PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

28-228Wrench,open End and Flarenut,com

Apex Tool Group, Llc Dba Nicholson · NSN 5120-01-127-5639 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-01-127-5639 — this item is cataloged by the U.S. Government under National Stock Number 5120-01-127-5639. Primary manufacturer part number: 28-228.
Features
  • Wrench,open End and Flarenut,com — FSC 5120
  • General Characteristics Item Description: STEEL; CHROME PLATED; DOUBLE HEAD; 6 POINT FLARENUT END; 7/8 IN. OPENINGS AT BOTH ENDS; 0.380 IN. OPEN END HEAD THICKNESS; 0.520 IN. FLARENUT END HEAD THICKNESS; 12-1/8 IN. LG IN
  • 4 verified cross-references
  • Primary manufacturer: Apex Tool Group, Llc Dba Nicholson
Applications
  • Field maintenance and repair
  • Facility maintenance operations
  • General-purpose hand tools
General Description

The Wrench,open End and Flarenut,com, cataloged under National Stock Number 5120-01-127-5639, is classified within Federal Supply Class 5120 (No Item Name Available) of the Hand Tools group. The primary manufacturer of record is Apex Tool Group, Llc Dba Nicholson. Government technical data includes 1 verified specification, sourced from the Federal Logistics Information System (FLIS). This item has 4 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
NSN5120-01-127-5639
Primary Part Number28-228
Item NameWrench,open End and Flarenut,com
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerApex Tool Group, Llc Dba Nicholson
StatusACTIVE
General Characteristics Item DescriptionSTEEL; CHROME PLATED; DOUBLE HEAD; 6 POINT FLARENUT END; 7/8 IN. OPENINGS AT BOTH ENDS; 0.380 IN. OPEN END HEAD THICKNESS; 0.520 IN. FLARENUT END HEAD THICKNESS; 12-1/8 IN. LG IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5950-00-081-80301328 INTERCHANGEABLE
Saturable Reactor
Precision Electronics, Inc
3110-00-100-0346 INTERCHANGEABLE
Cup,tapered Roller Bearing
5950-00-163-21721328 INTERCHANGEABLE
Transformer,special
S and H Industries
5120-00-240-5609 INTERCHANGEABLE
Wrench,open End
4920-00-345-89861328 INTERCHANGEABLE
Gage Kit,inspection
Mcmaster-Carr Supply Co
5330-00-399-69194004061 INTERCHANGEABLE
Gasket
Agco Corp Parts Opn
5962-00-438-4170350-3039-010 INTERCHANGEABLE
Integrated Circuit,
Rockwell Collins, Inc. Dba Collins Aerospace Government Systems Div Collins Aerospace - Government Systems
4320-00-689-5717036632 INTERCHANGEABLE
Plate,wear,rotary Pump
Crane Pumps & Systems Pft Corp Div Crane Pumps & System Pft Corp.
5910-00-721-173113-28 INTERCHANGEABLE
Capacitor,variable,ceramic Diele
Keysight Technologies Inc
6685-00-856-14851328 INTERCHANGEABLE
Psychrometer
Sybron-Taylor Instrument Co
Cross-Reference Index
Part NumberManufacturer
28-228 Apex Tool Group, Llc Dba Nicholson (USA)
1328 Armstrong Bros Tool Co (USA)
28-228 Armstrong Bros Tool Co (USA)
28-228 Easco Hand Tools Inc Dba Danaher Tool Group Div Danaher Tool Group Easco Hand Tools Inc. (USA)
Related Parts
5950-00-081-8030INTERCHANGEABLE
SATURABLE REACTOR
1328
3110-00-100-0346INTERCHANGEABLE
CUP,TAPERED ROLLER BEARING
5950-00-163-2172INTERCHANGEABLE
TRANSFORMER,SPECIAL
1328
5120-00-240-5609INTERCHANGEABLE
WRENCH,OPEN END
4920-00-345-8986INTERCHANGEABLE
GAGE KIT,INSPECTION
1328
5330-00-399-6919INTERCHANGEABLE
GASKET
4004061
5962-00-438-4170INTERCHANGEABLE
INTEGRATED CIRCUIT,
350-3039-010
4320-00-689-5717INTERCHANGEABLE
PLATE,WEAR,ROTARY PUMP
036632
5910-00-721-1731INTERCHANGEABLE
CAPACITOR,VARIABLE,CERAMIC DIELE
13-28
6685-00-856-1485INTERCHANGEABLE
PSYCHROMETER
1328
5330-00-966-8756INTERCHANGEABLE
PACKING
1328
5930-00-987-1516INTERCHANGEABLE
SWITCH,ROTARY
684-452-9003

Frequently Asked Questions

What is NSN 5120-01-127-5639?

NSN 5120-01-127-5639 is a Wrench,open End and Flarenut,com, manufactured by Apex Tool Group, Llc Dba Nicholson, classified under FSC 5120 (No Item Name Available). Status: active.

What are the part numbers for NSN 5120-01-127-5639?

NSN 5120-01-127-5639 has 4 cross-referenced part numbers: 28-228 (Apex Tool Group, Llc Dba Nicholson), 1328 (Armstrong Bros Tool Co), 28-228 (Armstrong Bros Tool Co), 28-228 (Easco Hand Tools Inc Dba Danaher Tool Group Div Danaher Tool Group Easco Hand Tools Inc.).

What NSN replaces 5120-01-127-5639?

There are 12 known substitutes for 5120-01-127-5639: 5950-00-081-8030, 3110-00-100-0346, 5950-00-163-2172 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 28-228?

Key specifications for 28-228: General Characteristics Item Description: STEEL; CHROME PLATED; DOUBLE HEAD; 6 POINT FLARENUT END; 7/8 IN. OPENINGS AT BOTH ENDS; 0.380 IN. OPEN END HEAD THICKNESS; 0.520 IN. FLARENUT END HEAD THICKNESS; 12-1/8 IN. LG IN. 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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