MS51991D
5. Heat treatment: Inserts shall be capable of developing 125,000 PSI tensile strength as specified in the procurement specification.
6. Hardness: Steel, carbon, Rockwell B 78 minimum.
Steel, corrosion-resistant, Rockwell B 83.
7. Fillets: .015 R max.
8. Edges: Break sharp edges .003 - .015 unless otherwise specified.
9. Dimensions: Dimensions are in inches and are met after plating.
10. Tolerances: Linear dimensions ±.005, angular dimensions ±2°.
11. Part numbers: The MS part number shall consist of the basic MS number plus the dash number. Add "E" in lieu of "DASH" for corrosion resistant steel. Add "L" as suffix to dash number for internal thread lock for aerospace applications (See Note 2). Add "LM" as suffix to dash number for internal thread lock for non-aerospace applications (See Note 2).
Examples: MS51991-205 Insert, carbon steel, non-locking.
MS51991E205 Insert, CRES, non-locking.
MS51991-205L Insert, carbon steel, internal thread lock, aerospace applications. MS51991E205L Insert, CRES, internal thread lock, aerospace applications.
MS51991E205LM Insert, CRES, internal thread lock, non-aerospace applications.
12. For design feature purposes, this standard takes precedence over procurement documents referenced herein.
13. Referenced documents shall be of the same issue in effect on date of invitation for bid.
14. The dash numbers C100, C200, and C300" series CRES inserts in the original issue of this standard are cancelled/inactivated after approval date of revision "A" indicated on this document. The cancelled inserts should be used on existing callouts until stock is depleted. Use the new "E100, E200, and E300" series CRES inserts for replacement of "C100, C200, and C300"series CRES inserts in accordance with Table IV.
15. For applicable locking dash number coding see SAE AS51990.
16. CHANGES FROM PREVIOUS ISSUE. Marginal notations are not used in this revision to identify changes with respect to the previous issue due to the extent of the changes.
MILITARY INTEREST
Custodians: Preparing activity: Army - AR DLA - IS
Navy - AS
Air Force - 99 (Project 5325-2012-015)
Review activities: Army - AT, AV, MI Navy - OS
Air Force - 71
NOTE: The activities listed above were interested in this document as of the date of this document. Since organizations and responsibilities can change, you should verify the currency of the information above using the ASSIST Online database at
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