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UNC Cap Screws

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further information

 

 
You are here - Home > Fixings > Socket Screws > UNC Steel Cap Screws

On this page you will find our range of No 1, 2, No 3, No 4, No 5,No 6, No 8, No 10  and 1/4" UNC high tensile strength steel socket cap screws.

UNC and UNF threads are designated with a size ref followed by the threads per inch

i.e. 2-56 = No 2 size with 56 threads per inch
4-40 = No 4 size with 40 threads per inch

For more data on UNC, UNF and many other types of thread - please click here

To go to our UNF range, please click here.

Looking for 0-80? This is a UNF size and listed here

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.
Tools and ancillary items such as nuts and washers for each size are now also listed at the bottom of each size section.

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

Alternatively,

Please click here

Many other sizes are available, so if the size you need is not listed then please e mail us for a quotation via the fixings enquiry page.

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 'Back' button on your browser, or the continue shopping button on the order form - the order form will retain the information until you are ready to submit your order.

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

UNC screw lengths are primarily sized in inches, but metric equivalents are given (to 2 decimal places).

Please scroll down this page to the thread size you require, or click on the links below

1 UNC
(1-64)
  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 UN
(10-24)
  1/4 UNC
(1/4-20)

All prices include 20% VAT  Click here for details

UNC Socket Cap Screws
High Tensile Steel
Black Finish

                   
1 UNC Please scroll down to the bottom of this 1 UNC
section for related tools and ancillary items
Thread

Overall Length

Thread Length
TL
(Approx)

Socket
size
 

Pack
Qty

MF Ref

Pack
Price

You can enter/change the number of items on the order form

Inches mm Inches mm A/F
Where L and TL values are equal, the shank
is fully threaded
mm
                   
1-64 1/4 6.35 1/4 6.35 5 MF-SC204 £0.95

25 MF-SC204/25 £4.25

                   
1-64 5/16 7.94 5/16 7.94 5 MF-SC205 £0.95

25 MF-SC205/25 £4.25

                   
1-64  3/8 9.53 3/8 9.53 5 MF-SC206 £0.95

25 MF-SC206/25 £4.25

                   
Driving Tools for 1 - 64 UNC Socket Cap Screws
1.6mm Hex/Allen Key   MF-HK-16 £0.60

1.6mm Hex/Ball Driver   MF-BD-62 £2.75

                   
2 UNC Please scroll down to the bottom of this 2 UNC
section for for related ancillaries and tools
Thread

Overall Length

Thread Length
TL
(Approx)

Socket size 

Pack
Qty

MF Ref

Pack
Price

You can enter/change the number of items on the order form

Inches mm Inches mm A/F
Where L and TL values are equal, the shank
is fully threaded
mm
                   
2-56 1/8 3.18 1/8 3.18 5 MF-SC220 £0.95

25 MF-SC220/25 £4.25

                   
2-56 3/16 4.76 3/16 4.76 5 MF-SC221 £0.95

25 MF-SC221/25 £4.25

                   
2-56 1/4 6.35 1/4 6.35 5 MF-SC222 £0.95

25 MF-SC222/25 £4.25

                   
2-56 3/8 9.53 3/8 9.53 5 MF-SC223 £0.95

25 MF-SC223/25 £4.25

                   
2-56 1/2 12.7 1/2 12.7 5 MF-SC224 £0.95

25 MF-SC224/25 £4.25

                   
2-56 5/8 15.9 5/8 15.9 5 MF-SC229 £1.05

25 MF-SC229/25 £4.70

                 
2-56 3/4 19 3/4 19 5 MF-SC225 £1.25

25 MF-SC225/25 £5.65

                   
2-56 1 25.4 3/4 19 5 MF-SC226 £1.90

25 MF-SC226/25 £8.55

                   
  Sorry - this item is temporarily out of stock  
2-56 1 1/4 32 1/2 12.7 2 MF-SC227 £1.90

10 MF-SC227/10 £8.55

                   
  Sorry - this item is temporarily out of stock  
2-56 1 1/2 38 1/2 12.7 2 MF-SC228 £1.90

10 MF-SC228/10 £8.55

                   
Driving Tools for 2 - 56 UNC Socket Cap Screws
2.0mm Hex/Allen Key   MF-HK-20 £0.50

2mm Hex/Ball Driver   MF-BD-20 £2.75

2mm T Handle Driver   MF-TH-20 £4.95

Popular ancillary items often ordered with 2 UNC Steel Socket Cap Screws

  Description Pack
Qty
Pack Price

 

    Description Pack
Qty
Pack Price  

2UNC Steel
BZP Hex Nuts
10 £0.60

 

