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Please refer to the table below for  the hexagon key sizes for metric cap screws, countersunk socket screws and grub screws. Please scroll down the page if you wish to purchase a correct size key, or a hexagon ball-end driver (screw driver with ground ball/hexagon end allowing fast off centre driving). Metric and inch sizes are listed

It is essential to use the correct key size for driving cap screws and grub screws etc. In particular, when tightening the smaller sizes of grub screws, using an incorrect key (which may appear to be the correct size before higher torques are applied ) can lead to rounding off of the hexagon socket making removal or further tightening extremely difficult if not impossible.  

This information is supplied in good faith and is correct to the best of our knowledge.

Inch size keys for our BA and UNC socket cap screws range are also available below.

PLUS TOP QUALITY NUT SPINNERS FOR FAST TIGHTENING OF HEXAGON BOLT HEADS AND NUTS - SEE BOTTOM OF THIS PAGE

TEE HANDLE DRIVERS AND FOLD-UP ALAN KEY SETS ALSO NOW STOCKED IN A SELECTION OF SIZES

PIN-VICES (sometimes known as hand vices or hand chucks) - EXCELLENT FOR FINE HAND DRILLING, HOLDING SOLDER WIRE AND HOLDING BINDING WIRE ETC.

Looking for our large range of drill bits and new range of 'Snappy' quick change drill bits?
These are listed in our Taps, Dies and Drills section - please click here.

Quick Links to item on this page
Click on the images to go direct to each item list.
Images are indicative only and exact forms may vary.
  Hexagon Keys
Metric and Inch sizes
  Fold-up key Sets
Metric and Inch sizes
 
             
  Ball Drivers
Metric and Inch sizes
  Ball Driver Sets
Metric and Inch sizes
 
             
  Tee Handle  Hex Drivers
Metric and Inch sizes
  Nut Spinners  
             
  New Product! Metric
Swivel Head Wrenches
  Back in Stock!
Pin Vices
 
             
    Combination and Open Ended
Spanners
 
Our new range of Swann Morton craft scalpels, knives and blades
             
 

Individual Stanley 'Fatmax' Screwdrivers and Precision Screw driver sets

 
             

A/F is the dimension across opposite flat sides of the hexagon key in millimetres and is the nominal key size.

Socket Cap Screws Grub Screws Socket Countersunk & Button Head Screws
(Metric) (Metric) (Metric)
Thread A/F (mm) Thread A/F (mm) Thread A/F (mm)
M1.6 1.5   M1.6 0.7   - -
M2 1.5 M2 0.9 M2 / M2.3 1.3
M2.5/ 2.6 2 M2.5 1.3 M2.5 1.5
M3 2.5 M3 1.5 M3 2
M3.5* 2.5        
M4 3 M4 2.0 M4 2.5
M5 4 M5 2.5 M5 3
M6 5 M6 3 M6 4
M8 6   M8 4   M8 5
M10 8 M10 5 M10 6

* M3.5x50mm cap screws require a 2.8mm A/F hex key.

 

Sizes for BA and UNC below have been converted from inches

Socket Cap Screws   Grub Screws   Socket Cap Screws   Socket Countersunk & Button Head Screws   Grub Screws
(BA)   (BA)   (UNC)   (UNC & UNF)   (UNC & UNF)
Thread A/F (mm)   Thread #]   Thread A/F (mm)   Thread A/F (mm)   Thread A/F (mm)
                           
2BA 4.0 (5/32")   2BA 2.4 (3/32")   No 2 2.0 (5/64")   No 2 1.3(0.05")   No 2 0.9
4BA 2.4 (3/32")   3BA 2.0 (5/64")   No 3 2.0 (5/64")            
6BA 2.0 (5/64")   4BA 1.6 (1/16")   No 4 2.4 (3/32")   No 4 1.6 (1/16")   No 4 1.3(0.05")
8BA 1.6 (1/16")   6BA 1.3 (0.05")   No 5 2.4 (3/32")         No 5 1.6 (1/16")
            No 6 2.8 (7/64")   No 6 2.0 (5/64")   No 6 1.6 (1/16")
            No 8 3.6 (9/64")   No 8 2.4 (3/32")   No 8 2.0 (5/64")
            No 10 4.0 (5/32")   No 10 3.2 (1/8")   No 10 2.4 (3/32")
            1/4 4.75 (3/16")   1/4 4.0 (5/32")   1/4 3.2 (1/8")

