Spectacle Blinds Figure 8 Blinds for Piping Systems
As a custom shop, we engineer and supply precision-cut blind solutions for piping systems worldwide, built to any thickness, alloy, face, or coating you need.
Get a Quote or Order
Send us these details and we'll respond the same business day.
- Flange rating (150# to 2500#)
- Size (1/2" to 96")
- Thickness (Isolation, Hydro, Custom)
- Face type and finish
- Material
- Quantity and date needed
| Specification | Details |
|---|---|
| Sizes | 1/2" – 96" |
| Thickness Options | Isolation • Hydro • Custom |
| Rating Classes | 150# • 300# • 600# • 900# • 1500# • 2500# |
| Construction | One-Piece • Two-Piece |
| Stocked Alloys | 516-Gr70 CS • 304/316 SS (Any Available Alloy) |
| Materials Origin | USA |
| Face Options | Flat • Raised • RTJ Male • RTJ Female |
| Gasket Types | Oval • Octagonal |
| Finish Options | Serrated (125/250 RMS) • Mill |
| Coating Options | Various |
| Availability | Rent • Purchase |
What Is a Spectacle Blind?
A spectacle blind is a single machined piece with two discs joined by a web: one solid disc that blocks flow and one open disc that lets it through. It's installed between two flanges and stays in the line permanently. Rotating it switches the line between isolated and in service, with no separate paddle blind or spacer to handle or store.
Also known as:
What Are Spectacle Blinds Used For?
- Positive isolation: with the solid disc in the line, downstream equipment can be maintained without shutting down the whole system
- Repeated pressure testing: a permanent test point for hydrostatic or pneumatic testing that doesn't require installing a blind each time
- Frequent switching: lines that move between isolated and in service often, such as maintenance, commissioning, and turnaround tie-in points
Rotate to the open disc and the line returns to full flow. A spectacle blind is an isolation device, not a valve: it is either fully open or fully closed.
Spectacle Blind vs. Paddle Blind + Spacer
A spectacle blind combines a paddle blind and a spacer in one piece, but it isn't always the right choice. Use this to decide which fits your isolation point.
For paddle blind selection, see our Paddle Blinds page.
1. Thickness: Isolation vs. Hydro
Never hydrotest with an isolation-thickness blind. Required thickness depends on line size and flange class: look yours up on the Blind Thickness Chart, or call our technical team to confirm.
2. Face, Gasket & Finish
3. Material
Match the blind to the pipe material and process fluid to prevent galvanic corrosion. All raw materials are PMI verified.
NSF ANSI/CAN 61 certified for potable water. Applies exclusively to our stainless steel blinds, confirming no harmful contaminants leach into drinking water. View certified products
Webs Color-Coded by Class
The web is painted by flange rating so crews can confirm the class at a glance, and stamped with size, rating, and material.
Custom Configurations
Specify any of these when ordering and our engineering team will build to match your flange and pressure class.
Why USA Industries Spectacle Blinds
We are the actual manufacturer, not a distributor. We've built isolation blinds in-house since 1982, which means faster lead times, custom capability, and technical support from people who make the product, with 24/7/365 emergency service from S. Houston TX, Corpus Christi TX, Prairieville LA, and Broken Arrow OK.
Quick Finder
Spectacle Blind FAQ
Do I still need a spacer with a spectacle blind?
No. The open disc does the spacer's job. That's the main reason to choose a spectacle blind: one piece stays in the line instead of a paddle blind plus a spacer.
Can I rent spectacle blinds?
Yes. Rental and purchase are both available from every service center. See rentals.
Can you provide documentation proving material origin?
Yes. Mill test reports (MTRs) and country of origin documentation are available on request.
Why Choose USA Industries
From pipe blinds to heat exchanger tools, we deliver custom-engineered products with the fastest turnaround times in the industry.
Fastest Turnaround
Available 24/7 - 365 days a year with same-day shipping available on stock items. Custom orders in days, not weeks.
Direct Pricing
No middlemen markup. Buy direct from the manufacturer with 40+ years of industry excellence and save.
Custom Engineering
Custom solutions designed to your exact specifications.
ISO Certified Quality
A quality driven ISO 9001:2015 certified manufacturer ensures consistent excellence.
BBB A+ Rated
The highest grade awarded, signifying USAI operates with high integrity and a strong commitment to resolving customer issues.