PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

20C30Valve,safety Releas

Grimes Aerospace Company · NSN 1660-00-509-4435 · FSC 1660 · No Item Name Available
Verified by PartsTable
NSN 1660-00-509-4435 — this item is cataloged by the U.S. Government under National Stock Number 1660-00-509-4435. Primary manufacturer part number: 20C30.
Features
  • Valve,safety Releas — FSC 1660
  • 5 verified cross-references
  • Primary manufacturer: Grimes Aerospace Company
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
General Description

The Valve,safety Releas, cataloged under National Stock Number 1660-00-509-4435, is classified within Federal Supply Class 1660 (No Item Name Available) of the Aircraft Components and Accessories group. The primary manufacturer of record is Grimes Aerospace Company. This item has 5 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 6 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Catalog Facts
Item NameValve,safety Releas
FSC / FSG1660 — No Item Name Available (FSG 16)
ManufacturersGrimes Aerospace Company (CAGE 72914); Surface Combustion Inc (CAGE 58588); Weldon Tool Co the (CAGE 64560)
Technical Specifications
ParameterValue
NSN1660-00-509-4435
Primary Part Number20C30
Item NameValve,safety Releas
FSC / FSG1660 / 16 — No Item Name Available
ManufacturerGrimes Aerospace Company
StatusCANCELLED
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 6
5325-00-282-6970 INTERCHANGEABLE
Ring,retaining
5950-00-400-4570 INTERCHANGEABLE
Transformer,power
2940-00-541-3499376376R92 INTERCHANGEABLE
Filter Element,fluid
Dressta North America Ltd
2805-00-962-8523235P INTERCHANGEABLE
Piston,internal Combustion Engin
Federal-Mogul Corp Government Sales Dept
5360-01-239-0597 INTERCHANGEABLE
Spring,helical,compression
4820-01-730-0104148633 INTERCHANGEABLE
Indicator,valve Opening
Mueller Co
Cross-Reference Index
Part NumberManufacturer
20C30 PRIMARY Grimes Aerospace Company (USA)
20C30 Surface Combustion Inc (USA)
P309-12 Weldon Tool Co the (USA)
P309 Weldon Tool Co the (USA)
20030 Surface Combustion Inc (USA)
Related Parts
5325-00-282-6970INTERCHANGEABLE
RING,RETAINING
5950-00-400-4570INTERCHANGEABLE
TRANSFORMER,POWER
2940-00-541-3499INTERCHANGEABLE
FILTER ELEMENT,FLUID
376376R92
2805-00-962-8523INTERCHANGEABLE
PISTON,INTERNAL COMBUSTION ENGIN
235P
5360-01-239-0597INTERCHANGEABLE
SPRING,HELICAL,COMPRESSION
4820-01-730-0104INTERCHANGEABLE
INDICATOR,VALVE OPENING
148633

Frequently Asked Questions

What is NSN 1660-00-509-4435?

NSN 1660-00-509-4435 is a Valve,safety Releas, manufactured by Grimes Aerospace Company, classified under FSC 1660 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 1660-00-509-4435?

NSN 1660-00-509-4435 has 5 cross-referenced part numbers: 20C30 (Grimes Aerospace Company), 20C30 (Surface Combustion Inc), P309-12 (Weldon Tool Co the), P309 (Weldon Tool Co the), 20030 (Surface Combustion Inc).

What NSN replaces 1660-00-509-4435?

There are 6 known substitutes for 1660-00-509-4435: 5325-00-282-6970, 5950-00-400-4570, 2940-00-541-3499 and 3 more. Verify interchangeability with system specifications before substitution.

Is NSN 1660-00-509-4435 still in active supply?

NSN 1660-00-509-4435 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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