The Washer,flat, cataloged under National Stock Number 5310-01-236-2139, 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 11 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-236-2139 |
| Primary Part Number | BACW10BP20P |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Sps Technologies, Llc Dba PB Fasteners |
| Status | ACTIVE |
| Surface Treatment Document and Classification | AMS 2416 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 2.125 INCHES MINIMUM AND 2.145 INCHES MAXIMUM IN |
| Hardness Rating | 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM |
| Material Document and Classification | MIL-S-18729 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-18728 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-18733 MIL SPEC 3RD MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | NICKEL AND CADMIUM OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 4130 OR STEEL COMP 8630 OR STEEL COMP 4135 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 1.250 INCHES MINIMUM AND 1.261 INCHES MAXIMUM IN |
| Thickness | 0.092 INCHES MINIMUM AND 0.108 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 |
|---|---|
| BACW10BP20P | Sps Technologies, Llc Dba PB Fasteners (USA) |
| BACW10BP20P | Anillo Industries Llc (USA) |
| BACW10BP20P | Moeller Manufacturing & Supply, Llc (USA) |
| Reference | Meaning |
|---|---|
| BACW10BP20P | 5/9 Secondary reference Mamco Mfg Co Inc |
| BACW10BP20P | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-01-236-2139 is a Washer,flat, manufactured by Sps Technologies, Llc Dba PB Fasteners, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-236-2139 has 3 manufacturer part numbers on file: BACW10BP20P (Sps Technologies, Llc Dba PB Fasteners), BACW10BP20P (Anillo Industries Llc), BACW10BP20P (Moeller Manufacturing & Supply, Llc).
Key specifications for BACW10BP20P: Surface Treatment Document and Classification: AMS 2416 ASSN STD SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 2.125 INCHES MINIMUM AND 2.145 INCHES MAXIMUM IN; Hardness Rating: 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM; Material Document and Classification: MIL-S-18729 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-18728 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-18733 MIL SPEC 3RD MATERIAL RESPONSE OVERALL. 11 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.