MS51836B
Requirements:
1. Material: Steel, carbon per SAE AIR4127.
Steel, corrosion-resistant, Class 303, cold finish per SAE AIR4127.
8rass, per ASTM 816/816M, ASTM 836/836M or ASTM 8121/8121M.
2. Protective coating: Steel, carbon shall be cadmium plated in accordance with SAE AMS-QQ-P-416, Type II, Class 3.
Steel, corrosion-resistant, shall be passivated per SAE AMS2700.
8rass shall be black oxide coated per MIL-F-495.
3. Threads: Internal threads shall be in accordance with screw thread standards for federal services, FED-STD-H28/2, Class 38.
External threads have a special form and pitch.
4. Surface roughness: Surfaces marked 125 microinches shall be in accordance with ASME 846.1.
5. Hardness: Steel, carbon, Rockwell 894-100.
Steel, corrosion-resistant, Rockwell C23-32.
8rass, Rockwell 878-83.
6. Lubrication: Inserts with self-locking internal threads for aerospace applications shall be dry film lubricated in accordance with
SAE AS5272 Type I1. Inserts with self-locking threads for non-aerospace applications shall be dry film lubricated in accordance with MIL-PRF-460102.
7. Dimensions: All dimensions are in inches and are after protective coating or treatment, but prior to dry film lubricant. "D" dimension refers to distance through internal thread lock.
8. Concentricity: External and internal threads shall be concentric in accordance with the procurement specification.
9. Part number: The MS part number shall consist of the basic MS number plus the dash number.
Add "8" in lieu of "DASH" for brass.
Add "U" in lieu of "DASH" for carbon steel.
Add "L" as suffix to dash number for internal thread lock for aerospace applications (See Req. 6).
Add "LM" as suffix to dash number for internal thread lock for non-aerospace applications (See Req. 6).
Examples: MS51836-208 Insert, CRES steel, non-locking, medium length.
MS518368208 Insert, brass, non-locking, medium length. MS51836U208 Insert, carbon steel, non-locking, medium length.
MS51836-208L Insert, CRES steel, internal thread lock, medium length, aerospace applications.
MS51836-208LM Insert, CRES steel, internal thread lock, medium length, non-aerospace applications.
10. For design feature purposes, this standard takes precedence over procurement documents referenced herein.
11. Referenced documents shall be of the same issue in effect on date of invitation for bid.
12. Install insert per MS51837.
13. Locking feature available only in corrosion-resistant steel inserts in medium and long lengths.
14. 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.
1SAE AS5272 Type 1 lubricant is technically equivalent to MIL-L-46010 Type I lubricant which superseded MIL-L-8937 lubricant used in previous revisions.
2MIL-PRF-46010 lubricant is lead (Pb) free and is not technically equivalent to MIL-L-46010 Type I lubricant which superseded MIL-L-8937 lubricant used in previous revisions. Use of MIL-PRF-46010 in aerospace applications must first be validated.
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