PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

9256Heating Unit

Onyx Spectrum Technology Inc Dba Onyx Spectrum Technology · NSN 4540-01-348-3846 · FSC 4540 · No Item Name Available
Verified by PartsTable
NSN 4540-01-348-3846 — this item is cataloged by the U.S. Government under National Stock Number 4540-01-348-3846. Primary manufacturer part number: 9256.
Features
  • Heating Unit — FSC 4540
  • General Characteristics Item Description: MOLDED HEATER ASSEMBLY USED IN PYROMETER TEST STAND; WRAPS AROUND PYROMETER DURING TESTING IN THE ENVIRONMENT CHAMBER; KEEPS MOISTURE FROM COLLECTING ON LENS OF PYROMETER
  • 2 verified cross-references
  • Primary manufacturer: Onyx Spectrum Technology Inc Dba Onyx Spectrum Technology
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Heating Unit, cataloged under National Stock Number 4540-01-348-3846, is classified within Federal Supply Class 4540 (No Item Name Available) of the Plumbing, Heating, and Waste Disposal group. The primary manufacturer of record is Onyx Spectrum Technology Inc Dba Onyx Spectrum Technology. Government technical data includes 1 verified specification, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 2 manufacturers, 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
NSN4540-01-348-3846
Primary Part Number9256
Item NameHeating Unit
FSC / FSG4540 / 45 — No Item Name Available
ManufacturerOnyx Spectrum Technology Inc Dba Onyx Spectrum Technology
StatusACTIVE
General Characteristics Item DescriptionMOLDED HEATER ASSEMBLY USED IN PYROMETER TEST STAND; WRAPS AROUND PYROMETER DURING TESTING IN THE ENVIRONMENT CHAMBER; KEEPS MOISTURE FROM COLLECTING ON LENS OF PYROMETER
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 5
5330-00-285-9436 INTERCHANGEABLE
Seal,plain Encased
5360-00-946-0072 INTERCHANGEABLE
Spring,helical,compression
5310-01-205-2524 INTERCHANGEABLE
Washer
4730-01-213-9585STBC10GG-128 INTERCHANGEABLE
Clamp,hose
The Boeing Company Div Defense
5331-01-284-7891 INTERCHANGEABLE
O-Ring
Cross-Reference Index
Part NumberManufacturer
9256 Electro Optical Industries Inc (USA)
9256 PRIMARY Onyx Spectrum Technology Inc Dba Onyx Spectrum Technology (USA)
Related Parts
5330-00-285-9436INTERCHANGEABLE
SEAL,PLAIN ENCASED
5360-00-946-0072INTERCHANGEABLE
SPRING,HELICAL,COMPRESSION
5310-01-205-2524INTERCHANGEABLE
WASHER
4730-01-213-9585INTERCHANGEABLE
CLAMP,HOSE
STBC10GG-128
5331-01-284-7891INTERCHANGEABLE
O-RING

Frequently Asked Questions

What is NSN 4540-01-348-3846?

NSN 4540-01-348-3846 is a Heating Unit, manufactured by Onyx Spectrum Technology Inc Dba Onyx Spectrum Technology, classified under FSC 4540 (No Item Name Available). Status: active.

What are the part numbers for NSN 4540-01-348-3846?

NSN 4540-01-348-3846 has 2 cross-referenced part numbers: 9256 (Electro Optical Industries Inc), 9256 (Onyx Spectrum Technology Inc Dba Onyx Spectrum Technology).

What NSN replaces 4540-01-348-3846?

There are 5 known substitutes for 4540-01-348-3846: 5330-00-285-9436, 5360-00-946-0072, 5310-01-205-2524 and 2 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 9256?

Key specifications for 9256: General Characteristics Item Description: MOLDED HEATER ASSEMBLY USED IN PYROMETER TEST STAND; WRAPS AROUND PYROMETER DURING TESTING IN THE ENVIRONMENT CHAMBER; KEEPS MOISTURE FROM COLLECTING ON LENS OF PYROMETER. 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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