*M2 St Steel
Flat Washers
20 £0.80

2UNC Steel
BZP Nyloc Nuts
10 £0.70

  *M2 St Steel
Spring Washers
20 £0.40

                     
To see our full range of nuts and/or order
larger quantities, please click here
  To see our full range of washers and/or order
larger quantities, please click here
            *M2 washers are suitable for use with 2 UNC screws
                 
3 UNC Please scroll down to the bottom of this 3 UNC
section for related tools and ancillary items
Thread

Overall Length

Thread Length
TL
(Approx)

Socket
size
 

Pack
Qty

MF Ref

Pack
Price

You can enter/change the number of items on the order form

Inches mm Inches mm A/F
Where L and TL values are equal, the shank
is fully threaded
mm
3-48 3/16 4.76 3/16 4.76 5 MF-SC271 £1.00

25 MF-SC271/25 £4.00

                   
3-48 1/4 6.35 1/4 6.35 5 MF-SC272 £1.00

25 MF-SC272/25 £4.00

                   
3-48 3/8 9.53 3/8 9.53 5 MF-SC273 £1.00

25 MF-SC273/25 £4.00

                   
3-48 1/2 12.7 1/2 12.7 5 MF-SC274 £1.00

25 MF-SC274/25 £4.00

                   
3-48 5/8 15.8 1/2 12.7 5 MF-SC277 £1.00

25 MF-SC277/25 £4.00

                 
  Sorry - this item is temporarily out of stock      
3-48 3/4 19 3/4 19 5 MF-SC275 £1.00

25 MF-SC275/25 £4.00

                   
3-48 1 25.4 3/4 19 5 MF-SC276 £1.00

25 MF-SC276/25 £4.00

                   
Driving Tools for 3 - 48 UNC Socket Cap Screws
2.0mm Hex/Allen Key   MF-HK-20 £0.50

2mm Hex/Ball Driver   MF-BD-20 £2.75

2mm T Handle Driver   MF-TH-20 £4.95

                   

Popular ancillary items often ordered with 3 UNC Steel Socket Cap Screws

  Description Pack
Qty
Pack Price

 

    Description Pack
Qty
Pack Price  

3 UNC Steel BZP
Hex Nuts
10 £1.00

 

M2.5* Steel BZP
Flat Washers
20 £0.60

3 UNC Steel BZP
Nyloc Nuts
10 £1.00

  M2.5* Steel BZP
Spring Washers
20 £0.50

                     
To see our full range of nuts and/or order
larger quantities, please click
here
  To see our full range of washers and/or order
larger quantities, please click
here
            *M2.5 washers are suitable for use with 3 UNC screws

 

4 UNC Please scroll down to the bottom of this 4 UNC
section for for related ancillaries and tools
Thread

Overall Length

Thread Length
TL
(Approx)

Socket size 

Pack
Qty

MF Ref

Pack
Price

You can enter/change the number of items on the order form

Inches mm Inches mm A/F
Where L and TL values are equal, the shank
is fully threaded
mm
4-40 1/4 6.35 1/4 6.35 5 MF-SC230 £0.85

25 MF-SC230/25 £3.50

                   
4-40 3/8 9.53 3/8 9.53 5 MF-SC231 £0.85

25 MF-SC231/25 £3.50

                   
4-40 1/2 12.7 1/2 12.7 5 MF-SC232 £0.85

25 MF-SC232/25 £3.50

                   
4-40 5/8 15.88 5/8 15.88 5 MF-SC233 £0.85

25 MF-SC233/25 £3.50

                 
4-40 3/4 19 3/4 19 5 MF-SC234 £0.85

25 MF-SC234/25 £3.50

                   
4-40 1 25.4 3/4 19 5 MF-SC235 £0.85

25 MF-SC235/25 £3.50

                   
4-40
(2mm socket version)
1 25.4 3/4 19 5 MF-SC235SH £0.85

25 MF-SC235SH/25 £3.50

                   
4-40 1 1/4 31.8 1 25.4 5 MF-SC236 £1.25

25 MF-SC236/25 £5.00

                   
4-40 1 1/2 38.1 3/4 19 5 MF-SC237 £1.35

25 MF-SC237/25 £5.50

                 
4-40 1 3/4 44.5 3/4 19 2 MF-SC239 £1.00

10 MF-SC239/10 £4.00

                   
4-40 2 50.8 3/4 19 2 MF-SC238 £1.50

10 MF-SC238/10 £6.10

                   
Driving Tools for 4 - 40 UNC Socket Cap Screws (for 2mm A/F socket versions use tools from 3 unc above)
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

Popular ancillary items often ordered with 4 UNC Steel Socket Cap Screws

  Description Pack
Qty
Pack Price

 

    Description Pack
Qty
Pack Price  

4UNC Steel
BZP Hex Nuts
10 £0.60

 

