SS 304 Slip-on FlangeASTM A182 · ASME B16.5 · Manufacturer, stockist & exporter, India
AISI 304 · UNS S30400 · SORF
An SS 304 slip-on flange is a flange that slides over the pipe and is fillet-welded inside and outside, made from SS 304 to ASTM A182 F304. Choose a slip-on flange for lower-pressure lines where easy alignment and lower cost matter more than fatigue strength. It needs less precise pipe cutting than a weld neck.
- ASTM A182
- ASME B16.5
- EN 10204 3.1 / 3.2
- Export packing
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is an SS 304 Slip-on Flange?
- What it is
- A flange that slides over the pipe and is fillet-welded inside and outside
- Material
- ASTM A182 F304
- Dimensions
- ASME B16.5 · EN 1092-1
- Grade
- SS 304 · UNS S30400
- Best at
- General corrosion resistance, food, water and architectural work
SS 304 Slip-on Flange Specification
| Product | SS 304 Slip-on Flange |
|---|---|
| Material standard | ASTM A182 F304 |
| Dimensional standard | ASME B16.5 · EN 1092-1 |
| Sizes | ½" – 24" (ASME B16.5) · 26" – 60" (ASME B16.47) |
| Pressure class | Class 150, 300, 400, 600, 900, 1500, 2500 · PN 6 – PN 100 |
| Facing | RF · FF · RTJ · tongue & groove |
| Bore | To match pipe schedule (state on order) |
| Testing | PMI · dimensional · NDT and IGC on request |
| Documents | EN 10204 3.1 · 3.2 with third-party inspection |
When to Choose a Slip-on Flange
Choose a slip-on flange for lower-pressure lines where easy alignment and lower cost matter more than fatigue strength. It needs less precise pipe cutting than a weld neck.
- Two fillet welds: one at the hub, one inside the bore
- Lower fatigue life than a weld neck in cyclic service
- Available with a hub or as a plate (hubless) design
More on choosing: Slip-on flange guide.
SS 304 Slip-on Flange: Why 304 for slip-on flanges
Choose a slip-on flange for lower-pressure lines where easy alignment and lower cost matter more than fatigue strength. It needs less precise pipe cutting than a weld neck. In SS 304, the choice usually comes down to the medium and temperature — the rows here are the points buyers check for this exact combination.
| Why this grade | Stainless flanges are chosen where carbon steel would rust or contaminate the process. SS 304 is picked for general corrosion resistance, food, water and architectural work. |
|---|---|
| Typical service | Food & dairy — Tanks, piping and equipment that must be cleaned daily. |
| B16.5 material group | 2.1 |
| Bolting | ASTM A193 B8 studs with A194 8 nuts |
| Welding to carbon steel | ER309L (or E309L electrode) is the usual filler when joining it to carbon steel |
| Matching filler | ER308 / ER308L (AWS A5.9) |
SS 304 Slip-on Flange Chemical Composition
Under technical review for TDS.
| Element | Current requirement |
|---|---|
| Chromium | As specified |
| Nickel | As specified |
| Carbon | As specified |
| Manganese | As specified |
| Silicon | As specified |
| Nitrogen | As specified |
| Phosphorus | As specified |
| Sulphur | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification to be verified: ASTM A240 for UNS S30400.
SS 304 Slip-on Flange Mechanical Properties
Under technical review for TDS.
| Property | Current requirement |
|---|---|
| Tensile strength | As specified |
| Yield strength 0.2% | As specified |
| Elongation | As specified |
| Hardness | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification and condition to be verified: ASTM A240 for UNS S30400 — Annealed plate & sheet.
Full chemistry, properties and equivalents are on the SS 304 grade page.
Other SS 304 flanges
SS 304 Slip-on Flanges for export
FOB / CIF · Nhava Sheva (JNPT), MumbaiSS 304 Slip-on Flange dimensions — ASME B16.5 Class 150 & 300
Outside diameter, thickness and bolting are set by size and class. Values in mm; thickness excludes the 1.6 mm raised face.
| NPS | Cl 150 OD | Cl 150 thickness | Cl 150 bolt circle | Cl 150 bolts | Cl 300 OD | Cl 300 thickness | Cl 300 bolt circle | Cl 300 bolts |
|---|---|---|---|---|---|---|---|---|
| ½" | 90 | 9.6 | 60.3 | 4 × ½" | 95 | 12.7 | 66.7 | 4 × ½" |
| 1" | 110 | 12.7 | 79.4 | 4 × ½" | 125 | 15.9 | 88.9 | 4 × ⅝" |
| 1½" | 125 | 15.9 | 98.4 | 4 × ½" | 155 | 19.1 | 114.3 | 4 × ¾" |
| 2" | 150 | 17.5 | 120.7 | 4 × ⅝" | 165 | 20.7 | 127.0 | 8 × ⅝" |
| 3" | 190 | 22.3 | 152.4 | 4 × ⅝" | 210 | 27.0 | 168.3 | 8 × ¾" |
| 4" | 230 | 22.3 | 190.5 | 8 × ⅝" | 255 | 30.2 | 200.0 | 8 × ¾" |
| 6" | 280 | 23.9 | 241.3 | 8 × ¾" | 320 | 35.0 | 269.9 | 12 × ¾" |
| 8" | 345 | 27.0 | 298.5 | 8 × ¾" | 380 | 39.7 | 330.2 | 12 × ⅞" |
| 10" | 405 | 28.6 | 362.0 | 12 × ⅞" | 445 | 46.1 | 387.4 | 16 × 1" |
| 12" | 485 | 30.2 | 431.8 | 12 × ⅞" | 520 | 49.3 | 450.8 | 16 × 1⅛" |
Full chart: ASME B16.5 flange dimensions.
SS 304 Slip-on Flange — questions buyers ask
Slip-on or weld neck — which is stronger?
The weld neck. A slip-on flange is fine for moderate pressure and temperature, but in cyclic or severe service engineers specify weld neck flanges.
What pressure rating does a SS 304 slip-on flange have?
It depends on class and temperature. SS 304 forgings are in ASME B16.5 material group 2.1; read your class column in that group's table at the design temperature.
Can SS 304 slip-on flanges be welded to carbon steel?
Yes — ER309L (or E309L electrode) is the usual filler when joining it to carbon steel.
Which standard covers SS 304 slip-on flanges?
The material is ASTM A182 F304; dimensions follow ASME B16.5 · EN 1092-1. Always state both on your purchase order, with the edition if your project specifies one.
What decides the price of a SS 304 slip-on flange?
The alloy price, the size and pressure 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