PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

U8-4-25Cutter,milling,commutator Mica

Rjk Corp · NSN 4940-00-278-9808 · FSC 4940 · No Item Name Available
Verified by PartsTable
NSN 4940-00-278-9808 — this item is cataloged by the U.S. Government under National Stock Number 4940-00-278-9808. Primary manufacturer part number: U8-4-25.
Features
  • Cutter,milling,commutator Mica — FSC 4940
  • Thickness: 0.025 INCHES NOMINAL IN
  • Material: STEEL
  • Outside Diameter: 0.250 INCHES NOMINAL IN
  • Mounting Hole Diameter: 0.125 INCHES NOMINAL IN
  • Cut Shape: U-SLOT
  • 3 verified cross-references
  • Primary manufacturer: Rjk Corp
Applications
  • Applications requiring Steel construction
General Description

The Cutter,milling,commutator Mica, cataloged under National Stock Number 4940-00-278-9808, is classified within Federal Supply Class 4940 (No Item Name Available) of the Maintenance and Repair Shop Equipment group. The primary manufacturer of record is Rjk Corp. Government technical data includes 5 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 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
NSN4940-00-278-9808
Primary Part NumberU8-4-25
Item NameCutter,milling,commutator Mica
FSC / FSG4940 / 49 — No Item Name Available
ManufacturerRjk Corp
StatusACTIVE
Thickness0.025 INCHES NOMINAL IN
MaterialSTEEL
Outside Diameter0.250 INCHES NOMINAL IN
Mounting Hole Diameter0.125 INCHES NOMINAL IN
Cut ShapeU-SLOT
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
4940-00-204-0319 INTERCHANGEABLE
Undercutter,armature Mica,electr
4940-00-270-159410T INTERCHANGEABLE
Undercutter,armature Mica,electr
Rjk Corp
4940-00-273-370426-153 INTERCHANGEABLE
Cutter,milling,commutator Mica
Ideal Industries, Inc.
4940-00-273-370526-155 INTERCHANGEABLE
Cutter,milling,commutator Mica
Ideal Industries, Inc.
4940-00-287-321726-501 INTERCHANGEABLE
Cutter,milling,commutator Mica
Ideal Industries, Inc.
4940-00-287-321826-503 INTERCHANGEABLE
Cutter,milling,commutator Mica
Ideal Industries, Inc.
4940-00-287-321926-502 INTERCHANGEABLE
Cutter,milling,commutator Mica
Ideal Industries, Inc.
4940-00-287-322126-504 INTERCHANGEABLE
Cutter,milling,commutator Mica
Ideal Industries, Inc.
4940-00-287-322226-507 INTERCHANGEABLE
Cutter,milling,commutator Mica
Ideal Industries, Inc.
4940-00-287-322326-506 INTERCHANGEABLE
Cutter,milling,commutator Mica
Ideal Industries, Inc.
Cross-Reference Index
Part NumberManufacturer
MIL-U-17148 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
U8-4-25 PRIMARY Rjk Corp (USA)
26-055 PRIMARY Ideal Industries, Inc. (USA)
Related Parts
4940-00-204-0319INTERCHANGEABLE
UNDERCUTTER,ARMATURE MICA,ELECTR
4940-00-270-1594INTERCHANGEABLE
UNDERCUTTER,ARMATURE MICA,ELECTR
10T
4940-00-273-3704INTERCHANGEABLE
CUTTER,MILLING,COMMUTATOR MICA
26-153
4940-00-273-3705INTERCHANGEABLE
CUTTER,MILLING,COMMUTATOR MICA
26-155
4940-00-287-3217INTERCHANGEABLE
CUTTER,MILLING,COMMUTATOR MICA
26-501
4940-00-287-3218INTERCHANGEABLE
CUTTER,MILLING,COMMUTATOR MICA
26-503
4940-00-287-3219INTERCHANGEABLE
CUTTER,MILLING,COMMUTATOR MICA
26-502
4940-00-287-3221INTERCHANGEABLE
CUTTER,MILLING,COMMUTATOR MICA
26-504
4940-00-287-3222INTERCHANGEABLE
CUTTER,MILLING,COMMUTATOR MICA
26-507
4940-00-287-3223INTERCHANGEABLE
CUTTER,MILLING,COMMUTATOR MICA
26-506
4940-00-287-3224INTERCHANGEABLE
CUTTER,MILLING,COMMUTATOR MICA
26-509
4940-00-287-3225INTERCHANGEABLE
CUTTER,MILLING,COMMUTATOR MICA
26-508

Frequently Asked Questions

What is NSN 4940-00-278-9808?

NSN 4940-00-278-9808 is a Cutter,milling,commutator Mica, manufactured by Rjk Corp, classified under FSC 4940 (No Item Name Available). Status: active.

What are the part numbers for NSN 4940-00-278-9808?

NSN 4940-00-278-9808 has 3 cross-referenced part numbers: MIL-U-17148 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), U8-4-25 (Rjk Corp), 26-055 (Ideal Industries, Inc.).

What NSN replaces 4940-00-278-9808?

There are 12 known substitutes for 4940-00-278-9808: 4940-00-204-0319, 4940-00-270-1594, 4940-00-273-3704 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of U8-4-25?

Key specifications for U8-4-25: Thickness: 0.025 INCHES NOMINAL IN; Material: STEEL; Outside Diameter: 0.250 INCHES NOMINAL IN; Mounting Hole Diameter: 0.125 INCHES NOMINAL IN. 5 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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