The Bolt,square Neck, cataloged under National Stock Number 5306-01-166-8556, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is General Motors Llc Dba General Motors Llc. Government technical data includes 16 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-166-8556 |
| Primary Part Number | 15599971 |
| Item Name | Bolt,square Neck |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | General Motors Llc Dba General Motors Llc |
| Status | ACTIVE |
| Neck Length | 0.620 INCHES MINIMUM AND 0.650 INCHES MAXIMUM IN |
| Head Height | 0.250 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN |
| Fastener Length | 3.660 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | GM 4342-M CODE 20U32 FSCM 11862 MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 3.210 INCHES NOMINAL IN |
| Material Document and Classification | SAE ASSN STD ALL MATERIAL RESPONSES OVERALL |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Head Style | BUTTON |
| Thread Direction | RIGHT-HAND |
| Neck Width | 0.492 INCHES MINIMUM AND 0.515 INCHES MAXIMUM IN |
| Surface Treatment | ZINC OVERALL |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 13 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNRC |
| Head Diameter | 1.220 INCHES MINIMUM AND 1.250 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 | X |
| Part Number | Manufacturer |
|---|---|
| 15599971 PRIMARY | General Motors Llc Dba General Motors Llc (USA) |
| Reference | Meaning |
|---|---|
| 14014388 | 5/9 Secondary reference General Motors Llc Dba General Motors Llc |
| 15599971 | 5/9 Secondary reference General Motors Corp Chevrolet Motor Div Special Products Dept |
| 6274946 ITEM 9 | 5/9 Secondary reference General Motors Corp Chevrolet Motor Div Special Products Dept |
| 14014388 | 5/9 Secondary reference General Motors Corp Chevrolet Motor Div Special Products Dept |
NSN 5306-01-166-8556 is a Bolt,square Neck, manufactured by General Motors Llc Dba General Motors Llc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-166-8556 has 1 manufacturer part number on file: 15599971 (General Motors Llc Dba General Motors Llc).
Key specifications for 15599971: Neck Length: 0.620 INCHES MINIMUM AND 0.650 INCHES MAXIMUM IN; Head Height: 0.250 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN; Fastener Length: 3.660 INCHES NOMINAL IN; Surface Treatment Document and Classification: GM 4342-M CODE 20U32 FSCM 11862 MFR REF SINGLE TREATMENT RESPONSE OVERALL. 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.