1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Revisions 2002 09 19 Revised Updated and renumbered 1978 04 28 Metricated and Retyped CAH1-RD572066-21 1963 06 05 Released AS1 #915 Printed copies are uncontrolled Page 1 of 2 Copyright 2002, Ford Global Technologies,
2、 Inc. STEEL FASTENERS - HEAT TREATED ESB-M1A93-A ESB-M1A94-AESB-M1A95-A 1. SCOPE The materials defined by these specifications are heat treated spring steel fasteners. ESB-M1A93-A Highly Stressed Push on Type Highly Stressed Screw Receiving Type ESB-M1A94-A Highly Stressed Screw Receiving Type ESB-M
3、1A95-A Stressed Screw Receiving Type Stressed Self Threading Type 2. APPLICATION These specifications were released originally for spring steel fasteners used in assembly operations. 3. REQUIREMENTS 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform
4、 to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.2 CHEMICAL COMPOSITION ESB-M1A93-A ESB-M1A94-A ESB-M1A95-A Carbon 0.55 - 0.75 0.45 - 0.61 Manganese 0.60 - 0.90 0.30 - 0.94 Sulfur 0.05 max 0.05 max Phosphorus 0.04 max 0.04 maxSilicon 0.15 - 0.30 0.15 - 0.30 ENGINEE
5、RING MATERIAL SPECIFICATION ESB-M1A93-A ESB-M1A94-A ESB-M1A95-A Page 2 of 2 Copyright 2002, Ford Global Technologies, Inc. 3.3 ROCKWELL HARDNESS “C“ “A“ “15N“ “30N“ ESB-M1A93-A 45 50 73 76 83 - 85.5 64-68.5 ESB-M1A94-A 39 45 70 - 73 80 83 58.5 - 64 ESB-M1A95-A - - - 50 - 70 Hardness may be tested by
6、 using any of the above Rockwell scales. However, in cases of dispute between the suppliers and the Ford Motor Company, the following shall be used: 0.017 in (0.43 mm) and above: Rockwell “30N“ Below 0.017 in (0.43 mm): Rockwell “15N“ Hardness is to be checked on a smooth surface after all the finis
7、hing coat and skin have been removed. 3.4 HEAT TREATMENT All fasteners are to be heat treated by heating to a minimum temperature of 790 C, quenching in oil and drawing at a minimum temperature of 345 C. The resulting microstructure shall show a fully quenched and tempered structure with proper solution of carbides. 3.5 TOLERANCES Thickness tolerances not shown on the Engineering Drawing are to conform to AISI tolerances on spring steel strip.
