Forged Cap Manufacturer, Supplier & Exporter
A forged cap closes the open end of a small-bore pipe. Raaj Fittings manufactures and exports forged caps to ASME B16.11 — socket weld caps that fit over the pipe and are fillet-welded, and threaded caps that screw onto a male-threaded pipe end — from ⅛" to 4" NPS, in stainless steel, duplex, nickel alloys, carbon steel and alloy steel.
Caps are used to terminate dead legs, close spare connections, finish vents and drains, and seal lines for pressure testing. The forged body has a solid end wall rated to the same pressure class as other ASME B16.11 fittings, so the closure is as strong as the pipe it closes.
All caps are supplied with EN 10204 3.1 mill test certificates, with 3.2 certification and third-party inspection on request.
We export forged caps to EPC contractors, plant operators and stockists across the Middle East and GCC, Europe and the Americas — with NPT threads for US and Gulf projects or BSP threads where European and Middle Eastern specifications call for them.
Cap Specifications
⅛" NPS to 4" NPS (DN 6 to DN 100)
Socket weld: Class 3000, 6000 and 9000. Threaded: Class 2000, 3000 and 6000
NPT to ASME B1.20.1; BSPT and BSPP to BS 21 / ISO 7-1
Socket weld (fits over the pipe) or female threaded
Forged or machined from forged bar, then CNC machined
EN 10204 3.1 mill test certificate as standard; EN 10204 3.2 on request
Materials & Grades
We supply forged caps in the following materials and grades. All grades are supplied with EN 10204 3.1 / 3.2 Mill Test Certificates.
Stainless Steel Forged Caps
Stainless steel forged fittings deliver excellent corrosion resistance in chemical, pharmaceutical, food processing, and marine environments. All grades supplied to ASTM A182 specification.
(ASTM A182 F304 / F304L) General corrosion resistance; food processing, dairy, and chemical service
(ASTM A182 F316 / F316L) Superior chloride and acid resistance; pharmaceutical, offshore, and chemical processing
(ASTM A182 F316H) Elevated-temperature creep strength for high-temperature process service
(ASTM A182 F317 / F317L) Higher molybdenum content; superior corrosion resistance in concentrated acid service
(ASTM A182 F321) Titanium-stabilised; resists sensitisation at sustained elevated temperatures
(ASTM A182 F347) Columbium-stabilised; used in heat exchangers and high-temperature piping
Duplex & Super Duplex Stainless Steel Forged Caps
Delivering approximately twice the yield strength of austenitic stainless steel with excellent resistance to stress corrosion cracking, pitting, and erosion — ideal for offshore, subsea, and chemical processing environments.
(UNS S31803 / S32205, ASTM A182 F51) Offshore topsides, chemical plant, and seawater cooling systems
(UNS S32750, ASTM A182 F53) Subsea equipment, desalination, and high-chloride offshore service
(UNS S32760, ASTM A182 F55) High-temperature, high-chloride offshore and subsea service applications
Nickel Alloy Forged Caps
For the most severe corrosive, high-temperature, and sour service environments where standard stainless steel grades are insufficient.
(UNS N06600) High-temperature oxidation and carburisation resistance
(UNS N06625) Outstanding corrosion resistance; offshore, chemical, and subsea service
(UNS N08825) Resistance to phosphoric and sulfuric acids; FGD and chemical plant
(UNS N10276) Universal corrosion resistance across the widest range of aggressive media
(UNS N06022) Superior resistance to oxidising and reducing acids and pitting attack
(UNS N04400) Seawater, hydrofluoric acid, and marine and alkali service
(UNS N08020) Engineered for sulfuric acid and aggressive chemical process service
Exceptional corrosion resistance in seawater and oxidising media at low density
Carbon Steel Forged Caps
Carbon steel is the standard material for forged fittings in general-purpose, hydrocarbon, steam, and elevated-temperature service. The primary grade for forged carbon steel fittings is ASTM A105.
Primary grade for forged carbon steel fittings and flanges — covers ambient and elevated-temperature service in pressurised piping systems.
Low-temperature carbon steel, impact-tested for service down to -46°C (-50°F) — LNG, cold climate, and cryogenic piping applications.
Low-temperature carbon steel, impact-tested to -101°C (-150°F) — for the most demanding cold-temperature service applications.
Alloy Steel Forged Caps
Chromium-molybdenum alloy steel grades for high-temperature, high-pressure service in power generation, petrochemical, and refinery applications. All grades supplied to ASTM A182 specification.
(5% Cr · ½% Mo) Refinery hydroprocessing and high-temperature service
(9% Cr · 1% Mo) High-temperature steam and hydrogen-rich process service
(1¼% Cr · ½% Mo) Thermal power plant steam, feedwater, and reheat piping
(2¼% Cr · 1% Mo) Reactors and high-temperature pressure piping in petrochemical plants
(9% Cr · 1% Mo · V · Nb) Ultra-supercritical power plant main steam and hot reheat piping
Socket Weld Cap or Threaded Cap?
