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Flatness tolerance



Some of our customers often wonder about flatness being an issue with regards to aligning flanges properly on their equipment, or for the purposes of general aesthetics/symmetry for non-industrial applications.  To the best of our knowledge, there is no flatness tolerance in any published flange specification.  Since flanges are made on lathes from oversized forgings, the probability of having an issue is near zero.  That said, one can take a micrometer and check the thickness in multiple places against published thickness tolerances to “flunk” a flange whose flatness is seriously in question. Texas Flange has never had an issue with flatness for any flanges we have supplied to our customers.


In some instances, it is important to take flatness into consideration when machining to certain dimensions.  This is almost exclusively a concern when a customer requires a large OD flange made to a very minimal thickness.  As an example, if a customer requires a custom ring flange of a 60” diameter made to a half inch thickness, we would not offer machining across the face due to the likelihood of “waffling,” but would offer mill finished from plate. This is essentially an attempt to reduce an issue with flatness for the finished/shipped product flange, and also to ensure the face finish is out of code. In these extreme cases, Texas Flange may propose that your facing is done with Blanchard grinding or some alternative to the typical symmetry of a 125-250 RMS, so that although the industrial standard for face finish is not practically achievable in this particular application, an asymmetric machine finish is provided in order to accommodate the friction needed in the gasket sealing process of your installation.


Texas Flange is always trying to be of the best service to our customers.


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Studding Outlet or Pad Flanges

 studding outlets

Studding outlet flanges (also known as outlet flanges, stud pads, or pad flanges) are made to order items offered in a variety of configurations. The most commonly used studding outlet flange in the industry is the flat bottom type. We also offer them in a shell mount, head mount, or alternate radius in order to set the flanges flush with your tank or vessel. Just let us know the radius and type of mount required and we will provide these flanges according to your application. The least common outlet flange is the tangential mount, which is offset from a center line and therefore lacks symmetry. We provide these outlet flanges according to your submitted drawing, and although the mount detail is a bit more complex, this typically does not affect the lead time in comparison to the other styles.

The majority of outlet flanges have tapped holes as opposed to thru holes. The raised face is standard as with ASME/ANSI flanges, but flat face and RTJ/groove facing is available upon request.  Studding outlet flanges come in any material as “normal” flanges, especially in grades ASTM A105 forged carbon steel, A350 LF2 low temp carbon steel, and forged stainless steel grades ASTM F304/L and F316/L. We can also provide these in special alloys as necessary. Give us a call or shoot us an email with your inquiry so we can provide you with the studding outlet flanges you need as fast as possible!

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How do I know I’m getting flanges in the grade of material I ordered?

All Texas Flange products come with heat codes for traceability.  Each code references a “heat”; a single grouping of forgings created from the same piece of billet in one forging session. Essentially, the heat code is the “DNA” or “fingerprint” of sorts for our products, used to identify the physical and chemical composition of our flanges or custom components. During a forging, an extra piece, often referred to as the “test piece” or “coupon”, is forged to obtain physical traits via “crashing” or destructive testing per ASME code. Chemistry values include the percentage of alloying elements such as Carbon, Chromium, Nickel, Sulfur, Phosphorus, Aluminum, and other alloys. Physical values are provided on Material Test Reports (MTRs) with respect to the requirements of the material. As an example, some flanges undergo heat treatment processes like normalization or quenching and tempering, and as ASME flanges in pressure classes 400# and above require ASTM A105 carbon steel flanges to be heat treated automatically per code, this information would be included in the report.

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All the information is printed on a Material Test Report that certifies the flange material to the appropriate ASTM/ASME specification. Here at Texas Flange we provide all flanges or other components with MTRs per EN10204 3.1* at no additional charge. MTRs are shipped with your order or emailed directly to you at your request once the order is completed. Additionally, if you should want or need a Certificate of Conformance go with your order, we will provide this free of charge as well. Our number one focus is making sure you get the flanges you need per your requirements Quality is critical in our service of providing materials for pressure vessels, refineries, offshore and onshore rigs, pipelines, and a seemingly endless number of alternate industrial applications. We take that responsibility very seriously.  



Give us a call at 281-484-8325 or shoot us an email at This email address is being protected from spambots. You need JavaScript enabled to view it. with any questions or concerns on your order.



Don't forget to check out our other free online resources!



Flange Charts/Tables

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Texas Flange means quality industrial flanges.

flanges, flange, ansi, pipe, fittings, awwa, carbon, blind, petrochemical, industrial, waterworks, stainless, steel, asme, api, weld, forgings, orifice, slip, industrial flange, industrial flanges



Texas Flange offers an extensive range of industrial flanges and fittings. Our clients utilize these flanges in various industries, including offshore and onshore petrochemical, waterworks, pressure vessel, and construction, to name a few. All of our flanges are fabricated using ASTM, ASME, and AISI grade steels and alloys to ensure quality, durability, and compliance with the latest specifications in each industry.  A sample CAD drawing for an 8” 300# weld neck flange which we recently provided in grade 2205 Duplex Stainless Steel for use in a refinery can be found here. These updated flange models posted last year are very popular with engineers, draftsmen, and sales/purchasing agents and have proven quite effective in assisting our customers with their flange requirements. Note that we also provide custom flange templates for your own utilization, should you require a weld neck flange with a custom bore size or a special facing outside of typical ANSI established dimensions.   Please feel free to contact us with your flange inquiry via email, fax, or phone.

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Texas Flange does the 11th Annual Pear Run

Texas Flange has been doing the following as a group for the last couple years. Wanted to open it up to our customers and suppliers. If any of you want to join the Texas Flange Runners team we will cover the registration:



May 9, 2015 Presented by PCPAAA


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