■For American taper pipe threads (NPT) ■For American Dryseal taper pipe threads (NPTF)

Unit:mm Unit:mm

Bar diameterOutside diameterBar diameterOutside diameter
SizeTaper (tip diameter)Straightof pipe (for reference)SizeTaper (tip diameter)Straightof pipe (for reference)
1/16-27 NPT7.647.937.9381/16-27 NPTF7.617.937.938
1/8-27 NPT9.9810.2810.2871/8-27 NPTF9.9510.2810.287
1/4-18 NPT13.2513.7113.7161/4-18 NPTF13.2013.7113.716
3/8-18 NPT16.6717.1417.1453/8-18 NPTF16.6317.1417.145
1/2-14 NPT20.721.321.3361/2-14 NPTF20.721.321.336
3/4-14 NPT26.026.626.6703/4-14 NPTF26.026.626.670
1 -11 NPT32.533.333.4011 -11 NPTF32.533.433.401
1 1/4-11 1/2 NPT41.342.142.1641 1/4-11 1/2 NPTF41.342.142.164

■For American parallel pipe threads (NPSM)

Unit:mm

Outside diameterof external threadOutside diameter
SizeMax.Min.Bar diameterof pipe (for reference)
1/16-27 NPSM7.7217.5447.597.938
1/8-27 NPSM10.0839.9069.9510.287
1/4-18 NPSM13.36013.13213.1913.716
3/8-18 NPSM16.81416.58716.6417.145
1/2-14 NPSM20.90420.65120.721.336
3/4-14 NPSM26.26326.01026.126.670
1 -11 1/2 NPSM32.84232.53832.633.401
1 1/4-11 1/2 NPSM41.60541.30141.442.164

Technical Inf