Carbon Steel ASTM A105 Blind Flange

QS Flange: CS 16Mn BL Flange

Forged ASTM A105 carbon steel blind flange, 1 inch 300LB, raised face to ASME B16.5, black anti-rust coated for small nozzles and utility lines.

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One-Minute Overview

Forged ASTM A105 carbon steel blind flange for a 1 inch flange joint.
300LB class with a raised face, machined to ASME B16.5.
Strong stiffness and good sealing from a forged rather than cast body.
Black anti-rust coating keeps the outside clean until installation.

The CS 16Mn BL flange is the 1 inch blind of this series: a solid disc that bolts across a joint and stops flow completely. The product page lists the part under the 16Mn designation and gives the material as carbon steel ASTM A105, so the two names describe the same forged blind here. Rated 300LB with a raised face and dimensioned to ASME B16.5, it seals against standard flanges of the same size and class without an adapter.

Name: CS 16Mn BL Flange
Size: 1 Inch
Pressure: 300LB
Material: Carbon Steel ASTM A105
Flange Face: Raised Face
Process: Forged Steel Flange
Coating: Black Anti-rust Coating
Standard: ASME B16.5

Small blinds do quiet work. A one inch disc closes instrument stubs, drain headers, sample points and the spare nozzles a vessel is built with for a sensor that arrives next year. Because the body is forged, the section behind the raised face is uniform and the plate does not spring as the bolts come down, which is what strong stiffness means in practice rather than on a data sheet. The 300LB class appears on utility and process lines around power stations and water conservancy works, and the same blind doubles as a test blank while a section is pressure tested.

Installation is a short job that is easy to get slightly wrong. Fit the gasket the service asks for, bring the bolts up in a star sequence and watch that the gap between the flanges stays even; a blind pulled down hard on one side will weep whatever gasket sits behind it. Wipe the seating band clean before the joint closes, and keep the blind face protected until the moment it goes in, because a 1 inch raised face picks up dents from a concrete floor faster than anyone expects.

FAQ

Q1. Do I really need a separate blind for a one inch stub?

If the stub has to be shut now and opened later, yes. A one inch blind bolts across the joint and comes off with a spanner, while a welded cap has to be cut away and the pipe end re-prepared. It is also the part an inspector expects on a spare nozzle, because the plate position can be seen from across the platform.

Q2. The model says 16Mn but the material says A105. Which one do I get?

Both designations appear on this product page: the blind is listed as CS 16Mn and the material field gives carbon steel ASTM A105. They describe the same forged blind in the series. Quote the designation your line class or your client's specification calls for when you enquire, and write it on the purchase order so the names are not swapped at the desk.

Q3. How hard should the bolts be pulled?

Hard enough that the gap closes evenly, and no harder than the gasket and bolt grade allow — a number that belongs to your piping specification, not to this page. Two or three passes in a star pattern beat one heroic pull every time. Anyone who has watched a 300LB joint bow has learned that lesson already.

Q4. What is the smallest order I can place?

Standard flange insulation gasket kits start at one set, and standard gaskets, studs, washers and sleeves start at one piece. Parts made to your drawing or to a non-standard bolt pattern are quoted one by one, because the minimum really depends on the material and the tooling involved.

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