Stainless Steel Pipe Caps

S&S Stainless International manufactures heavy-duty stainless steel pipe caps designed to securely seal the dead end of a piping system, providing a leak-tight barrier that protects pipelines against fluid leakage, contamination, and pressure loss. Produced in premium 304/304L and 316/316L stainless steel grades in compliance with ANSI/ASME B16.9 and MSS SP-43 standards, our ellipsoidal pipe caps feature uniform wall thickness and smooth internal radii for maximum structural integrity under high pressure and temperature. Available in seamless butt-weld, socket-weld, and threaded configurations across complete schedule wall thicknesses, these caps offer long-term corrosion resistance for chemical processing, oil and gas, water treatment, and industrial plant maintenance worldwide.

What is Pipe Cap?

The stainless steel pipe cap is a high-performance pipe fitting used to seal the ends of piping systems, preventing leaks and protecting system integrity. Manufactured in compliance with ASME B16.9 dimensional standards and ASTM A403 material specifications, our stainless steel pipe caps offer excellent corrosion resistance, strength, and durability. Ideal for use in industries such as oil and gas, chemical processing, and water treatment, these caps are suitable for both temporary and permanent pipeline closures.

Complying with international standards such as ASME, ASTM, JIS, and DIN, our stainless steel pipe caps ensure precision, reliability, and long-lasting performance in demanding environments like chemical processing, oil and gas, and water treatment.

Product Overview of Stainless Steel Pipe Cap​

  • Specification 
    • Material Grade 304, 316, 316L
    • Nominal Pipe Size 1/2” – 48”
    • Thickness SCH 5S, SCH 10S, SCH 40S, SCH 80S
  • 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 Stainless Steel Pipe Cap

DN15 – DN600

ASME B16.9 stainless steel pipe cap dimension chart, covering pressure classes from DN15 to 600.
 

Outside Diameter Thickness(mm) Hight H (mm)
DN Inch mm SCH 5S SCH 10S SCH 40S SCH 80S
15 ½’’ 21.3 1.65 2.11 2.77 3.73 25.4
20 ¾’’ 26.7 1.65 2.11 2.87 3.91 25.4
25 1’’ 33.4 1.65 2.77 3.38 4.55 38.1
32 1 ¼’’ 42.2 1.65 2.77 3.56 4.85 38.1
40 1 ½’’ 48.3 1.65 2.77 3.68 5.08 38.1
50 2’’ 60.3 1.65 2.77 3.91 5.54 38.1
65 2 ½’’ 73.0 2.11 3.05 5.16 7.01 38.1
80 3’’ 88.9 2.11 3.05 5.49 7.62 50.8
100 4’’ 114.3 2.11 3.05 6.02 8.56 63.5
125 5’’ 141.3 2.77 3.40 6.55 9.53 76.2
150 6’’ 168.3 2.77 3.40 7.11 10.97 88.9
200 8’’ 219.1 2.77 3.76 8.18 12.7 101.6
250 10’’ 273.1 3.4 4.19 9.53 12.7 127.0
300 12’’ 323.9 3.96 4.57 9.53 12.7 152.4
350 14’’ 355.6 4.78 9.53 12.7 165.1
400 16’’ 406.4 4.78 9.53 12.7 177.8
450 18’’ 457.2 4.78 9.53 12.7 203.2
500 20’’ 508 5.54 9.53 12.7 228.6
600 24’’ 609.6 6.35 9.53 12.7 266.7

FAQs

1. What manufacturing processes are used to produce seamless and welded stainless steel pipe caps?

Our pipe caps are manufactured primarily through seamless deep-drawing or hydraulic press-forming from high-quality stainless steel plate or seamless pipe blanks. This forming process produces a smooth ellipsoidal shape without weak points, providing optimal stress distribution under internal line pressure. All caps undergo full solution heat treatment (annealing) after forming to restore peak corrosion resistance and eliminate work hardening.

During the deep-drawing process, the center crown of a cap can experience material thinning if not properly engineered. Our QC team uses ultrasonic thickness gauges to verify that the minimum wall thickness at both the knuckle radius and center crown complies strictly with ASME B16.9 tolerances. We also perform 100% Positive Material Identification (PMI) chemical testing, dimensional checks on skirt length, and bevel end inspection. Every shipment includes full EN 10204 3.1 Material Test Reports (MTRs).

Standard factory manufacturing lead time is 30 to 45 days after order confirmation and drawing approval. We maintain flexible MOQs for standard pipe cap sizes and schedules in dual-certified 304/304L and 316/316L grades, allowing international buyers to consolidate caps, elbows, tees, reducers, and flanges into a single ocean container shipment.

To protect the open bevel ends and machined surfaces during transit, smaller to medium-sized caps are fitted with protective plastic end covers and packed inside ISPM-15 heat-treated, seaworthy wooden cases lined with waterproof plastic film. Large-diameter caps are securely steel-strapped onto wooden pallets or enclosed in reinforced crates with protective inter-layer cushioning to prevent scratching and metal-to-metal impact.

We accommodate a full range of international commercial trade terms, including EXW, FOB (Taiwan/China ports), CFR, CIF, and DDP. Shipments can be arranged as Full Container Load (FCL) or Less than Container Load (LCL) via ocean freight. For urgent job sites, emergency plant maintenance, or sample testing, expedited express air freight options are also available.

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