The Bolt,close Tolerance, cataloged under National Stock Number 5306-00-092-7339, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Northrop Grumman Systems Corporation. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 5 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-092-7339 |
| Primary Part Number | GB511BY4M3 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES GRIP |
| Surface Finish | 63.0 MICROINCHES BEARING SURFACE OF HEAD |
| Surface Finish | 16.0 MICROINCHES THREADS |
| Head Height | 0.125 INCHES MINIMUM AND 0.140 INCHES MAXIMUM IN |
| Fastener Length | 0.598 INCHES MINIMUM AND 0.628 INCHES MAXIMUM IN |
| Thread Length | 0.400 INCHES MINIMUM AND 0.450 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 4928 ASSN STD SINGLE MATERIAL RESPONSE OR NAS 621 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 26512-GB511BY4-3 MANUFACTURERS STANDARD |
| Grip Length | 0.178 INCHES MINIMUM AND 0.198 INCHES MAXIMUM IN |
| Width Between Flats | 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | TITANIUM ALLOY OVERALL |
| Thread Series Designator | UNF |
| 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 |
|---|---|
| GB511BY4M3 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| GB511BY4M3 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| VEH160271-4M3 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| 110185-4-3M | Sps Technologies, Llc Dba PB Fasteners (USA) |
| GB511BY4M3 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| GB511BY4M3 | 5/2 Secondary reference U.S. Government activity |
| BM15016-4-3A | 5/9 Secondary reference U.S. Government activity |
| BM15016-4-3A | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| BM15016-4-3 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 110185-4-3M | 5/9 Secondary reference Sps Technologies Inc |
NSN 5306-00-092-7339 is a Bolt,close Tolerance, manufactured by Northrop Grumman Systems Corporation, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-092-7339 has 5 manufacturer part numbers on file: GB511BY4M3 (Northrop Grumman Systems Corporation), GB511BY4M3 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), VEH160271-4M3 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), 110185-4-3M (Sps Technologies, Llc Dba PB Fasteners), GB511BY4M3 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners).
Key specifications for GB511BY4M3: Surface Finish: 63.0 MICROINCHES GRIP; Surface Finish: 63.0 MICROINCHES BEARING SURFACE OF HEAD; Surface Finish: 16.0 MICROINCHES THREADS; Head Height: 0.125 INCHES MINIMUM AND 0.140 INCHES MAXIMUM IN. 18 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.