The Screw,close Tolerance, cataloged under National Stock Number 5305-01-043-7716, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc. Government technical data includes 23 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-043-7716 |
| Primary Part Number | 76121-4-4 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Fastener Length | 0.638 INCHES MINIMUM AND 0.668 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.378 INCHES MINIMUM AND 0.428 INCHES MAXIMUM IN |
| Hardness Rating | 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL |
| Shank Unthreaded Hole Diameter | 0.076 INCHES MINIMUM AND 0.086 INCHES MAXIMUM FIRST HOLE IN |
| Material Document and Classification | AMS 5732 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 26512-GB510B MANUFACTURERS STANDARD |
| Grip Length | 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Quantity Per Inch | 28 |
| Material | IRON ALLOY 660 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 0.090 INCHES MINIMUM AND 0.110 INCHES MAXIMUM FIRST HOLE IN |
| Head Diameter | 0.350 INCHES MINIMUM AND 0.398 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 |
|---|---|
| 76121-4-4 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| 76121-4-4 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| 76121-4-4 | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| BM19047C4H4 | 5/9 Secondary reference U.S. Government activity |
| BM19047C4H4 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| 76121-4-4 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| 76121-4-4 | 3/2 Design control — primary reference U.S. Government activity |
| GB51DC4-4 | 7/2 Vendor item drawing reference Northrop Grumman Systems Corporation |
| 76121-4-4 | 5/9 Secondary reference Abounding Security Inc Div of Maa Corp |
| 76121-4-4 | 5/9 Secondary reference Aero Mechanical Fastening Systems Inc |
NSN 5305-01-043-7716 is a Screw,close Tolerance, manufactured by Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-043-7716 has 3 manufacturer part numbers on file: 76121-4-4 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), 76121-4-4 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), 76121-4-4 (Hi-Shear Corporation).
Key specifications for 76121-4-4: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Fastener Length: 0.638 INCHES MINIMUM AND 0.668 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL. 23 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.