We can supply hexagon keys to suit the above sizes :- or scroll down the page for hex-ball drivers

All prices include 20% VAT  Click here for details

  Single Hexagon Keys
Hardened steel 'L' form wrenches - black finish
Orders of 50 keys (of the same size) are automatically discounted at -10%

See below for Hexagon Key Sets

A/F dim

 Length (mm)

Pack Qty

MF Ref

Price   You can enter/change the number of items on the order form
(nom key size)
0.7 (0.027") 30 1 MF-HK-07 £0.60

0.9 (0.035") 38 1 MF-HK-09 £0.60

1.3 (0.05") 41 1 MF-HK-13 £0.60

1.5 45 1 MF-HK-15 £0.50

1.6 (1/16") 45 1 MF-HK-16 £0.60

2.0* 50 1 MF-HK-20 £0.50

2.4 (3/32") 50 1 MF-HK-24 £0.60

2.5 56 1 MF-HK-25 £0.50

2.8 (7/64") 56 1 MF-HK-28 £0.60

3 63 1 MF-HK-30 £0.50

3.2 (1/8") 63 1 MF-HK-32 £0.60

3.6 (9/64") 63 1 MF-HK-36 £0.60

4 70 1 MF-HK-40 £0.60

4.75 (3/16") 80 1 MF-HK-475 £0.60

5 80 1 MF-HK-50 £0.60

6.35 (1/4") 90 1 MF-HK-635 £0.70

* For 2mm A/F sockets, we also stock 85mm long reach allen keys, hexagon ball-end screwdrivers, and bit inserts for electric and manual socket screw drivers. 

For these items please go to our servo screw page.

If the size you require isn't listed please e mail us for a no-obligation quotation.

Imperial (inch) sizes also available on application

All prices include 20% VAT  Click here for details

Metric & Inch sizes Fold-Up Hexagon ('Allen') key sets

Bondhus high quality fold up allen keys mounted in a soft feel ergonomic case.
Keys can be opened through a full 180 degree arc, which enables continuous driving in tight spots without the need to continuously re-insert the key.
Type

Hex sizes included

MF Ref

Price You can enter/change the number of items on the order form
Each 
         
Metric 1.5,2,2.5,3,4,5,6mm MF-BFK-10 £6.45

(Red handle)
     
Inch

0.05, 1/16, 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 3/16"

MF-BFK-20 £7.30

(Yellow handle)
         
Twin Set Deal Order both the above sets and save 10% MF-BFK-30 £12.40

         

All prices include 20% VAT  Click here for details

 

Swivel Head Wrenches
By Bondhus

These wrenches are particularly useful for driving Socket Cap screws, Button heads and Grub screws where nearby obstructions make access awkward. By altering the angle of the long handle, screws can be rotated without having to repeatedly remove the driver from the socket.
Both ends are hexagonal so the wrench can also be used as a long reach allen key.

Hex
Size
A/F (mm)
Suitable For Driving: Short
Arm
Length (mm)
Long
Arm
Length (mm)
MF Ref Price
Each
You can enter/change the number of items on the order form
Cap
Screw
Button
Head
Grub
Screw
                 
3 M4 M5 M6 25 100 MF-BSHW3 £7.25

             
4 M5 M6 M8 31 107 MF-BSHW4 £7.40

             
5 M6 M8 M10 35 121 MF-BSHW5 £7.60

               

 

 Metric Hexagon Ball-Drivers

 Bondhus high quality tools for fast off-centre driving of
Metric grub and cap screws

Please note that the sizes below are the A/F dimension, the across flats dimension of the socket they fit. This is not the metric screw size they are used to tighten. As an example, an M2 metric cap screw requires a 1.5mm A/F driver, not a 2mm driver.
If in doubt of the size you require, please scroll further up this page where you will find a
table of driver sizes for various screw types and sizes.

A/F dim

 Blade 

Handle MF Ref Price You can enter/change the number of items on the order form
(mm) length (mm) Length (mm) Each 
           
1.5 65 55 MF-BD-15 £2.60

2.0 70
(std length)
55 MF-BD-20 £2.75

         
2.0 98
(long series)
55 MF-BD-20L £3.25