SPX Cooling Technologies TG MAG23-65, TG MAG185-125 Designation of threaded connections

3.21.7 Designation of threaded connections.

To make clear what sealing type of threaded connection is provided we denominate them according to standards ISO 7/1 and ISO 228/1 as follows.

3.21.7.1Threaded connection Rp (example Rp 1/2)

If no flattened sealing face is provided we call the connection Rp according to ISO 7/1. This connection has to be sealed in the thread.

The plugs or pipe connections must be provided with conical thread according to ISO 7/1 external thread (example ISO 7/1 - R1/2).

Conical plug	Conical pipe end
ISO 7/1 - R 1/2	ISO 7/1 - R 1/2

ISO 7/1	Type	Symbol	Example
Internal	Cynlindrical (parallel)	Rp	ISO 7/1 – Rp 1/2
thread
External	Always conical	R	ISO 7/1 – R 1/2
thread	(tapered)

3.21.7.2Threaded connection G (example G 1/2).

If the threaded connection is provided of a flattened sealing face we call it G according to ISO 228/1.

This connection can be sealed by a gasket. The plugs or pipe connections must be provided with a sealing collar and cylindrical external thread according to ISO 228/1 (Example ISO 228/1 - G1/2). Plugs or pipe connections provided with conical thread according to ISO 7/1 external thread (example ISO 7/1 - R1/2) can also be used.

Plug with collar	Conical pipe end	ISO 228/1	Clearance class	Symbol	Example
ISO 228/1 - G 1/2	ISO 7/1 - R 1/2
		Internal	Only one class	G	ISO 228/1 – G 1/2
		thread
			Class A	G	ISO 228/1 – G 1/2
		External	(standard)
		thread	Class B	G...B	ISO 228/1 – G 1/2 B
			(extra clearance)
		ISO 7/1	Type	Symbol	Example
		External	Always conical	R	ISO 7/1 – R 1/2
		thread	(tapered)

48 A.0500.551 – IM-TGMAG/02.00 EN (02/2008)