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| HELI-COIL TAP PART NUMBERS AND DIMENSIONS PLUG STYLE, FINE |
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| Nominal Thread Size |
Part Number |
Tap Dimensions | Number of Flutes | H Limits | ||||||||
| (A) Length Overall |
(B) Length of Thread |
(C) Length of Square |
(D) Max. Dia. of Shank |
Max. Size of Square |
Straight Flute |
Spiral Point Plug |
Spiral Flute Bottom |
Style* | 3B | 2B | ||
 |
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| 3(.099)-56 | 03FPB | 1-5/16 | 5/8 | 3/16 | .141 | .110 | 3 | 2 | 2 | 1 | H1 | H2 |
| 4(.112)-48 | 04FPB | 2 | 11/16 | 3/16 | .141 | .110 | 3 | 2 | 2 | 1 | H1 | H2 |
| 6(.138)-40 | 06FPB | 2-1/8 | 3/4 | 1/4 | .168 | .131 | 3 | 2 | 3 | 1 | H1 | H2 |
| 8(.164)-36 | 2FPB | 2-3/8 | 15/16 | 9/32 | .220 | .165 | 3 | 2 | 3 | 1 | H1 | H2 |
| 10(.190)-32 | 3FPB | 2-1/2 | 1 | 5/16 | .255 | .191 | 3 | 2 | 3 | 2 | H2 | H3 |
| 1/4(.2500)-28 | 4FPB | 2-23/32 | 1-1/8 | 3/8 | .318 | .238 | 3 | 2 | 3 | 2 | H2 | H3 |
| 5/16(3.125)-24 | 5FPB | 2-15/16 | 1-1/4 | 7/16 | .381 | .286 | 4 | 3 | 3 | 2 | H2 | H3 |
| 3/8(.3750)-24 | 6FPB | 3-5/32 | 1-7/16 | 13/32 | .323 | .242 | 4 | 3 | 3 | 3 | H2 | H3 |
| 7/16(.4375)-20 | 7FPB | 3-3/8 | 1-21/32 | 7/16 | .367 | .275 | 4 | 3 | 3 | 3 | H3 | H4 |
| 1/2(.5000)-20 | 8FPB | 3-19/32 | 1-21/32 | 1/2 | .429 | .322 | 4 | 3 | 4 | 3 | H3 | H4 |
| 9/16(.5625)-18 | 38193-9 | 3-13/16 | 1-13/16 | 9/16 | .480 | .360 | 4 | — | — | 3 | H3 | H4 |
| 5/8(.6250)-18 | 8193-10 | 4-1/32 | 1-13/16 | 5/8 | .542 | .406 | 4 | — | — | 3 | H3 | H4 |
| 3/4(.7500)-16 | 8193-12 | 4-15/32 | 2 | 11/16 | .652 | .489 | 4 | — | — | 3 | H3 | H4 |
| 7/8(.8750)-14 | 8193-14 | 5-1/8 | 2-1/2 | 13/16 | .800 | .600 | 4 | — | — | 3 | H3 | H4 |
| 1(1.0000)-14 | 8193-16 | 5-7/16 | 2-9/16 | 7/8 | .896 | .672 | 4 | — | — | 3 | H4 | H4 |
| 1(1.0000)-12 | 8193-161 | 5-7/16 | 2-9/16 | 7/8 | .896 | .672 | 4 | — | — | 3 | H4 | H6 |
| 1-1/8(1.1250)-12 | 8193-18 | 5-3/4 | 2-9/16 | 1 | 1.021 | .766 | 6 | — | — | 3 | H4 | H6 |
| 1-1/14(1.2500)-12 | 8193-20 | 6-1/16 | 3 | 1-1/16 | 1.108 | .831 | 6 | — | — | 3 | H4 | H6 |
| 1-3/8(1.3750)-12 | 8193-22 | 6-3/8 | 3 | 1-1/8 | 1.233 | .925 | 6 | — | — | 3 | H4 | H6 |
| 1-1/2(1.5000)-12 | 8193-24 | 6-11/16 | 3-3/16 | 1-1/8 | 1.305 | .979 | 6 | — | — | 3 | H4 | H6 |