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Screwed Fittings

General Information on Screwed Fittings


Quality Standard for Screwed Fittings

High quality fittings all made and controlled to the relevant standards such as: ASME, ASTM, BS and DIN/WERKSTOFFE.

Sizes Available for Screwed Fittings

Screwed Fittings are available available in sizes from 1/8” through to 4”.

Dimensions & Pressure Ratings for Screwed Fittings

BS3799 and ANSI B16.11
3000lb through to 9000lb
Sch 10s through to Sch XXS and heavier.

Sizes Available for Reinforced Branch Outlets

1/4” through to 24”
Dimensions to manufacturers standards.
Sch 10s through to Sch XXS and heavier.

***Special fittings according to customer drawings.***

Thread Types


Material Grades for Screwed Fittings

Screwed Fittings are available in the following material grades:


Stainless Steel

  • A182 F304/L
  • F310
  • F316/L
  • F321/H
  • F347/H
  • F410
  • F440
  • 904L

Carbon Steel

  • A105

6% Molly & 6 Moly

  • A182 F44

Low Temperature Steel

  • A350 LF2, LF3, LF6

Alloy Steel

  • A182 F1, F5, F9, F11, F12, F22, F91

High Yield

  • A694 F42, F52, F60, F65, F70

Nickel Alloys

  • 200, 400, K500, 600, 625, 800, 825

6% Moly / Duplex & Super Duplex

  • A182 F51, A182 F53, F55,
  • UNS S32750, UNS S32760



  • ALLOY 20
  • ALLOY C276
  • ALLOY B2


  • 5083, 5154, 5251, 6061, 6063, 6082

Unusual Grades

  • Bronze
  • Brass
  • Copper
  • Cupro Nickel
  • Titanium


Screwed Elbow Fittings

The Screwed Elbow Fitting is a pipe fitting installed between two lengths of pipe or tube allowing a change of direction, usually 90° or 45°. The ends can be be machined for screwed (usually female), or socketed. When the two ends differ in size, it is called a Reducing or Reducer Elbow.

Most Elbows are available in short radius or long radius of types. The short radius Elbows have a center to end distance equal to the NPS in inches, while the long radius is 1.5 times the NPS in inches.

Screwed Tee Fittings

Screwed Tee Fitting is used to either combine or split a fluid flow. The most common Screwed Tees have the same inlet and outlet sizes, but ‘reducing’ Screwed Tees are available as well.

Screwed Cross Fittings

Screwed Cross Fitting has one inlet and three outlets, or vice versa. Screwed Cross Fittings are easy to install and remove and are available in various sizes and threading.

Screwed Couplings

Screwed Coupling connects two pipes to each other. If the material and size of the pipe are not the same, the fitting may be called a ‘Reducing Coupling’ or Reducer, or sometimes an Adapter.

Screwed Cap Fittings

Screwed Cap is a type of pipe fitting, usually liquid or gas tight, which covers the end of a pipe to stop flow. A Screwed Cap has a similar function to a Plug.

Screwed Union Fittings

Screwed Union Fitting is similar to a Coupling, except it is designed to allow quick and convenient disconnection of pipes for maintenance or fixture replacement. While a Coupling would require either solvent welding or being able to rotate all the pipes adjacent as with a Threaded Coupling, a Union provides a simple nut transition, allowing easy release at any time.

Screwed Plugs

Screwed Plug pipe fitting closes off the end of a pipe. It is similar to a Screwed Cap but it fits inside the fitting it is mated to.

Screwed Bushes & Hex Bushes

Screwed Bushes and Hex Bushes are pipe fittings of which the external thread is larger than its internal thread to allow two pipes of different sizes to be connected together. A pipe fitting with male and female threads that extends a run by joining two pipes of different diameter.

Also, a removable lining or sleeve inserted or screwed into an opening to limit its size, resist wear or corrosion, or serve as a guide.

Pipe Nipples and Barrel Nipples

Pipe Nipple or Barrel Nipple is defined as being a short stub of pipe which has two male ends. Nipples are commonly used for plumbing and hoses, and second as Valves for funnels and pipes.

Concentric Swages and Eccentric Swages

The most common use of Swaging is to attach fittings to pipes or cables (also called wire ropes); the parts loosely fit together, and a mechanical or hydraulic tool compresses and deforms the fitting, creating a permanent joint. Pipe flaring machines are another example. Flared pieces of pipe are sometimes known as “Swage Nipples,” “Pipe Swages,” or “Reducing Nipples.

Buttweld Branch Outlet Fittings

“Outlet” is a generic term for all branch type connections. They can come with Threaded, Socket Weld, and Butt Weld end connections. The most common types are used in place of a Tee. A hole is cut in the side of the pipe, the Outlet is welded in place over the hole and then the additional length of pipe is attached to the Outlet.

Similar to reducing Tees, Outlets are usually described by two sizes. The Run or Header size refers to the pipe on which the Outlet is mounted. The Outlet or Branch size refers to the length of pipe branching off of the run.

This type of fitting is contoured to match the curve on the Header Pipe and beveled on the Branch side to mate up with a beveled piece of the branch pipe.

Male / Female 90° Street Elbows

Street Elbow is a type of plumbing or piping fitting intended to join a piece of pipe and another fitting at an angle. The difference between a “Street Elbow” and a regular Elbow is the nature of the fittings on either end.

A Street Elbow has a female fitting (hub or FIP) on one side and a male pipe or MIP fitting on the other end. The advantage of the Street Elbow is that it can be connected directly to another fitting without having to use a short connecting piece called a pipe Nipple.

They can be used in water supply, drainage, sewer vents, central vacuum systems, compressed air and gas lines, HVAC, sump pump drains, and any location where plumbing fittings would be used to join sections of pipe.

Welding Bosses

Welding Bosses 3000# & 6000#.

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