The Screw,close Tolerance, cataloged under National Stock Number 5305-01-190-4590, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Sps Technologies Llc Dba PB Fasteners Div PB Fasteners. Government technical data includes 19 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-190-4590 |
| Primary Part Number | BACB30LH3-27 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Fastener Length | 2.018 INCHES MINIMUM AND 2.048 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416,TY2,CL2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.320 INCHES MINIMUM AND 0.370 INCHES MAXIMUM IN |
| Material Document and Classification | AMS5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.678 INCHES MINIMUM AND 1.698 INCHES MAXIMUM IN |
| Grip Diameter | 0.1885 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM AND CHROMATE 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 | 0.337 INCHES MINIMUM AND 0.383 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 |
|---|---|
| BACB30LH3-27 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| BACB30LH3-27 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| BACB30LH3-27 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| BACB30LH3-27 | Federal Manufacturing Corp (USA) |
| BACB30LH3-27 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| BACB30LH3-27 | Huck International, Inc (USA) |
| Reference | Meaning |
|---|---|
| BACB30LH3-27 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| BACB30LH3-27 | 5/9 Secondary reference U.S. Government activity |
| BACB30LH3-27 | 5/9 Secondary reference U.S. Government activity |
| BACB30LH3-27 | 5/9 Secondary reference U.S. Government activity |
| BACB30LH3-27 | 5/9 Secondary reference Voi-Shan/chatsworth Div of Vsi Corp Sub of Fairchild Industries Inc |
| BACB30LH3-27 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-190-4590 is a Screw,close Tolerance, manufactured by Sps Technologies Llc Dba PB Fasteners Div PB Fasteners, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-190-4590 has 6 manufacturer part numbers on file: BACB30LH3-27 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), BACB30LH3-27 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), BACB30LH3-27 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), BACB30LH3-27 (Federal Manufacturing Corp), BACB30LH3-27 (Sps Technologies, Llc Dba PB Fasteners) and 1 more.
Key specifications for BACB30LH3-27: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Fastener Length: 2.018 INCHES MINIMUM AND 2.048 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-416,TY2,CL2 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.