MS Buttweld 'B' Class

Stub End

Mild Steel · ASME B16.9 · 14 sizes

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← All B Class (Medium)

MS Buttweld 'B' Class

Buttweld Stub End

7307MSSE40B001

Material: Mild Steel (IS 1239 Part 2 / IS 2062 Gr. A)
Type: Welded (ERW)
Schedule: Class B (Medium)
End Connection: Beveled End (BW)
Dimension Standard: ASME B16.9 Type A
Temperature: -10°C to 300°C
Pressure Rating: ~42 bar (IS 1239 Class B, Medium)
HSN Code: 73079300
GST: 18%

Schematic: letters match the table columns

Illustration

5 columns · scroll sideways

SizeNPS	OD (D)mm	Wall (t)mm	Lap OD (G)mm	Length (F)mm
1/2" NB	21.3	2.0	49.3	38
3/4" NB	26.7	2.0	58.7	38
1" NB	33.4	2.5	68.3	38
1-1/4" NB	42.2	3.0	77.8	38
1-1/2" NB	48.3	3.0	90.5	38
2" NB	60.3	3.0	106.4	51
2-1/2" NB	73.0	3.5	127.0	57
3" NB	88.9	3.5	149.4	57
4" NB	114.3	3.5	185.7	64
5" NB	141.3	4.0	220.7	76
6" NB	168.3	4.0	255.5	76
8" NB	219.1	4.5	323.9	89
10" NB	273.0	4.5	381.0	102
12" NB	323.8	4.5	450.9	102

Pricing: prices for this product are not listed. Request a quotation.

Certification: All relevant test certificates or document will be provided.
Coating: Anticorrosion Paint Charges Included and Hot Dip Galvanizing Coating (GI), Epoxy Coating Charged Extra.
Taxes & Duties: GST and any other statutory levies shall be charged extra at applicable rates.

All dimensions in millimetres. Subject to change without notice. Spotted a mistake or wrong data? Please contact us.

About the stub end

A stub end (lap joint stub end) is welded to the pipe; a loose lap joint flange slides over it. The flange can rotate freely, making bolt-hole alignment trivial. Ideal for expensive alloy pipe where you want cheap carbon steel flanges rotating on a costly alloy stub end.

Welded fitting: stub end is permanently attached to the pipe
Loose backing (lap joint) flange rotates freely for easy bolt-hole alignment
Type A (long pattern) and Type B (short pattern) per ASME B16.9
Lap face (raised shoulder) contacts gasket, same sealing area as raised face flange
Allows different material for stub (alloy/SS) and backing flange (carbon steel)

Applicable Standards

Standards governing design, dimensions, and testing

ASME B16.9

Factory-Made Wrought Buttwelding Fittings

Covers the full range of industrial butt weld fittings (elbows, tees, reducers, caps, returns) in carbon steel, alloy steel, and stainless steel from ½" to 48" NB.

Applies to NPS ½" through 48" (DN 15 through DN 1200)
Schedule wall: STD / XS / XXS plus full SCH range
Radius: Long Radius (LR) 1.5D and Short Radius (SR) 1.0D elbows
Dimensional tables are the only source of 'legal' wall thickness
No pressure-temperature rating: use ASME B31.3 / B31.1 with pipe schedule
End prep: per ASME B16.25 bevel

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MS Buttweld 'B' Class

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