The Screw,shoulder, cataloged under National Stock Number 5305-01-131-9832, 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 20 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-131-9832 |
| Primary Part Number | HP6551C3-338 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Heartland Precision Fasteners Inc |
| Status | ACTIVE |
| Fastener Length | 0.579 INCHES MINIMUM AND 0.609 INCHES MAXIMUM IN |
| Shoulder Length | 0.225 INCHES MINIMUM AND 0.255 INCHES MAXIMUM FIRST SHOULDER IN |
| Surface Treatment Document and Classification | QQ-P-416,TY2,CL2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Shoulder Diameter | 0.193 INCHES MINIMUM AND 0.194 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.284 INCHES MINIMUM AND 0.344 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Hardness Rating | 33.0 ROCKWELL C MINIMUM AND 37.0 ROCKWELL C MAXIMUM OVERALL |
| Material Document and Classification | AISI ASSN STD ALL MATERIAL RESPONSES OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Minimum Tensile Strength | 150000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | SLOT |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 32 |
| Material | STEEL COMP 4037 OR STEEL COMP 8740 OVERALL |
| Thread Series Designator | UNF |
| Head Diameter | 0.276 INCHES NOMINAL 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 |
|---|---|
| HP6551C3-338 PRIMARY | Heartland Precision Fasteners Inc (USA) |
| PBF1285-3-338 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| BM19069-3-338 PRIMARY | Huck International, Inc (USA) |
| AIC551C-3-338 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| PIL551C3-338 PRIMARY | Pilgrim Screw Corp Dba Pilgrim Aerospace Fasteners Div Arizona (USA) |
| Reference | Meaning |
|---|---|
| BM19069-3-338 | 5/9 Secondary reference U.S. Government activity |
| GS551C3-338 | 7/2 Vendor item drawing reference Northrop Grumman Systems Corporation |
| PIL551C3-338 | 3/9 Design control — primary reference Pilgrim Screw Corporation Dba Pilgrim Aerospace Fasteners |
NSN 5305-01-131-9832 is a Screw,shoulder, manufactured by Heartland Precision Fasteners Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-131-9832 has 5 manufacturer part numbers on file: HP6551C3-338 (Heartland Precision Fasteners Inc), PBF1285-3-338 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), BM19069-3-338 (Huck International, Inc), AIC551C-3-338 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), PIL551C3-338 (Pilgrim Screw Corp Dba Pilgrim Aerospace Fasteners Div Arizona).
Key specifications for HP6551C3-338: Fastener Length: 0.579 INCHES MINIMUM AND 0.609 INCHES MAXIMUM IN; Shoulder Length: 0.225 INCHES MINIMUM AND 0.255 INCHES MAXIMUM FIRST SHOULDER IN; Surface Treatment Document and Classification: QQ-P-416,TY2,CL2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Shoulder Diameter: 0.193 INCHES MINIMUM AND 0.194 INCHES MAXIMUM FIRST SHOULDER IN. 20 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.