The Washer,spring Tension, cataloged under National Stock Number 5310-00-386-9625, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Dynalec Corporation. Government technical data includes 6 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-386-9625 |
| Primary Part Number | K740 |
| Item Name | Washer,spring Tension |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Dynalec Corporation |
| Status | ACTIVE |
| Style Designator | SPRING TENSION |
| Material Document and Classification | QQ-C-533 FED SPEC ALL MATERIAL RESPONSES OVERALL |
| Outside Diameter | 0.599 INCHES MINIMUM AND 0.601 INCHES MAXIMUM IN |
| Material Thickness | 0.008 INCHES NOMINAL IN |
| Material | COPPER ALLOY 170 OR COPPER ALLOY 172 OVERALL |
| Hole Diameter | 0.1985 INCHES MINIMUM AND 0.2015 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 |
|---|---|
| K740 PRIMARY | Dynalec Corporation (USA) |
| Reference | Meaning |
|---|---|
| K740 | 3/9 Design control — primary reference The Electric Tachometer Corp. |
NSN 5310-00-386-9625 is a Washer,spring Tension, manufactured by Dynalec Corporation, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-386-9625 has 1 manufacturer part number on file: K740 (Dynalec Corporation).
2 possible matches (shared part number, not a government interchangeability claim): 5950-01-407-1594, 7025-01-695-6047. Verify interchangeability with system specifications before substitution.
Key specifications for K740: Overall Height: 0.089 INCHES MINIMUM AND 0.099 INCHES MAXIMUM IN; Style Designator: SPRING TENSION; Material Document and Classification: QQ-C-533 FED SPEC ALL MATERIAL RESPONSES OVERALL; Outside Diameter: 0.599 INCHES MINIMUM AND 0.601 INCHES MAXIMUM IN. 6 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.