OverallPinBored holeBored hole dia.Bored holeBored holeBored holeShank
lengthlengthdia.(GO)(NOT-GO)depth(1.5D)depth( 2D)depth( 2.5D)dia.
Ld₁d₂ℓ₁ℓ₂ℓ₃Ds
Ld1(inch)d2(inch)Ds
SizeCode123Type Stock
(inch)(inch)(Thread engagement ratio)(Thread engagement ratio) (inch)(inch)(inch)(inch)
CPCSAUN6HA0.1110(83.1%)0.1148(71.4%)
CPCSAUN6HB0.1128(77.6%)0.1167(65.6%)

No.6-40UNF 1.93 0.35 0.207 0.276 0.345 0.157 1 ○

CPCSAUN6HC0.1147(71.7%)0.1186(59.7%)
CPCSAUN6HD0.1166(65.9%)0.1205(53.9%)
CPCSAUN8JA0.1300(83.8%)0.1345(72.7%)
CPCSAUN8JB0.1324(77.8%)0.1367(67.2%)

No.8-32UNC 2.24 0.43 0.246 0.328 0.410 0.197 1 ○

CPCSAUN8JC0.1346(72.4%)0.1389(61.8%)
CPCSAUN8JD0.1367(67.2%)0.1410(56.7%)
CPCSAUN8IA0.1340(83.1%)0.1377(72.9%)
CPCSAUN8IB0.1359(77.9%)0.1397(67.3%)

No.8-36UNF 2.24 0.43 0.246 0.328 0.410 0.197 1 ○

CPCSAUN8IC0.1378(72.6%)0.1416(62.1%)
CPCSAUN8ID0.1397(67.3%)0.1435(56.8%)
CPCSAUNAMA0.1450(83.1%)0.1502(73.5%)
CPCSAUNAMB0.1475(78.5%)0.1528(68.7%)

No.10-24UNC 2.56 0.55 0.285 0.380 0.475 0.217 1 ○

CPCSAUNAMC0.1502(73.5%)0.1555(63.7%)
CPCSAUNAMD0.1528(68.7%)0.1581(58.9%)
CPCSAUNAJA0.1560(83.7%)0.1601(73.7%)
CPCSAUNAJB0.1581(78.6%)0.1621(68.7%)

No.10-32UNF 2.56 0.55 0.285 0.380 0.475 0.217 1 ○

CPCSAUNAJC0.1601(73.7%)0.1641(63.8%)
CPCSAUNAJD0.1621(68.7%)0.1661(58.9%)
CPCSAUNCMA0.1710(83.1%)0.1758(74.3%)
CPCSAUNCMB0.1733(78.9%)0.1782(69.8%)

No.12-24UNC 2.56 0.55 0.324 0.432 0.540 0.217 1 ○

CPCSAUNCMC0.1758(74.3%)0.1807(65.2%)
CPCSAUNCMD0.1782(69.8%)0.1831(60.8%)
CPCSAUNCKA0.1770(84.0%)0.1815(74.4%)
CPCSAUNCKB0.1794(78.9%)0.1836(69.8%)

No.12-28UNF 2.56 0.55 0.324 0.432 0.540 0.217 1 ○

CPCSAUNCKC0.1815(74.4%)0.1857(65.3%)
CPCSAUNCKD0.1836(69.8%)0.1878(60.8%)
CPCSAU04NA0.1960(83.1%)0.2013(75.0%)
CPCSAU04NB0.1986(79.2%)0.2040(70.8%)

1/4-20UNC 2.87 0.65 0.375 0.500 0.625 0.236 1 ○

CPCSAU04NC0.2013(75.0%)0.2067(66.7%)
CPCSAU04ND0.2040(70.8%)0.2094(62.5%)
CPCSAU04KA0.2110(84.0%)0.2152(75.0%)
CPCSAU04KB0.2131(79.5%)0.2171(70.8%)

1/4-28UNF 2.87 0.65 0.375 0.500 0.625 0.236 1 ○

CPCSAU04KC0.2150(75.4%)0.2190(66.8%)
CPCSAU04KD0.2169(71.3%)0.2209(62.7%)
CPCSAU05OA0.2520(83.8%)0.2577(75.9%)
CPCSAU05OB0.2551(79.5%)0.2604(72.2%)

5/16-18UNC 3.90 0.87 0.469 0.625 0.781 0.315 1 ○

CPCSAU05OC0.2577(75.9%)0.2630(68.6%)
CPCSAU05OD0.2604(72.2%)0.2657(64.8%)
CPCSAU05MA0.2670(84.0%)0.2714(75.9%)
CPCSAU05MB0.2694(79.6%)0.2734(72.2%)

5/16-24UNF 3.90 0.87 0.469 0.625 0.781 0.315 1 ○

CPCSAU05MC0.2714(75.9%)0.2754(68.5%)
CPCSAU05MD0.2734(72.2%)0.2774(64.8%)
CPCSAU06PA0.3070(83.7%)0.3127(76.7%)
CPCSAU06PB0.3101(79.9%)0.3155(73.3%)

3/8-16UNC 4.33 1.08 0.563 0.750 0.938 0.394 1 ○

CPCSAU06PC0.3128(76.6%)0.3182(70.0%)
CPCSAU06PD0.3155(73.3%)0.3209(66.6%)
CPCSAU06MA0.3300(83.1%)0.3336(76.5%)

3/8-24UNF 4.33 1.08 0.563 0.750 0.938 0.394 1 ○

CPCSAU06MB 0.3314(80.6%) 0.3354(73.2%)