The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-536-4433, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Heartland Precision Fasteners Inc. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5306-01-536-4433 |
| Primary Part Number | 3M1277E4D5A |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Heartland Precision Fasteners Inc |
| Status | ACTIVE |
| Head Height | 0.057 INCHES NOMINAL IN |
| Fastener Length | 0.722 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | MIL-L-87132,TY 1,GR B MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.410 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN |
| Supplementary Features | 0.076 INCH DIA COTTER PIN HOLE AT THE TIP OF THE BOLT 0.106 INCH FROM THE END IN |
| Criticality Code Justification | AGAV |
| Material Document and Classification | AMS 5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FILLISTER COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN |
| Grip Diameter | 0.2646 INCHES MINIMUM AND 0.2651 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) |
| 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 |
|---|---|
| 3M1277E4D5A | Houston Precision Fasteners I Lp (USA) |
| 3M1277E4D5A PRIMARY | Heartland Precision Fasteners Inc (USA) |
| 3M1277E4D5A PRIMARY | The Boeing Company Div Defense (USA) |
| TX1027E4D5XA | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| 3M1277E4D5A PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| TX1027E4D5XA | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| 11861E4D5A | Reid Products Inc. Dba Reid Products Inc (USA) |
| 3M1277E4D5A PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| 3M1277E4D5A | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| 3M1277E4D5A | Camcar Llc Div Camcar Llc (USA) |
| TX1027E4D5XA | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| TX1027E4D5XA | Howmet Global Fastening Systems Inc (USA) |
| TX1027E4D5XA | Hi-Shear Corporation (USA) |
| 3M1277E4D5A PRIMARY | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| 3M1277E4D5A PRIMARY | Saturn Fasteners Inc (USA) |
| TX1027E4D5XA | Sps Technologies, Llc Dba PB Fasteners (USA) |
| WC1277E4D5A | West Coast Aerospace, Inc. (USA) |
| Reference | Meaning |
|---|---|
| TX1027E4D5XA | 5/2 Secondary reference U.S. Government activity |
| TX1027E4D5XA | 5/9 Secondary reference Sps Technologies Inc |
NSN 5306-01-536-4433 is a Bolt,close Tolerance, manufactured by Heartland Precision Fasteners Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-536-4433 has 17 manufacturer part numbers on file: 3M1277E4D5A (Houston Precision Fasteners I Lp), 3M1277E4D5A (Heartland Precision Fasteners Inc), 3M1277E4D5A (The Boeing Company Div Defense), TX1027E4D5XA (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), 3M1277E4D5A (Fastener Innovation Technology, Inc. Dba F I T) and 12 more.
Key specifications for 3M1277E4D5A: Head Height: 0.057 INCHES NOMINAL IN; Fastener Length: 0.722 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN; Surface Treatment Document and Classification: MIL-L-87132,TY 1,GR B MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.410 INCHES MINIMUM AND 0.440 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.