The Screw,cap,socket Head, cataloged under National Stock Number 5305-00-040-9684, 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 17 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-040-9684 |
| Primary Part Number | GS551B3S29 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Fastener Length | 1.828 INCHES MINIMUM AND 1.875 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416,TY 1,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.437 INCHES MINIMUM AND 0.516 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 6300 ASSN STD 14TH MATERIAL RESPONSE OR MIL-S-6050 MIL SPEC 2ND MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Locking Feature | PATCH OR PELLET OR STRIP THREADS |
| Surface Treatment | CADMIUM OVERALL |
| Minimum Tensile Strength | 125000 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 | 32 |
| Material | STEEL COMP 4037 OR STEEL COMP 8630 OVERALL |
| Thread Series Designator | UNF |
| Head Diameter | 0.327 INCHES MINIMUM AND 0.385 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 |
|---|---|
| GS551B3S29 | Nylok Llc (USA) |
| GS551B3S29 | Long-Lok Llc (USA) |
| GS551B3S29 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| GS551B3S29 | Nylok Llc (USA) |
| GS551B3S29 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| Reference | Meaning |
|---|---|
| GS551B3S29 | 5/9 Secondary reference Torkon Fastener Corp |
| GS551B3S29 | 5/9 Secondary reference Oak Industries Inc Switch Div |
| GS551B3S29 | 5/9 Secondary reference Dozier Mfg Co |
NSN 5305-00-040-9684 is a Screw,cap,socket Head, manufactured by Northrop Grumman Systems Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-040-9684 has 5 manufacturer part numbers on file: GS551B3S29 (Nylok Llc), GS551B3S29 (Long-Lok Llc), GS551B3S29 (Sps Technologies, Llc Dba PB Fasteners), GS551B3S29 (Nylok Llc), GS551B3S29 (Northrop Grumman Systems Corporation).
Key specifications for GS551B3S29: Fastener Length: 1.828 INCHES MINIMUM AND 1.875 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-416,TY 1,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.437 INCHES MINIMUM AND 0.516 INCHES MAXIMUM IN; Material Document and Classification: AMS 6300 ASSN STD 14TH MATERIAL RESPONSE OR MIL-S-6050 MIL SPEC 2ND MATERIAL RESPONSE OVERALL. 17 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.