PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

6539Disk,valve

Lawler Manufacturing Company, Inc. · NSN 4820-01-038-8070 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-038-8070 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-038-8070. Primary manufacturer part number: 6539.
Features
  • Disk,valve — FSC 4820
  • Material: RUBBER SYNTHETIC
  • Outside Diameter: 3.195 INCHES NOMINAL IN
  • Style Designator: PLAIN
  • Inside Diameter: 2.000 INCHES NOMINAL IN
  • 2 verified cross-references
  • Primary manufacturer: Lawler Manufacturing Company, Inc.
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
  • Applications requiring Rubber Synthetic construction
General Description

The Disk,valve, cataloged under National Stock Number 4820-01-038-8070, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Lawler Manufacturing Company, Inc.. Government technical data includes 4 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 1 manufacturer, 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
NSN4820-01-038-8070
Primary Part Number6539
Item NameDisk,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerLawler Manufacturing Company, Inc.
StatusACTIVE
MaterialRUBBER SYNTHETIC
Outside Diameter3.195 INCHES NOMINAL IN
Style DesignatorPLAIN
Inside Diameter2.000 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5305-00-010-0759100759 INTERCHANGEABLE
Screw,machine
Chrysler Realty Company Llc Dba Daimler Chrysler
5935-00-067-5516ST5M1359 INTERCHANGEABLE
Adapter,connector
The Boeing Company Div Defense
5340-00-236-2494 INTERCHANGEABLE
Strap,retaining
3030-00-528-4261 INTERCHANGEABLE
Belt,v
5355-00-614-0400MS91531-3N2B INTERCHANGEABLE
Knob
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5930-01-083-90586539 INTERCHANGEABLE
Switch,limit
Auto Crane Company
5310-01-251-9178340P INTERCHANGEABLE
Nut,slide Tube
O F Mossberg & Sons Inc
5962-01-289-525051065-0039 INTERCHANGEABLE
Microcircuit,digital
Honeywell International Inc Dba Honeywell
5136-01-431-16216539 INTERCHANGEABLE
Die,thread Cutting
Stanley Tools Div of Stanley Works
6625-01-433-0346YMD-6821 INTERCHANGEABLE
Counter,electronic,digital Reado
Appleton Marine Inc
Cross-Reference Index
Part NumberManufacturer
71996PC26 Lawler Manufacturing Company, Inc. (USA)
6539 PRIMARY Lawler Manufacturing Company, Inc. (USA)
Related Parts
5305-00-010-0759INTERCHANGEABLE
SCREW,MACHINE
100759
5935-00-067-5516INTERCHANGEABLE
ADAPTER,CONNECTOR
ST5M1359
5340-00-236-2494INTERCHANGEABLE
STRAP,RETAINING
3030-00-528-4261INTERCHANGEABLE
BELT,V
5355-00-614-0400INTERCHANGEABLE
KNOB
MS91531-3N2B
5930-01-083-9058INTERCHANGEABLE
SWITCH,LIMIT
6539
5310-01-251-9178INTERCHANGEABLE
NUT,SLIDE TUBE
340P
5962-01-289-5250INTERCHANGEABLE
MICROCIRCUIT,DIGITAL
51065-0039
5136-01-431-1621INTERCHANGEABLE
DIE,THREAD CUTTING
6539
6625-01-433-0346INTERCHANGEABLE
COUNTER,ELECTRONIC,DIGITAL READO
YMD-6821
6515-01-561-6226INTERCHANGEABLE
CABLE,MOTOR,SURGICAL DRILL
EA200
5180-01-661-7426INTERCHANGEABLE
TOOL KIT,VEHICLE,TACTICAL
6539

Frequently Asked Questions

What is NSN 4820-01-038-8070?

NSN 4820-01-038-8070 is a Disk,valve, manufactured by Lawler Manufacturing Company, Inc., classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-038-8070?

NSN 4820-01-038-8070 has 2 cross-referenced part numbers: 71996PC26 (Lawler Manufacturing Company, Inc.), 6539 (Lawler Manufacturing Company, Inc.).

What NSN replaces 4820-01-038-8070?

There are 12 known substitutes for 4820-01-038-8070: 5305-00-010-0759, 5935-00-067-5516, 5340-00-236-2494 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 6539?

Key specifications for 6539: Overall Height: 0.500 INCHES NOMINAL IN; Material: RUBBER SYNTHETIC; Special Features: INSERT TYPE,3-3/16 IN. OD DIA,2 IN. ID DIA,15/32 IN. HEIGHT IN; Outside Diameter: 3.195 INCHES NOMINAL IN. 6 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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