The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-599-4556, 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 20 specifications, cited from the U.S. Government catalog. The record lists 13 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-599-4556 |
| Primary Part Number | 3M1277E4D7A |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Fastener Length | 0.862 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | MIL-L-87132, TYPE 1, GRADE B MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.425 INCHES NOMINAL IN |
| Hole Configuration Style | ROUND |
| Material Document and Classification | AMS5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.437 INCHES NOMINAL IN |
| Grip Diameter | 0.2648 INCHES MINIMUM AND 0.2651 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Countersink Angle | 90.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | NICKEL ALLOY 718 OVERALL |
| Hole Quantity | 1 |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Hole Type | DRILLED |
| Hole Diameter | 0.076 INCHES NOMINAL IN |
| Head Diameter | 0.3859 INCHES MINIMUM AND 0.3948 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 |
|---|---|
| 3M1277E4D7A | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| 3M1277E4D7A | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| 3M1277E4D7A | Saturn Fasteners Inc (USA) |
| 3M1277E4D7A | West Coast Aerospace, Inc. (USA) |
| 3M1277E4D7A | Huck International, Inc (USA) |
| 3M1277E4D7A | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 3M1277E4D7A | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| 3M1277E4D7A PRIMARY | The Boeing Company Div Defense (USA) |
| 3M1277E4D7A | Houston Precision Fasteners I Lp (USA) |
| 3M1277E4D7A | Hi-Shear Corporation (USA) |
| 3M1277E4D7A | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| 3M1277E4D7A | Howmet Global Fastening Systems Inc (USA) |
| 3M1277E4D7A | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| Reference | Meaning |
|---|---|
| 3M1277E4D7A | 5/2 Secondary reference U.S. Government activity |
| 3M1277E4D7A | 5/2 Secondary reference U.S. Government activity |
NSN 5306-01-599-4556 is a Bolt,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-599-4556 has 13 manufacturer part numbers on file: 3M1277E4D7A (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), 3M1277E4D7A (Fastener Innovation Technology, Inc. Dba F I T), 3M1277E4D7A (Saturn Fasteners Inc), 3M1277E4D7A (West Coast Aerospace, Inc.), 3M1277E4D7A (Huck International, Inc) and 8 more.
Key specifications for 3M1277E4D7A: Fastener Length: 0.862 INCHES NOMINAL IN; Surface Treatment Document and Classification: MIL-L-87132, TYPE 1, GRADE B MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.425 INCHES NOMINAL IN; Hole Configuration Style: ROUND. 20 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.