The Screw,close Tolerance, cataloged under National Stock Number 5305-01-211-0683, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Hi-Shear Corporation. Government technical data includes 20 specifications, cited from the U.S. Government catalog. The record lists 6 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-211-0683 |
| Primary Part Number | BACB30EL6C74 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Fastener Length | 5.001 INCHES MINIMUM AND 5.031 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.366 INCHES MINIMUM AND 0.416 INCHES MAXIMUM IN |
| Hardness Rating | 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 4.615 INCHES MINIMUM AND 4.635 INCHES MAXIMUM IN |
| Grip Diameter | 0.3735 INCHES MINIMUM AND 0.3745 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP E4340 OR STEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 8735 OR STEEL COMP 6150 OR STEEL COMP 4130 OVERALL |
| Thread Series Designator | UNF |
| Head Diameter | 0.515 INCHES MINIMUM AND 0.566 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 |
|---|---|
| BACB30EL6C74 | Hi-Shear Corporation (USA) |
| BACB30EL6C74 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| BACB30EL6C74 | Howmet Global Fastening Systems Inc (USA) |
| BACB30EL6C74 | Howmet Global Fastening Systems Inc Div City of Industry Operations (USA) |
| BACB30EL6C74 | Huck International, Inc (USA) |
| BACB30EL6C74 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| BACB30EL6C74 | 3/2 Design control — primary reference U.S. Government activity |
| BACB30EL6-74 | 5/9 Secondary reference U.S. Government activity |
| BACB30EL6-74 | 5/9 Secondary reference U.S. Government activity |
| BACB30EL6-74 | 5/9 Secondary reference U.S. Government activity |
| BACB30EL6C74 | 5/9 Secondary reference Voi-Shan/chatsworth Div of Vsi Corp Sub of Fairchild Industries Inc |
| BACB30EL6-74 | 5/9 Secondary reference Hi-Shear Corporation |
| BACB30EL6-74 | 5/9 Secondary reference U.S. Government activity |
| BACB30EL6-74 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
NSN 5305-01-211-0683 is a Screw,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-211-0683 has 6 manufacturer part numbers on file: BACB30EL6C74 (Hi-Shear Corporation), BACB30EL6C74 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), BACB30EL6C74 (Howmet Global Fastening Systems Inc), BACB30EL6C74 (Howmet Global Fastening Systems Inc Div City of Industry Operations), BACB30EL6C74 (Huck International, Inc) and 1 more.
Key specifications for BACB30EL6C74: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Fastener Length: 5.001 INCHES MINIMUM AND 5.031 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL. 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.