
A hex key, also known as an Allen Key, Allen wrench or hex wrench is a small L shaped or T shaped tool with a 6-sided hexagonal tip which is used to loosen hex socket screws or bolts.

### Types of Hex Key

**L-Shaped Hex Keys:** L Shaped Hex Keys or [L Keys](https://uk.rs-online.com/web/c/hand-tools/screwdrivers-hex-torx-keys/hex-keys/?applied-dimensions=4294379624) are the most common type of hex key with a hexagonal tip at each end

**T-Shaped Hex Keys:** T-shaped hex keys or [T bar Allen Keys](https://uk.rs-online.com/web/c/hand-tools/screwdrivers-hex-torx-keys/hex-keys/?applied-dimensions=4294379631) have a crossbar or T shaped handle at the end which provides a better grip

**Folding Allen Key Sets:** [Folding Allen Key Sets](https://uk.rs-online.com/web/c/hand-tools/screwdrivers-hex-torx-keys/hex-keys/?applied-dimensions=4290511960) consist of an outer casing from which a selection of different sized Allen keys can be unfolded, a bit like a penknife or multi-tool

Hex keys or Allen keys are available in metric sizes and imperial sizes [Imperial Allen Keys](https://uk.rs-online.com/web/c/hand-tools/screwdrivers-hex-torx-keys/hex-keys/?applied-dimensions=4294407154). They are also available in [Allen Key Sets](https://uk.rs-online.com/web/c/hand-tools/screwdrivers-hex-torx-keys/hex-keys/?applied-dimensions=xyz) which include a range of popular hex key sizes including [12mm Allen keys](https://uk.rs-online.com/web/c/hand-tools/screwdrivers-hex-torx-keys/hex-keys/?applied-dimensions=4291389928). RS also supply Allen keys from leading brands such as [Wera Allen Keys](https://uk.rs-online.com/web/c/hand-tools/screwdrivers-hex-torx-keys/hex-keys/?applied-dimensions=4294964448), [Wera Allen Key Sets](https://uk.rs-online.com/web/c/hand-tools/screwdrivers-hex-torx-keys/hex-keys/?applied-dimensions=xyz) and [Bondhus Allen Keys](https://uk.rs-online.com/web/c/hand-tools/screwdrivers-hex-torx-keys/hex-keys/?applied-dimensions=4294966929)

For more information please refer to our [Hex Keys Guide](https://uk.rs-online.com/web/content/discovery/ideas-and-advice/hex-keys-guide)

For our range of hex socket screws please see [Socket Screws](https://uk.rs-online.com/web/c/fasteners-fixings/screws-bolts/socket-screws/)



