THREADED FLANGE RING PARALLEL ASME 150-900LB ASTM STEEL STAINLESS

1：	Threaded flanges are those with internal threads, being connected by screwing in pipes with matching external threads instead of high-temp welding.
2：	It is advisory to weld both rims after threaded though in no cases this type should be used for pressure piping.
3：	ASME B16.5 Carbon steel and stainless steel
4：	Stock finish, spiral serration (or phonographic), concentric serration and smooth surface

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