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Pipe Threads (BSP / NPT)

NPTF Dryseal Taper Pipe Thread

Dryseal version of NPT with controlled crest and root truncation to seal metal-to-metal without sealant, used for fuel and hydraulic lines.

Standard
ANSI B1.20.3
Flank angle
60°
Taper
1:16
Sizes listed
12
Range
1/16" - 27 NPTF – 4" - 8 NPTF
Profile shape (schematic, not to scale)

Nominal DiameterMajor Diameter mmTapping Drill Size mmTPIPitch mm
1/16" - 27 NPTF7.8706.00270.940
1/8" - 27 NPTF10.2178.25270.940
1/4" - 18 NPTF13.57710.70181.411
3/8" - 18 NPTF17.01614.10181.411
1/2" - 14 NPTF21.21117.40141.814
3/4" - 14 NPTF26.56622.60141.814
1" - 11 1/2 NPTF33.19528.5011.52.209
1 1/4" - 11 1/2 NPTF41.95237.0011.52.209
1 1/2" - 11 1/2 NPTF48.02143.5011.52.209
2" - 11 1/2 NPTF60.06055.0011.52.209
2 1/2" - 8 NPTF72.64265.5083.175
4" - 8 NPTF113.913107.0083.175
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Related Standards

BSPP Parallel Pipe Thread (G) ISO 228-1 / DIN 259 27 rows · G 1/16" – G 6" NPT American Taper Pipe Thread ANSI/ASME B1.20.1 19 rows · 1/16" - 27 NPT – 12" - 8 NPT BSPT Tapered Pipe Thread (R / Rp / Rc) ISO 7-1 / EN 10226 15 rows · R 1/16" – R 6" NPSM Straight Pipe Thread (Mechanical) ANSI B1.20.1 15 rows · 1/8" - 27 NPSM – 6" - 8 NPSM Metric Taper Thread DIN 158 36 rows · M 5 keg – M 60 x 2 keg NPSC Straight Pipe Thread (Couplings) ANSI B1.20.1 13 rows · 1/8" - 27 NPSC – 4" - 8 NPSC

Reference values only. Verify against the current edition of the governing standard before use in production drawings or manufacturing. Provided by Micro Components as a free engineering resource.