PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

3857Bit,wire Wrapping Tool

A.w. Mack Manufacturing Co., Inc. · NSN 5120-00-051-3857 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-00-051-3857 — this item is cataloged by the U.S. Government under National Stock Number 5120-00-051-3857. Primary manufacturer part number: 3857.
Features
  • Bit,wire Wrapping Tool — FSC 5120
  • General Characteristics Item Description: FOR 26 AWG WIRE; MODIFIED WRAP; 0.070 IN. (1.78MM) TERMINAL HOLE DIA; 1 IN. (25.4MM) TERMINAL HOLE DEPTH MM
  • 9 verified cross-references
  • Primary manufacturer: A.w. Mack Manufacturing Co., Inc.
Applications
  • Electrical power distribution
  • Signal transmission
  • Equipment interconnection
General Description

The Bit,wire Wrapping Tool, cataloged under National Stock Number 5120-00-051-3857, is classified within Federal Supply Class 5120 (No Item Name Available) of the Hand Tools group. The primary manufacturer of record is A.w. Mack Manufacturing Co., Inc.. Government technical data includes 1 verified specification, sourced from the Federal Logistics Information System (FLIS). This item has 9 commercial cross-references from 7 manufacturers, enabling identification through both NSN and commercial part number lookups. 11 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5120-00-051-3857
Primary Part Number3857
Item NameBit,wire Wrapping Tool
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerA.w. Mack Manufacturing Co., Inc.
StatusACTIVE
General Characteristics Item DescriptionFOR 26 AWG WIRE; MODIFIED WRAP; 0.070 IN. (1.78MM) TERMINAL HOLE DIA; 1 IN. (25.4MM) TERMINAL HOLE DEPTH MM
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 11
3110-00-141-99870385-7 INTERCHANGEABLE
Bearing,ball,annular
Honeywell International Inc. Dba Honeywell International Div Aerospace - Tempe (west Warner Road)
2945-00-595-29210S12223 INTERCHANGEABLE
Filter,fluid
Falls Filtration Technologies, Inc.
5330-00-709-7434 INTERCHANGEABLE
Gasket
5325-00-912-0468 INTERCHANGEABLE
Insert,screw Thread
4820-01-219-86573857 INTERCHANGEABLE
Valve Assembly
Kearflex Engineering Company
9150-01-318-6008 INTERCHANGEABLE
Lubricating Oil,engine
3990-01-340-533535M/1500 INTERCHANGEABLE
Tie Down,cargo,vehicle
Peck & Hale, Llc
6220-01-417-3321502118 INTERCHANGEABLE
Panel,indicating,light Transmitt
Airco Industries, Inc. Dba Photo Etch Div Photo Etch
4820-01-441-4690502-118 INTERCHANGEABLE
Valve,globe
Aalberts Integrated Piping Systems Americas, Inc.
5340-01-665-8804304-C-6 INTERCHANGEABLE
Cap-Plug,protective,dust and Moi
J.w.f. Technologies, Llc
Cross-Reference Index
Part NumberManufacturer
WB2669M O K Intl Inc (USA)
WB2669M Ok International Gmbh (DEU)
3857 PRIMARY A.w. Mack Manufacturing Co., Inc. (USA)
502118 Apex Tool Group, Llc (USA)
AWM91869 A.w. Mack Manufacturing Co., Inc. (USA)
502118 Cooper Industries Inc Dba Cooper Tools (USA)
3857 Jonard Industries Corporation Dba Jonard Tools (USA)
502118 Apex Tool Group (USA)
WB2669M Jonard Industries Corporation Dba Jonard Tools (USA)
Related Parts
3110-00-141-9987INTERCHANGEABLE
BEARING,BALL,ANNULAR
0385-7
2945-00-595-2921INTERCHANGEABLE
FILTER,FLUID
0S12223
5330-00-709-7434INTERCHANGEABLE
GASKET
5325-00-912-0468INTERCHANGEABLE
INSERT,SCREW THREAD
4820-01-219-8657INTERCHANGEABLE
VALVE ASSEMBLY
3857
9150-01-318-6008INTERCHANGEABLE
LUBRICATING OIL,ENGINE
3990-01-340-5335INTERCHANGEABLE
TIE DOWN,CARGO,VEHICLE
35M/1500
6220-01-417-3321INTERCHANGEABLE
PANEL,INDICATING,LIGHT TRANSMITT
502118
4820-01-441-4690INTERCHANGEABLE
VALVE,GLOBE
502-118
5340-01-665-8804INTERCHANGEABLE
CAP-PLUG,PROTECTIVE,DUST AND MOI
304-C-6
6625-01-718-1700INTERCHANGEABLE
OSCILLOSCOPE

Frequently Asked Questions

What is NSN 5120-00-051-3857?

NSN 5120-00-051-3857 is a Bit,wire Wrapping Tool, manufactured by A.w. Mack Manufacturing Co., Inc., classified under FSC 5120 (No Item Name Available). Status: active.

What are the part numbers for NSN 5120-00-051-3857?

NSN 5120-00-051-3857 has 9 cross-referenced part numbers: WB2669M (O K Intl Inc), WB2669M (Ok International Gmbh), 3857 (A.w. Mack Manufacturing Co., Inc.), 502118 (Apex Tool Group, Llc), AWM91869 (A.w. Mack Manufacturing Co., Inc.) and 4 more.

What NSN replaces 5120-00-051-3857?

There are 11 known substitutes for 5120-00-051-3857: 3110-00-141-9987, 2945-00-595-2921, 5330-00-709-7434 and 8 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 3857?

Key specifications for 3857: General Characteristics Item Description: FOR 26 AWG WIRE; MODIFIED WRAP; 0.070 IN. (1.78MM) TERMINAL HOLE DIA; 1 IN. (25.4MM) TERMINAL HOLE DEPTH MM. 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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