PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

56040Wrench,relay Contac

General Dynamics Mission Systems, Inc. · NSN 5120-00-181-6878 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-00-181-6878 — this item is cataloged by the U.S. Government under National Stock Number 5120-00-181-6878. Primary manufacturer part number: 56040.
Features
  • Wrench,relay Contac — FSC 5120
  • 5 verified cross-references
  • Primary manufacturer: General Dynamics Mission Systems, Inc.
Applications
  • Circuit control and protection
  • Equipment power management
  • Signal routing
General Description

The Wrench,relay Contac, cataloged under National Stock Number 5120-00-181-6878, is classified within Federal Supply Class 5120 (No Item Name Available) of the Hand Tools group. The primary manufacturer of record is General Dynamics Mission Systems, Inc.. This item has 5 commercial cross-references from 5 manufacturers, enabling identification through both NSN and commercial part number lookups. 3 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Catalog Facts
Item NameWrench,relay Contac
FSC / FSG5120 — No Item Name Available (FSG 51)
ManufacturersAmerican Telephone and Telegraph Co (CAGE 64959); Lucent Technologies Inc Corporate Headquarters (CAGE 3B4M0); General Dynamics Mission Systems, Inc. (CAGE 04655); Lucent Technologies Inc Dba Federal Marketing Group (CAGE 06KW9); At and T Corp (CAGE 70408)
Technical Specifications
ParameterValue
NSN5120-00-181-6878
Primary Part Number56040
Item NameWrench,relay Contac
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerGeneral Dynamics Mission Systems, Inc.
StatusCANCELLED
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 3
6645-00-864-6794M3971/1-6-S INTERCHANGEABLE
Meter,time Totalizing
Maxima Technologies & Systems Llc
3020-00-961-6160GD103-1 INTERCHANGEABLE
Gear,helical
Wisconsin Motors, Llc
4720-01-511-861356040 INTERCHANGEABLE
Hose,preformed
Goodyear Tire and Rubber Co the
Cross-Reference Index
Part NumberManufacturer
270 American Telephone and Telegraph Co (USA)
270 Lucent Technologies Inc Corporate Headquarters (USA)
56040 PRIMARY General Dynamics Mission Systems, Inc. (USA)
270 Lucent Technologies Inc Dba Federal Marketing Group (USA)
270 At and T Corp (USA)
Related Parts
6645-00-864-6794INTERCHANGEABLE
METER,TIME TOTALIZING
M3971/1-6-S
3020-00-961-6160INTERCHANGEABLE
GEAR,HELICAL
GD103-1
4720-01-511-8613INTERCHANGEABLE
HOSE,PREFORMED
56040

Frequently Asked Questions

What is NSN 5120-00-181-6878?

NSN 5120-00-181-6878 is a Wrench,relay Contac, manufactured by General Dynamics Mission Systems, Inc., classified under FSC 5120 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5120-00-181-6878?

NSN 5120-00-181-6878 has 5 cross-referenced part numbers: 270 (American Telephone and Telegraph Co), 270 (Lucent Technologies Inc Corporate Headquarters), 56040 (General Dynamics Mission Systems, Inc.), 270 (Lucent Technologies Inc Dba Federal Marketing Group), 270 (At and T Corp).

What NSN replaces 5120-00-181-6878?

There are 3 known substitutes for 5120-00-181-6878: 6645-00-864-6794, 3020-00-961-6160, 4720-01-511-8613. Verify interchangeability with system specifications before substitution.

Is NSN 5120-00-181-6878 still in active supply?

NSN 5120-00-181-6878 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

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