The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-660-3938, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 19 specifications, cited from the U.S. Government catalog. The record lists 7 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-660-3938 |
| Primary Part Number | 3M1276E4D9A |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.095 INCHES NOMINAL IN |
| Fastener Length | 0.9725 INCHES MINIMUM AND 1.0025 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | MIL-L-87132, TYPE I, GRADE B MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.425 INCHES NOMINAL IN |
| Shank Unthreaded Hole Diameter | 0.076 INCHES MINIMUM AND 0.086 INCHES MAXIMUM THREADS IN |
| Material Document and Classification | AMS 5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.2500 INCHES IN |
| Head Style | FILLISTER COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.5525 INCHES MINIMUM AND 0.5575 INCHES MAXIMUM IN |
| Grip Diameter | 0.2802 INCHES MINIMUM AND 0.2807 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | NICKEL ALLOY 718 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 0.8915 INCHES MINIMUM AND 1.1035 INCHES MAXIMUM THREADS IN |
| Head Diameter | 0.470 INCHES MINIMUM AND 0.477 INCHES MAXIMUM 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 |
|---|---|
| 3M1276E4D9A PRIMARY | The Boeing Company Div Defense (USA) |
| 3M1276E4D9A | Hi-Shear Corporation (USA) |
| 3M1276E4D9A | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| 3M1276E4D9A | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| 3M1276E4D9A | Howmet Global Fastening Systems Inc (USA) |
| 3M1276E4D9A | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 3M1276E4D9A | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| Reference | Meaning |
|---|---|
| 3M1276E4D9A | 5/2 Secondary reference U.S. Government activity |
NSN 5306-01-660-3938 is a Bolt,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-660-3938 has 7 manufacturer part numbers on file: 3M1276E4D9A (The Boeing Company Div Defense), 3M1276E4D9A (Hi-Shear Corporation), 3M1276E4D9A (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), 3M1276E4D9A (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), 3M1276E4D9A (Howmet Global Fastening Systems Inc) and 2 more.
Key specifications for 3M1276E4D9A: Head Height: 0.095 INCHES NOMINAL IN; Fastener Length: 0.9725 INCHES MINIMUM AND 1.0025 INCHES MAXIMUM IN; Surface Treatment Document and Classification: MIL-L-87132, TYPE I, GRADE B MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.425 INCHES NOMINAL IN. 19 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.