IFI 199 Tap Bolts, Inch Series
IFI-199 covers fully threaded inch-series hex-head tap bolts. The drawing identifies shank diameter, head dimensions and length.
Selected inch dimensions (in)
| Thread | UNC TPI | F basic | F max | F min | G max | G min | H nominal |
|---|---|---|---|---|---|---|---|
| 1/4 | 20 | 7/16 | .438 | .425 | .505 | .484 | 11/64 |
| 5/16 | 18 | 1/2 | .500 | .484 | .577 | .552 | 7/32 |
| 3/8 | 16 | 9/16 | .562 | .544 | .650 | .620 | 1/4 |
| 1/2 | 13 | 3/4 | .750 | .725 | .866 | .826 | 11/32 |
Selected UNC sizes for reference. Verify thread series and dimensions against the applicable IFI edition and order.