The Screw,close Tolerance, cataloged under National Stock Number 5305-00-421-6648, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 19 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-00-421-6648 |
| Primary Part Number | 3MA336PA16 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Fastener Length | 1.813 INCHES MINIMUM AND 1.860 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | P.S.13143 CLASS 3, TYPE II CAGE 76301 MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.615 INCHES MINIMUM AND 0.682 INCHES MAXIMUM IN |
| Hardness Rating | 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL |
| Material Document and Classification | MIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5000 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-8503 MIL SPEC 3RD MATERIAL RESPONSE OR MIL-S-6098 MIL SPEC 4TH MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 5TH MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.188 INCHES NOMINAL IN |
| Grip Diameter | 0.3733 INCHES MINIMUM AND 0.3744 INCHES MAXIMUM IN |
| Surface Treatment | ALUMINUM OVERALL |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| 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 | 24 |
| Material | STEEL COMP 4140 OR STEEL COMP E4340 OR STEEL COMP 6150 OR STEEL COMP 8735 OR STEEL COMP 8740 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.752 INCHES MINIMUM AND 0.762 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 |
|---|---|
| 3MA336PA16 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| 3MA336PA16 | Huck International, Inc (USA) |
| 3MA336PA16 | Reed and Prince Mfg Co (USA) |
| 3MA336PA16 PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| 3MA336PA16 | 5/9 Secondary reference Newport Aeronautical Sales |
| 3MFRA336CFA16 | 5/9 Secondary reference The Boeing Company Div Defense |
| 3MA336CFA16 | 5/9 Secondary reference The Boeing Company Div Defense |
| 3MA336PA16 | 5/9 Secondary reference U.S. Government activity |
| 3MA336PA16 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
NSN 5305-00-421-6648 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-421-6648 has 4 manufacturer part numbers on file: 3MA336PA16 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), 3MA336PA16 (Huck International, Inc), 3MA336PA16 (Reed and Prince Mfg Co), 3MA336PA16 (The Boeing Company Div Defense).
Key specifications for 3MA336PA16: Fastener Length: 1.813 INCHES MINIMUM AND 1.860 INCHES MAXIMUM IN; Surface Treatment Document and Classification: P.S.13143 CLASS 3, TYPE II CAGE 76301 MFR REF SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.615 INCHES MINIMUM AND 0.682 INCHES MAXIMUM IN; Hardness Rating: 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM 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.