MS51832D
Requirements:
1. Material. Steel, corrosion-resistant, Type 303 (UNS S30300) in accordance with chemical composition of SAE AMS 5640 (Type 1) or ASTM A582/A582M, or Type 303SE (UNS S30323) in accordance with chemical composition of SAE AMS 5640 (Type 2), SAE AMS 5738 or ASTM A582/A582M.
Steel, corrosion-resistant. Type A286 (UNS S66286) in accordance with SAE AMS 5731, SAE AMS 5734 or SAE AMS 5737.
Steel, alloy, grade 4140 (UNS G41400) in accordance with SAE AMS 6349 or SAE AMS 6382 or grade 8740 (UNS G87400) in accordance with SAE AMS 6322.
Locking keys: steel, corrosion-resistant. Type 302 chemical composition of ASTM A580/A580M only.
2. Cadmium plating and surface treatment. Corrosion-resistant steel shall be passivated in accordance with SAE AMS2700.
Alloy steel shall be cadmium plated in accordance with SAE AMS-QQ-P-416, Type II, Class 3. The locking keys may or may not be cadmium plated.
3. Lubrication. Inserts with self-locking internal threads shall be dry film lubricated in accordance with MIL-PRF-46010, Type I. The locking keys may or may not be lubricated.
4. Surface texture: Machined surfaces shall be in accordance with ASME 846.1.
5. Heat treatment: Alloy steel inserts shall be heat treated to 160,000 psi Ftu minimum in accordance with SAE AMS-H- 6875.
Corrosion-resistant steel inserts, type A286 (SAE AMS 5734). Shall be heat treated to 140,000 psi Ftu minimum.
6. Hardness. Alloy steel inserts shall have a hardness range of 36-40 HRC.
7. Part number. The part number shall consist of the basic MS sheet number plus the dash number taken from table I or table II, as applicable:
Example: MS51832 - 102 L
Add "L" as suffix to dash number for internal thread lock
Leave blank if internal thread lock is not required
Dash number from Table I or Table II
Material: Dash indicates CRES. Type 303 or 303SE.
Add "CA" in lieu of dash for CRES, Type A286.
Add "A" in lieu of dash for alloy steel, grade 4140 or 8740.
8asic MS sheet number.
Example: MS51832CA102L indicates - Insert, Screw-Thread, Locked In, Key-Locked, Lightweight, CRES A286, .250-20UNJC-38 internal thread with internal thread lock feature.
8. Material marking: CRES 303 or 303SE has no identifying mark.
CRES A286 shall be identified on top of insert by one (1) line or dash mark.
Alloy steel 4140 or 8740 shall be identified on top of insert by two (2) parallel lines or dash marks. Material marking of miniature type optional.
9. Inserts with internal thread size .190 and smaller shall be supplied with two (2) locking keys spaced 180° apart. Inserts with internal thread size .250 and greater shall be supplied with four (4) locking keys spaced 90° apart.
10. Inserts shall be free of all hanging burrs and slivers which might become dislodged under usage.
11. Source identification mark: Source identification mark shall be in accordance with MIL-I-45914.
12. All dimensions are after cadmium plating or surface treatment and prior to the addition of the lubrication.
13. Fillets are R .015 maximum.
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