The Washer,flat, cataloged under National Stock Number 5310-00-541-6505, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Mack Trucks Inc Parts Opn. Government technical data includes 8 specifications, cited from the U.S. Government catalog. The record lists 5 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-541-6505 |
| Primary Part Number | 12Y4517 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Mack Trucks Inc Parts Opn |
| Status | ACTIVE |
| Overall Diameter | 5.875 INCHES NOMINAL IN |
| Material Document and Classification | QQ-S-633,FS 10-15-CANCELED FED SPEC 1ST MATERIAL RESPONSE AND QQ-S-633,FS1020-CANCELED FED SPEC 2ND MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 1015 AND STEEL COMP 1020 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.812 INCHES NOMINAL IN |
| Thickness | 0.500 INCHES NOMINAL 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 |
|---|---|
| 12Y4517 PRIMARY | Mack Trucks Inc Parts Opn (USA) |
| 12Y4517 PRIMARY | Kenworth Truck Co a Div of Paccar Inc (USA) |
| 12Y4517 PRIMARY | Garwood/feller Inc Garwood Winch Div (USA) |
| E2436 PRIMARY | Appleton Marine Inc (USA) |
| 42E12Y4517 PRIMARY | Fwd Seagrave Holdings Lp (USA) |
| Reference | Meaning |
|---|---|
| BB21725 | 5/9 Secondary reference Diamond Reo Truck Co |
| 12Y4517 | 5/9 Secondary reference Kaitlin Corp |
| 12Y4517 | 5/9 Secondary reference Walter Motor Truck Co |
| 12Y4517 | 5/9 Secondary reference Paccar Government Group Co Yarrow Bay Office Pk |
NSN 5310-00-541-6505 is a Washer,flat, manufactured by Mack Trucks Inc Parts Opn, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-541-6505 has 5 manufacturer part numbers on file: 12Y4517 (Mack Trucks Inc Parts Opn), 12Y4517 (Kenworth Truck Co a Div of Paccar Inc), 12Y4517 (Garwood/feller Inc Garwood Winch Div), E2436 (Appleton Marine Inc), 42E12Y4517 (Fwd Seagrave Holdings Lp).
Key specifications for 12Y4517: Overall Diameter: 5.875 INCHES NOMINAL IN; Material Document and Classification: QQ-S-633,FS 10-15-CANCELED FED SPEC 1ST MATERIAL RESPONSE AND QQ-S-633,FS1020-CANCELED FED SPEC 2ND MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR; Peripheral Shape Style: ROUND. 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.