SS 321 NippleASTM A182 · MSS SP-95 · Manufacturer, stockist & exporter, India
AISI 321 · UNS S32100
An SS 321 nipple is a short length of pipe, threaded or plain, used to connect fittings, made from SS 321 to ASTM A182 F321. Pipe nipples connect valves and fittings in small-bore lines. Swage nipples (MSS SP-95) also change size between their two ends.
- ASTM A182
- MSS SP-95
- EN 10204 3.1 / 3.2
- Export packing
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is an SS 321 Nipple?
- What it is
- A short length of pipe, threaded or plain, used to connect fittings
- Material
- ASTM A182 F321
- Dimensions
- MSS SP-95 · ASME B36.10 / B36.19
- Grade
- SS 321 · UNS S32100
- Best at
- High-temperature service between 425 and 815 °C
SS 321 Nipple Specification
| Product | SS 321 Nipple |
|---|---|
| Material standard | ASTM A182 F321 |
| Dimensional standard | MSS SP-95 · ASME B36.10 / B36.19 |
| Sizes | ⅛" – 4" (ASME B16.11) |
| Wall / class | Class 2000 / 3000 / 6000 / 9000 |
| Ends | Socket weld · NPT threaded |
| Testing | PMI · dimensional · NDT and IGC on request |
| Documents | EN 10204 3.1 · 3.2 with third-party inspection |
When to Choose a Nipple
Pipe nipples connect valves and fittings in small-bore lines. Swage nipples (MSS SP-95) also change size between their two ends.
- Close, short and long lengths
- Swage nipples to MSS SP-95
- Threaded both ends, one end, or plain
SS 321 Nipple Chemical Composition
| Element | Weight % |
|---|---|
| Chromium | 17.0 – 19.0 |
| Nickel | 9.0 – 12.0 |
| Titanium | 5 × (C + N) min, 0.70 max |
| Carbon | 0.08 max |
| Manganese | 2.00 max |
| Silicon | 0.75 max |
| Nitrogen | 0.10 max |
| Phosphorus | 0.045 max |
SS 321 Nipple Mechanical Properties
| Annealed plate & sheet | Value |
|---|---|
| Tensile strength | 515 MPa · 75 ksi |
| Yield strength 0.2% | 205 MPa · 30 ksi |
| Elongation | 40% |
| Hardness | 217 HB max |
Full chemistry, properties and equivalents are on the SS 321 grade page.
Other SS 321 pipe fittings
SS 321 Nipple — questions buyers ask
What is a swage nipple?
A nipple that reduces from one size to another, concentric or eccentric, to MSS SP-95.
Which standard covers SS 321 nipples?
The material is ASTM A182 F321; dimensions follow MSS SP-95 · ASME B36.10 / B36.19. Always state both on your purchase order, with the edition if your project specifies one.
What decides the price of a SS 321 nipple?
The alloy price, the size and schedule or class, quantity, and the testing and documents required. Send your list and we quote the same working day.
What documents do you supply?
EN 10204 3.1 mill certificates as standard, 3.2 with third-party inspection on request, plus dimensional and PMI reports.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026