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NSN 5310-01-284-2987Government record, cited
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Washer, Concave5310-01-284-2987

NSN 5310-01-284-2987 · NIIN 012842987
FSC 5310 — Nuts and Washers · FSG 53 — Hardware and Abrasives
Government record, cited
Also searched as  5310-01-284-2987 · 5310012842987 · NIIN 012842987 · 01-284-2987 · FSC 5310 Nuts and Washers · M45595/7-03 · MIL-W-45595/7
Nearby stock numbers  ·
AF 0.417 INCHES MINIMUM AND 0.427 INCHES MAXIMUM IN NUT + WASHER
5310-01-284-2987 — Nuts and Washers
Features
  • Washer,concave — FSC 5310
  • Surface Finish: 32.0 MICROINCHES COUNTERBORE FACE
  • Surface Treatment Document and Classification: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
  • Radius: 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
  • Hardness Rating: 40.0 ROCKWELL C MINIMUM AND 46.0 ROCKWELL C MAXIMUM
  • Style Designator: CONCAVE
  • Material Document and Classification: MIL-S-6758 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-18729 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OVERALL
  • Outside Diameter: 0.608 INCHES MINIMUM AND 0.618 INCHES MAXIMUM IN
Identification
  • NSN: 5310-01-284-2987
  • NIIN: 012842987
  • FSC: 5310 — Nuts and Washers
  • FSG: 53 — Hardware and Abrasives
General Description

The Washer,concave, cataloged under National Stock Number 5310-01-284-2987, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 11 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5310-01-284-2987
Item NameWasher,concave
FSC / FSG5310 / 53 — Nuts and Washers
StatusACTIVE
Surface Finish32.0 MICROINCHES COUNTERBORE FACE
Surface Treatment Document and ClassificationQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
Radius0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
Hardness Rating40.0 ROCKWELL C MINIMUM AND 46.0 ROCKWELL C MAXIMUM
Style DesignatorCONCAVE
Material Document and ClassificationMIL-S-6758 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-18729 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OVERALL
Outside Diameter0.608 INCHES MINIMUM AND 0.618 INCHES MAXIMUM IN
Material Thickness0.106 INCHES MINIMUM AND 0.126 INCHES MAXIMUM IN
Surface TreatmentCADMIUM AND CHROMATE OVERALL
MaterialSTEEL COMP 4130 OR STEEL COMP 8740 OVERALL
Hole Diameter0.417 INCHES MINIMUM AND 0.427 INCHES MAXIMUM IN
Lifecycle & Compliance
Acquisition StatusACTIVE
DEMIL CodeDEMIL A — No Demilitarization Required
HazardNo hazard code in the DLA record (HMIC N)
Criticality CodeX
⇄ Related Items 5
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
5310-01-365-7269 POSSIBLE MATCH
WASHER,CONCAVE
Possible match (shared part number)
5310-01-372-9269 POSSIBLE MATCH
WASHER,CONCAVE
Possible match (shared part number)
5310-01-392-1854 POSSIBLE MATCH
WASHER,CONCAVE
Possible match (shared part number)
5310-01-468-1694 POSSIBLE MATCH
WASHER,CONCAVE
Possible match (shared part number)
5310-01-504-0844 POSSIBLE MATCH
WASHER,CONCAVE
Possible match (shared part number)
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
ReferenceMeaning
M45595/7-03 2/2 Government specification standardization
U.S. Government activity
MIL-W-45595/7 4/1 Identification reference
U.S. Government activity
Related Parts
5310-01-365-7269POSSIBLE MATCH
WASHER,CONCAVE
5310-01-372-9269POSSIBLE MATCH
WASHER,CONCAVE
5310-01-392-1854POSSIBLE MATCH
WASHER,CONCAVE
5310-01-468-1694POSSIBLE MATCH
WASHER,CONCAVE
5310-01-504-0844POSSIBLE MATCH
WASHER,CONCAVE

Frequently Asked Questions

What is NSN 5310-01-284-2987?

NSN 5310-01-284-2987 is a Washer,concave, classified under FSC 5310, Nuts and Washers. Status: active.

What NSN replaces 5310-01-284-2987?

5 possible matches (shared part number, not a government interchangeability claim): 5310-01-365-7269, 5310-01-372-9269, 5310-01-392-1854. Verify interchangeability with system specifications before substitution.

What are the specifications of 5310-01-284-2987?

Key specifications for 5310-01-284-2987: Surface Finish: 32.0 MICROINCHES COUNTERBORE FACE; Surface Treatment Document and Classification: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Radius: 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN; Hardness Rating: 40.0 ROCKWELL C MINIMUM AND 46.0 ROCKWELL C MAXIMUM. 11 specifications are documented in the U.S. Government catalog.

Is NSN 5310-01-284-2987 hazardous material?

No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.

Sources

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.

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✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.
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