PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

FF-W-84Washer,lock

Federal Specifications Promulgated by General Services Administration Washington DC · NSN 5310-01-125-1229 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-01-125-1229 — this item is cataloged by the U.S. Government under National Stock Number 5310-01-125-1229. Primary manufacturer part number: FF-W-84.
Features
  • Washer,lock — FSC 5310
  • Material Thickness: 0.140 INCHES MINIMUM IN
  • Hardness Rating: 35.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM
  • Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
  • Style Designator: SPLIT HELICAL-RIGHT HAND
  • Nondefinitive Spec/std Data: C CLASS AND 5 STYLE
  • Surface Treatment: PASSIVATE OVERALL
  • Material: STEEL COMP 301 OR STEEL COMP 302 OR STEEL COMP 302B OR STEEL COMP 303 OR STEEL COMP 303SE OR STEEL COMP 304 OR STEEL COMP 304L OR STEEL COMP 305 OR STEEL COMP 308 OR STEEL COMP 309 OR STEEL COMP 309S OR STEEL COMP 310 OR STEEL COMP 310S OR STEEL COMP 314 OR STEEL COMP 316 OR STEEL COMP 316L OR STEEL COMP 317 OR STEEL COMP 321 OR STEEL COMP 347 OR STEEL COMP 348 OR STEEL COMP 384 OR STEEL COMP 385 OVERALL
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Comp 301 or Steel Comp 302 or Steel Comp 302b or Steel Comp 303 or Steel Comp 303SE or Steel Comp 304 or Steel Comp 304l or Steel Comp 305 or Steel Comp 308 or Steel Comp 309 or Steel Comp 309s or Steel Comp 310 or Steel Comp 310s or Steel Comp 314 or Steel Comp 316 or Steel Comp 316l or Steel Comp 317 or Steel Comp 321 or Steel Comp 347 or Steel Comp 348 or Steel Comp 384 or Steel Comp 385 Overall construction
General Description

The Washer,lock, cataloged under National Stock Number 5310-01-125-1229, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Federal Specifications Promulgated by General Services Administration Washington DC. Government technical data includes 10 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 7 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5310-01-125-1229
Primary Part NumberFF-W-84
Item NameWasher,lock
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerFederal Specifications Promulgated by General Services Administration Washington DC
StatusACTIVE
Material Thickness0.140 INCHES MINIMUM IN
Hardness Rating35.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM
Surface Treatment Document and ClassificationQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
Style DesignatorSPLIT HELICAL-RIGHT HAND
Nondefinitive Spec/std DataC CLASS AND 5 STYLE
Surface TreatmentPASSIVATE OVERALL
MaterialSTEEL COMP 301 OR STEEL COMP 302 OR STEEL COMP 302B OR STEEL COMP 303 OR STEEL COMP 303SE OR STEEL COMP 304 OR STEEL COMP 304L OR STEEL COMP 305 OR STEEL COMP 308 OR STEEL COMP 309 OR STEEL COMP 309S OR STEEL COMP 310 OR STEEL COMP 310S OR STEEL COMP 314 OR STEEL COMP 316 OR STEEL COMP 316L OR STEEL COMP 317 OR STEEL COMP 321 OR STEEL COMP 347 OR STEEL COMP 348 OR STEEL COMP 384 OR STEEL COMP 385 OVERALL
Material Document and Classification66 FED STD ALL MATERIAL RESPONSES OVERALL
Outside Diameter0.647 INCHES MAXIMUM IN
Hole Diameter0.443 INCHES MINIMUM AND 0.455 INCHES MAXIMUM IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 7
2925-00-144-319211498 INTERCHANGEABLE
Spacer,bearing
Honeywell Intl Inc Defense Avionics Systems
5995-00-324-9267SM-C-187635 INTERCHANGEABLE
Cable Assembly,special Purpose,e
Us Army Communications & Electronics Materiel Readiness Command Logistics Engineering Dir
3120-00-447-355411498 INTERCHANGEABLE
Bearing,sleeve
Dressta North America Ltd
2805-00-625-2444114-0098 INTERCHANGEABLE
Connecting Rod,piston
Cummins Power Generation Inc.
5315-01-157-755611498 INTERCHANGEABLE
Pin
Westerbeke Corporation
4320-01-205-1109 INTERCHANGEABLE
Ring,wearing
3040-01-220-994511498 INTERCHANGEABLE
Shaft,shouldered
DP Manufacturing Inc.
Cross-Reference Index
Part NumberManufacturer
FF-W-84 Federal Specifications Promulgated by General Services Administration Washington DC (USA)
MS51848-53 Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M
MS51848E-53 Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M
11498 Worcester Controls Corp P O Box 2609 Cookeville Tn 385022609 (USA)
Related Parts
2925-00-144-3192INTERCHANGEABLE
SPACER,BEARING
11498
5995-00-324-9267INTERCHANGEABLE
CABLE ASSEMBLY,SPECIAL PURPOSE,E
SM-C-187635
3120-00-447-3554INTERCHANGEABLE
BEARING,SLEEVE
11498
2805-00-625-2444INTERCHANGEABLE
CONNECTING ROD,PISTON
114-0098
5315-01-157-7556INTERCHANGEABLE
PIN
11498
4320-01-205-1109INTERCHANGEABLE
RING,WEARING
3040-01-220-9945INTERCHANGEABLE
SHAFT,SHOULDERED
11498

Frequently Asked Questions

What is NSN 5310-01-125-1229?

NSN 5310-01-125-1229 is a Washer,lock, manufactured by Federal Specifications Promulgated by General Services Administration Washington DC, classified under FSC 5310 (No Item Name Available). Status: active.

What are the part numbers for NSN 5310-01-125-1229?

NSN 5310-01-125-1229 has 4 cross-referenced part numbers: FF-W-84 (Federal Specifications Promulgated by General Services Administration Washington DC), MS51848-53 (Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M), MS51848E-53 (Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M), 11498 (Worcester Controls Corp P O Box 2609 Cookeville Tn 385022609).

What NSN replaces 5310-01-125-1229?

There are 7 known substitutes for 5310-01-125-1229: 2925-00-144-3192, 5995-00-324-9267, 3120-00-447-3554 and 4 more. Verify interchangeability with system specifications before substitution.

What are the specifications of FF-W-84?

Key specifications for FF-W-84: Material Thickness: 0.140 INCHES MINIMUM IN; Hardness Rating: 35.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Style Designator: SPLIT HELICAL-RIGHT HAND. 10 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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