# Slip-on flange

> Forged slip-on flanges to ASME B16.5 in A105 and A182 grades, raised or flat face, and what to state when you request slip-on flanges for a quote.

URL: https://jjprojectsok.com/products/steel-structural/flange-slip-on  
Español: https://jjprojectsok.com/es/products/steel-structural/flange-slip-on  
Updated: 2026-10-16

Forged flange that slides over the pipe and is fillet welded, easier to align than a weld neck flange.

**In short:** Forged flange that slides over the pipe and is fillet welded, easier to align than a weld neck flange. JJ Projects sources it to the specification the buyer names. Typical reference, standards: ASME B16.5.

## Specification references

- Standards: ASME B16.5
- Materials: ASTM A105, A182 (alloy and stainless)
- Face: Raised face or flat face
- Class: As specified in ASME B16.5 for the size

> Typical references only. The governing specification is the one on your purchase order or datasheet.

## Typical uses

- Water, air, cooling and other utility piping
- Low and moderate pressure process lines where the piping specification permits slip-on flanges
- Joints where easy alignment matters during fit-up
- Connections to flat-face equipment flanges, using flat-face slip-ons

## What to include in a request

A request with these details can be quoted without a round of questions. Send what you have and we will ask for the rest.

1. NPS and pressure class under ASME B16.5
2. Facing: raised face or flat face
3. Material and grade, for example ASTM A105 or A182 F304L
4. Pipe outside diameter or NPS, since the bore is larger than the pipe it slides over
5. Quantity
6. Documents: material test report and any marking requirement
7. Confirm the piping specification allows slip-on flanges for the service

[Request this item](https://jjprojectsok.com/request-a-quote?item=flange-slip-on)

## Questions

### Can slip-on flanges be used in any service?

Not always. Many piping specifications restrict slip-on flanges by pressure class, temperature or fluid, and prefer weld neck flanges for severe, cyclic or hazardous service. Check your piping class before ordering.

### How is a slip-on flange welded to the pipe?

The pipe is inserted into the flange and joined with fillet welds, normally at the hub and at the face side as the welding procedure requires. Weld details belong to your fabrication procedure, not to the flange order.

## Related items

- [Weld neck flange](https://jjprojectsok.com/products/steel-structural/flange-weld-neck): Forged weld neck flanges to ASME B16.5 and B16.47 in A105, A350 LF2 and A182 grades, and what a flange request needs to state to be quoted properly.
- [Blind flange](https://jjprojectsok.com/products/steel-structural/flange-blind): Forged blind flanges to ASME B16.5 and B16.47 in A105 and A182 grades, Class 150 to 2500, and what to include in a blind flange request for a quote.
- [Stud bolt with nuts](https://jjprojectsok.com/products/steel-structural/stud-bolt): Stud bolts with heavy hex nuts: ASTM A193 B7, B8M and L7 studs with A194 2H nuts for flanged joints, and what to state in the request so it can be quoted.
- [Spiral-wound gasket](https://jjprojectsok.com/products/steel-structural/spiral-wound-gasket): Spiral-wound gaskets to ASME B16.20 with 304 or 316L winding and graphite or PTFE filler, for raised-face flanges, with request details needed to quote.

## Guides

- [Flange pressure classes: ASME B16.5 and B16.47](https://jjprojectsok.com/knowledge/flange-pressure-classes): How ASME flange classes 150 to 2500 work: B16.5 vs B16.47, pressure-temperature ratings, facings RF, FF and RTJ, flange types and common materials.
- [Stud bolts and gaskets: ASTM A193 and A320](https://jjprojectsok.com/knowledge/stud-bolts-and-gaskets): How to specify flange bolting and gaskets: ASTM A193 B7, B7M, B8, A194 2H and 2HM nuts, A320 L7, coatings and spiral-wound gaskets to ASME B16.20.

[All steel and structural](https://jjprojectsok.com/products/steel-structural)