Technical data

01

Nominal size	DN6 – DN100
Pressure rating	PN6 – PN63
Standard	DIN · ANSI
Connection type	Threaded
Design	DIN 2986 EN 10241EN 10241Steel threaded pipe fittings BS 1387 ASTM A 865
End connection standard	ISO 7-1 (BSP)ISO 7-1Pipe threads where pressure-tight joints are made on the threads (R/Rp) ANSI NPT

The standards listed apply to stocked products. Contact us for other standards.

Material

02

Material	SS316SS304St37

Features

03

Design

A union has three main parts: the threaded body, the union nut that tightens the joint, and a gasket or sealing face.
They are threaded on, usually sealed with PTFE tape or liquid sealant.
Being easy to undo, they make maintenance much easier than permanent joints.

Advantages

Quick connection: threaded joints without welding.
Wide compatibility: many thread types and sizes.
Easy repair: quick replacement in case of leaks or damage.
Economical: fast connections at low cost.

Considerations

Thread compatibility matters: choose correctly between standards such as BSP and NPT.
Seal with PTFE tape or a gasket.
Choose the material to suit the application; stainless nipples are recommended for chemicals.
Overtightening can strip threads or crack the nipple; torque-controlled assembly is recommended.

Union type	Characteristics	Applications
Straight union	Straight connection, same size at both ends	Standard pipe runs
Elbow union (90°)	90° change of direction between two pipes	Changing direction in tight spaces
Reducing union	Joins two different sizes	Where a size change is needed
Flanged union	Includes a flanged connection	Detachable joint in high-pressure systems

Accessories

04

PTFE tape

PTFE (Teflon) tape is a thin, flexible sealing tape made of polytetrafluoroethylene. It is widely used on threaded pipe joints to prevent leaks and ensure a tight seal.