PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

504012Guide,valve

Transdigm Inc Div Aero Fluid Products · NSN 1660-00-186-0274 · FSC 1660 · No Item Name Available
Verified by PartsTable
NSN 1660-00-186-0274 — this item is cataloged by the U.S. Government under National Stock Number 1660-00-186-0274. Primary manufacturer part number: 504012.
Features
  • Guide,valve — FSC 1660
  • General Characteristics Item Description: CRES,PASSIVATED,0.500 IN. OD,0.420 IN. LG,USED ON 515000-1 REGULATOR IN
  • 4 verified cross-references
  • Primary manufacturer: Transdigm Inc Div Aero Fluid Products
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
General Description

The Guide,valve, cataloged under National Stock Number 1660-00-186-0274, is classified within Federal Supply Class 1660 (No Item Name Available) of the Aircraft Components and Accessories group. The primary manufacturer of record is Transdigm Inc Div Aero Fluid Products. Government technical data includes 1 verified specification, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 4 manufacturers, enabling identification through both NSN and commercial part number lookups. 4 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN1660-00-186-0274
Primary Part Number504012
Item NameGuide,valve
FSC / FSG1660 / 16 — No Item Name Available
ManufacturerTransdigm Inc Div Aero Fluid Products
StatusACTIVE
General Characteristics Item DescriptionCRES,PASSIVATED,0.500 IN. OD,0.420 IN. LG,USED ON 515000-1 REGULATOR IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 4
4730-00-279-0985 INTERCHANGEABLE
Plug,pipe
5935-00-411-3652BJ72 INTERCHANGEABLE
Connector,receptacle,electrical
Trompeter Electronics, Inc.
6680-00-651-7999504012 INTERCHANGEABLE
Repair Kit,major Ov
Simmonds Precision Products Inc
2530-01-541-05875040-12 INTERCHANGEABLE
Valve,brake Pneumatic
Heil Trailer International Llc
Cross-Reference Index
Part NumberManufacturer
504012 Szczypski, Michael (USA)
504012 Thomas Instrument, Incorporated (USA)
504012 United Dynamics, Inc (USA)
504012 PRIMARY Transdigm Inc Div Aero Fluid Products (USA)
Related Parts
4730-00-279-0985INTERCHANGEABLE
PLUG,PIPE
5935-00-411-3652INTERCHANGEABLE
CONNECTOR,RECEPTACLE,ELECTRICAL
BJ72
6680-00-651-7999INTERCHANGEABLE
REPAIR KIT,MAJOR OV
504012
2530-01-541-0587INTERCHANGEABLE
VALVE,BRAKE PNEUMATIC
5040-12

Frequently Asked Questions

What is NSN 1660-00-186-0274?

NSN 1660-00-186-0274 is a Guide,valve, manufactured by Transdigm Inc Div Aero Fluid Products, classified under FSC 1660 (No Item Name Available). Status: active.

What are the part numbers for NSN 1660-00-186-0274?

NSN 1660-00-186-0274 has 4 cross-referenced part numbers: 504012 (Szczypski, Michael), 504012 (Thomas Instrument, Incorporated), 504012 (United Dynamics, Inc), 504012 (Transdigm Inc Div Aero Fluid Products).

What NSN replaces 1660-00-186-0274?

There are 4 known substitutes for 1660-00-186-0274: 4730-00-279-0985, 5935-00-411-3652, 6680-00-651-7999 and 1 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 504012?

Key specifications for 504012: General Characteristics Item Description: CRES,PASSIVATED,0.500 IN. OD,0.420 IN. LG,USED ON 515000-1 REGULATOR IN. 1 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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