OEM manufacturer MSS SP-95 · ASME B1.20.1 · ASME B16.25
Swage Nipples — Concentric & Eccentric, MSS SP-95
A swage nipple is a reducing fitting with male ends that joins a larger pipe to a smaller one, often across different end types. Teshi Group manufactures concentric and eccentric swage nipples to MSS SP-95 with bevelled, plain or threaded ends in any combination.
Also called: swaged nipple, swage, concentric swage nipple, eccentric swage nipple, pipe swage
What is a Swage Nipple?
A swage (swaged) nipple is a male-ended reducing fitting covered by MSS SP-95 in NPS ¼" to 12". Unlike a butt weld reducer, its ends can differ: for example bevelled large end for butt welding and threaded small end for a screwed valve or socket weld fitting. It is used to step down from a butt weld main line to small-bore socket weld or threaded branches. MSS SP-95 identifies swage nipples by wall thickness and material grade rather than a pressure class, and also covers bull plugs.
Key features
- Concentric and eccentric types per MSS SP-95
- End combinations: BLE × TSE, BBE, PBE, TBE and others
- Identified by schedule/wall thickness and material, not pressure class
- Threaded ends NPT to ASME B1.20.1; bevels to ASME B16.25
- Bull plugs (male closures) also covered by MSS SP-95
Specification
| Supply | OEM manufacturer — Teshi Group, India |
|---|---|
| Standard | MSS SP-95 |
| Size range | Swage nipples and bull plugs NPS ⅛"–12" (DN 6–300) |
| Types | Concentric and eccentric |
| End types | Threaded, bevelled, plain (square cut) or grooved, in any combination |
| Wall thickness | By schedule of each end — Sch 40, 80, 160, XXS and others |
| Materials — carbon steel | ASTM A234 WPB, WPC (seamless and welded WPB-W) |
| Materials — high-yield carbon steel | ASTM A860 WPHY 42, 46, 52, 56, 60, 65, 70 (MSS SP-75) |
| Materials — low-temperature carbon steel | ASTM A420 WPL3, WPL6, WPL8, WPL9 |
| Materials — alloy steel (Cr-Mo) | ASTM A234 WP1, WP5, WP9, WP11 Cl 1 / 2 / 3, WP12 Cl 1 / 2, WP22 Cl 1 / 3, WP91, WP92 |
| Materials — stainless steel | ASTM A403 WP304, WP304L, WP304H, WP309, WP310S, WP316, WP316L, WP316H, WP316Ti, WP317, WP317L, WP321, WP321H, WP347, WP347H (seamless S, welded W / WX) |
| Materials — 904L and 6Mo | 904L (UNS N08904, ASTM A403 / B366); 254 SMO / 6Mo (ASTM A403 WPS31254); AL-6XN (UNS N08367, ASTM B366) |
| Materials — duplex stainless steel | ASTM A815 WPS31803, WPS32205 (2205) |
| Materials — super duplex stainless steel | ASTM A815 WPS32750 (2507), WPS32760, WPS32550 |
| Materials — nickel alloys | ASTM B366: Nickel 200 / 201 (N02200 / N02201), Monel 400 (N04400), Inconel 600 (N06600), Inconel 625 (N06625), Incoloy 800 / 800H / 800HT (N08800 / N08810 / N08811), Incoloy 825 (N08825), Hastelloy C276 (N10276), Hastelloy C22 (N06022), Hastelloy B2 / B3 (N10665 / N10675), Alloy 20 (N08020) |
| Materials — titanium | ASTM B363 WPT1, WPT2, WPT7, WPT12; Grade 5 (Ti-6Al-4V) against order |
| Materials — copper-nickel | Cu-Ni 90/10 (UNS C70600) and 70/30 (UNS C71500), made from ASTM B466 / B467 pipe (EEMUA 146 dimensions on request) |
| Grade availability | Every grade listed is made or supplied against order, with EN 10204 3.1 certificates (3.2 / third-party inspection when specified) and PMI on alloy, stainless, duplex and nickel grades. |
| Testing | Visual, dimensional and thread/socket gauge inspection; PMI on alloy and stainless grades; hardness check; MPI/DPT when specified |
| Documents | EN 10204 3.1 mill test certificate; 3.2 / third-party inspection when the order specifies; dimensional inspection report; IBR certification for boiler/steam service when specified |
Applications
- Step-down from butt weld headers to socket weld or threaded branches
- Instrument and gauge connections
- Drain and vent assemblies
- Wellhead and oil & gas hook-ups
- Valve installations needing a size change
Swage nipple vs butt weld reducer
A B16.9 reducer has two bevelled ends and is welded to pipe on both sides. A swage nipple is longer and can have different ends — for example bevelled on the large end and threaded on the small end — so it can link a butt weld line to a screwed or socket weld fitting. Swages are typically used for small-bore transitions; reducers for larger lines.
Technical data sheets
FAQ
Swage Nipple: common questions
What do BLE, TSE and PBE mean on a swage nipple?
They describe the ends: BLE is bevel large end, TSE is thread small end, PBE is plain both ends, and BBE is bevel both ends. Combine them to describe each end.
Do swage nipples have a pressure class?
No. MSS SP-95 identifies swage nipples by pipe wall thickness (schedule) and material grade instead of a pressure rating. Specify the schedule of each end.
What is the size range of MSS SP-95?
MSS SP-95 covers swaged nipples from NPS ⅛" to 12" and bull plugs from NPS ⅛" to 12", in both concentric and eccentric forms for swaged nipples.
Are eccentric swage nipples available?
Yes. Both concentric and eccentric swage nipples are covered by MSS SP-95. Eccentric swages keep one side flat and are used on horizontal lines where trapping must be avoided.
Need a size or grade not listed here?
Our engineering team manufactures against your drawing or datasheet, with dimensional sign-off before dispatch.
Send us your specificationTraceability
From mill heat to your site
- 01
Approved mill material
Received against the mill certificate; heat number registered.
- 02
Forging & machining
Heat number carried through every stage in our Indian works.
- 03
PMI, dimensional & NDT
Every lot inspected to the governing standard; TPI witness on request.
- 04
Stamped & certified dispatch
Hard-stamped pieces with EN 10204 3.1 / 3.2 certificates.
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