The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-027-1997, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Valley-Todeco, Inc. Dba Arconic Fastening Systems. Government technical data includes 16 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 9 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-027-1997 |
| Primary Part Number | VEH160271-4M18 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Valley-Todeco, Inc. Dba Arconic Fastening Systems |
| 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 |
| Thread Length | 0.425 INCHES NOMINAL IN |
| Material Document and Classification | NAS621 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 MANUFACTURERS STANDARD |
| Grip Length | 1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM IN |
| Width Between Flats | 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | TITANIUM ALLOY 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 | X |
| Part Number | Manufacturer |
|---|---|
| GB511BY4M18 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| GB511BY4M18 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| VEH160271-4M18 PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| GB511BY4M18 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| 110185-4-18M | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| VS3117-4-18 | 3/2 Design control — primary reference U.S. Government activity |
| BM15016-4-18A | 5/9 Secondary reference U.S. Government activity |
| GB511BY4M18 | 5/9 Secondary reference Sps Technologies Inc |
| 110185-4-19M | C/1 Advisory reference — outside the item-of-supply concept Sps Technologies, Llc Dba PB Fasteners |
| GB511BY4M18 | 5/2 Secondary reference U.S. Government activity |
| BM15016-4-18A | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| 110185-4-18M | 3/2 Design control — primary reference U.S. Government activity |
| GB511BY4-18M | 7/2 Vendor item drawing reference Northrop Grumman Systems Corporation |
NSN 5306-01-027-1997 is a Bolt,close Tolerance, manufactured by Valley-Todeco, Inc. Dba Arconic Fastening Systems, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-027-1997 has 4 manufacturer part numbers on file: GB511BY4M18 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), GB511BY4M18 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), VEH160271-4M18 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), GB511BY4M18 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners).
Key specifications for VEH160271-4M18: 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. 16 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.