PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

R437Washer,flat

Curtis-Toledo, Inc. · NSN 5310-00-193-9715 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-00-193-9715 — this item is cataloged by the U.S. Government under National Stock Number 5310-00-193-9715. Primary manufacturer part number: R437.
Features
  • Washer,flat — FSC 5310
  • Material Document and Classification: QQ-C-501 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
  • Material: COPPER ALLOY OVERALL
  • Cross-Sectional Shape Style: RECTANGULAR
  • Overall Diameter: 0.437 INCHES NOMINAL IN
  • Hole Diameter: 0.265 INCHES NOMINAL IN
  • Peripheral Shape Style: ROUND
  • Thickness: 0.0320 INCHES NOMINAL IN
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Copper Alloy Overall construction
General Description

The Washer,flat, cataloged under National Stock Number 5310-00-193-9715, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Curtis-Toledo, Inc.. Government technical data includes 8 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 7 commercial cross-references from 6 manufacturers, enabling identification through both NSN and commercial part number lookups. 8 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5310-00-193-9715
Primary Part NumberR437
Item NameWasher,flat
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerCurtis-Toledo, Inc.
StatusCANCELLED
Material Document and ClassificationQQ-C-501 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
MaterialCOPPER ALLOY OVERALL
Cross-Sectional Shape StyleRECTANGULAR
Overall Diameter0.437 INCHES NOMINAL IN
Hole Diameter0.265 INCHES NOMINAL IN
Peripheral Shape StyleROUND
Thickness0.0320 INCHES NOMINAL IN
Center Hole Shape StyleROUND
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 8
6850-00-155-644476759 INTERCHANGEABLE
Chemical Antigalling Cmpd
Loctite Corp
5310-00-193-9742GKT594 INTERCHANGEABLE
Washer,flat
Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions
5310-00-193-97535226029 INTERCHANGEABLE
Washer,flat
Detroit Electric Motor Works Inc
5305-00-984-4981MS35206-224 INTERCHANGEABLE
Screw,machine
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
6125-01-082-550519040 INTERCHANGEABLE
Motor-Generator
Kurz & Root Generator Company, Llc
5985-01-645-7954 INTERCHANGEABLE
Heater,antenna
4730-01-663-7067P40STJJD INTERCHANGEABLE
Tee,pipe
Charlotte Pipe and Foundry Co
5310-01-721-7514752-8840872-43 INTERCHANGEABLE
Washer,flat
Naval Sea Systems Command
Cross-Reference Index
Part NumberManufacturer
KC9125 Diamond Reo Truck Co (USA)
R437 PRIMARY Curtis-Toledo, Inc. (USA)
FF-W-92 TYA Federal Specifications Promulgated by General Services Administration Washington DC (USA)
528B1 Diamond Reo Truck Co (USA)
19040 PRIMARY Dana Automotive Systems Group, Llc Dba Dana Sealing Products (USA)
299491PC4 PRIMARY Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA)
5169866C0RK Zf Industrieantriebe Witten Gmbh (DEU)
Related Parts
6850-00-155-6444INTERCHANGEABLE
CHEMICAL ANTIGALLING CMPD
76759
5310-00-193-9742INTERCHANGEABLE
WASHER,FLAT
GKT594
5310-00-193-9753INTERCHANGEABLE
WASHER,FLAT
5226029
5305-00-984-4981INTERCHANGEABLE
SCREW,MACHINE
MS35206-224
6125-01-082-5505INTERCHANGEABLE
MOTOR-GENERATOR
19040
5985-01-645-7954INTERCHANGEABLE
HEATER,ANTENNA
4730-01-663-7067INTERCHANGEABLE
TEE,PIPE
P40STJJD
5310-01-721-7514INTERCHANGEABLE
WASHER,FLAT
752-8840872-43

Frequently Asked Questions

What is NSN 5310-00-193-9715?

NSN 5310-00-193-9715 is a Washer,flat, manufactured by Curtis-Toledo, Inc., classified under FSC 5310 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5310-00-193-9715?

NSN 5310-00-193-9715 has 7 cross-referenced part numbers: KC9125 (Diamond Reo Truck Co), R437 (Curtis-Toledo, Inc.), FF-W-92 TYA (Federal Specifications Promulgated by General Services Administration Washington DC), 528B1 (Diamond Reo Truck Co), 19040 (Dana Automotive Systems Group, Llc Dba Dana Sealing Products) and 2 more.

What NSN replaces 5310-00-193-9715?

There are 8 known substitutes for 5310-00-193-9715: 6850-00-155-6444, 5310-00-193-9742, 5310-00-193-9753 and 5 more. Verify interchangeability with system specifications before substitution.

What are the specifications of R437?

Key specifications for R437: Material Document and Classification: QQ-C-501 FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Material: COPPER ALLOY OVERALL; Cross-Sectional Shape Style: RECTANGULAR; Overall Diameter: 0.437 INCHES NOMINAL IN. 8 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5310-00-193-9715 still in active supply?

NSN 5310-00-193-9715 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

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