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UNC Button Heads

Home Up Miniature Cap Screws H.T Steel Cap Screws Stainless Steel Cap Screws UNC Cap Screws Stainless Steel UNC Cap Screws UNF Cap Screws Stainless Steel UNF Cap Screws BA Cap Screws BSW Cap Screws Cap Screw Boxed Kits HT Button heads HT Flanged Button Heads Stainless Button Heads Stainless Flanged Button Heads UNC Button Heads Stainless UNC Button Heads UNF Steel Button Heads HT Metric Countersunks Stainless Metric Countersunks UNC HT Countersunks Stainless UNC Countersunks UNF HT Countersunks

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You are here - Home > Fixings > Socket Screws > UNC Steel Button Head Screws
   
 

The lists below show our range of UNC HT Steel Button Head socket screws.

To order, click on the 'Add to Order' button alongside the item of your choice. You can select the quantity on the order form (default is 1). To continue ordering other items, use the 'Continue Shopping' button on the order form.

Socket sizes are stated in millimetres (imperial sizes have been converted to metric). If you need a key, click on the symbol in the tables below and you will be taken to the allen key and ball driver page.

Alternatively,

Please click here

You can review and edit your order, or submit your order at any time by using the button at the bottom of each list.

We also stock button head screws in Metric HT Steel and stainless steel - please use the buttons above to go to these pages.

For a guide to suitable washers, please scroll to the bottom of the page or click here

Button heads have a smaller socket size and shallower depth socket than the equivalent sized cap screw and so more care should be taken not to over-torque, especially on the very small sizes, to avoid rounding of the socket edges.

It's also crucial to ensure that your hex key of driver is completely inserted before applying significant torque.

We do not recommend the use of T handle drivers on socket button head screws below 8 UNC size due to the ease of inadvertent over-tightening with this style tool.

If your application is for a high torque connection or the screws will be regularly removed and re-used, we would suggest that a socket cap screw is considered.

UNC Button Head Dimensions 'D' & 'AF' in mm (see dimension drawing below)
Thread 2-56 4-40 6-32 8-32 10-24 1/4-20
Head Dia 'D'* 3.9 5.2 6.4 7.8 9.0 10.8
Socket Size 'AF' 1.27 1.6 2.0 2.4 3.2 4.0
*Head dimensions are nominal and may vary marginally from batch to batch.
 
Please scroll down this page to the thread size you require, or click on the links below
2 UNC
(2-56)		   3 UNC
(3-48)		   4 UNC
(4-40)		   5 UNC
(5-40)		   6 UNC
(6-32)		   8 UNC
(8-32)		   10 UNC
(10-24)		   1/4 UNC
(1/4-20)

All prices include 20% VAT  Click here for details

Button Head Socket Screws

UNC Threads - High Tensile Steel 
Thread

Length L*

 Socket
size		 Pack Qty

MF Ref

 Price You can enter/change the number of items on the order form
Inches mm AF
               
2 UNC              
           
2-56 3/16 4.76 5 MF-BH100 £0.85

25 MF-BH100/25 £3.60

               
2-56 1/4 6.35 5 MF-BH101 £0.85

25 MF-BH101/25 £3.60

               
2-56 3/8 9.5 5 MF-BH102 £0.85

25 MF-BH102/25 £3.60

               
2-56 1/2 12.7 5 MF-BH103 £0.85

25 MF-BH103/25 £3.60

               
2-56 3/4 19.05 5 MF-BH105 £1.15

25 MF-BH105/25 £4.60

               
Driving Tools for 2 - 56 UNC Socket Button Head Screws
               
1.27mm (0.05") Hex/Allen Key MF-HK-13 £0.60

1.27mm Hex/Ball Driver MF-BD-13 £2.75

               
             
