The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-606-0727, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Houston Precision Fasteners I Lp. Government technical data includes 19 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5306-01-606-0727 |
| Primary Part Number | ST3M752L4-17 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Houston Precision Fasteners I Lp |
| Status | ACTIVE |
| Extended Washer Thickness | 0.036 INCHES NOMINAL IN |
| Head Height | 0.250 INCHES NOMINAL IN |
| Fastener Length | 1.515 INCHES MINIMUM AND 1.545 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | AMS-QQ-B-35 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Extended Washer Diameter | 0.460 INCHES MINIMUM AND 0.470 INCHES MAXIMUM IN |
| Thread Length | 0.468 INCHES NOMINAL IN |
| Criticality Code Justification | AGAV |
| Material Document and Classification | AMS5829,PH13 - 8MO ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | DOUBLE HEXAGON EXTENDED WASHER |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.000 INCHES NOMINAL IN |
| Width Between Flats | 0.297 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | LUBRICANT AND PASSIVATE OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| 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 |
|---|---|
| ST3M752L4-17 PRIMARY | Houston Precision Fasteners I Lp (USA) |
| SLB255L4-17 PRIMARY | Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok (USA) |
| S343L4-17 | Huck International, Inc (USA) |
| GS1032L4-17 PRIMARY | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| 122997L4-17 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| AIC753L4-17 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| V83190L4-17 | Hi-Shear Corporation (USA) |
| VFK500L4-17 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M753L4-17 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HP7753L4-17 | Heartland Precision Fasteners Inc (USA) |
| VS3190L4-17 | Howmet Global Fastening Systems Inc (USA) |
| PBF1287L4-17 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M753L4-17 PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| 122897L4-17 | 5/9 Secondary reference Sps Technologies Inc |
| 122997L4-17 | 5/2 Secondary reference U.S. Government activity |
NSN 5306-01-606-0727 is a Bolt,close Tolerance, manufactured by Houston Precision Fasteners I Lp, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-606-0727 has 13 manufacturer part numbers on file: ST3M752L4-17 (Houston Precision Fasteners I Lp), SLB255L4-17 (Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok), S343L4-17 (Huck International, Inc), GS1032L4-17 (B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace), 122997L4-17 (Sps Technologies, Llc Dba PB Fasteners) and 8 more.
Key specifications for ST3M752L4-17: Extended Washer Thickness: 0.036 INCHES NOMINAL IN; Head Height: 0.250 INCHES NOMINAL IN; Fastener Length: 1.515 INCHES MINIMUM AND 1.545 INCHES MAXIMUM IN; Surface Treatment Document and Classification: AMS-QQ-B-35 ASSN STD SINGLE TREATMENT RESPONSE OVERALL. 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.