Name: Forged Threaded Barrel Nipple
Brand: Cunimet Alloy International

Product Overview

Forged Threaded Barrel Nipple

The Forged Threaded Barrel Nipple is a short pipe fitting with male NPT external threads at both ends and a plain cylindrical barrel body in the centre. Both threaded ends screw into female-threaded outlets on separate fittings, connecting them in a straight run with a defined standoff distance set by the barrel length. The difference between a barrel nipple and a hex nipple is the body profile — the barrel nipple has a round cylindrical centre (no wrench flats), requiring a pipe wrench to be used on the barrel body for installation.

Cunimet Alloy International manufactures barrel nipples in Short (S) and Long (L) standard barrel lengths, and can supply custom lengths to order. Both thread ends are machined on CNC centres to ASME B1.20.1 (NPT) tolerances. The round barrel body allows the nipple to be turned in confined radial spaces where a hex body would foul on adjacent pipework or structure.

ASME B16.11 ASME B1.20.1 (NPT) 1/8" to 4" NPS 3000# • 6000# Male NPT Both Ends Short • Long • Custom

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ASMEStandardB16.11

M/MThread ConfigMale NPT Both Ends

1/8–4"Size RangeNPS

3000#Pressure ClassAlso 6000#

3Material GradesSS / Duplex / S.Duplex

Technical Dimensions

Barrel Nipple — Standard Lengths per ASME B16.11

Standard barrel lengths: Short (S) has the minimum unthreaded barrel length between thread runouts. Long (L) provides additional standoff. Custom lengths available to specified overall length. Thread form NPT per ASME B1.20.1. All dimensions in millimetres.

NPS	O.D. (mm)	Overall Length “L” — Class 3000# (mm)		Overall Length “L” — Class 6000# (mm)		TPI
NPS	O.D. (mm)	Short Barrel	Long Barrel	Short Barrel	Long Barrel	TPI
1/8"	10.3	38	64	44	70	27
1/4"	13.7	44	76	51	83	18
3/8"	17.1	51	89	57	95	18
1/2"	21.3	57	102	67	114	14
3/4"	26.7	64	114	76	127	14
1"	33.4	76	127	89	152	11.5
1-1/4"	42.2	89	152	102	178	11.5
1-1/2"	48.3	102	178	114	203	11.5
2"	60.3	114	203	127	229	11.5
2-1/2"	73.0	127	229	152	254	8
3"	88.9	152	254	178	305	8
4"	114.3	190	305	216	356	8

Custom barrel lengths available on request. O.D. of barrel body is equal to the nominal pipe OD for the respective NPS. BSP threads to BS EN 10226 available. All dimensions in millimetres.

Available Materials

Material Grades for Threaded Barrel Nipples

Grade 01

Stainless Steel 304 / 316

Austenitic stainless barrel nipples for joining female-threaded fittings in chemical, pharmaceutical, food and water treatment systems. SS 316 for chloride-bearing environments, marine and offshore screwed instrument and process piping.

ASTM A182 F304ASTM A182 F316ASME B16.11

Grade 02

Duplex Steel

High-strength duplex barrel nipples for offshore screwed connections, chemical plant instrument piping and desalination utility systems where both ends must provide equal corrosion resistance at all male thread surfaces throughout service life.

ASTM A182 F51UNS S31803UNS S32205

Grade 03

Super Duplex Steel

Premium super duplex barrel nipples with PREN greater than 40 for male threaded connections in seawater service, offshore topsides screwed piping and aggressive chloride-bearing environments where maximum corrosion resistance at every joint is specified.

ASTM A182 F53UNS S32750UNS S32760

Applications

Where Threaded Barrel Nipples Are Used

01

Standoff Between Fittings

Providing a defined separation distance between two female-threaded fittings — such as between a valve and a tee, or an elbow and a coupling — where the barrel length sets the physical gap required by the piping layout.

02

Instrument Connection Extensions

Extending instrument tapping points away from the pipe wall using a barrel nipple between the half coupling weld-on and the instrument valve, positioning the valve and instrument at a convenient height and angle for operator access.

03

Pipe Length Extension

Adding short increments of threaded pipe length to a screwed piping run where cutting and re-threading existing pipe is impractical, using a standard barrel nipple to fill the gap between two female-threaded fittings.

04

Chemical & Offshore Systems

Short threaded extensions throughout offshore instrument and utility screwed piping in Stainless Steel or Duplex Steel, providing male-to-male connections where all adjacent fittings carry female NPT threads.

Threaded Fittings Range

Forged Threaded Barrel Nipple

Forged Threaded Barrel Nipple

Barrel Nipple — Standard Lengths per ASME B16.11

Material Grades for Threaded Barrel Nipples

Stainless Steel 304 / 316

Duplex Steel

Super Duplex Steel

Where Threaded Barrel Nipples Are Used

Standoff Between Fittings

Instrument Connection Extensions

Pipe Length Extension

Chemical & Offshore Systems

Other Forged Threaded Fittings

Threaded Hex Nipple

Swage Nipple

Street Elbow

Threaded Full Coupling

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