The Bolt,close Tolerance, cataloged under National Stock Number 5306-00-121-8902, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is M.s. Aerospace Inc. Dba Ms Aerospace Inc. Government technical data includes 21 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 9 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-121-8902 |
| Primary Part Number | MS27576-4-13R |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | M.s. Aerospace Inc. Dba Ms Aerospace Inc |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES GRIP |
| Surface Finish | 63.0 MICROINCHES BEARING SURFACE OF HEAD |
| Head Height | 0.126 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN |
| Fastener Length | 1.231 INCHES MINIMUM AND 1.251 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416,CL 2 FED SPEC ALL TREATMENT RESPONSES OVERALL |
| Thread Length | 0.283 INCHES MINIMUM AND 0.334 INCHES MAXIMUM IN |
| Hardness Rating | 36.0 ROCKWELL C MINIMUM AND 41.0 ROCKWELL C MAXIMUM OVERALL |
| Shank Unthreaded Hole Diameter | 0.076 INCHES MINIMUM AND 0.086 INCHES MAXIMUM FIRST HOLE IN |
| Material Document and Classification | MIL-S-5000 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5626 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 3RD MATERIAL RESPONSE OR MIL-S-6758 MIL SPEC 4TH MATERIAL RESPONSE OR MIL-S-8503 MIL SPEC 5TH MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | DISHED HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.812 INCHES MINIMUM AND 0.828 INCHES MAXIMUM IN |
| Width Between Flats | 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN |
| Grip Diameter | 0.2483 INCHES MINIMUM AND 0.2492 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP E4340 OR STEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 4130 OR STEEL COMP 6150 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 1.131 INCHES MINIMUM AND 1.161 INCHES MAXIMUM FIRST HOLE IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| MS27576-4-13R | M.s. Aerospace Inc. Dba Ms Aerospace Inc (USA) |
| AS194-4-13 | Satair A/s (DNK) |
| Reference | Meaning |
|---|---|
| MS27576-4-13R | 5/2 Secondary reference U.S. Government activity |
| AS194-4-13 | 5/9 Secondary reference U.S. Government activity |
| NASM27576-4-13R | 3/2 Design control — primary reference U.S. Government activity |
| 106467-4-13 | 5/9 Secondary reference U.S. Government activity |
| MS27576-4-13 | 5/9 Secondary reference U.S. Government activity |
| MS27576-4-13R | 3/9 Design control — primary reference U.S. Government activity |
| CA4510-4-13 | 5/9 Secondary reference Howmet Global Fastening Systems Inc. Div Tridair Products |
| CIPRD-MS27576-4-13R | 5/9 Secondary reference Defense Logistics Agency Dba Defense Supply Center Philadelphia |
| MS27576-4-13 | 5/9 Secondary reference U.S. Government activity |
NSN 5306-00-121-8902 is a Bolt,close Tolerance, manufactured by M.s. Aerospace Inc. Dba Ms Aerospace Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-121-8902 has 2 manufacturer part numbers on file: MS27576-4-13R (M.s. Aerospace Inc. Dba Ms Aerospace Inc), AS194-4-13 (Satair A/s).
Key specifications for MS27576-4-13R: Surface Finish: 63.0 MICROINCHES GRIP; Surface Finish: 63.0 MICROINCHES BEARING SURFACE OF HEAD; Head Height: 0.126 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN; Fastener Length: 1.231 INCHES MINIMUM AND 1.251 INCHES MAXIMUM IN. 21 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.