Engineered to Seal
Blind Flanges, Custom Flanges & Solutions
Seal pipeline endpoints with pressure-rated blind flanges designed for isolation, pressure testing, and system termination. Custom-machined configurations tailored to your specifications, plus carbon steel inventory spanning ASME B16.5, ASME B16.47, AWWA C207, and API standards. Every flange supplied with full traceability and pressure-rating certification.
Blind Flanges and Spectacle Blinds
A blind flange is a solid steel disc with no bore. ASME B16.5 covers blinds through NPS 24. ASME B16.47 covers large-diameter blinds and weld necks from NPS 26 to 60. Texas Flange machines blinds and custom flanges to 203 inches, with MTRs, for oil and gas and other industrial service, in carbon, stainless, and alloy.
This page is the type. It is not a replacement for the dimension tables. If you need OD, bolt circle, hole count, or thickness, open the live Class 150, Class 300, or Class 600 table on texasflange.com.
What the disc does
Most flanges exist so fluid can pass through a bolted joint. A blind stops that. It caps a pipe end, a vessel nozzle, or a spare opening you will tie into later. Buyers also use it for hydrotest and for a section that has to be positively closed without welding a cap onto the pipe.
No bore means more steel in the disc than the matching weld neck or slip-on of the same NPS and class. The shop work is simpler. The handling is not. We machine standard blanks to bolt to the weld neck or slip-on already in the line. We also machine a center NPT, a custom bore, or a high hub when the spec says so. API 6BX blinds often require the high hub. A hubbed blind is still a closure, not a weld neck.
Facing has to match the mate. Raised face and flat face cover most process joints. Ring-type joint (RTJ) is a machined groove and a metal ring gasket. If the line is RTJ, the blind is RTJ. An RF disc on an RTJ flange will not seal. RTJ is a facing on this part, the same as RF or FF. It is not a different flange type.
Spectacle blinds are a different part
A spectacle blind is not a blind flange. It is an ASME B16.48 line blank: two discs on a web, one solid, one bored. Leave it between two flanges. Blank in the bore, the line is isolated. Rotate it 180 degrees, flow is open. Figure-8 blank is the same geometry. Paddle blinds and spacers are the removable pair: one solid plate with a handle, one spacer. Store them as a set.
Spec the spectacle to the flange it sits in. NPS, class, B16.5 or B16.47 Series A or B, face, bore, grade. Thickness follows class. A Class 150 spectacle in a Class 300 joint is the wrong plate. B16.48 runs NPS 1/2 through 24, Classes 150 through 2500. Past that, or off-pattern, send the print. We machine the blank. We do not write the isolation procedure.
What we make
We machine B16.5 blinds, B16.47 large blinds, spectacles and paddles, and custom discs out to 203 inches. Carbon, stainless, alloy. MTRs with the order. One-offs are normal on customs. Give us OD, ID, thickness, bolt pattern, and grade when it is not a table size.
Live dimension tables — use these for numbers:
What We Supply
From blind flange sealing solutions to fully custom solutions, our product portfolio spans every major standard and application.
Blind Flanges
Seal off pipe endpoints for isolation, hydrostatic testing, or system termination. Produced to ASME B16.5 and ASME B16.47 specifications, AWWA C207 for water service, and custom sizes from ½" to 60" with full traceability. Rated for all standard pressure classes with dimensional precision on every face.
View Details →Custom Flanges
Non-standard bores, special facings, overbore specifications, and proprietary designs. Custom-machined flanges sourced from qualified suppliers. Drawings, sketches, or performance requirements all accepted. Delivered to spec on time.
View Details →Carbon Steel Flanges
Full inventory of ASTM A105, A350 LF2, A694 grades in weld neck, slip-on, blind, threaded, socket weld, and lap joint configurations. Every piece comes with complete Material Test Reports and pressure-temperature cross-reference data. Stock and custom lead times available.
View Details →Built to Code. Every Time.
Every flange engineered for compliance with international standards and backed by complete documentation.
ASME B16.5
Pipe flanges 1/2" through 24"
ASME B16.47
Large diameter flanges 26" and up
AWWA C207
Water and wastewater service
ANSI B16.1
Cast iron pipe flanges
DIN/EN 1092
European metric flanges
ASME B16.9
Factory welded fittings
ASME B16.11
Forged steel fittings
NACE MR0175
Sour service materials
Why Choose Us
Full MTR Traceability
Complete Material Test Reports with chemical composition, mechanical properties, and heat number documentation for every flange.
Pressure-Rated Right
Flanges supplied with pressure-temperature certification cross-referenced against ASME P-T tables.
Dimensional Accuracy
Bolt holes, face runout, bore diameter, and flange thickness measured and certified within specification tolerances.
Rapid Turnaround
Stock inventory for immediate shipment on standard sizes. Industry-leading turnaround on custom orders. Call (281) 484-8325 for project-specific timelines.
Domestic & Import Options
Buy American certified melts available. Competitive pricing on foreign sourcing when beneficial for your project.
Specialty Materials
Duplex, super-duplex, Inconel, Monel, Hastelloy, chrome-moly, and exotic alloys for corrosive and high-temperature service.
Industries Served
Trusted by operators across every major industrial sector.
Oil & Gas
Power Generation
Chemical Processing
Pulp & Paper
Food & Beverage
Data Centers
Common Flange Types Quick Reference
Fast lookup for the most common configurations and their applications.
Blind
Solid disc that seals a pipe end. Can be machined into instrumentation flanges (NPT taps), reducing flanges, vent/restriction flanges, or high-hub variants for end-user instrumentation modification.
Weld Neck
Tapered hub butt-welded to matching pipe schedule; highest strength and the default for critical and high-pressure service.
Slip-On
Slides over the pipe OD and is double-fillet welded; lower strength than weld neck but easier to align.
Threaded
Internally threaded (NPT/BSP) only; screws onto a threaded pipe end and is reversible without cutting.
Socket Weld
Has a counterbore in the center; the pipe end fits INTO the socket and is fillet welded around the OD. Used in compact, small-bore service.
Lap Joint
Loose backing flange used with a separate stub end; allows quick disassembly and reuse of the backing flange.
Orifice
Carries pressure-drop measurement taps; integral or removable plates for flow metering.
Long Weld Neck
Straight-hub welding flange per ASME B16.5 sec 2.8; available as LWN, Heavy Barrel, and Equal Barrel sub-styles for tank/vessel nozzle service.
How We Work
Submit Specs
Provide your specifications, drawings, or performance requirements.
Review & Quote
Our engineers review your needs and provide a detailed quote.
Production & QC
Sourced to spec with full inspection and material documentation.
Delivery
Ship with complete MTRs and pressure-rating certification.
Technical Resources
Reference materials and guides to support flange selection and engineering.
Frequently Asked Questions
Common questions about our blind flanges, custom solutions, and standards compliance.
Need Flanges? Let's Talk.
Our flange specialists are ready to discuss your specifications, timeline, and budget. Contact us today for a detailed quote.
Call us today or submit your specifications online for immediate assistance.