The Screw,shoulder, cataloged under National Stock Number 5305-01-428-2140, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Sps Technologies, Llc Dba PB Fasteners. Government technical data includes 21 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-428-2140 |
| Primary Part Number | 121557-3-A11FX |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Sps Technologies, Llc Dba PB Fasteners |
| Status | ACTIVE |
| Fastener Length | 0.996 INCHES MINIMUM AND 1.026 INCHES MAXIMUM IN |
| Shoulder Length | 0.313 INCHES MINIMUM AND 0.333 INCHES MAXIMUM FIRST SHOULDER IN |
| Surface Treatment Document and Classification | NAS 672 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Shoulder Diameter | 0.2041 INCHES MINIMUM AND 0.2051 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.261 INCHES MINIMUM AND 0.323 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Hardness Rating | 46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL |
| Material Document and Classification | AMS 6487 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | CADMIUM OVERALL |
| Minimum Tensile Strength | 220000 POUNDS PER SQUARE INCH LBS |
| Minimum Yield Strength | 132000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | OFFSET CRUCIFORM (TORQUE SET) |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | STEEL COMP H11 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.325 INCHES MINIMUM AND 0.385 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 |
|---|---|
| C7984-3-11R | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| C7984-3-11R | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| 121557-3-A11FX PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| VT1693F3-11-X PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| HO44-3-11R | 5/9 Secondary reference U.S. Government activity |
| HO44-3-11R | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| 12157-3-A11PX | 3/2 Design control — primary reference U.S. Government activity |
| AIC984-3-11R | 5/9 Secondary reference Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company |
| C7984-3-11R | 7/2 Vendor item drawing reference U.S. Government activity |
| VT1693F3-11-R | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-428-2140 is a Screw,shoulder, manufactured by Sps Technologies, Llc Dba PB Fasteners, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-428-2140 has 4 manufacturer part numbers on file: C7984-3-11R (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), C7984-3-11R (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), 121557-3-A11FX (Sps Technologies, Llc Dba PB Fasteners), VT1693F3-11-X (Howmet Global Fastening Systems Inc).
Key specifications for 121557-3-A11FX: Fastener Length: 0.996 INCHES MINIMUM AND 1.026 INCHES MAXIMUM IN; Shoulder Length: 0.313 INCHES MINIMUM AND 0.333 INCHES MAXIMUM FIRST SHOULDER IN; Surface Treatment Document and Classification: NAS 672 ASSN STD SINGLE TREATMENT RESPONSE OVERALL; Shoulder Diameter: 0.2041 INCHES MINIMUM AND 0.2051 INCHES MAXIMUM FIRST SHOULDER IN. 21 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.