The Pin,spring, cataloged under National Stock Number 5315-00-734-5641, is classified within Federal Supply Class 5315 (Nails, Machine Keys, and Pins) of the Hardware and Abrasives group. The manufacturer of record is Leonardo Spa Helicopters Division - Production Site. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5315-00-734-5641 |
| Primary Part Number | NAS561P4-20 |
| Item Name | Pin,spring |
| FSC / FSG | 5315 / 53 — Nails, Machine Keys, and Pins |
| Manufacturer | Leonardo Spa Helicopters Division - Production Site |
| Status | ACTIVE |
| Hardness Rating | 73.6 ROCKWELL A MINIMUM AND 78.0 ROCKWELL A MAXIMUM OVERALL |
| Style Designator | SLOTTED |
| Material Document and Classification | 66,COMP 1070 THRU 1095 FED STD SINGLE MATERIAL RESPONSE OVERALL |
| Diameter | 0.125 INCHES NOMINAL IN |
| Material Thickness | 0.028 INCHES NOMINAL IN |
| Departure From Cited Designator | AS MODIFIED BY SPECIAL FEATURES |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Material | STEEL OVERALL |
| 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 |
|---|---|
| NAS561P4-20 | Leonardo Spa Helicopters Division - Production Site (ITA) |
| Reference | Meaning |
|---|---|
| NAS561P4-20 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5315-00-734-5641 is a Pin,spring, manufactured by Leonardo Spa Helicopters Division - Production Site, classified under FSC 5315, Nails, Machine Keys, and Pins. Status: active.
NSN 5315-00-734-5641 has 1 manufacturer part number on file: NAS561P4-20 (Leonardo Spa Helicopters Division - Production Site).
Key specifications for NAS561P4-20: Hardness Rating: 73.6 ROCKWELL A MINIMUM AND 78.0 ROCKWELL A MAXIMUM OVERALL; Style Designator: SLOTTED; Material Document and Classification: 66,COMP 1070 THRU 1095 FED STD SINGLE MATERIAL RESPONSE OVERALL; Diameter: 0.125 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.