The Screw,close Tolerance, cataloged under National Stock Number 5305-01-218-4548, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries. Government technical data includes 19 specifications, cited from the U.S. Government catalog. The record lists 7 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-218-4548 |
| Primary Part Number | BACB30LR4U22 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Fastener Length | 1.785 INCHES MINIMUM AND 1.815 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.400 INCHES MINIMUM AND 0.450 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.365 INCHES MINIMUM AND 1.385 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE 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 | 28 |
| Material | IRON ALLOY 660 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.455 INCHES MINIMUM AND 0.510 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 |
|---|---|
| BACB30LR4U22 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| BACB30LR4U22 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| BACB30LR4U22 | Howmet Global Fastening Systems Inc (USA) |
| BACB30LR4U22 | Federal Manufacturing Corp (USA) |
| BACB30LR4U22 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| BACB30LR4U22 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| BACB30LR4U22 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| Reference | Meaning |
|---|---|
| BACB30LR4U22 | 5/2 Secondary reference U.S. Government activity |
| BACB30LR4U22 | 5/2 Secondary reference U.S. Government activity |
| BACB30LR4U22 | 5/9 Secondary reference U.S. Government activity |
| BACB30LR4U22 | 5/9 Secondary reference Deutsch Fastener Corp |
| BACB30LR4U22 | 3/2 Design control — primary reference U.S. Government activity |
| BACB30LR4U22 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
NSN 5305-01-218-4548 is a Screw,close Tolerance, manufactured by Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-218-4548 has 7 manufacturer part numbers on file: BACB30LR4U22 (Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries), BACB30LR4U22 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), BACB30LR4U22 (Howmet Global Fastening Systems Inc), BACB30LR4U22 (Federal Manufacturing Corp), BACB30LR4U22 (Sps Technologies, Llc Dba PB Fasteners) and 2 more.
Key specifications for BACB30LR4U22: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Fastener Length: 1.785 INCHES MINIMUM AND 1.815 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL. 19 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.