Transcription of Technical Information
1 Technical InformationThread Identification Guide3727 Westgate Rd. Grand Island, NE 68803 Phone: 800-323-5749 Fax: 308-382-0253 NPSMNPTF, BSPT and BSPP measure 1/4 larger than their actual size. For example, a 1/4 NPTF, BSPT or BSPP will actually measure 1/2 on the O. D. of the threads. JIC, SAE O-ring & Flat Face threads measure as listed below. The first number listed is the size of thread, the second number is the threads per Sizing ChartThread Sizing KitAllows the user to properly identify threads of all hydraulic types. This handy kit includes a fractional thread pitch gauge, a metric thread pitch gauge, inside & outside caliper (inches and millimeters), a seat angle gauge (24 degree/30 degree/37 degree/45 degree), 27-page fluid ports & connections identification guid. A carrying case is standard for easy and convenient ( pipe )JIC (37 )SAE (O-Ring)Face Seal (Flat Face)BSPP (Parallel)BSPT (Tapered)-21/8 - 275/16 - 245/16 - 24-1/8 - 281/8 - 28-3-3/8 - 243/8 - 24--- -41/4 - 187/16 - 207/16 - 209/16 - 181/4 - 191/4 - 19-5-1/2 - 201/2 - 20----63/8 - 189/16 - 189/16 - 1811/16 - 163/8 - 193/8 -19-81/2 - 143/4 - 163/4 - 1613/16 - 161/2 - 141/2 - 14-10-7/8 - 147/8 - 141 - 14---123/4 - 141-1/16 - 121-1/16 - 121 3/16 - 123/4 - 143/4 - 14-14-1-3/16 - 121-3/16 - 121 5/16 - 12---161 - 11-1/21-5/16 - 121-5/16 - 121 7/16 - 121 - 111 - 11-201-1/4 - 11-1/21-5/8 - 121-5/8 - 121 11/16 - 121-1/4 - 111-1/4 - 11-241-1/2 - 11-1/21-7/8 - 121-7/8 - 122 - 121-1/2 - 111-1/2 - 11-322 - 11-1/22-1/2 - 122-1/2 - 122 1/2 - 122 - 112 - 11 Stock NumberShip (National pipe Thread Mechanical) HalfFemale Half30 Commonly referred to as female pipe swivels, this connection is still widely used in fluid power systems.
2 The NPSM thread design differs from the NPTF pipe thread design which seals on the threads themselves. The NPSM female pipe swivel seals on a 30 seat (flare) and is visible down inside of the swivel nut. This swivel nut is permanently attached to the body and mates with a male pipe thread that has a 30 seat (chamfer) machined into the end. The threads bring both 30 seats (flare and chamfer) together creating a metal-to-metal mechanical seal. Please note that not all male NPTF threads have a chamfer machined into the end. The SAE standard does not require the chamfer to be machined. Sometimes a male NPTF thread adapter or fitting will have what looks like a small chamfer, but is in fact a small deburr that does not meet the requirement for the metal-to-metal mechanical seal. Inch SizeDash SizeNominal Thread SizeMale Thread Thread - 2712/32 ( )3/8 ( )1/4041/4 - 1817/32 ( )1/2 ( )3/8063/8 - 1811/16 ( )5/8 ( )1/2081/2 - 1427/32 ( )25/32 ( )3/4123/4 -141 1/16 ( )1 ( )1161 - 11 1/21 5/16 ( )1 1/4 ( )1 1/4201 1/4 - 11 1/21 21 32 ( )1 19 32 ( )1 1/2241 1/2 - 11 1/21 29 32 ( )1 13 16 ( )2322 - 11 1/22 3/8 ( )2 5 16 ( )
