Surface Treatment Document and Classification: ASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
Style Designator: SPRING TENSION
Material Document and Classification: MIL-S-5059,1/2 HARD MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-25043,COND A MIL SPEC 2ND MATERIAL RESPONSE OR AMS 5528 ASSN STD 2ND MATERIAL RESPONSE OVERALL
Outside Diameter: 0.355 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
Material Thickness: 0.019 INCHES MINIMUM AND 0.021 INCHES MAXIMUM IN
Surface Treatment: PASSIVATE OVERALL
Material: STEEL COMP 302 OR STEEL COMP 631 OVERALL
Identification
NSN: 5310-01-261-0505
NIIN: 012610505
FSC: 5310 — Nuts and Washers
FSG: 53 — Hardware and Abrasives
General Description
The Washer,spring Tension, cataloged under National Stock Number 5310-01-261-0505, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 8 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 11 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
Technical Specifications
Parameter
Value
NSN
5310-01-261-0505
Item Name
Washer,spring Tension
FSC / FSG
5310 / 53 — Nuts and Washers
Status
ACTIVE
Surface Treatment Document and Classification
ASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
Style Designator
SPRING TENSION
Material Document and Classification
MIL-S-5059,1/2 HARD MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-25043,COND A MIL SPEC 2ND MATERIAL RESPONSE OR AMS 5528 ASSN STD 2ND MATERIAL RESPONSE OVERALL
Outside Diameter
0.355 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
Material Thickness
0.019 INCHES MINIMUM AND 0.021 INCHES MAXIMUM IN
Surface Treatment
PASSIVATE OVERALL
Material
STEEL COMP 302 OR STEEL COMP 631 OVERALL
Hole Diameter
0.190 INCHES MINIMUM AND 0.210 INCHES MAXIMUM IN
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL A — No Demilitarization Required
Hazard
No hazard code in the DLA record (HMIC N)
Criticality Code
X
⇄Related Items11
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
5310-01-270-6369POSSIBLE MATCH
WASHER,SPRING TENSION
Possible match (shared part number)
5310-01-284-7607POSSIBLE MATCH
WASHER,SPRING TENSION
Possible match (shared part number)
5310-01-296-9815POSSIBLE MATCH
WASHER,SPRING TENSION
Possible match (shared part number)
5310-01-306-8574POSSIBLE MATCH
WASHER,SPRING TENSION
Possible match (shared part number)
5310-01-312-1057POSSIBLE MATCH
WASHER,SPRING TENSION
Possible match (shared part number)
5310-01-312-1059POSSIBLE MATCH
WASHER,SPRING TENSION
Possible match (shared part number)
5310-01-330-8301POSSIBLE MATCH
WASHER,SPRING TENSION
Possible match (shared part number)
5310-01-343-6011POSSIBLE MATCH
WASHER,SPRING TENSION
Possible match (shared part number)
5310-01-345-8534POSSIBLE MATCH
WASHER,SPRING TENSION
Possible match (shared part number)
5310-01-360-5240POSSIBLE MATCH
WASHER,SPRING TENSION
Possible match (shared part number)
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
MIL-W-12133/2
4/1Identification reference
U.S. Government activity
M12133/2-190
2/2Government specification standardization
U.S. Government activity
Related Parts
5310-01-270-6369POSSIBLE MATCH
WASHER,SPRING TENSION
5310-01-284-7607POSSIBLE MATCH
WASHER,SPRING TENSION
5310-01-296-9815POSSIBLE MATCH
WASHER,SPRING TENSION
5310-01-306-8574POSSIBLE MATCH
WASHER,SPRING TENSION
5310-01-312-1057POSSIBLE MATCH
WASHER,SPRING TENSION
5310-01-312-1059POSSIBLE MATCH
WASHER,SPRING TENSION
5310-01-330-8301POSSIBLE MATCH
WASHER,SPRING TENSION
5310-01-343-6011POSSIBLE MATCH
WASHER,SPRING TENSION
5310-01-345-8534POSSIBLE MATCH
WASHER,SPRING TENSION
5310-01-360-5240POSSIBLE MATCH
WASHER,SPRING TENSION
5310-01-387-2819POSSIBLE MATCH
WASHER,SPRING TENSION
Frequently Asked Questions
What is NSN 5310-01-261-0505?
NSN 5310-01-261-0505 is a Washer,spring Tension, classified under FSC 5310, Nuts and Washers. Status: active.
What NSN replaces 5310-01-261-0505?
11 possible matches (shared part number, not a government interchangeability claim): 5310-01-270-6369, 5310-01-284-7607, 5310-01-296-9815. Verify interchangeability with system specifications before substitution.
What are the specifications of 5310-01-261-0505?
Key specifications for 5310-01-261-0505: Overall Height: 0.025 INCHES MINIMUM AND 0.035 INCHES MAXIMUM IN; Surface Treatment Document and Classification: ASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL; Style Designator: SPRING TENSION; Material Document and Classification: MIL-S-5059,1/2 HARD MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-25043,COND A MIL SPEC 2ND MATERIAL RESPONSE OR AMS 5528 ASSN STD 2ND MATERIAL RESPONSE OVERALL. 8 specifications are documented in the U.S. Government catalog.
Is NSN 5310-01-261-0505 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.
✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.