A socket weld cap slides over the end of the pipe, which is withdrawn about 1.6 mm (1/16") from the bottom of the socket, and is sealed with a fillet weld. It gives a permanent, leak-tight closure for hydrocarbon and high-pressure service. A threaded cap screws onto a pipe with a male thread; it can be removed, which makes it useful for test points and temporary closures.
- Dead ends — terminate small-bore headers and branches.
- Vents and drains — close the end of vent and drain pipes after the valve.
- Pressure testing — seal pipe ends during hydrostatic tests.
- Spare connections — close nipples left for future instruments.
Cap or Plug?
A cap closes a pipe end — it has a female socket or thread and fits over the pipe. A forged plug closes a fitting or valve outlet — it has a male thread and screws into a female opening. Choose the one that matches the end you need to close. A half coupling left as a spare connection can be closed with a plug.
Class and Schedule
Choose the cap class to suit the pipe: socket weld 3000 with SCH 80, 6000 with SCH 160, 9000 with XXS; threaded 2000 with SCH 80, 3000 with SCH 160, 6000 with XXS. For larger lines, a buttweld pipe cap to ASME B16.9 is used.
Applications & Industries
- Vent, drain and bleed lines in refineries and process plants
- Dead-end terminations of small-bore headers
- Hydrostatic test closures
- Instrument and sample line spare connections
- Hydraulic and lube oil systems
- Offshore small-bore piping in duplex and super duplex
When ordering, give the size, class, end type, thread form for threaded caps and the material grade — for example ¾" Class 3000 socket weld cap, ASTM A105N. Caps are often supplied together with matching nipples and valves so that vents and drains can be completed in one shipment.
See the complete range of forged fittings.
Testing, Inspection, Marking & Packing
Forged caps are produced under our quality assurance process:
- Incoming material verification with PMI testing
- Chemical and mechanical testing to ASTM A105, A350, A182 or the applicable nickel alloy specification
- Heat treatment as required, with pickling and passivation for stainless steels
- Dimensional inspection of socket bore and depth, end wall thickness and thread gauging
- Marking with manufacturer’s mark, grade, size, class and heat number
Supplied with EN 10204 3.1 mill test certificates; EN 10204 3.2 certificates and third-party inspection are available on request.
Fittings are packed for export with plastic caps protecting threads and sockets, rust-preventive or VCI wrapping on carbon and alloy steel, and seaworthy wooden cases; marking, tagging and packing to your specification are available on request.
Why Choose Raaj Fittings for Forged Caps?
Raaj Sagar Steels has supplied piping components since 2003 and today manufactures forged fittings at two plants in India for buyers in the Middle East, Europe and the Americas.
- Manufactured in-house — Forged caps are made in our own plants, so material, dimensions and delivery stay under our control.
- Ready stock, short lead times — common sizes and grades are held in stock for prompt dispatch; other sizes, grades and specials are manufactured to order.
- Certified quality — ISO 9001:2015, ISO 14001:2015 and ISO 45001:2018 certified; PED 2014/68/EU and IBR supply available, and NACE MR0175 / ISO 15156 material on request.
- 100% material verification — PMI testing on incoming material and EN 10204 3.1 mill test certificates with every order; 3.2 certificates on request.
- Third-party inspection ready — we regularly work with SGS, Bureau Veritas, TÜV and DNV.
- Export documentation — MTCs, certificates of origin, packing lists and inspection reports to suit projects in the GCC, Europe and the Americas.
- Export packing — seaworthy packing with end and face protection, and packing to your specification on request.
- Fast response — our team replies to enquiries within one business day.
Forged Caps — FAQs
A forged cap is an ASME B16.11 fitting that closes the end of a small-bore pipe, either by fitting over it and being fillet-welded (socket weld) or by screwing onto it (threaded).
A cap fits over a pipe end and has a female socket or thread. A plug has a male thread and screws into a female opening on a fitting or valve.
Socket weld caps in Class 3000, 6000 and 9000; threaded caps in Class 2000, 3000 and 6000.
Yes. Threaded caps can be unscrewed, which makes them useful for test points and temporary closures. Socket weld caps are permanent.
Forged caps are made from ⅛" to 4" NPS. For larger pipe, buttweld caps to ASME B16.9 are used.
Yes. We supply forged caps for projects under the European Pressure Equipment Directive (PED 2014/68/EU), and with IBR certification for Indian boiler applications. NACE MR0175 / ISO 15156 compliant material is also available on request for sour service in the Middle East and the Americas.
