The Screw,shoulder, cataloged under National Stock Number 5305-01-218-4545, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-218-4545 |
| Primary Part Number | ST3M851V4-8AS |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Fastener Length | 0.952 INCHES MINIMUM AND 0.999 INCHES MAXIMUM IN |
| Shoulder Length | 0.432 INCHES MINIMUM AND 0.452 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.2802 INCHES MINIMUM AND 0.2807 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.442 INCHES MINIMUM AND 0.509 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Material Document and Classification | AMS4967 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | TITANIUM ALLOY UNS R56400 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.501 INCHES MINIMUM AND 0.506 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 |
|---|---|
| HT4060V4-8AS | Hi-Shear Corporation (USA) |
| HT4060V4-8AS | Sps Technologies, Llc Dba PB Fasteners (USA) |
| HT4060V4-8AS | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M851V4-8AS PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| HT4060V4-8AS | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| HT4060V4-8AS | 5/9 Secondary reference U.S. Government activity |
| HT4060V4-8AS | 5/2 Secondary reference U.S. Government activity |
NSN 5305-01-218-4545 is a Screw,shoulder, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-218-4545 has 4 manufacturer part numbers on file: HT4060V4-8AS (Hi-Shear Corporation), HT4060V4-8AS (Sps Technologies, Llc Dba PB Fasteners), HT4060V4-8AS (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M851V4-8AS (The Boeing Company Div Defense).
Key specifications for ST3M851V4-8AS: Fastener Length: 0.952 INCHES MINIMUM AND 0.999 INCHES MAXIMUM IN; Shoulder Length: 0.432 INCHES MINIMUM AND 0.452 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Diameter: 0.2802 INCHES MINIMUM AND 0.2807 INCHES MAXIMUM FIRST SHOULDER IN; Thread Length: 0.442 INCHES MINIMUM AND 0.509 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.