Slip-On Flanges
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Slip-On Flanges
Stainless Steel Slip-On Flanges
Stainless Steel Slip-On Flanges slide over the end of a pipe and are fillet-welded both inside and outside, making them one of the quickest and most economical flanges to align and install. Their bore is slightly larger than the pipe's outer diameter, so the flange slips into position before welding.
Available with flat face, raised face and ring type joint (RTJ) facing, our slip-on flanges are manufactured in a wide range of stainless grades and stocked in sizes and pressure classes to suit most piping requirements. While they don't match the pressure and fatigue rating of a weld neck flange, their ease of installation makes them a popular, cost-effective choice across process industries.
Face Type Availability
- Flat Face Slip-On Flange
- Raised Face Slip-On Flange
- Ring Type Joint (RTJ) Slip-On Flange
- Plate Slip-On Flange
Slip-On Flange Specification
| Standards | ANSI B16.5, ASME B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, custom drawings on request |
|---|---|
| Size Range | ½" NB to 48" NB |
| Designation | ASTM/ASME A182 / A240, SA182 / SA240 |
| Pressure Class | 150, 300, 400, 600, 900, 1500, 2500 |
| Face Types | Flat Face (FF), Raised Face (RF), Ring Type Joint (RTJ) |
Available Grades
Stainless steel grades we manufacture and supply per ASTM A182 / A240.
- SS 304
- SS 304L
- SS 304H
- SS 309S
- SS 309H
- SS 310
- SS 310S
- SS 310H
- SS 316
- SS 316L
- SS 316H
- SS 316Ti
- SS 316LN
- SS 317
- SS 317L
- SS 321
- SS 321H
- SS 347
- SS 347H
- SS 201
- SS 202
- SS 410
- SS 430
- SS 446
- SS 904L
SS 304 vs SS 316 — Equivalent Grades
How our two most common grades map across international standards.
| Standard | SS 304 | SS 316 |
|---|---|---|
| Standard | SS 304 | SS 316 |
| Werkstoff Nr. | 1.4301 | 1.4401 |
| UNS | S30400 | S31600 |
| JIS | SUS 304 | SUS 316 |
| BS | 304S31 | 316S31 |
| GOST | 08Х18Н10 | — |
| AFNOR | Z7CN18-09 | Z7CND17-11-02 |
| EN | X5CrNi18-10 | X5CrNiMo17-12-2 |
Chemical Composition
SS 304 vs SS 316, % by weight.
| Element | SS 304 | SS 316 |
|---|---|---|
| Carbon (C) | 0.08 max | 0.08 max |
| Manganese (Mn) | 2 max | 2 max |
| Silicon (Si) | 0.75 max | 0.75 max |
| Phosphorus (P) | 0.040 max | 0.045 max |
| Sulphur (S) | 0.030 max | 0.030 max |
| Chromium (Cr) | 18 – 20 | 16 – 18 |
| Molybdenum (Mo) | — | 2 – 3 |
| Nickel (Ni) | 8 – 11 | 10 – 14 |
| Nitrogen (N) | — | 0.1 max |
Mechanical & Physical Properties
Typical values for SS 304 / SS 316 (UNS S30400 / S31600).
| Density | 8.0 g/cm³ |
|---|---|
| Melting Point | 1400 °C (2550 °F) |
| Tensile Strength | 75,000 psi (515 MPa) |
| Yield Strength (0.2% Offset) | 30,000 psi (205 MPa) |
| Elongation | 35% |
Types of Slip-On Flanges
- Plate Slip-On Flange
- Reducing Slip-On Flange
- Forged Slip-On Flange
- Square Slip-On Flange
- Ring Type Joint (RTJ) Slip-On Flange
- Class 125 Lightweight Slip-On Flange
Standards We Follow
- ANSI B16.5
- ASME B16.47 Series A
- ASME B16.47 Series B
- ANSI B16.36 Orifice Slip-On
- DIN Slip-On PN6 – PN40
Dimension & Weight Charts
Full ANSI/ASME B16.5 dimension and weight tables for Class 150 through Class 1500 are published on our Dimensions page as reference charts, to keep hundreds of rows of figures free of transcription errors.
Applications of Slip-On Flanges
Industries and equipment that rely on slip-on flanges for economical, easy-to-install connections.
- Offshore Oil Drilling
- Power Generation
- Petrochemicals
- Gas Processing
- Specialty Chemicals
- Pharmaceutical Equipment
- Chemical Equipment
- Sea Water Equipment
- Heat Exchangers
- Condensers
- Pulp & Paper Industry
Frequently Asked Questions
What is a Stainless Steel Slip-On Flange?
It is a flange that slips over the end of a pipe and is then fillet-welded both inside and outside for a secure, leak-tight joint.
How is a slip-on flange different from a weld neck flange?
A slip-on flange is easier and cheaper to align and install since it doesn't need to be butt-welded, but it has lower pressure and fatigue strength than a weld neck flange.
Which grades are available?
SS 304, 304L, 304H, 316, 316L, 316Ti, 317, 317L, 321, 347, 347H, 410, 430 and 904L, among other ASTM A182 stainless grades.
Which sizes and pressure classes are available?
We manufacture slip-on flanges from ½" NB to 48" NB across pressure classes 150 to 2500.
Which face types are offered?
Flat Face (FF), Raised Face (RF) and Ring Type Joint (RTJ) slip-on flanges are all available.
Need a Quote on Slip-On Flanges?
Share your size, grade and pressure class requirement and our team will get back to you with pricing and availability.