PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

503-0-300Pyrometer,indicating

Lfe Instruments a Mark IV Co · NSN 6685-00-883-3731 · FSC 6685 · No Item Name Available
Verified by PartsTable
NSN 6685-00-883-3731 — this item is cataloged by the U.S. Government under National Stock Number 6685-00-883-3731. Primary manufacturer part number: 503-0-300.
Features
  • Pyrometer,indicating — FSC 6685
  • Pointer/pen Type and Quantity: 1 INDICATING SINGLE
  • Scale Type: ECCENTRIC
  • 5 verified cross-references
  • Primary manufacturer: Lfe Instruments a Mark IV Co
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Pyrometer,indicating, cataloged under National Stock Number 6685-00-883-3731, is classified within Federal Supply Class 6685 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Lfe Instruments a Mark IV Co. Government technical data includes 2 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 5 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN6685-00-883-3731
Primary Part Number503-0-300
Item NamePyrometer,indicating
FSC / FSG6685 / 66 — No Item Name Available
ManufacturerLfe Instruments a Mark IV Co
StatusACTIVE
Pointer/pen Type and Quantity1 INDICATING SINGLE
Scale TypeECCENTRIC
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5310-00-012-0377 INTERCHANGEABLE
Nut,plain,hexagon
3110-00-198-05525518695 INTERCHANGEABLE
Bearing,ball,annular
Skf Usa Inc.
5120-00-595-827421202 INTERCHANGEABLE
Clamp,c
Wilton Corp Wilton Tool Div
5310-00-732-0558 INTERCHANGEABLE
Nut,plain,hexagon
1610-00-790-8080 INTERCHANGEABLE
Nut,propellar Hub
4710-00-934-1088500906-1 INTERCHANGEABLE
Tube,bent,metallic
Raytheon Company Dba Raytheon
3010-01-095-4357 INTERCHANGEABLE
Cap Actuator
5950-01-171-1604 INTERCHANGEABLE
Transformer
4320-01-184-749021202 INTERCHANGEABLE
Shaft Bearing
Parker Hannifin Corporation Div Hydraulic Systems Division
6220-01-247-36115009061 INTERCHANGEABLE
Light,marker,clearance
Elgin Sweeper Company
Cross-Reference Index
Part NumberManufacturer
503-0-300 Lfe Instruments a Mark IV Co (USA)
503IC0-300F Lfe Instruments a Mark IV Co (USA)
500906-1 Brooks Automation, Inc. Div Cti Cryogenics (USA)
21202 Simpson Electric Company, Inc. (USA)
491-257 Lfe Instruments a Mark IV Co (USA)
Related Parts
5310-00-012-0377INTERCHANGEABLE
NUT,PLAIN,HEXAGON
3110-00-198-0552INTERCHANGEABLE
BEARING,BALL,ANNULAR
5518695
5120-00-595-8274INTERCHANGEABLE
CLAMP,C
21202
5310-00-732-0558INTERCHANGEABLE
NUT,PLAIN,HEXAGON
1610-00-790-8080INTERCHANGEABLE
NUT,PROPELLAR HUB
4710-00-934-1088INTERCHANGEABLE
TUBE,BENT,METALLIC
500906-1
3010-01-095-4357INTERCHANGEABLE
CAP ACTUATOR
5950-01-171-1604INTERCHANGEABLE
TRANSFORMER
4320-01-184-7490INTERCHANGEABLE
SHAFT BEARING
21202
6220-01-247-3611INTERCHANGEABLE
LIGHT,MARKER,CLEARANCE
5009061
3130-01-274-0424INTERCHANGEABLE
HOUSING,BEARING UNIT
3040-01-414-4104INTERCHANGEABLE
ROD,PISTON,LINEAR ACTUATING CYLI
21202-1000-1

Frequently Asked Questions

What is NSN 6685-00-883-3731?

NSN 6685-00-883-3731 is a Pyrometer,indicating, manufactured by Lfe Instruments a Mark IV Co, classified under FSC 6685 (No Item Name Available). Status: active.

What are the part numbers for NSN 6685-00-883-3731?

NSN 6685-00-883-3731 has 5 cross-referenced part numbers: 503-0-300 (Lfe Instruments a Mark IV Co), 503IC0-300F (Lfe Instruments a Mark IV Co), 500906-1 (Brooks Automation, Inc. Div Cti Cryogenics), 21202 (Simpson Electric Company, Inc.), 491-257 (Lfe Instruments a Mark IV Co).

What NSN replaces 6685-00-883-3731?

There are 12 known substitutes for 6685-00-883-3731: 5310-00-012-0377, 3110-00-198-0552, 5120-00-595-8274 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 503-0-300?

Key specifications for 503-0-300: Pointer/pen Type and Quantity: 1 INDICATING SINGLE; Scale Type: ECCENTRIC. 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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