The Washer,flat, cataloged under National Stock Number 5310-01-522-7975, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Sps Technologies, Llc Dba PB Fasteners. Government technical data includes 10 specifications, cited from the U.S. Government catalog. The record lists 7 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-522-7975 |
| Primary Part Number | BACW10BP4NDP |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Sps Technologies, Llc Dba PB Fasteners |
| Status | ACTIVE |
| Overall Diameter | 0.475 INCHES MINIMUM AND 0.495 INCHES MAXIMUM IN |
| Material Document and Classification | AMS5525 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | CADMIUM OVERALL |
| Minimum Tensile Strength | 140000 POUNDS PER SQUARE INCH LBS |
| Peripheral Shape Style | ROUND |
| Material | IRON ALLOY 660 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.250 INCHES MINIMUM AND 0.261 INCHES MAXIMUM IN |
| Thickness | 0.012 INCHES MINIMUM AND 0.020 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 |
|---|---|
| BACW10BP4NDP PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| NTA11551-4NDP | Leonardo Spa Aeronautics Division - Pomigliano D'arco Site (ITA) |
| BACW10BP4NDP | Boeing Defence Australia Ltd Div Defense, Space & Security (AUS) |
| BACW10BP4NDP PRIMARY | Moeller Manufacturing & Supply, Llc (USA) |
| BACW10BP4NDP PRIMARY | Component Products Corporation Dba Component Products Corp (USA) |
| BACW10BP4NDP | Boeing Defence Australia Ltd (AUS) |
| BACW10BP4NDP PRIMARY | Anillo Industries Llc (USA) |
| Reference | Meaning |
|---|---|
| BACW10BP4NDP | 7/2 Vendor item drawing reference U.S. Government activity |
NSN 5310-01-522-7975 is a Washer,flat, manufactured by Sps Technologies, Llc Dba PB Fasteners, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-522-7975 has 7 manufacturer part numbers on file: BACW10BP4NDP (Sps Technologies, Llc Dba PB Fasteners), NTA11551-4NDP (Leonardo Spa Aeronautics Division - Pomigliano D'arco Site), BACW10BP4NDP (Boeing Defence Australia Ltd Div Defense, Space & Security), BACW10BP4NDP (Moeller Manufacturing & Supply, Llc), BACW10BP4NDP (Component Products Corporation Dba Component Products Corp) and 2 more.
1 possible match (shared part number, not a government interchangeability claim): 5310-01-687-8858. Verify interchangeability with system specifications before substitution.
Key specifications for BACW10BP4NDP: Overall Diameter: 0.475 INCHES MINIMUM AND 0.495 INCHES MAXIMUM IN; Material Document and Classification: AMS5525 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR; Special Features: HEAT TREAT TO MINIMUM TENSILE STRENGTH PER AMS-H-6875; SERVICE TEMPERATURE 450.0 DEGREES F; USED ON TRANSMISSION INSTALLATION-INBOARD T.E. FLAP DRIVE OUTBOARD (INBOARD T.E. FLAP TRANSMISSIONS ONLY). 10 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.