Hexagon Nipple

QS Pipe Fitting: Wuxi Hexagon Nipple

ASTM A105 hexagon nipple with NPT threads, class 3000# and BS3799, sized 1/2-2 Inch for high-pressure screwed connections.

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One-Minute Overview

Forged hexagon nipple with male NPT threads at both ends.
1/2-2 Inch, ASTM A105 carbon steel, class 3000#, to BS3799.
The central hex gives a wrench a clean grip while the joint is made.
Sizes, ratings and certificates are confirmed per inquiry.

A hexagon nipple is a short forged connector with male threads at both ends and a hex in the middle, and the hex is the whole point: it gives a wrench somewhere to bite while the joint is tightened. This one uses NPT tapered threads, which seal by interference as the taper wedges together, so the thread form and the sealant matter more than raw torque. ASTM A105 forged carbon steel carries the strength, the class 3000# rating sets the pressure envelope, and BS3799 fixes the dimensions. The 1/2-2 Inch range suits small-bore high-pressure lines. Sizes, thread forms, ratings and materials are confirmed per inquiry, and a detailed specification sheet is available on request.

Name: Hexagon Nipple
Size: 1/2-2 Inch
Ends: NPT
Material: ASTM A105
Class Rating: 3000#
Standard: BS3799
Sizes, thread forms, ratings and materials are confirmed per inquiry, and a detailed specification sheet is available on request.

A hexagon nipple is a short, forged connector with male threads at both ends and a hex in the middle, and the hex is the whole point: it gives a wrench somewhere to bite while the joint is made. This one uses NPT tapered threads, which seal by interference as the taper wedges together, so thread form and sealant matter more than raw torque. ASTM A105 forged carbon steel covers the strength, the class 3000# rating sets the pressure envelope, and BS3799 fixes the dimensions. The 1/2-2 Inch range suits small-bore high-pressure lines. When specifying, name the thread standard on both ends, confirm the schedule of the pipe it joins and keep the material in the same family as the mating parts.

Installation is about clean threads and restraint. Inspect both male ends and the female ports for burrs, apply a sealant rated for the pressure and medium, and tighten by the hex without leaning on the pipe upstream, because that is how a small body cracks. Do not over-torque hoping to fix a weep, since NPT seals on the taper and extra turns mostly gall the threads. On lines that get stripped for maintenance, note the duty so the shop can advise on a compatible grade. Sizes, thread forms, ratings and materials are confirmed per inquiry, so ask for the specification sheet and the material certificate with the order rather than relying on a nominal description.

FAQ

Q1. Why NPT rather than a parallel thread on this nipple?

NPT is tapered, so the male and female flanks wedge together as you tighten and form the seal in the threads themselves. A parallel thread needs a gasket or a shoulder to seal, which adds a part and a leak path. The trade-off is care: clean flanks, the right sealant and a controlled pull, because the taper does the sealing, not brute force.

Q2. Is the 3000# rating a temperature limit too?

It is a pressure class, not a thermometer. The rating sits alongside the material and the service temperature, and allowable pressure falls as the metal gets hotter. State the medium and the working temperature with the order so the class is checked against the real duty instead of being read as a fixed number.

Q3. Do I really need the hex, or can I grip the threads?

Gripping the threads is how you learn an expensive word. The flats take the torque so the tapered flanks are not chewed by the wrench, and they let you hold the nipple still while the other side is tightened. Small forged bodies are strong in pressure and surprisingly fragile under a pipe wrench on the wrong spot.

Q4. How long will production take?

Standard sizes are typically ready within 30 days, and in-stock items ship immediately. Larger or custom orders get a confirmed date per order, because the schedule depends on quantity, material, the bolt pattern you specify, and how busy production is at the moment you order.

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