The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-536-4441, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Fastener Innovation Technology, Inc. Dba F I T. Government technical data includes 19 specifications, cited from the U.S. Government catalog. The record lists 17 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5306-01-536-4441 |
| Primary Part Number | 3M1277E3D3A |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Fastener Innovation Technology, Inc. Dba F I T |
| Status | ACTIVE |
| Head Height | 0.042 INCHES NOMINAL IN |
| Fastener Length | 0.518 INCHES MINIMUM AND 0.588 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | MIL-L-87132,TY 1,GR B MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.330 INCHES MINIMUM AND 0.360 INCHES MAXIMUM IN |
| Supplementary Features | COTTER PIN HOLE 0.070 INCH DIA AT TIP OF BOLT 0.106 INCH FROM END IN |
| Criticality Code Justification | AGAV |
| Material Document and Classification | AMS 5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FILLISTER COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.178 INCHES MINIMUM AND 0.198 INCHES MAXIMUM IN |
| Grip Diameter | 0.2021 INCHES MINIMUM AND 0.2026 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 | 32 |
| Material | NICKEL ALLOY 718 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.265 INCHES MINIMUM AND 0.272 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 | Y |
| Part Number | Manufacturer |
|---|---|
| 3M1277E3D3A | Houston Precision Fasteners I Lp (USA) |
| TX1027E3D3XA | Howmet Global Fastening Systems Inc (USA) |
| 3M1277E3D3A PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| 3M1277E3D3A PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| TX1027E3D3XA | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 11861E3D3A | Reid Products Inc. Dba Reid Products Inc (USA) |
| 3M1277E3D3A | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| TX1027E3D3XA | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| TX1027E3D3XA | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| TX1027E3D3XA | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| 3M1277E3D3A PRIMARY | Heartland Precision Fasteners Inc (USA) |
| TX1027E3D3XA | Hi-Shear Corporation (USA) |
| 3M1277E3D3A PRIMARY | The Boeing Company Div Defense (USA) |
| 3M1277E3D3A | Camcar Llc Div Camcar Llc (USA) |
| WC1277E3D3A | West Coast Aerospace, Inc. (USA) |
| 3M1277E3D3A | Ball, Monica (USA) |
| 3M1277E3D3A | Saturn Fasteners Inc (USA) |
| Reference | Meaning |
|---|---|
| TX1027E3D3XA | 5/2 Secondary reference U.S. Government activity |
| TX1027E3D3XA | 5/9 Secondary reference Sps Technologies Inc |
NSN 5306-01-536-4441 is a Bolt,close Tolerance, manufactured by Fastener Innovation Technology, Inc. Dba F I T, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-536-4441 has 17 manufacturer part numbers on file: 3M1277E3D3A (Houston Precision Fasteners I Lp), TX1027E3D3XA (Howmet Global Fastening Systems Inc), 3M1277E3D3A (Fastener Innovation Technology, Inc. Dba F I T), 3M1277E3D3A (Valley-Todeco, Inc. Dba Arconic Fastening Systems), TX1027E3D3XA (Sps Technologies, Llc Dba PB Fasteners) and 12 more.
Key specifications for 3M1277E3D3A: Head Height: 0.042 INCHES NOMINAL IN; Fastener Length: 0.518 INCHES MINIMUM AND 0.588 INCHES MAXIMUM IN; Surface Treatment Document and Classification: MIL-L-87132,TY 1,GR B MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.330 INCHES MINIMUM AND 0.360 INCHES MAXIMUM 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.