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1.800.289.2779

Main Menu

Products

Shop By Category
Fastener Coatings
Fastener Materials

Manufacturers

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Inventory and Supply Chain Management
Assembly Technology and Engineering

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Aerospace & Defense Fastening Solutions
Data Center Fastening Solutions
Fastening Solutions for Electric Vehicles

Contact Us

Acquisitions
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Shop By Category

Abrasives

Abrasive Bands
Abrasive Pads
Cut-off Wheels
Grinding Wheels
Sander Accessories
Sanders & Belt Tooling
Sanding Belts
Sanding Discs
Sandpaper Sheets

Anchors

Article Numbers

Bonding Fasteners

Composite Fasteners
Female Size - FB20
Female Size - FB30
Female Size - FB38A
Male Size - MB20
Male Size - MB30
Male Size - MB38A

Captive Mount Hardware

Captive Hardware Installation Tooling
Captive Nuts
Captive Panel Fasteners
Captive Panel Screws
- Panel Screw Retainer
Quarter-Turn Fasteners
Screws

Card Guides & Ejectors

Card Guides, Wedge Loks, Card Loks & Lok Tainers
Ejectors
Inserter & Extractors
PCB Coding Key
Retainers
Retaining Rings & Clips

Casters & Levelers

Bumpers
Level Base Pads
Leveler Guides

Connectors

Clincher Receptacles
Connectors
Jumper Assembly
Switching Relays
Terminals
Wire Ferrules

Electronic Hardware

Circuit Board Hardware
Electronic Components & Hardware
Grommets
Jack Screws
Jacks
Locking Hole Plugs
Tube Inserts and Guides

EMI

RFI Shielding & Metal Gaskets

Fans

AC & DC Fans
Fan Gaskets
Fan Guards
Fan Mounts

General Hardware

Ball Studs
Bearings
Blind Threaded Inserts
Captive Panel Screws
Clamps
Fan Guards
Hand Tools
Industrial Hardware
Mil Spec Fasteners
Miscellaneous Hardware
Pipe & Tube Fittings
Plugs
Plungers
Power Transmission
Safety Equipment
Sanding Discs
Screws
Specialized Tools
Springs
Washers

Handles

Electronic Access Solutions
Knobs
Pull Handles

Inserts

Blind Threaded Inserts
Insert Installation Tools and Repair Kits
Inserts (Rivet Nuts, Helical Screw etc.)
Threaded Inserts

Latches, Locks & Hinges

Cam Latches
Clincher Latches
Compression Latches
Hinges
Latch,Lock and Hinge Accessories
Latches & Catches
Locks

LED & LCD Products

LED & Light Pipes
LED Assembly
LED Indicators
PCB LED Holders

Miscellaneous Hardware

Mounts & Lifts

Display Mounts
Hinges
- Counterbalance Solutions

Raw Materials

Rivets

Blind
- Breakstem Rivets
Blind Rivet Cordless Rivet Tooling
Closed-End Rivets
Hand Rivet Tooling
Hydro-pneumatic Rivet Tooling and Accessories
Non-Structural Rivets
Push-in Rivets
Rivets
Speed Riveting
Threaded Insert Rivet Power Tooling

Safety Equipment & Accessories

Ear Protection
Respirators and Accessories

Self-Clinching Hardware

Fasteners for Permanent Sheet Metal Joining
Nuts
- Broaching Nuts
- Self-Clinching Nuts
Panel Fasteners
Pins
- Self-Clinching Pins
Self-Clinching Nuts
Self-Clinching Standoffs
Studs
- Broaching Studs
- Self-Clinching Studs
Surface Mount Right Angle Fasteners

Shielding & Gasketing

Absorbers
EMI
- RFI Shielding & Metal Gaskets
Fabric over Foam
Sealing Gaskets
Sealing Plugs

Slides

Heavy Duty Slides (170 lb. -1323 lb.)
Light Duty Slides (139 lb. or Less)
Linear Track Systems
Medium Duty Slides (140 lb. - 169 lb.)
Rack Mounting Hardware
Slide
- Slide Assembly
Slide Accessories

Standoffs & Spacers

Spacers
Spacers & Standoffs
Standoffs

Studs & Pins

Studs

Tape & Adhesives

Adhesive Tapes
Adhesives
Conductive Tape
Safety Tape
VHB Tape

Tooling

Captive Hardware Installation Tooling
Haeger Tools and Accessories
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Keys
Kitting
Power Tool Accessories
Specialized Tools

Wire & Cable Management

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Disconnects
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Fiber Splice Holders
Fiber Storage Wheels
Heat Shrink Tubings
Rigging (Cable, Wire & Accessories)
Spring Clips
Wire Ducts
Wire Harness
Wire Protection Bushings
Wire Saddles

Shop By Brand

PEM / PENN ENGINEERING PRODUCTS

BOSSARD

SOUTHCO

ARTICLE NUMBERS

METRIC PRODUCT

LAIRD TECHNOLOGIES ELECTRONIC COMPONENTS

HELI-COIL / STANLEY ENGINEERED FASTENING

MIL SPEC NUMBERS

POP AVDEL

RAF ELECTRONIC HARDWARE

ATLAS BLIND THREADED INSERTS

PANDUIT

AVDEL

ESSENTRA/RICHCO

NORTON ABRASIVES

ACCURIDE

3M ELECTRONICS PRODUCTS

WM BERG/REXNORD

THOMAS & BETTS

MISC ELECTRONIC COMPONENTS

HAEGER

MISC CONSUMABLES

LYNTRON

RBC BEARING/PIC DESIGN

HEYCO

AMATOM

AVK INDUSTRIAL PRODUCTS

INDUSTRIAL RIVET

VLIER

BIGHEAD

SFC KOENIG

Keystone Electronic Hardware

Dynabrade Industrial Abrasive Tooling

Stanley Engineered Fastening Solutions

FASTEKS FILKO

KVT MISC HARDWARE

AMPHENOL ICC

WAGO

KATO

MISC SPACERS AND STANDOFFS

Dodge/SEF

EJOT

SPIRALOCK

DELTA_PT®

ecosyn®

ABBATRON

NIELSEN HARDWARE

QUALTEK CORP

SUGATSUNE

NELSON

SUNON

ALCOA

KOENIG_EXPANDER®

NORD-LOCK

ROTOR CLIP®

RIPP LOCK

ARaymond®

MISC EMI/RFI GASKET

SPIROL®

MICROSEMI

MM-Welding®

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Self-Clinching Hardware
Nuts
MS21043-4 by MIL SPEC NUMBERS

MS21043-4 by MIL SPEC NUMBERS

MS21043-4 by MIL SPEC NUMBERS

MS21043-4 by MIL SPEC NUMBERS

MIL SPEC NUMBERS

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MS21043-4

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Product Description

LOCKNUT

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SKU:: MS21043-4

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