*M3 Steel BZP
Flat Washers
20 £0.60

4UNC Steel
BZP Nyloc Nuts
10 £0.70

  *M3 Steel BZP
Spring Washers
20 £0.50

                     
To see our full range of nuts and/or order
larger quantities, please click here
  To see our full range of washers and/or order
larger quantities, please click here
            *M3 washers are suitable for use with 4 UNC screws
               
5 UNC Please scroll down to the bottom of this 5 UNC
section for related tools and ancillary items
Thread

Overall Length

Thread Length
TL
(Approx)

Socket
size
 

Pack
Qty

MF Ref

Pack
Price

You can enter/change the number of items on the order form

Inches mm Inches mm A/F
Where L and TL values are equal, the shank
is fully threaded
mm
5-40 1/4 6.35 1/4 6.35 5 MF-SC260 £1.00

5-40 3/8 9.53 3/8 9.53 5 MF-SC261 £1.20

5-40 1/2 12.7 1/2 12.7 5 MF-SC262 £1.40

5-40 5/8 15.9 5/8 15.9 5 MF-SC263 £1.40

5-40 3/4 19 3/4 19 5 MF-SC264 £1.50

5-40 1 25.4 1 25.4 5 MF-SC265 £1.60

5-40 1 1/4 31.8 3/4 19 5 MF-SC266 £1.60

5-40 1 1/2 38.1 3/4 19 5 MF-SC267 £1.70

  Sorry - this item is temporarily out of stock  
5-40 1 3/4 44.5 1 25.4 5 MF-SC268 £1.80

5-40 2 50.8 3/4 19 5 MF-SC269 £1.80

                   
Driving Tools for 5 - 40 UNC Socket Cap 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

Popular ancillary items often ordered with 5 UNC Steel Socket Cap Screws

  Description Pack
Qty
Pack Price

 

    Description Pack
Qty
Pack Price  

5 UNC Steel BZP
Hex Nuts
10 £1.30

 

M3* Steel BZP
Flat Washers
20 £0.60

5 UNC Steel BZP
Nyloc Nuts
10 £1.30

  M3* Steel BZP
Spring Washers
20 £0.50

                     
To see our full range of nuts and/or order
larger quantities, please click
here
  To see our full range of washers and/or order
larger quantities, please click
here
            *M3 washers are suitable for use with 5 UNC screws
                 
6 UNC Please scroll down to the bottom of this 6 UNC
section for for related ancillaries and tools
Thread

Overall Length

Thread Length
TL
(Approx)

Socket size 

Pack
Qty

MF Ref

Pack
Price

You can enter/change the number of items on the order form

Inches mm Inches mm A/F
Where L and TL values are equal, the shank
is fully threaded
mm
6-32 1/4 6.35 1/4 6.35 5 MF-SC240 £0.85

25 MF-SC240/25 £3.50

                   
6-32 3/8 9.53 3/8 9.53 5 MF-SC241 £0.85

25 MF-SC241/25 £3.50

                   
6-32 1/2 12.7 1/2 12.7 5 MF-SC242 £0.85

25 MF-SC242/25 £3.50

                   
6-32 5/8 15.88 5/8 15.88 5 MF-SC243 £0.85

25 MF-SC243/25 £3.50

                   
6-32 3/4 19 3/4 19 5 MF-SC244 £0.85

25 MF-SC244/25 £3.50

   
6-32 1 25.4 1 25.4 5 MF-SC245 £0.85

25 MF-SC245/25 £3.50

       
6-32 1 1/4 31.8 7/8 22.2 5 MF-SC246 £1.00

25 MF-SC246/25 £4.00

                   
6-32 1 1/2 38.1 7/8 22.2 5 MF-SC247 £1.15

25 MF-SC247/25 £4.50

                   
6-32 2 50.8 1 25.4 2 MF-SC248 £1.15

10 MF-SC248/10 £4.50

   
Sorry - this item is temporarily out of stock  
6-32 2 1/4 57.1 1 25.4 2 MF-SC249 £1.30

10 MF-SC249/10 £5.10

               
6-32 2 1/2 63.5 1 25.4 2 MF-SC250 £1.55

10 MF-SC250/10 £6.60

   
6-32 3 76.2 1 25.4 2 MF-SC251 £1.90

10 MF-SC251/10 £7.50

                   
Driving Tools for 6 - 32 UNC Socket Cap Screws
2.8mm (7/64") Hex/Allen Key   MF-HK-28 £0.60

2.8mm (7/64") Hex/Ball Driver   MF-BD-68 £3.45

2.8mm (7/64") T Handle Driver   MF-TH-764 £4.95

Popular ancillary items often ordered with 6 UNC Steel Socket Cap Screws

  Description Pack
Qty
Pack Price

 

    Description Pack
Qty
Pack
Price
 

6UNC Steel
BZP Hex Nuts
10 £0.60

 

