# Blind flange

> 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.

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

Solid flange with no bore, used to close the end of a line, nozzle or valve.

**In short:** Solid flange with no bore, used to close the end of a line, nozzle or valve. JJ Projects sources it to the specification the buyer names. Typical reference, standards: ASME B16.5 (to NPS 24), ASME B16.47 (larger sizes).

## Specification references

- Standards: ASME B16.5 (to NPS 24), ASME B16.47 (larger sizes)
- Materials: ASTM A105, A182 (alloy and stainless)
- Class and face: Class 150 to 2500; raised face or ring-type joint

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

## Typical uses

- Closing the end of a line, a spare nozzle or a valve
- Provision for future expansion, kept blanked until needed
- Pressure testing of piping systems and equipment
- Closing manway and inspection nozzles where the design uses a flanged cover

## 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
2. Standard: ASME B16.5 up to NPS 24, ASME B16.47 Series A or B above that
3. Facing: raised face or ring-type joint, with the groove type if ring-type joint
4. Material and grade, for example ASTM A105 or A182 F316L, plus any low-temperature requirement
5. Quantity, and whether any need drilled and tapped holes or a lifting lug
6. Documents: material test report and marking requirements

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

## Questions

### Does a blind flange need a pipe schedule?

No. A blind flange has no bore, so only the NPS, pressure class, facing and material are needed. Its thickness follows the standard for the size and class.

### Can I use a blind flange to isolate a line for work on equipment?

A blind flange closes the end of a line. Isolation for maintenance is governed by your site isolation procedure, which may call for a spectacle blind or a spade as well. Follow that procedure, not the flange alone.

## 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.
- [Slip-on flange](https://jjprojectsok.com/products/steel-structural/flange-slip-on): 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.
- [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.
- [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.

## 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)