The Screw,shoulder, cataloged under National Stock Number 5305-00-515-6904, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Heartland Precision Fasteners Inc. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 5 manufacturer part numbers 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-00-515-6904 |
| Primary Part Number | HP6551C3-399 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Heartland Precision Fasteners Inc |
| Status | ACTIVE |
| Fastener Length | 0.641 INCHES MINIMUM AND 0.671 INCHES MAXIMUM IN |
| Shoulder Length | 0.285 INCHES MINIMUM AND 0.315 INCHES MAXIMUM FIRST SHOULDER IN |
| Surface Treatment Document and Classification | QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Shoulder Diameter | 0.193 INCHES MINIMUM AND 0.195 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.286 INCHES MINIMUM AND 0.346 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Surface Treatment | PAINT TOP OF HEAD |
| Internal Drive Style | SLOT |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 32 |
| Material | STEEL COMP 4037 OR STEEL COMP 8740 OVERALL |
| Thread Series Designator | UNF |
| Head Diameter | 0.266 INCHES MINIMUM AND 0.286 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 |
|---|---|
| HP6551C3-399 PRIMARY | Heartland Precision Fasteners Inc (USA) |
| PIL551C3-399 PRIMARY | Pilgrim Screw Corporation Dba Pilgrim Aerospace Fasteners (USA) |
| PBF1285-3-399 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| BM19069-3-399 PRIMARY | Huck International, Inc (USA) |
| AIC551C3-399 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| Reference | Meaning |
|---|---|
| B1990-3 | 5/9 Secondary reference Goodrich Corporation |
| B1990-3 | C/1 Advisory reference — outside the item-of-supply concept Bfgoodrich Co the Aerospace Div Engineered Polymer Products |
| S100C3-399 | 5/9 Secondary reference Fastener Engineering Corp |
| GS551C3-399 | 7/2 Vendor item drawing reference Northrop Grumman Systems Corporation |
NSN 5305-00-515-6904 is a Screw,shoulder, manufactured by Heartland Precision Fasteners Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-515-6904 has 5 manufacturer part numbers on file: HP6551C3-399 (Heartland Precision Fasteners Inc), PIL551C3-399 (Pilgrim Screw Corporation Dba Pilgrim Aerospace Fasteners), PBF1285-3-399 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), BM19069-3-399 (Huck International, Inc), AIC551C3-399 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company).
Key specifications for HP6551C3-399: Fastener Length: 0.641 INCHES MINIMUM AND 0.671 INCHES MAXIMUM IN; Shoulder Length: 0.285 INCHES MINIMUM AND 0.315 INCHES MAXIMUM FIRST SHOULDER IN; Surface Treatment Document and Classification: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Shoulder Diameter: 0.193 INCHES MINIMUM AND 0.195 INCHES MAXIMUM FIRST SHOULDER IN. 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.