The Nut,plain,hexagon, cataloged under National Stock Number 5310-01-312-3681, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Trailer Component Manufacturing Inc.. Government technical data includes 13 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5310-01-312-3681 |
| Primary Part Number | 03-0503 |
| Item Name | Nut,plain,hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Trailer Component Manufacturing Inc. |
| Status | ACTIVE |
| Width Across Flats | 1.120 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-P-416,TY2CL2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Series | UNS |
| Material Document and Classification | ASTM A108 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | LEFT-HAND |
| Nominal Thread Size | 0.687 INCHES IN |
| Nut Height | 0.370 INCHES NOMINAL IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Nut Style | HEXAGON |
| Thread Class | 2B |
| Thread Quantity Per Inch | 18 |
| Material | STEEL OVERALL |
| Bearing Surface Type | FLAT |
| 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 |
|---|---|
| 03-0503 PRIMARY | Trailer Component Manufacturing Inc. (USA) |
| Reference | Meaning |
|---|---|
| 03-0503 | C/1 Advisory reference — outside the item-of-supply concept A L Hansen Manufacturing Company |
| 1676AS259-2 | 7/2 Vendor item drawing reference Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier |
NSN 5310-01-312-3681 is a Nut,plain,hexagon, manufactured by Trailer Component Manufacturing Inc., classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-312-3681 has 1 manufacturer part number on file: 03-0503 (Trailer Component Manufacturing Inc.).
Key specifications for 03-0503: Width Across Flats: 1.120 INCHES NOMINAL IN; Surface Treatment Document and Classification: QQ-P-416,TY2CL2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Series: UNS; Material Document and Classification: ASTM A108 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 13 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.