The Washer,flat, cataloged under National Stock Number 5310-01-555-5018, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Fastenal Company Dba Fastenal Co. Government technical data includes 12 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 5310-01-555-5018 |
| Primary Part Number | 33863 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Fastenal Company Dba Fastenal Co |
| Status | ACTIVE |
| Surface Treatment Document and Classification | ASTMB633, SC1 TYPE 2 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 1.750 INCHES NOMINAL IN |
| Special Test Features | BOLT COMPATIBILITY: GRADE 8, BOLT SIZE: 5/8" |
| Supplementary Features | PRODUCT WEIGHT: 0.077LBS LBS |
| Material Document and Classification | ASTMF436 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | ZINC OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.688 INCHES NOMINAL IN |
| Thickness | 0.134 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL D — Destroy Item |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 33863 PRIMARY | Fastenal Company Dba Fastenal Co (USA) |
| Reference | Meaning |
|---|---|
| 12759-00461 | C/1 Advisory reference — outside the item-of-supply concept Fastenal Company Dba Fastenal Co |
NSN 5310-01-555-5018 is a Washer,flat, manufactured by Fastenal Company Dba Fastenal Co, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-555-5018 has 1 manufacturer part number on file: 33863 (Fastenal Company Dba Fastenal Co).
2 possible matches (shared part number, not a government interchangeability claim): 4920-01-583-6616, 3460-01-683-1886. Verify interchangeability with system specifications before substitution.
Key specifications for 33863: Surface Treatment Document and Classification: ASTMB633, SC1 TYPE 2 ASSN STD SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 1.750 INCHES NOMINAL IN; Special Test Features: BOLT COMPATIBILITY: GRADE 8, BOLT SIZE: 5/8"; Supplementary Features: PRODUCT WEIGHT: 0.077LBS LBS. 12 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.
NSN 5310-01-555-5018 has DEMIL Code D. Demilitarization may be required before disposal or transfer to non-military entities.
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.