The Screw,close Tolerance, cataloged under National Stock Number 5305-01-451-9021, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Boeing Defence Australia Ltd. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 8 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-451-9021 |
| Primary Part Number | BACB30LH2-9 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Boeing Defence Australia Ltd |
| Status | ACTIVE |
| Fastener Length | 0.892 INCHES MINIMUM AND 0.922 INCHES MAXIMUM IN |
| Thread Length | 0.345 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.164 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.552 INCHES MINIMUM AND 0.572 INCHES MAXIMUM IN |
| Grip Diameter | 0.1625 INCHES MINIMUM AND 0.1635 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| Internal Drive Style | CROSS RECESS TYPE 1 |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | IRON ALLOY 660 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.255 INCHES MINIMUM AND 0.334 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 |
|---|---|
| BACB30LH2-9 | Boeing Defence Australia Ltd (AUS) |
| BACB30LH2-9 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| BACB30LH2-9 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| BACB30LH2-9 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| BACB30LH2-9 | Howmet Global Fastening Systems Inc Div City of Industry Operations (USA) |
| BACB30LH2-9 | Boeing Defence Australia Ltd Div Defense, Space & Security (AUS) |
| BACB30LH2-9 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| BACB30LH2-9 | Federal Manufacturing Corp (USA) |
| Reference | Meaning |
|---|---|
| BACB30LH2-9 | 3/2 Design control — primary reference U.S. Government activity |
| BACB30LH2-9 | 5/9 Secondary reference Voi-Shan/chatsworth Div of Vsi Corp Sub of Fairchild Industries Inc |
| BACB30LH2-9 | 5/2 Secondary reference U.S. Government activity |
NSN 5305-01-451-9021 is a Screw,close Tolerance, manufactured by Boeing Defence Australia Ltd, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-451-9021 has 8 manufacturer part numbers on file: BACB30LH2-9 (Boeing Defence Australia Ltd), BACB30LH2-9 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), BACB30LH2-9 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), BACB30LH2-9 (Sps Technologies, Llc Dba PB Fasteners), BACB30LH2-9 (Howmet Global Fastening Systems Inc Div City of Industry Operations) and 3 more.
Key specifications for BACB30LH2-9: Fastener Length: 0.892 INCHES MINIMUM AND 0.922 INCHES MAXIMUM IN; Thread Length: 0.345 INCHES NOMINAL IN; Nominal Thread Diameter: 0.164 INCHES IN; Head Style: FLAT COUNTERSUNK. 15 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.