PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

2531-1Reference Standard,physical Prop

Earle Environmental Corp · NSN 6635-01-604-2608 · FSC 6635 · No Item Name Available
Verified by PartsTable
NSN 6635-01-604-2608 — this item is cataloged by the U.S. Government under National Stock Number 6635-01-604-2608. Primary manufacturer part number: 2531-1.
Features
  • Reference Standard,physical Prop — FSC 6635
  • 2 verified cross-references
  • Primary manufacturer: Earle Environmental Corp
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Reference Standard,physical Prop, cataloged under National Stock Number 6635-01-604-2608, is classified within Federal Supply Class 6635 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Earle Environmental Corp. This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 3 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN6635-01-604-2608
Primary Part Number2531-1
Item NameReference Standard,physical Prop
FSC / FSG6635 / 66 — No Item Name Available
ManufacturerEarle Environmental Corp
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 3
5950-00-902-7111666230-023 INTERCHANGEABLE
Transformer,radio Frequency
Bae Systems Information and Electronic Systems Integration Inc. Div Bae Systems Information & Electronic Systems Integration Inc
5325-01-211-054225311 INTERCHANGEABLE
Ring,retaining
Twg Canada Consolidated Inc
3010-01-368-7429253-11 INTERCHANGEABLE
Disk,clutch,nonvehicular
Wichita Clutch Co Inc Sub of Dana Corp
Cross-Reference Index
Part NumberManufacturer
3673310M01042-1 Northrop Grumman Systems Corporation (USA)
2531-1 PRIMARY Earle Environmental Corp (USA)
Related Parts
5950-00-902-7111INTERCHANGEABLE
TRANSFORMER,RADIO FREQUENCY
666230-023
5325-01-211-0542INTERCHANGEABLE
RING,RETAINING
25311
3010-01-368-7429INTERCHANGEABLE
DISK,CLUTCH,NONVEHICULAR
253-11

Frequently Asked Questions

What is NSN 6635-01-604-2608?

NSN 6635-01-604-2608 is a Reference Standard,physical Prop, manufactured by Earle Environmental Corp, classified under FSC 6635 (No Item Name Available). Status: active.

What are the part numbers for NSN 6635-01-604-2608?

NSN 6635-01-604-2608 has 2 cross-referenced part numbers: 3673310M01042-1 (Northrop Grumman Systems Corporation), 2531-1 (Earle Environmental Corp).

What NSN replaces 6635-01-604-2608?

There are 3 known substitutes for 6635-01-604-2608: 5950-00-902-7111, 5325-01-211-0542, 3010-01-368-7429. Verify interchangeability with system specifications before substitution.

What are the specifications of 2531-1?

Key specifications for 2531-1: Part Name Assigned by Controlling Agency: REFERENCE STANDARD; End Item Identification: RQ-4A A. 2 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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