Hex Keys

Screwdrivers, Hex & Torx Keys

Hand Tools

Electrical, Automation & Cables

Automation & Control Gear

Automation Signalling

Contactors & Auxiliary Contacts

Electric Motors

Industrial Robots

PLCs, HMIs & Industrial Computing

Process Control

Sensors

Solenoids

Cables & Wires

AV Cables

Cable Glands & Fittings

Cable Joints & Cable Sleeving

Cable Management

Cable Ties & Fixings

Computer Cables

Electrical Power & Industrial Cables

Networking & Coaxial Cables

Single Core Cable

Wire to Board Cables & Ribbon Cable

Enclosures & Server Racks

19-Inch Racking

Enclosures

Enclosures & Racking Components

Fuses & Circuit Breakers

Circuit Breakers

Earth & Lightning Protection

Fuse Holders & Accessories

Fuses

HVAC, Fans & Thermal Management

Air Conditioning & Fans

Air Conditioning & Heating Accessories

Building Automation

Electronics Heating & Cooling Components

Fan Accessories

Lighting

Light Bulbs, Lamps & Tubes

Light Fittings, Fixtures & Luminaires

Lighting Components

Torches & Inspection Lamps

Relays & Signal Conditioning

Relay Accessories

Relays

Signal Conditioners & Isolators

Switches

Capacitive, Magnetic and Piezo Switches

DIP & Rotary Encoded Switches

Domestic Installation Switches

Foot Switches & Components

Joysticks & Components

Key Switches & Selector Switches

Keyboard & Keypad Switches

Limit & Position Switches

Micro Switches & Detector Switches

Push Button Switches & Components

Rocker Switches & Components

Rope Pull Switches & Components

Rotary Switches & Components

Safety Enabling & Control Switches

Safety Interlock Switches & Components

Switch Disconnectors & Components

Toggle Switches & Slide Switches

Electronic Components, Power & Connectors

Batteries & Chargers

Battery & Charger Accessories

Battery Chargers & Power Banks

Non-Rechargeable Batteries

Rechargeable Batteries

Connectors

AV Connectors

Automotive Electrical Connectors

Backplane & Rack Connectors

Circular Connectors

IC Sockets & Adapters

Mains & DC Power Connectors

Network & Telecom Connectors

PCB Connectors & Wire Housings

Power Connectors

RF Coaxial Connectors & Adapters

Terminal Blocks

USB, D Sub & Computing Connectors

Wire Terminals & Splices

Displays & Optoelectronics

Display Modules

Fibre Optic Components

Indicators & Indicator Components

LED Indicators & Accessories

LED Lighting Components

LEDs - Light Emitting Diodes

Laser Modules & Components

Optocouplers & Photodetectors

ESD Control, Cleanroom & PCB Prototyping

ESD Control & Clean Room

PCB Etching, Preparation & Developing

PCB Handling

PCB Spacers, Pillars & Supports

PCB Tools

Prototyping Boards

Passive Components

Antennas

Capacitors

Crystals, Oscillators & Resonators

EMI Filters & Protection

Fixed Resistors

Inductors

Passive Components Kits

Rotary Encoders

Sounder, Buzzer & Microphone Components

Surge Protection Components

Variable Resistors

Power Supplies & Transformers

Power Supplies

Renewable Energy

Transformers

Voltage Converters

Raspberry Pi, Arduino, ROCK, STEM Education & Development Tools

Arduino Shop

BBC micro:bit Shop

Development Tools & Single Board Computers

ROCK SBC Shop

Raspberry Pi Shop

STEM Education

Semiconductors

Amplifiers & Comparators

Audio & Video ICs

Chip Programmers & Debuggers

Clock, Timing & Frequency ICs

Communication & Wireless Module ICs

Data Converters

Discrete Semiconductors

Display Drivers & Controllers

Interface ICs

Logic ICs

Memory Chips

Power Management ICs

Processors & Microcontrollers

Programmable Logic ICs

Sensor ICs

Mechanical, Fluid Power & Tools

Access, Storage & Material Handling

Ladders & Steps

Material Lifting & Loading Equipment

Storage & Shelving

Transit & Equipment Cases

Trucks, Trolleys & Lifting Tables

Adhesives, Sealants & Tapes

Adhesive, Sealant & Tape Dispensers

Adhesives & Glues

Sealants & Resins

Tapes

Bearings & Seals

Gaskets, Seals & Packings

Linear Motion

Rotary Bearings & Housing Units

Engineering Materials & Industrial Hardware

Anti Vibration & Levelling Components

Carbon Fibre & Felt Sheets

Castors & Wheels

Ceramic Materials

Channel Support Systems

Conveyor Components

Insulation Materials

Knobs, Levers & Handles

Metal Materials

Plastic & Rubber Materials

Polishing & Finishing

Shim Stock

Structural Systems

Fasteners & Fixings

Clips & Springs

Girder Fixings

Magnets & Magnetic Strips

Nails & Rivets

Nuts & Washers

Pins, Keys & Retaining Clips

Screws & Bolts

Sheet Metal & Panel Fasteners

Spacers & Standoffs

Wall Plugs, Fixings & Anchors

Cable, Connector & Crimping Tools

Clamps & Vices

Hammers & Demolition

Knives, Scissors & Saws

Manual Grease Guns & Accessories

Measuring & Marking

Pliers & Cutters

Sanding, Filing & Polishing

Spanners, Sockets & Wrenches

Specialist Tools

Staplers & Riveters

Threading Tools

Tool Kits & Tool Storage

Mechanical Power Transmission

Belts & Pulleys

Brakes & Clutches

Bushes & Collars

3mm Allen Keys

0 Products showing for 3mm Allen Keys

Popular Searches

Related links