PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

BM2171Case,pyrometer Carr

Sterling Engine Co Inc · NSN 6685-00-399-1920 · FSC 6685 · No Item Name Available
Verified by PartsTable
NSN 6685-00-399-1920 — this item is cataloged by the U.S. Government under National Stock Number 6685-00-399-1920. Primary manufacturer part number: BM2171.
Features
  • Case,pyrometer Carr — FSC 6685
  • 2 verified cross-references
  • Primary manufacturer: Sterling Engine Co Inc
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Case,pyrometer Carr, cataloged under National Stock Number 6685-00-399-1920, is classified within Federal Supply Class 6685 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Sterling Engine Co Inc. This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Catalog Facts
Item NameCase,pyrometer Carr
FSC / FSG6685 — No Item Name Available (FSG 66)
ManufacturersSterling Engine Co Inc (CAGE 17572); Alnor Instrument Company (CAGE 01518)
Technical Specifications
ParameterValue
NSN6685-00-399-1920
Primary Part NumberBM2171
Item NameCase,pyrometer Carr
FSC / FSG6685 / 66 — No Item Name Available
ManufacturerSterling Engine Co Inc
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
4810-00-089-4449 INTERCHANGEABLE
Seat,valve
5999-00-103-043202-0101-0157-02 INTERCHANGEABLE
Shielding Gasket,electronic
Parker-Hannifin Corporation Dba Pneutronics Div Chomerics Division
2805-00-119-03241572 INTERCHANGEABLE
Ring
R.h. Industries, Inc.
2815-00-172-0669BM34437 INTERCHANGEABLE
Plate Assy,rear
Cummins Inc.
5930-00-296-5262499914PC10 INTERCHANGEABLE
Switch,rotary
Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier
6150-00-311-29781572 INTERCHANGEABLE
Wiring Harness
Stewart & Stevenson Power Products Llc
6240-00-577-33574512 INTERCHANGEABLE
Lamp,incandescent
Philips Electronics North America Corporation Dba Philips Lighting Div Philips Lighting Company
5940-00-733-779532456 INTERCHANGEABLE
Terminal,lug
Te Connectivity Corporation
4720-01-011-9278 INTERCHANGEABLE
Tubing,nonmetallic
5950-01-085-1573SM-D-703023 INTERCHANGEABLE
Reactor
Us Army Communications & Electronics Materiel Readiness Command Logistics Engineering Dir
Cross-Reference Index
Part NumberManufacturer
BM2171 PRIMARY Sterling Engine Co Inc (USA)
1572 Alnor Instrument Company (USA)
Related Parts
4810-00-089-4449INTERCHANGEABLE
SEAT,VALVE
5999-00-103-0432INTERCHANGEABLE
SHIELDING GASKET,ELECTRONIC
02-0101-0157-02
2805-00-119-0324INTERCHANGEABLE
RING
1572
2815-00-172-0669INTERCHANGEABLE
PLATE ASSY,REAR
BM34437
5930-00-296-5262INTERCHANGEABLE
SWITCH,ROTARY
499914PC10
6150-00-311-2978INTERCHANGEABLE
WIRING HARNESS
1572
6240-00-577-3357INTERCHANGEABLE
LAMP,INCANDESCENT
4512
5940-00-733-7795INTERCHANGEABLE
TERMINAL,LUG
32456
4720-01-011-9278INTERCHANGEABLE
TUBING,NONMETALLIC
5950-01-085-1573INTERCHANGEABLE
REACTOR
SM-D-703023
2530-01-167-5427INTERCHANGEABLE
CYLINDER ASSEMBLY,HYDRAULIC BRAK
3580093
5330-01-201-0265INTERCHANGEABLE
PARTS KIT,SEAL REPLACEMENT,MECHA
54336

Frequently Asked Questions

What is NSN 6685-00-399-1920?

NSN 6685-00-399-1920 is a Case,pyrometer Carr, manufactured by Sterling Engine Co Inc, classified under FSC 6685 (No Item Name Available). Status: active.

What are the part numbers for NSN 6685-00-399-1920?

NSN 6685-00-399-1920 has 2 cross-referenced part numbers: BM2171 (Sterling Engine Co Inc), 1572 (Alnor Instrument Company).

What NSN replaces 6685-00-399-1920?

There are 12 known substitutes for 6685-00-399-1920: 4810-00-089-4449, 5999-00-103-0432, 2805-00-119-0324 and 9 more. Verify interchangeability with system specifications before substitution.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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