The Washer,finishing, cataloged under National Stock Number 5310-01-107-5174, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Skyline Industries, Inc. Government technical data includes 8 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-107-5174 |
| Primary Part Number | SI668C7 |
| Item Name | Washer,finishing |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Skyline Industries, Inc |
| Status | ACTIVE |
| Style Designator | FINISHING |
| Material Document and Classification | MIL-S-5059,COND 1/2 HARD MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.437 INCHES NOMINAL IN |
| Material Thickness | 0.016 INCHES NOMINAL IN |
| Recess Diameter | 0.234 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN |
| Material | STEEL COMP 301 OVERALL |
| Hole Diameter | 0.107 INCHES MINIMUM AND 0.117 INCHES MAXIMUM IN |
| Recess Angle | 100.0 DEGREES NOMINAL |
| 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 |
|---|---|
| SI668C7 PRIMARY | Skyline Industries, Inc (USA) |
| Reference | Meaning |
|---|---|
| CG599C7 | 3/2 Design control — primary reference U.S. Government activity |
| C668C7 | 7/2 Vendor item drawing reference U.S. Government activity |
NSN 5310-01-107-5174 is a Washer,finishing, manufactured by Skyline Industries, Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-107-5174 has 1 manufacturer part number on file: SI668C7 (Skyline Industries, Inc).
Key specifications for SI668C7: Overall Height: 0.040 INCHES MINIMUM AND 0.056 INCHES MAXIMUM IN; Style Designator: FINISHING; Material Document and Classification: MIL-S-5059,COND 1/2 HARD MIL SPEC SINGLE MATERIAL RESPONSE OVERALL; Outside Diameter: 0.437 INCHES NOMINAL IN. 8 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.