The Screw,close Tolerance, cataloged under National Stock Number 5305-00-595-5986, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Northrop Grumman Systems Corporation. Government technical data includes 23 specifications, cited from the U.S. Government catalog. The record lists 5 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-00-595-5986 |
| Primary Part Number | GB510DC4C5D |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Surface Finish | 32.0 MICROINCHES BEARING SURFACE OF HEAD |
| Fastener Length | 0.700 INCHES MINIMUM AND 0.730 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.378 INCHES MINIMUM AND 0.428 INCHES MAXIMUM IN |
| Shank Unthreaded Hole Diameter | 0.076 INCHES MINIMUM AND 0.086 INCHES MAXIMUM FIRST HOLE IN |
| Material Document and Classification | AMS5731 ASSN STD 1ST MATERIAL RESPONSE OR AMS5735 ASSN STD 2ND MATERIAL RESPONSE OR AMS5737 ASSN STD 3RD MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HIGH-TORQUE |
| 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) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 0.590 INCHES MINIMUM AND 0.640 INCHES MAXIMUM FIRST HOLE IN |
| Head Diameter | 0.350 INCHES MINIMUM AND 0.399 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 |
|---|---|
| GB510DC4C5D | Howmet Global Fastening Systems Inc (USA) |
| GB510DC4C5D | Hi-Shear Corporation (USA) |
| GB510DC4C5D | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| GB510DC4C5D PRIMARY | Northrop Grumman Systems Corporation (USA) |
| GB510DC4C5D | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| Reference | Meaning |
|---|---|
| GB510BF4-5 | 5/9 Secondary reference Northrop Grumman Systems Corporation |
| NAS1581C4H5 | 5/9 Secondary reference U.S. Government activity |
| GB510DC4C5D | 5/2 Secondary reference U.S. Government activity |
| 76121-4-5 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| 76121-4-5 | 5/9 Secondary reference U.S. Government activity |
| GB510DC4C5D | 5/9 Secondary reference Abounding Security Inc Div of Maa Corp |
NSN 5305-00-595-5986 is a Screw,close Tolerance, manufactured by Northrop Grumman Systems Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-595-5986 has 5 manufacturer part numbers on file: GB510DC4C5D (Howmet Global Fastening Systems Inc), GB510DC4C5D (Hi-Shear Corporation), GB510DC4C5D (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), GB510DC4C5D (Northrop Grumman Systems Corporation), GB510DC4C5D (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc).
Key specifications for GB510DC4C5D: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Surface Finish: 32.0 MICROINCHES BEARING SURFACE OF HEAD; Fastener Length: 0.700 INCHES MINIMUM AND 0.730 INCHES MAXIMUM IN. 23 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.