Do we order the flange too?

Yes. Order the stainless stub end with a matching stainless lap-joint flange (size and facing).

Long or short pattern?

Per standard or drawing. State it on the inquiry.

Stainless Steel Lap Joint Stub Ends

Name: Stainless Steel Lap Joint Stub Ends
Brand: HuaboPipe

A stub end is butt-welded to the pipe and used with a lap-joint flange that can rotate for bolt alignment.

Specifications

Size

DN15–DN1200 (about 1/2″–48″) usual; larger per drawing, up to DN3000

Wall / SCH

Matched to pipe

Standard

GB/T 12459, ASME B16.9, EN 10253, DIN, JIS; others per drawing

Connection note

Stub end BW to pipe; flange is loose

Grade

304/304L, 316/316L, 310S, 321, 2205, 2507

Material specification

ASTM A403 WP304/WP304L, WP316/WP316L, WP321, WP310S; ASTM A815 WPS31803/S32205, WPS32750

Process

cold-formed → solution annealed → beveling and sizing → surface treatment (polishing, pickling, sand blasting and sand tumbling)

Inspection

MTR available on request; hydrotest/NDT and lead time per order

Marking

Hard stamping or ink marking, per standard or order

Certificates

ISO 9001/14001/45001, PED, DNV, BV, TÜV SÜD factory approvals; see this site’s Certificates page

Inquiry checklist

When inquiring, state: size, wall/SCH, grade, standard, qty; non-standard parts can be made to drawing or sample.

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How to choose

Use a stub end with a lap-joint flange when joints are opened often or the bolt holes must rotate for alignment. Only the stub end is wetted by the fluid. HuaboPipe supplies both the stainless stub end and the stainless lap-joint flange. Short or long pattern per standard or drawing; pair with a lap-joint flange, not a socket-weld (SW) flange.