The Bolt,square Neck, cataloged under National Stock Number 5306-01-661-9662, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 18 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5306-01-661-9662 |
| Primary Part Number | 8500417 ITEM 8-5 |
| Item Name | Bolt,square Neck |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Neck Length | 0.281 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN |
| Head Height | 0.229 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN |
| Fastener Length | 1.250 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | ASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.954 INCHES NOMINAL IN |
| Material Document and Classification | ALLOY 316L ONLY,COND CW,SST S31606 PER ASTM F879 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 05047-ASME B18.24-2015 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Neck Width | 0.483 INCHES MINIMUM AND 0.515 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Countersink Angle | 114.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 13 |
| Material | STEEL COMP 316L OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 1.125 INCHES MINIMUM AND 1.233 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 |
|---|---|
| 8500417 ITEM 8-5 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 100-8500417 ITEM 8-5 | 5/9 Secondary reference Naval Sea Systems Command |
| AEB18U500A25EB9A31 | 3/9 Design control — primary reference The American Society of Mechanical Engineers |
NSN 5306-01-661-9662 is a Bolt,square Neck, manufactured by Naval Sea Systems Command, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-661-9662 has 1 manufacturer part number on file: 8500417 ITEM 8-5 (Naval Sea Systems Command).
Key specifications for 8500417 ITEM 8-5: Neck Length: 0.281 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN; Head Height: 0.229 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN; Fastener Length: 1.250 INCHES NOMINAL IN; Surface Treatment Document and Classification: ASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL. 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.