The Screw,close Tolerance, cataloged under National Stock Number 5305-01-337-6020, 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 18 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-337-6020 |
| Primary Part Number | BACB30MS9R26 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES BEARING SURFACE OF HEAD |
| Fastener Length | 2.450 INCHES MINIMUM AND 2.480 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | BAC 5861,CAGE81205 MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.840 INCHES NOMINAL IN |
| Material Document and Classification | AMS 4928 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 4967 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.562 INCHES IN |
| Features Provided | CETYL ALCOHOL LUBRICANT |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.615 INCHES MINIMUM AND 1.635 INCHES MAXIMUM IN |
| Grip Diameter | 0.5610 INCHES MINIMUM AND 0.5615 INCHES MAXIMUM IN |
| Surface Treatment | PHOSPHATE OVERALL |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 18 |
| Material | TITANIUM ALLOY UNS R56400 OVERALL |
| Head Diameter | 1.071 INCHES MINIMUM AND 1.146 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 |
|---|---|
| BACB30MS9R26 | Hi-Shear Corporation (USA) |
| BACB30MS9R26 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| BACB30MS9R26 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| Reference | Meaning |
|---|---|
| BACB30MS9R26 | 5/2 Secondary reference U.S. Government activity |
| BACB30MS9R26 | 5/9 Secondary reference U.S. Government activity |
| BACB30MS9R26 | 3/2 Design control — primary reference U.S. Government activity |
| BACB30MS9R26 | 5/2 Secondary reference U.S. Government activity |
| BACB30MS9R26 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
NSN 5305-01-337-6020 is a Screw,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-337-6020 has 3 manufacturer part numbers on file: BACB30MS9R26 (Hi-Shear Corporation), BACB30MS9R26 (Sps Technologies, Llc Dba PB Fasteners), BACB30MS9R26 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc).
Key specifications for BACB30MS9R26: Surface Finish: 63.0 MICROINCHES BEARING SURFACE OF HEAD; Fastener Length: 2.450 INCHES MINIMUM AND 2.480 INCHES MAXIMUM IN; Surface Treatment Document and Classification: BAC 5861,CAGE81205 MFR REF SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.840 INCHES NOMINAL 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.