The Screw,close Tolerance, cataloged under National Stock Number 5305-01-212-4553, 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 20 specifications, cited from the U.S. Government catalog. The record lists 10 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-212-4553 |
| Primary Part Number | BACB30NN3K6 |
| 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 |
| Surface Finish | 63.0 MICROINCHES BEARING SURFACE OF HEAD |
| Fastener Length | 0.705 INCHES MINIMUM AND 0.735 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | BMS 10-85,TY1,CL160TT3H MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.320 INCHES MINIMUM AND 0.370 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 4967 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 4928 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN |
| Grip Diameter | 0.1885 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN |
| Surface Treatment | ALUMINUM 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 | TITANIUM ALLOY OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.345 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 |
|---|---|
| BACB30NN3K6 | Huck International, Inc (USA) |
| BACB30NN3K6 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| BACB30NN3K6 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| BACB30NN3K6 | Hi-Shear Corporation (USA) |
| BACB30NN3K6 | Boeing Defence Australia Ltd (AUS) |
| BACB30NN3K6 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| BACB30NN3K6 | Boeing Defence Australia Ltd Div Defense, Space & Security (AUS) |
| BACB30NN3K6 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| BACB30NN3K6 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| BACB30NN3K6 | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| BACB30NN3K6 | 5/9 Secondary reference U.S. Government activity |
| BACB30NN3K6 | 5/9 Secondary reference U.S. Government activity |
| BACB30NN3K6 | 5/9 Secondary reference U.S. Government activity |
| BACB30NN3K6 | 5/9 Secondary reference Sps Technologies Inc |
| 5305PL2057814 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| BACB30NN3K6 | 1/2 Source control — Government-approved source U.S. Government activity |
| BACB30NN3K6 | 5/2 Secondary reference U.S. Government activity |
NSN 5305-01-212-4553 is a Screw,close Tolerance, manufactured by Sps Technologies Llc Dba PB Fasteners Div PB Fasteners, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-212-4553 has 10 manufacturer part numbers on file: BACB30NN3K6 (Huck International, Inc), BACB30NN3K6 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), BACB30NN3K6 (Sps Technologies, Llc Dba PB Fasteners), BACB30NN3K6 (Hi-Shear Corporation), BACB30NN3K6 (Boeing Defence Australia Ltd) and 5 more.
1 possible match (shared part number, not a government interchangeability claim): 5305-01-669-6593. Verify interchangeability with system specifications before substitution.
Key specifications for BACB30NN3K6: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Surface Finish: 63.0 MICROINCHES BEARING SURFACE OF HEAD; Fastener Length: 0.705 INCHES MINIMUM AND 0.735 INCHES MAXIMUM IN. 20 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.