MS20500G
TABLE I. Dash Numbers, Dimensions and Strengths.
(a)
(a)
(a) Inactive for design after 17 Nov. 1967
Requirements:
1. Materials: Heat resistant and corrosion resistant steel in accordance with SAE AMS 5642 (UNS S34720, S34723), SAE AMS 5646 (UNS S34700), SAE AMS 5732 (UNS S66286), or SAE AMS 5737 (UNS S66286).
2. Surface Coating: silver plate in accordance with SAE AMS 2410, plate thickness on external surface shall not be less than .0002 inch. Threads shall show complete coverage but thickness requirements on threads are waived.
3. Surface Texture: Surface texture in accordance with ASME B46.1. unless otherwise specified surface roughness shall not be greater than Ra 125.
Notes:
1. Threads in accordance with SAE AS8879.
2. Dimensions across flats include deformation of self-locking device.
3. These nuts shall be used in accordance with NASM33588.
4. Unless otherwise specified dimensions in inches.
5. Break all sharp edges and remove all hanging burrs and slivers.
6. MS20500-720A items can universally replace the inactive MS20500-720 items but the inactive
MS20500-720 items cannot always replace the superseding MS20500-720A items.
7. Example of part number:
MS20500 - 428 - Nut, Self-Locking, .2500-28, Heat Resistant and CRES Nut, Silver Plated
Size Dash No. (See Table 1) Military Standard Number
8. For design feature purposes, this standard takes precedence over procurement documents referenced herein.
2
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