Steel, Mechanical Tubing, 0.95Cr - 0.20Mo (0.33 - 0.38C) (SAE 4135).

This specification covers an aircraft-quality, low-alloy steel in the form of mechanical tubing. This tubing has been used typically for parts, 0.75 inch (19 mm) and under in section thickness at time of heat treatment, requiring a through-hardening steel capable of developing hardness as high as 40 HRC when properly hardened and tempered and for parts of greater thickness but requiring proportionately lower hardness, but usage is not limited to such applications.

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Current & Historical versions of this standard
Standard	Date published	?Status
AMS6372M	2013-02-25	Revised
AMS6372L	2009-03-23	Revised
AMS6372K	2004-10-18	Revised
AMS6372J	1999-10-01	Revised
AMS6372H	1990-10-01	Reaffirmed
AMS6372G	1984-04-01	Revised
AMS6372F	1983-10-01	Revised
AMS6372E	1977-01-15	Revised
AMS6372D	1966-09-30	Revised
AMS6372C	1951-10-01	Revised
AMS6372B	1950-12-01	Revised
AMS6372A	1947-12-01	Revised
AMS6372	1945-10-01	Issued