Simple Inspection Tools

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)

CPCSAU06MC 0.3332(77.2%) 0.3372(69.8%)

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

CPCSAU06MD0.3351(73.7%)0.3391(66.3%)
CPCSAU07QA0.3600(83.5%)0.3660(77.1%)
CPCSAU07QB0.3630(80.3%)0.3688(74.0%)

7/16-14UNC 4.76 1.30 0.656 0.875 1.094 0.472 1 ○

CPCSAU07QC0.3659(77.2%)0.3717(70.9%)
CPCSAU07QD0.3688(74.0%)0.3746(67.8%)
CPCSAU07NA0.3830(83.9%)0.3875(77.0%)
CPCSAU07NB0.3855(80.1%)0.3896(73.7%)

7/16-20UNF 4.76 1.30 0.656 0.875 1.094 0.472 1 ○

CPCSAU07NC0.3875(77.0%)0.3916(70.7%)
CPCSAU07ND0.3896(73.7%)0.3937(67.4%)
CPCSAU08RA0.4170(83.1%)0.4225(77.6%)
CPCSAU08RB0.4196(80.5%)0.4254(74.7%)

1/2-13UNC 4.76 1.30 0.750 1.000 1.250 0.472 1 ○

CPCSAU08RC0.4226(77.5%)0.4284(71.7%)
CPCSAU08RD0.4255(74.6%)0.4313(68.8%)
CPCSAU08NA0.4460(83.1%)0.4498(77.3%)
CPCSAU08NB0.4477(80.5%)0.4517(74.4%)

1/2-20UNF 4.76 1.30 0.750 1.000 1.250 0.472 1 ○

CPCSAU08NC0.4497(77.4%)0.4537(71.3%)
CPCSAU08ND0.4516(74.5%)0.4556(68.4%)