Taper Pipe Taps Measurement of Taper Pipe Taps, Reaming Data and Tap Drill Sizes (USCTI Table 338)
Projection
Reamed Length L1 + L3
Tap Drill for Use w/ Reaming
Tap Drill for Use w/o Reaming
Ream Dia. Large End
Gage Width L1
Size
NPT & NTF
SAE-SHORT
Min. 0.250 0.250 0.397 0.392 0.517 0.503 0.584
Max. 0.375 0.375 0.521 0.516 0.641 0.627 0.772 0.780 0.792 0.760
Min. 0.222 0.222 0.333 0.333 0.429 0.429
Max. 0.259 0.259 0.389 0.389 0.500 0.500
1/16-27 1/8-27 1/4-18 3/8-18 1/2-14 3/4-14 1-11½
0.2515 0.3340 0.4472 0.5826 0.7213 0.9317 1.1691 1.1538 1.7528 2.2267
0.1600 0.1615 0.2278 0.240
0.2711 0.2726 0.3945 0.4067 0.5343 0.5533 0.6609 0.6809 0.6809 0.6969
15/64 21/64 27/64 11/16 57/64 1-1/8 9/16
C Q
7/16 9/16
0.320 0.339 0.400 0.420 0.420 0.436
45/64 29/32 1-9/64 1-31/64 1-23/32 2-3/16
– – – –
– – – –
1¼-11½ 0.592 1½-11½ 0.606
1-15/32 1-45/64 2-3/16
2-11½
0.574
Projection Thru Ring Gage
Reamed Hole Data
Threading Technical
778
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