The Washer,key, cataloged under National Stock Number 5310-00-989-5977, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Zf Active Safety and Electronics Us Llc Div Trw Commercial Steering Systems. Government technical data includes 9 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-989-5977 |
| Primary Part Number | 028258 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Zf Active Safety and Electronics Us Llc Div Trw Commercial Steering Systems |
| Status | ACTIVE |
| Internal Straight Key Width | 0.175 INCHES MINIMUM AND 0.180 INCHES MAXIMUM IN |
| Distance From Centerline to Top of Internal Key | 0.400 INCHES NOMINAL IN |
| Style Designator | KEY |
| Material Document and Classification | AISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 1.350 INCHES MINIMUM AND 1.390 INCHES MAXIMUM IN |
| Material Thickness | 0.0747 INCHES NOMINAL IN |
| Material | STEEL COMP 1010 OVERALL |
| Internal Key Quantity | 1 |
| Hole Diameter | 1.005 INCHES MINIMUM AND 1.025 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 |
|---|---|
| 028258 PRIMARY | Zf Active Safety and Electronics Us Llc Div Trw Commercial Steering Systems (USA) |
NSN 5310-00-989-5977 is a Washer,key, manufactured by Zf Active Safety and Electronics Us Llc Div Trw Commercial Steering Systems, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-989-5977 has 1 manufacturer part number on file: 028258 (Zf Active Safety and Electronics Us Llc Div Trw Commercial Steering Systems).
Key specifications for 028258: Internal Straight Key Width: 0.175 INCHES MINIMUM AND 0.180 INCHES MAXIMUM IN; Distance From Centerline to Top of Internal Key: 0.400 INCHES NOMINAL IN; Style Designator: KEY; Material Document and Classification: AISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 9 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.