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MARYLAND METRICS
THREAD DATA CHARTS

BRITISH STANDARD CYCLE THREAD (BSC)


Size Threads per inch Outside Dia. Core Dia. Pitch Depth Radius Tapping drill Clearance drill
    inch inch inch inch inch mm mm
        p   r    
16 56 RH 0.0735 0.0545 0.0179 0.0095 0.0030 1.5 mm 2 mm
15 56 RH 0.0825 0.0635 0.0179 0.0095 0.0030 1.7 mm 2.2 mm
14 56 RH 0.0905 0.0715 0.0179 0.0095 0.0030 1.9 mm 2.4 mm
13 56 RH 0.1025 0.0835 0.0179 0.0095 0.0030 2.2 mm 2.7 mm
12 56 RH 0.1145 0.0955 0.0179 0.0095 0.0030 2.55 mm 3 mm
1/8" 40 RH 0.1250 0.0984 0.0250 0.0133 0.0041 2.65 mm 3.4 mm
11 44 RH 0.1291 0.1049 0.0227 0.0121 0.0038 2.8 mm 3.5 mm
10 40 RH 0.1423 0.1157 0.0260 0.0133 0.0041 3.1 mm 3.8 mm
5/32" 32 RH 0.1563 0.1231 0.0312 0.0166 0.0052 3.4 mm 4.2 mm
9 40 RH 0.1583 0.1317 0.0250 0.0133 0.0041 3.5 mm 4.3 mm
8 32 RH 0.1776 0.1444 0.0312 0.0168 0.0052 3.9 mm 4.7 mm
3/16" 32 RH 0.1875 0.1543 0.0312 0.0166 0.0052 4.1 mm 5.0 mm
7/32" 26 RH 0.2188 0.1778 0.0385 0.0205 0.0064 4.8 mm 5.8 mm
1/4" 26 RH 0.2500 0.2090 0.0385 0.0205 0.0064 5.5 mm 6.6 mm
17/64" 26 RH 0.2656 0.2246 0.0385 0.0205 0.0064 5.0 mm 7.0 mm
9/32" 26 RH 0.2813 0.2403 0.0385 0.0205 0.0064 6.4 mm 7.4 mm
5/16" 26 RH 0.3125 0.2715 0.0385 0.0205 0.0064 7.2 mm 8.3 mm
3/8" 26 RH 0.3750 0.3340 0.0385 0.0205 0.0064 8.8 mm 9.9 mm
7/16" 26 RH 0.4375 0.3965 0.0385 0.0205 0.0064 10.4 mm 11.5 mm
7/16" 20 RH 0.4375 0.3843 0.5000 0.0266 0.0083 10.3 mm 11.5 mm
1/2" 26 RH 0.5000 0.4590 0.0385 0.0205 0.0064 12.0 mm 33/64"
1/2" 20 RH 0.5000 0.4590 0.0500 0.0266 0.0083 11.9 mm 33/64"
9/16" 26 RH 0.5625 0.5215 0.0385 0.0205 0.0064 13.5 mm 37/64"
9/16" 20 RH 0.5625 0.5093 0.0500 0.0266 0.0083 13.4 mm 37/64"
5/8" 26 RH 0.6250 0.5840 0.0385 0.0205 0.0064 15.0 mm 41/64"
5/8" 20 RH 0.6250 0.5719 0.0500 0.0266 0.0083 14.75 mm 41/64"
11/16" 26 RH 0.6875 0.6465 0.0385 0.0205 0.0064 21/32" 18 mm
11/16" 20 RH 0.6875 0.6343 0.0500 0.0266 0.0083 16.5 mm 18 mm
3/4" 26 RH 0.7500 0.7090 0.0385 0.0205 0.0064 23/32" 19.5 mm
3/4" 20 RH 0.7500 0.6968 0.0500 0.0266 0.0083 18.0 mm 19.5 mm
7/8" 24 RH 0.8750 0.8306 0.0417 0.0222 0.0070 21.5 mm 23 mm
31/32" 30 RH 0.9688 0.9332 0.0333 0.0178 0.0066 24 mm 25 mm
1" 24 RH 1.0000 0.9556 0.0417 0.0222 0.0070 31/32" 26 mm
1 1/8" 26 RH 1.1250 1.0840 0.0385 0.0205 0.0064 1 3/32" 29 mm
1.29" 24 LH 1.2900 1.2456 0.0417 0.0222 0.0070 32 mm 1 5/16"
1.37" 24 RH 1.3700 1.3256 0.0417 0.0222 0.0070 34 mm 35.5 mm
1.37" 24 LH 1.3700 1.3256 0.0417 0.0222 0.0070 34 mm 35.5 mm
1.45" 26 RH 1.4500 1.4090 0.0385 0.0205 0.0064 1 27/64" 37.5 mm
1.45" 26 LH 1.4500 1.4090 0.0385 0.0205 0.0064 1 27/64" 37.5 mm
1 9/16" 24 LH 1.5620 1.5181 0.0417 0.0222 0.0070 1 17/32" 1 19/32"
1 5/8" 24 RH 1.6250 1.5805 0.0417 0.0222 0.0070 40.5 mm 42 mm
Notes: RH = Right Hand     LH = Left Hand     r = p x 0.1666     D = p x 0.5327


IMPERIAL WIRE GAUGE (IWG)
spoke thread data

No picture currently available
Size Threads per inch Outside Dia. Core Dia. Pitch Depth Radius Tapping drill
    inch inch inch inch inch
        p   r  
17 IWG 62 0.056 0.0388 0.01613 0.0086 0.002687 No 61
16 IWG 62 0.064 0.0468 0.01613 0.0086 0.002687 3/64"
15 IWG 62 0.072 0.0548 0.01613 0.0086 0.002687 No 54
14 IWG 62 0.08 0.0628 0.01613 0.0086 0.002687 1.60mm
13 IWG 56 0.092 0.073 0.0179 0.0095 0.002982 No 49
12 IWG 44 0.104 0.0798 0.0227 0.0121 0.00378 No 46

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