PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

99121Reference Standard,physical Prop

United Western Technologies Corp. · NSN 6635-01-561-0159 · FSC 6635 · No Item Name Available
Verified by PartsTable
NSN 6635-01-561-0159 — this item is cataloged by the U.S. Government under National Stock Number 6635-01-561-0159. Primary manufacturer part number: 99121.
Features
  • Reference Standard,physical Prop — FSC 6635
  • 1 verified cross-reference
  • Primary manufacturer: United Western Technologies 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 6635-01-561-0159, is classified within Federal Supply Class 6635 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is United Western Technologies Corp.. This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 5 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN6635-01-561-0159
Primary Part Number99121
Item NameReference Standard,physical Prop
FSC / FSG6635 / 66 — No Item Name Available
ManufacturerUnited Western Technologies Corp.
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 5
5310-00-785-103699121 INTERCHANGEABLE
Washer,flat
Westinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp
4720-01-389-771799121 INTERCHANGEABLE
Hose Assembly,nonmetallic
Stewart & Stevenson Power Products Llc
5305-01-484-462399121 INTERCHANGEABLE
Screw,machine
Independent Rough Terrain Center Llc
6550-01-492-703699121 INTERCHANGEABLE
Glucose Test Reagent
Abbott Laboratories Inc. Dba Abbott Nutrition Div Abbott Diagnostics Division
5995-01-668-37069912-1 INTERCHANGEABLE
Wiring Harness,branched
Tru-Hitch, Inc.
Cross-Reference Index
Part NumberManufacturer
99121 PRIMARY United Western Technologies Corp. (USA)
Related Parts
5310-00-785-1036INTERCHANGEABLE
WASHER,FLAT
99121
4720-01-389-7717INTERCHANGEABLE
HOSE ASSEMBLY,NONMETALLIC
99121
5305-01-484-4623INTERCHANGEABLE
SCREW,MACHINE
99121
6550-01-492-7036INTERCHANGEABLE
GLUCOSE TEST REAGENT
99121
5995-01-668-3706INTERCHANGEABLE
WIRING HARNESS,BRANCHED
9912-1

Frequently Asked Questions

What is NSN 6635-01-561-0159?

NSN 6635-01-561-0159 is a Reference Standard,physical Prop, manufactured by United Western Technologies Corp., classified under FSC 6635 (No Item Name Available). Status: active.

What are the part numbers for NSN 6635-01-561-0159?

NSN 6635-01-561-0159 has 1 cross-referenced part number: 99121 (United Western Technologies Corp.).

What NSN replaces 6635-01-561-0159?

There are 5 known substitutes for 6635-01-561-0159: 5310-00-785-1036, 4720-01-389-7717, 5305-01-484-4623 and 2 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 99121?

Key specifications for 99121: End Item Identification: F-22 AIRCRAFT ENGINE THRUST MOUNT KIT 6635-01-560-8721; Part Name Assigned by Controlling Agency: REFERENCE STANDARD, AIRFRAME SIDE. 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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