A-A-52444 Gaskets: Combination Of Metal And Nonasbestos Facing Material (Metric)This CID covers three types of combination gaskets made from a combination of metal and nonasbestos facing material. These combination gaskets are used in automotive vehicle engine applications where they will be subjected to high temperatures as in cylinder heads and exhaust manifolds. The combination gaskets are referred to herein as "gaskets".

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A-A-52444A

3.1.2 Steel strip. Steel strip shall conform to ASTM A109/ A109M for low carbon (0.15% maximum), cold-rolled, temper 4 or 5, matte (dull) finish steel.

3.1.3 Long terne steel sheet. Long terne steel sheet shall conform to ASTM A308/ A308M for commercial quality, oiled, coating designation LT35 steel.

3.1.4 Tin plate. Tin plate shall conform to ASTM A623 for steel as base metal (Type-optional), tin coating weight designation 25, temper designation T-4, box annealed tin plate.

3.1.5 Copper sheet. Copper sheet shall conform to ASTM B152/ B152M for cold-rolled, soft anneal designation O60 copper.

3.1.6 Other metals. When specified (see 7.2), other metals may be used in the fabrication of gaskets.

3.2 Design and construction. The details of design and construction (e.g., configuration, size, dimensions) shall be in accordance with the applicable engineering drawing (AED) (see 7.2).

3.2.1 Type I gaskets. Type I gaskets shall be made from steel, sheet or strip, as specified under 3.1.1 through 3.1.4 and nonasbestos material on both surfaces. Type I gaskets shall have the steel sheet recessed and formed so as to have closely spaced tangs projecting from both surfaces. The tangs shall hold the nonasbestos materials to the metal after being pressed. When required to prevent delamination, adhesives may be used. The nonasbestos material shall be plied evenly on both surfaces of the metal with the same thickness on each surface.

3.2.2 Type II gaskets. Type II gaskets shall be made from steel sheet as specified in 3.1.3 or 3.1.4 and nonasbestos material on one surface. The type II gaskets shall have the steel sheet recessed and formed so as to have closely spaced tangs projecting from one surface only. The tangs shall hold the nonasbestos material to the metal after being pressed. When required to prevent delamination, adhesives may be used. The nonasbestos material shall be plied evenly on one surface and shall be uniform in thickness. The sheet metal shall be formed to protect the outer edges of the gasket but shall not be closed over the nonasbestos material at the outer edges.

3.2.3 Type III gaskets. Type III gaskets shall be made from nonasbestos material sheathed on both faces with metallic sheets as specified in 3.1.3, 3.1.4 or 3.1.5. Metallic grommets shall band the gasket, as specified in the AED. Adhesives shall not be used. The metallic sheets shall be formed to protect the outer edges of the gasket but shall not be closed over the nonasbestos material at the outer edges.

3.2.4 Grommets. Grommets used to fabricate type III gaskets shall be made of material as specified in the AED and, if not specified, in accordance with the manufacturer’s specifications/ drawings.