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ASTM A182 316L Stailess Steel Threaded Union Mss SP 83

What is a THD Uninon,what about its speicification and advantage

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What is a threaded union?

The stainless threaded union joint consists of three parts – a nut, a female end, and a male end.

To make the stainless threaded union fitting work properly, both male and female ends are secured together with nuts.

Usually, two types of threaded union are offered F/F and F/M.

The female threaded union fitting has threads on the inside, while the threads are on the outside of the male threaded fitting. The male/female threaded union has a male connection end and one female threaded connection end.


Specification of THD union

size range 1/8″-3″/DN6-80
Pressure rating Class 3000lbs
Standard Mss Sp83
Carbon Steel ASTM A150/A150N
Low Tem Carbon Steel ASTM A350 LF2/LF3
Pipeline Steel ASTM A694  F42/46/56/60/65
Alloy Steel ASTM A182 F11/F12/F5/F9/F91/F92
Stinless Steel ASTM A182 F304/304L/304H,316,316L,310S,317,347,904L

Advantages of THD union

They are reliable.
Less force is required to tight a joint because of the mechanical advantage offered by spanner.
They have small overall dimensions and are compact in construction.
Threads have self-locking property hence they can be used in any position either vertical or horizontal


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