 0.0672 2.4192 0.014 2.272 2.1116 1.4707 2.246 2.083 1.4707 1.4677 1.4647 0 3.0 6.0
36 2-1/4 80 2.2852 2.3081 0.075 2.700 0.021 2.525 2.3428 1.6321 2.498 2.314 1.6356 1.6328 1.6300 -3.5 -0.7 2.1
36 2-1/4 80 2.2852 2.3081 0.075 2.700 0.016 2.525 2.346 1.6342 2.496 2.314 1.6342 1.6307 1.6272 0 3.5 7.0
40 2-3/4 81 2.7885 2.5611 0.0735 2.940 0.022 2.773 2.5972 1.811 2.748 2.568 1.8145 1.8117 1.8089 -3.5 -0.7 2.1
40 2-3/4 81 2.7885 2.5611 0.0735 2.940 0.017 2.773 2.6004 1.8131 2.746 2.568 1.8131 1.8096 1.8061 0 3.5 7.0
40 3 81 3.0420 2.7939 0.0798 3.192 0.024 3.025 2.8328 1.9756 2.998 2.803 1.9791 1.9763 1.9735 -3.5 -0.7 2.1
40 3 81 3.0420 2.7939 0.0798 3.192 0.019 3.025 2.8364 1.9777 2.996 2.903 1.9777 1.9742 1.9707 0 3.5 7.0
48 3-1/4 82- 1/2 3.2893 3.0671 0.0686 3.2928 0.023 3.274 3.1053 2.1688 2.248 3.074 2.1728 2.1696 2.1664 -3.5 -0.8 2.4
48 3- 1/4 82- 1/2 3.2893 3.0671 0.0686 3.2928 0.018 3.274 3.1089 2.1712 2.246 3.074 2.1712 2.1672 2.1632 0 4.0 8.0
48 3-1/2 82- 1/2 3.5424 3.3032 0.0741 3.5568 0.025 3.525 3.3442 2.3357 3.498 3.312 2.3397 2.3365 2.3333 -4.0 -0.8 2.4
48 3-1/2 82- 1/2 3.5424 3.3032 0.0741 3.5568 0.020 3.525 3.3478 2.3381 3.496 3.312 2.3381 2.3341 2.3301 0 4.0 8.0
48 3-3/4 82- 1/2 3.4954 3.6391 0.0804 3.8592 0.026 3.777 3.5815 2.5025 3.479 3.548 2.5065 2.5033 2.5001 -4.0 -0.8 2.4
48 3-3/4 82- 1/2 3.7954 3.6391 0.0804 3.8592 0.021 3.777 3.5851 2.5049 3.476 3.548 2.5049 2.5009 2.4969 0 4.0 8.0
48 4 82- 1/2 4.0484 3.7750 0.0859 4.1232 0.028 4.028 3.8202 2.6693 3.998 3.786 2.6733 2.6701 2.6669 -4.0 -0.8 2.4
48 4 82- 1/2 4.0484 3.7750 0.0859 4.1232 0.023 4.028 3.8242 2.6717 3.996 3.786 2.6717 2.6677 2.6637 0 4.0 8.0
48 4-1/4 82- 1/2 4.3015 4.0110 0.0911 4.3728 0.030 4.280 4.0598 2.8362 4.248 4.023 2.8407 2.8371 2.8371 -4.5 -0.9 2.7
48 4-1/4 82- 1/2 4.3015 4.0110 0.0911 4.3728 0.025 4.280 4.0638 2.8389 4.246 4.023 2.8389 2.8344 2.8344 0 4.5 9.0