The Washer,key, cataloged under National Stock Number 5310-00-209-4125, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Borg-Warner Corp Marvel-Schebler/tillotson Div. Government technical data includes 11 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 5 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.
| Parameter | Value |
|---|---|
| NSN | 5310-00-209-4125 |
| Primary Part Number | A78-121 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — No Item Name Available |
| Manufacturer | Borg-Warner Corp Marvel-Schebler/tillotson Div |
| Status | CANCELLED |
| Hardness Rating | 30.0 ROCKWELL B MINIMUM AND 50.0 ROCKWELL B MAXIMUM |
| Outside Diameter | 0.370 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN |
| Hole Diameter | 0.191 INCHES MINIMUM AND 0.196 INCHES MAXIMUM IN |
| External Key Quantity | 6 |
| Surface Treatment | CADMIUM OVERALL |
| Material | STEEL OVERALL |
| Overall Distance Including Keys | 0.557 INCHES MINIMUM AND 0.567 INCHES MAXIMUM IN |
| Material Thickness | 0.026 INCHES MINIMUM AND 0.036 INCHES MAXIMUM IN |
| Style Designator | KEY |
| Surface Treatment Document and Classification | AN-QQ-P-421 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| External Straight Key Width | 0.104 INCHES MINIMUM AND 0.114 INCHES MAXIMUM IN |
| Acquisition Status | CANCELLED |
| HAZMAT | No |
NSN 5310-00-209-4125 is a Washer,key, manufactured by Borg-Warner Corp Marvel-Schebler/tillotson Div, classified under FSC 5310 (No Item Name Available). Status: cancelled.
NSN 5310-00-209-4125 has 2 cross-referenced part numbers: A78-121 (Borg-Warner Corp Marvel-Schebler/tillotson Div), 78-121 (Borg-Warner Corp Marvel-Schebler/tillotson Div).
There are 5 known substitutes for 5310-00-209-4125: 2815-00-036-5413, 5975-00-284-6402, 2990-00-303-7804 and 2 more. Verify interchangeability with system specifications before substitution.
Key specifications for A78-121: Hardness Rating: 30.0 ROCKWELL B MINIMUM AND 50.0 ROCKWELL B MAXIMUM; Outside Diameter: 0.370 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN; Hole Diameter: 0.191 INCHES MINIMUM AND 0.196 INCHES MAXIMUM IN; External Key Quantity: 6. 11 total characteristics are documented in the Federal Logistics Information System.
NSN 5310-00-209-4125 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.