The Screw,close Tolerance, cataloged under National Stock Number 5305-01-356-7209, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems. Government technical data includes 18 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-356-7209 |
| Primary Part Number | 03A173-3-5 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems |
| Status | ACTIVE |
| Fastener Length | 0.642 INCHES MINIMUM AND 0.672 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE FASTENER |
| Thread Length | 0.345 INCHES NOMINAL IN |
| Material Document and Classification | AMS5737 ASSN STD 1ST MATERIAL RESPONSE OR AMS5731 ASSN STD 2ND MATERIAL RESPONSE FASTENER |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN |
| Grip Diameter | 0.1885 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE FASTENER |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | OFFSET CRUCIFORM (TORQUE SET) |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | IRON ALLOY 660 FASTENER |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.328 INCHES MINIMUM AND 0.338 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 |
|---|---|
| HR239-3-5 | Hi-Shear Corporation (USA) |
| HR239-3-5 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| SC3103-3-5 | Howmet Global Fastening Systems Inc (USA) |
| 03A173-3-5 PRIMARY | Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems (USA) |
| AIC1651-3-5 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| E008-3-5 | Huck International, Inc (USA) |
| BF0015HC3-3-5 | Lfc Industries, Inc. (USA) |
| PBF1416-3-5 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| 03A173-3-5 | 5/9 Secondary reference Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems |
| SLB216-3-5 | 5/9 Secondary reference Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok |
| 123742-3-5 | 5/2 Secondary reference U.S. Government activity |
| E008-3-5 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-356-7209 is a Screw,close Tolerance, manufactured by Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-356-7209 has 8 manufacturer part numbers on file: HR239-3-5 (Hi-Shear Corporation), HR239-3-5 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), SC3103-3-5 (Howmet Global Fastening Systems Inc), 03A173-3-5 (Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems), AIC1651-3-5 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company) and 3 more.
Key specifications for 03A173-3-5: Fastener Length: 0.642 INCHES MINIMUM AND 0.672 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE FASTENER; Thread Length: 0.345 INCHES NOMINAL IN; Material Document and Classification: AMS5737 ASSN STD 1ST MATERIAL RESPONSE OR AMS5731 ASSN STD 2ND MATERIAL RESPONSE FASTENER. 18 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.