The Screw,close Tolerance, cataloged under National Stock Number 5305-01-338-3137, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Government technical data includes 13 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-338-3137 |
| Primary Part Number | BACB30MS9R29 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Fastener Length | 2.6375 INCHES MINIMUM AND 2.6675 INCHES MAXIMUM IN |
| Thread Length | 0.840 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.562 INCHES IN |
| Features Provided | CETYL ALCOHOL LUBRICANT |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.8025 INCHES MINIMUM AND 1.8225 INCHES MAXIMUM IN |
| Grip Diameter | 0.5610 INCHES MINIMUM AND 0.5615 INCHES MAXIMUM IN |
| 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 |
| 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 |
|---|---|
| BACB30MS9R29 | Howmet Global Fastening Systems Inc (USA) |
| BACB30MS9R29 | Hi-Shear Corporation (USA) |
| BACB30MS9R29 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| BACB30MS9R29 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| Reference | Meaning |
|---|---|
| BACB30MS9R29 | 5/2 Secondary reference U.S. Government activity |
| BACB30MS9R29 | 5/2 Secondary reference U.S. Government activity |
| BACB30MS9R29 | 3/2 Design control — primary reference U.S. Government activity |
| BACB30MS9R29 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| BACB30MS9R29 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-338-3137 is a Screw,close Tolerance, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-338-3137 has 4 manufacturer part numbers on file: BACB30MS9R29 (Howmet Global Fastening Systems Inc), BACB30MS9R29 (Hi-Shear Corporation), BACB30MS9R29 (Sps Technologies, Llc Dba PB Fasteners), BACB30MS9R29 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc).
Key specifications for BACB30MS9R29: Fastener Length: 2.6375 INCHES MINIMUM AND 2.6675 INCHES MAXIMUM IN; Thread Length: 0.840 INCHES NOMINAL IN; Nominal Thread Diameter: 0.562 INCHES IN; Features Provided: CETYL ALCOHOL LUBRICANT. 13 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.