Dk-Lok USA
Dk-Lok USA
161 West I-65 Service Road
Mobile, AL 36608
Phone: (251) 472-9580
Fax: (251) 450-0962 or (800) 287-8186
[email protected]
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Green Instrument thread Fittings have been developed based on ASME B31.3 for instrumentation and process control in sizes 1/8" to 2". Green Thread and weld fittings have a wrench flat allowing standard Hex wrench assembly. This is one of the Green Pipe fitting benefits.

Male NPT both ends
GNH Series Hex Nipples
GNH Series Hex Nipples-2
Unit of Measure
Items GNH Series Hex Nipples
GNH-2N-S
GNH Series Hex Nipple Fittings 		GNH Series Hex Nipples
GNH-4N-S
GNH Series Hex Nipple Fittings 		GNH Series Hex Nipples
GNH-6N-S
GNH Series Hex Nipple Fittings 		GNH Series Hex Nipples
GNH-8N-S
GNH Series Hex Nipple Fittings 		GNH Series Hex Nipples
GNH-12N-S
GNH Series Hex Nipple Fittings
Material N/A Stainless Steel 316/316L Dual Grade
P - Pipe Size N/A 1/8 N/A 1/4 N/A 3/8 N/A 1/2 N/A 3/4
L N/A 25.7 mm N/A 35.6 mm N/A 36.3 mm N/A 46.7 mm N/A 46.7 mm
E N/A 4.8 mm N/A 7.1 mm N/A 9.6 mm N/A 11.9 mm N/A 15.7 mm
H - Hex N/A 11.1 mm N/A 14.2 mm N/A 17.4 mm N/A 22.2 mm N/A 26.9 mm
Bar Stock N/A ASTM A276 ASTM A479
Forgings N/A ASTM A182 JIS G3214
Temperature Ratings N/A 537 ºC998 ºF
Pipe End Pressure Rating - Male1 N/A 689 bar10000 psig N/A 558 bar8100 psig N/A 524 bar7600 psig N/A 517 bar7500 psig N/A 496 bar7200 psig
Pipe End Pressure Rating - Female N/A 420 bar6100 psig N/A 434 bar6300 psig N/A 345 bar5000 psig N/A 324 bar4700 psig N/A 303 bar4400 psig
  • 1
  • Pressure ratings listed are for temperature up to 37.8° C (100°F)
  • Based on Pressure Piping Code ASME B31.3 pressure rating is calculated with an allowable stress value of 20,000 psi for SS316, 10,000 psi for Brass, and 20,000 psi for Carbon Steel.
  • To determine the working pressure in accordance with Power Piping Code ASME B31.1, multiply psig by 0.94. Brass pressure ratings remain the same.
  • Reducing Hex Bushing (GHB) pressure rating is not covered in this table. See the pressure rating in the dimensional table.