The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-699-9905, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Curtiss-Wright Flow Control Service, Llc Dba Engineered Arresting Systems - Esco Div Cw Flow Control Svc Llc Dba. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5305-01-699-9905 |
| Primary Part Number | 06657-179 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Curtiss-Wright Flow Control Service, Llc Dba Engineered Arresting Systems - Esco Div Cw Flow Control Svc Llc Dba |
| Status | ACTIVE |
| Width Across Flats | 0.62 INCHES NOMINAL IN |
| Fastener Length | 5.984 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | ASTM B 633 INTERNATIONAL STD/SPEC ALL TREATMENT RESPONSES OVERALL |
| Thread Length | 5.75 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | ZINC OVERALL |
| Internal Drive Style | HEXAGON |
| Countersink Angle | 80.0 DEGREES MINIMUM AND 84.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 16 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.720 INCHES MINIMUM AND 0.781 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 |
|---|---|
| 06657-179 | Safran Aerosystems (FRA) |
| 06657-179 PRIMARY | Curtiss-Wright Flow Control Service, Llc Dba Engineered Arresting Systems - Esco Div Cw Flow Control Svc Llc Dba (USA) |
| Reference | Meaning |
|---|---|
| MS24667 REV D | 5/9 Secondary reference U.S. Government activity |
| NASM24667 | D/9 Drawing number reference only U.S. Government activity |
NSN 5305-01-699-9905 is a Screw,cap,socket Head, manufactured by Curtiss-Wright Flow Control Service, Llc Dba Engineered Arresting Systems - Esco Div Cw Flow Control Svc Llc Dba, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-699-9905 has 2 manufacturer part numbers on file: 06657-179 (Safran Aerosystems), 06657-179 (Curtiss-Wright Flow Control Service, Llc Dba Engineered Arresting Systems - Esco Div Cw Flow Control Svc Llc Dba).
1 possible match (shared part number, not a government interchangeability claim): 5305-01-734-1834. Verify interchangeability with system specifications before substitution.
Key specifications for 06657-179: Width Across Flats: 0.62 INCHES NOMINAL IN; Fastener Length: 5.984 INCHES NOMINAL IN; Surface Treatment Document and Classification: ASTM B 633 INTERNATIONAL STD/SPEC ALL TREATMENT RESPONSES OVERALL; Thread Length: 5.75 INCHES NOMINAL IN. 15 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.