Type B Stainless Steel Stub End

S&S Stainless International manufactures heavy-duty stainless steel Type B stub ends engineered for cost-effective piping installations using standard ASME B16.5 Slip-On Flanges as backing flanges. Featuring a sharp, square outer corner on the lap flare, Type B stub ends fit flush against the inside edge of a slip-on flange without requiring a specialized lap joint radius, providing a reliable, economical solution for low-to-medium pressure industrial systems. Produced in high-grade 304/304L and 316/316L stainless steel to ANSI/ASME B16.9 and MSS SP-43 specifications, our seamless and welded Type B stub ends are available in both short and long patterns across complete schedule wall thicknesses, delivering excellent corrosion resistance and versatile bolt-hole alignment for chemical processing, water treatment, and industrial plant piping worldwide.

What is Type B stub end ?

The Type B stainless steel stub end is a durable and precision-engineered ASME B16.9 stainless steel pipe fitting designed for use with standard slip-on flanges. Featuring a longer hub and thicker end compared to the Type A stainless steel stub end, the Type B stainless steel stub end is built to handle more demanding applications, providing enhanced strength and pressure resistance. Ideal for high-pressure piping systems, this stub end ensures reliable performance in industrial environments where durability and stability are critical.

Manufactured to meet international standards such as ASME, JIS, and DIN, our Type B stainless steel stub end are perfect for applications requiring robust, corrosion-resistant fittings, commonly used in industries such as oil and gas, chemical processing, and power generation.

Product Overview of Type B Stainless Steel Stub End

  • Specification 
    • Material Grade 304, 316, 316L
    • Nominal Pipe Size 1/2” – 24”
    • Thickness SCH 5S, SCH 10S, SCH 40S, SCH 80S
    • Length ANSI, MSS
  • Product Weight
  • Product Packaging

    • Secure Export Packaging: Packed in seaworthy wooden bundles, protective cardboard, or heat-treated wooden cases to prevent transit damage.

    • Accurate & Labeled: Items are carefully sorted, packed, and labeled against the packing list for correct quantities and easy identification.

Product Specification of Type B Stainless Steel Stub End

DN15 – DN600

ASME B16.9 Type B stainless steel stub end dimension chart, sizing from DN15-600.
 

Nominal Pipe Size Outside Diameter Thickness(mm) Diameter of Lap (G, mm) Length(F, mm) Radius(R, mm)
DN Inch mm SCH 5S SCH 10S SCH 40S SCH 80S ANSI MSS Type A(Max) Type B(Max)
15 ½’’ 21.3 1.65 2.11 2.77 3.73 34.93 76.2 50.8 3.3 0.76
20 ¾’’ 26.7 1.65 2.11 2.87 3.91 42.88 76.2 50.8 3.3 0.76
25 1’’ 33.4 1.65 2.77 3.38 4.55 50.80 101.6 50.8 3.3 0.76
32 1 ¼’’ 42.2 1.65 2.77 3.56 4.85 63.50 101.6 50.8 4.83 0.76
40 1 ½’’ 48.3 1.65 2.77 3.68 5.08 73.02 101.6 50.8 6.35 0.76
50 2’’ 60.3 1.65 2.77 3.91 5.54 92.07 152.4 63.5 7.78 0.76
65 2 ½’’ 73.0 2.11 3.05 5.16 7.01 104.77 152.4 63.5 7.78 0.76
80 3’’ 88.9 2.11 3.05 5.49 7.62 127.00 152.4 63.5 9.65 0.76
100 4’’ 114.3 2.11 3.05 6.02 8.56 157.18 152.4 76.2 11.18 0.76
125 5’’ 141.3 2.77 3.40 6.55 9.53 185.75 203.2 76.2 11.18 1.52
150 6’’ 168.3 2.77 3.40 7.11 10.97 215.90 203.2 88.9 12.7 1.52
200 8’’ 219.1 2.77 3.76 8.18 12.7 269.88 203.2 101.6 12.7 1.52
250 10’’ 273.1 3.4 4.19 9.27 12.7 323.85 254.0 127.0 12.7 1.52
300 12’’ 323.9 3.96 4.57 9.53 12.7 381.00 254.0 152.4 12.7 1.52
350 14’’ 355.6 3.96 4.78 9.53 12.7 412.75 304.8 152.4 12.7 1.52
400 16’’ 406.4 3.96 4.78 9.53 12.7 469.90 304.8 152.4 12.7 1.52
450 18’’ 457.2 3.96 4.78 9.53 12.7 533.40 304.8 152.4 12.7 1.52
500 20’’ 508 4.78 5.54 9.53 12.7 584.20 304.8 152.4 12.7 1.52
550 22’’ 558.8 4.78 5.54 9.53 12.7 641.35 304.8 – 12.7 1.52
600 24’’ 609.6 5.54 6.35 9.53 12.7 692.15 304.8 152.4 12.7 1.52

FAQs

1. What is the key design difference between Type B and Type A stub ends, and which flange type is compatible with Type B?

Type B stub ends feature a square, sharp outer corner on the lap flare instead of a radiused corner. They are specifically engineered to be paired with standard ASME B16.5 Slip-On Flanges used as backing flanges. The square outer corner fits neatly against the inside chamfer of a slip-on flange, eliminating the need to purchase more expensive dedicated lap joint flanges.

We produce Type B stub ends via seamless pipe flanging or hot forging for small-to-medium pipe diameters, as well as welded plate-formed construction for larger industrial sizes. We offer both Long Pattern (ANSI/ASME B16.9) and Short Pattern (MSS SP-43) configurations in wall thickness schedules ranging from light-wall Schedule 10S to Schedule 80S and above, using dual-certified 304/304L and 316/316L stainless steel.

All Type B stub ends undergo full solution annealing heat treatment after flanging to relieve stress and restore peak corrosion resistance. Our quality assurance team checks 100% Positive Material Identification (PMI), verifies lap outer diameter and squareness with precision gauges, and measures wall thickness across the lap-to-barrel junction using ultrasonic thickness meters. Complete EN 10204 3.1 Material Test Reports (MTRs) are provided with every shipment.

Our standard manufacturing lead time is 30 to 45 days following order confirmation and drawing approval. We offer flexible MOQs for standard sizes, allowing international procurement managers to combine Type B stub ends with slip-on flanges, elbows, tees, and reducers into a single consolidated container shipment to minimize sea freight costs.

To safeguard the machined lap face during long-distance shipping, every stub end face is treated with a corrosion-inhibiting oil coating, protected with a plastic cover, and layered with cardboard cushioning. Items are packed inside ISPM-15 heat-treated, seaworthy wooden cases lined with plastic moisture barriers, or securely strapped to wooden pallets for large-diameter shipments. We support trade terms including EXW, FOB, CFR, CIF, and DDP via ocean or air freight.

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