PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

3261Washer,seal

Heyco Inc Dba Heyco Products · NSN 5310-01-587-5970 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-01-587-5970 — this item is cataloged by the U.S. Government under National Stock Number 5310-01-587-5970. Primary manufacturer part number: 3261.
Features
  • Washer,seal — FSC 5310
  • Material Document and Classification: UL94V-0 FLAME RETARDANT ASSN STD SINGLE MATERIAL RESPONSE OVERALL
  • Hole Diameter: 1.030 INCHES NOMINAL1.030 INCHES NOMINAL IN
  • Material: RUBBER SYNTHETIC AND PLASTIC OVERALL
  • Outside Diameter: 1.500 INCHES NOMINAL1.500 INCHES NOMINAL IN
  • Style Designator: CONCAVE
  • 3 verified cross-references
  • Primary manufacturer: Heyco Inc Dba Heyco Products
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Fluid containment and leak prevention
  • Pressure boundary maintenance
General Description

The Washer,seal, cataloged under National Stock Number 5310-01-587-5970, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Heyco Inc Dba Heyco Products. Government technical data includes 5 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5310-01-587-5970
Primary Part Number3261
Item NameWasher,seal
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerHeyco Inc Dba Heyco Products
StatusACTIVE
Material Document and ClassificationUL94V-0 FLAME RETARDANT ASSN STD SINGLE MATERIAL RESPONSE OVERALL
Hole Diameter1.030 INCHES NOMINAL1.030 INCHES NOMINAL IN
MaterialRUBBER SYNTHETIC AND PLASTIC OVERALL
Outside Diameter1.500 INCHES NOMINAL1.500 INCHES NOMINAL IN
Style DesignatorCONCAVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
4730-00-188-185444615K422 INTERCHANGEABLE
Nipple,pipe
Guild Associates Inc
3455-00-224-365009200 INTERCHANGEABLE
Cutter,milling,metal Slitting
Niagara Cutter Inc
4730-00-278-2523 INTERCHANGEABLE
Clamp,hose
4810-00-371-1493326-1 INTERCHANGEABLE
Valve,solenoid
L. J. Engineering Inc
5340-00-753-7521 INTERCHANGEABLE
Clip,retaining
5325-01-006-40403261 INTERCHANGEABLE
Grommet,nonmetallic
Greene Rubber Company, Inc.
5360-01-026-11083261 INTERCHANGEABLE
Spring,helical,compression
Lawler Manufacturing Company, Inc.
5999-01-106-0842712847-1 INTERCHANGEABLE
Delay Line
Raytheon Company Div Rmd Strategic
2530-01-254-4842326-1 INTERCHANGEABLE
Horn Button,vehicle
Big a Auto Parts Inc Div of Big a Jobber Corp
5345-01-327-9528326-1 INTERCHANGEABLE
Stone,cylinder Hone
Horizon Tool, Inc.
Cross-Reference Index
Part NumberManufacturer
P53508NPT United Equipment Accessories, Inc. Dba United Equipment Accessories Inc (USA)
3261 PRIMARY Heyco Inc Dba Heyco Products (USA)
RCIA180301-PB1 BALLOON # 9A United Equipment Accessories, Inc. Dba United Equipment Accessories Inc (USA)
Related Parts
4730-00-188-1854INTERCHANGEABLE
NIPPLE,PIPE
44615K422
3455-00-224-3650INTERCHANGEABLE
CUTTER,MILLING,METAL SLITTING
09200
4730-00-278-2523INTERCHANGEABLE
CLAMP,HOSE
4810-00-371-1493INTERCHANGEABLE
VALVE,SOLENOID
326-1
5340-00-753-7521INTERCHANGEABLE
CLIP,RETAINING
5325-01-006-4040INTERCHANGEABLE
GROMMET,NONMETALLIC
3261
5360-01-026-1108INTERCHANGEABLE
SPRING,HELICAL,COMPRESSION
3261
5999-01-106-0842INTERCHANGEABLE
DELAY LINE
712847-1
2530-01-254-4842INTERCHANGEABLE
HORN BUTTON,VEHICLE
326-1
5345-01-327-9528INTERCHANGEABLE
STONE,CYLINDER HONE
326-1
5120-01-430-8546INTERCHANGEABLE
WRENCH,TORQUE
5130-01-525-0929INTERCHANGEABLE
BIT,SCREWDRIVER
326-1

Frequently Asked Questions

What is NSN 5310-01-587-5970?

NSN 5310-01-587-5970 is a Washer,seal, manufactured by Heyco Inc Dba Heyco Products, classified under FSC 5310 (No Item Name Available). Status: active.

What are the part numbers for NSN 5310-01-587-5970?

NSN 5310-01-587-5970 has 3 cross-referenced part numbers: P53508NPT (United Equipment Accessories, Inc. Dba United Equipment Accessories Inc), 3261 (Heyco Inc Dba Heyco Products), RCIA180301-PB1 BALLOON # 9A (United Equipment Accessories, Inc. Dba United Equipment Accessories Inc).

What NSN replaces 5310-01-587-5970?

There are 12 known substitutes for 5310-01-587-5970: 4730-00-188-1854, 3455-00-224-3650, 4730-00-278-2523 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 3261?

Key specifications for 3261: Overall Height: 0.135 INCHES NOMINAL0.135 INCHES NOMINAL IN; Part Name Assigned by Controlling Agency: SW 3/4SW 3/4; Material Document and Classification: UL94V-0 FLAME RETARDANT ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Hole Diameter: 1.030 INCHES NOMINAL1.030 INCHES NOMINAL IN. 8 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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