3 UNC              
           
               
3-48 1/4 6.35 5 MF-BH161 £0.85

25 MF-BH161/25 £3.60

               
3-48 3/8 9.5 5 MF-BH162 £0.85

25 MF-BH162/25 £3.60

               
Driving Tools for 3 - 48 UNC Socket Button Head Screws
               
1.6mm (1/16") Hex/Allen Key MF-HK-16 £0.60

1/16" Hex/Ball Driver MF-BD-62 £2.75

             
4 UNC              
           
4-40 3/16 4.8 5 MF-BH109 £0.85

25 MF-BH109/25 £3.60

               
4-40 1/4 6.35 5 MF-BH110 £0.85

25 MF-BH110/25 £3.60

               
4-40 3/8 9.5 5 MF-BH111 £0.85

25 MF-BH111/25 £3.60

               
4-40 1/2 12.7 5 MF-BH112 £0.85

25 MF-BH112/25 £3.60

             
4-40 3/4 19.05 5 MF-BH114 £1.15

25 MF-BH114/25 £4.60

               
4-40 1 25.4 5 MF-BH115 £1.15

25 MF-BH115/25 £4.60

               
Driving Tools for 4 - 40 UNC Socket Button Head Screws
               
1.6mm (1/16") Hex/Allen Key MF-HK-16 £0.60

1/16" Hex/Ball Driver MF-BD-62 £2.75

             
5 UNC              
           
               
5-40 1/4 6.35 5 MF-BH171 £0.85

25 MF-BH171/25 £3.60

               
5-40 3/8 9.5 5 MF-BH172 £0.85

25 MF-BH172/25 £3.60

               
5-40 1/2 12.7 5 MF-BH173 £0.85

25 MF-BH173/25 £3.60

               
5-40 3/4 19 5 MF-BH175 £0.85

25 MF-BH175/25 £3.60

               
Driving Tools for 3 - 48 UNC Socket Button Head Screws
               
1.6mm (1/16") Hex/Allen Key MF-HK-16 £0.60

1/16" Hex/Ball Driver MF-BD-62 £2.75

             
6 UNC              
           
6-32 1/4 6.35 5 MF-BH120 £0.85

25 MF-BH120/25 £3.60

               
6-32 3/8 9.5 5 MF-BH121 £0.85

25 MF-BH121/25 £3.60

               
6-32 1/2 12.7 5 MF-BH122 £0.85

25 MF-BH122/25 £3.60

               
6-32 5/8 15.9 5 MF-BH123 £0.85

25 MF-BH123/25 £3.60

               
6-32 3/4 19.05 5 MF-BH124 £0.85

25 MF-BH124/25 £3.60

               
6-32 1 25.4 5 MF-BH125 £1.00

25 MF-BH125/25 £4.00

               
6-32 1 1/4 31.75 5 MF-BH126 £1.00

25 MF-BH126/25 £4.00

               
Driving Tools for 6 - 32 UNC Socket Button Head Screws
               
2.0mm Hex/Allen Key MF-HK-20 £0.50

2.0mm Hex/Ball Driver MF-BD-20 £2.75

             
             
8 UNC              
           
8-32 3/8 9.5 5 MF-BH131 £0.85

25 MF-BH131/25 £3.60

               
8-32 1/2 12.7 5 MF-BH132 £0.85

25 MF-BH132/25 £3.60

     
8-32 5/8 15.9 5 MF-BH133 £0.85

25 MF-BH133/25 £3.60

               
8-32 3/4 19.05 5 MF-BH135 £0.85

25 MF-BH135/25 £3.60

             
8-32 1 25.4 5 MF-BH136 £0.95

25 MF-BH136/25 £3.80

               
Driving Tools for 8 - 32 UNC Socket Button Head Screws
               
2.4mm (3/32) Hex/Allen Key MF-HK-24 £0.60

2.4mm (3/32") Hex/Ball Driver MF-BD-66 £3.25

2.4mm (3/32") T Handle Driver MF-TH-332 £4.95

               
               
10 UNC              
           
10-24 3/8 9.5 5 MF-BH141 £0.85

25 MF-BH141/25 £3.60

               
10-24  1/2 12.7 5 MF-BH142 £0.85

25 MF-BH142/25 £3.60

               
10-24 3/4 19.05 5 MF-BH143 £0.85

25 MF-BH143/25 £3.60

               
10-24  1 25.4 5 MF-BH144 £0.95

25 MF-BH144/25 £3.80

             
10-24  1 1/4 31.75 5 MF-BH145 £0.95

25 MF-BH145/25 £3.80

               
10-24  1 1/2 38.1 5 MF-BH146 £0.95

25 MF-BH146/25 £3.80

               
Driving Tools for 10 - 24 UNC Socket Button Head Screws
               
3.2mm (1/8") Hex/Allen Key MF-HK-32 £0.60

3.2mm (1/8") Hex/Ball Driver MF-BD-69 £3.45

               
               
1/4" UNC              
           
1/4-20 3/8 9.5 5 MF-BH147 £1.00

25 MF-BH147/25 £4.00

               
1/4-20 1/2 12.7 5 MF-BH148 £1.00

25 MF-BH148/25 £4.00

               
1/4-20 3/4 19.05 5 MF-BH149 £1.15

25 MF-BH149/25 £4.60

               
1/4-20 1 25.4 5 MF-BH150 £1.25

25 MF-BH150/25 £5.00

               
Driving Tools for 1/4 - 20 UNC Socket Button Head Screws
               
4.0mm Hex/Allen Key MF-HK-40 £0.60

4.0mm Hex/Ball Driver MF-BD-40 £3.45

4.0mm T Handle Driver MF-TH-40 £5.95

4mm Swivel Wrench MF-BSHW4 £7.40

               

* Metric dimensions have been converted from inch dimensions

 

For UNC nuts - click here

For flat and spring washers - click here

We do not stock specific UNC washers, but the following metric equivalents can be used for general applications :-

UNC / UNF Screw size 2 3 4 5 6 8 10 1/4
Suitable Metric Washer Size M2 M2.5 M3 M3 M3.5 M4 M5 M6

 

 

This page was last modified on : October 12, 2023

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