*M3.5 St/Steel
Flat Washers
20 £0.80

6UNC Steel
BZP Nyloc Nuts
10 £0.70

  *M3.5 St/Steel
Spring Washers
20 £0.50

                     
To see our full range of nuts and/or order
larger quantities, please click here
  To see our full range of washers and/or order
larger quantities, please click here
            *M3.5 washers are suitable for use with 6 UNC screws
               
8 UNC Please scroll down to the bottom of this 8 UNC
section for related tools and ancillary items
Thread

Overall Length

Thread Length
TL
(Approx)

Socket
size
 

Pack
Qty

MF Ref

Pack
Price

You can enter/change the number of items on the order form

Inches mm Inches mm A/F
Where L and TL values are equal, the shank
is fully threaded
mm
8-32 1/4 6.35 1/4 6.35 5 MF-SC814 £0.85

8-32 3/8 9.5 3/8 9.5 5 MF-SC838 £0.85

8-32 1/2 12.7 1/2 12.7 5 MF-SC252 £0.85

8-32 5/8 15.9 5/8 15.9 5 MF-SC253 £0.85

8-32 3/4 19 3/4 19 5 MF-SC254 £0.85

8-32 1 25.4 1 25.4 5 MF-SC255 £0.85

8-32 1 1/4 31.8 1 25.4 5 MF-SC256 £0.85

8-32 1 1/2 38 1 25.4 5 MF-SC257 £0.85

8-32 2 50.8 1 25.4 5 MF-SC258 £1.40

8-32 2 1/2 63.5 1 25.4 5 MF-SC259 £2.00

8-32 3 76 1 25.4 5 MF-SC259-2 £2.25

                   
Driving Tools for 8 - 32 UNC Socket Cap Screws
3.6mm (9/64") Hex/Allen Key   MF-HK-36 £0.60

3.6mm (9/64") Hex/Ball Driver   MF-BD-70 £3.45

3.6mm (9/64") T Handle Driver   MF-TH-964 £4.95

Popular ancillary items often ordered with 8 UNC Steel Socket Cap Screws

  Description Pack
Qty
Pack Price

 

    Description Pack
Qty
Pack Price  

8 UNC Steel BZP
Hex Nuts
10 £0.70

 

M4* Steel BZP
Flat Washers
20 £0.60

8 UNC Steel BZP
Nyloc Nuts
10 £0.80

  M4* Steel BZP
Spring Washers
20 £0.50

                     
To see our full range of nuts and/or order
larger quantities, please click
here
  To see our full range of washers and/or order
larger quantities, please click
here
            *M4 washers are suitable for use with 8 UNC screws

10 UNC Please scroll down to the bottom of this 10 UNC
section for for related ancillaries and tools
Thread

Overall Length

Thread Length
TL
(Approx)

Socket size 

Pack
Qty

MF Ref

Pack
Price

You can enter/change the number of items on the order form

Inches mm Inches mm A/F
Where L and TL values are equal, the shank
is fully threaded
mm
10-24 1/2 12.7 1/2 12.7

5 MF-SC210 £0.85

10-24 3/4 19 3/4 19 5 MF-SC211 £0.85

10-24 1 25.4 1 25.4 5 MF-SC213 £0.85

10-24 1 1/2 38.1 1 1/8 28.5 2 MF-SC215 £0.85

10-24 2 50.8 1 1/8 28.5 2 MF-SC217 £1.00

10-24 2 1/4 57.1 1 1/8 28.5 2 MF-SC218 £1.00

                   
Driving Tools for 10 - 24 UNC Socket Cap Screws
4mm (5/32") Hex/Allen Key   MF-HK-40 £0.60

4mm (5/32") Hex/Ball Driver   MF-BD-72 £3.65

4mm (5/32") T Handle Driver   MF-TH-532 £4.95

4mm Swivel Wrench   MF-BSHW4 £8.25

Popular ancillary items often ordered with 10 UNC Steel Socket Cap Screws

  Description Pack
Qty
Pack Price

 

    Description Pack
Qty
Pack
Price
 

10UNC Steel
BZP Hex Nuts
10 £0.70

 

*M5 St/Steel
Flat Washers
20 £0.60

10UNC Steel
BZP Nyloc Nuts
10 £0.80

  *M5 St/Steel
Spring Washers
20 £0.60

                     
To see our full range of nuts and/or order
larger quantities, please click here
  To see our full range of washers and/or order
larger quantities, please click here
            *M5 washers are suitable for use with 10 UNC screws
               
1/4" UNC Please scroll down to the bottom of this 1/4" UNC
section for related tools and ancillary items
Thread

Overall Length

Thread Length
TL
(Approx)

Socket
size
 

Pack
Qty

MF Ref

Pack
Price

You can enter/change the number of items on the order form

Inches mm Inches mm A/F
Where L and TL values are equal, the shank
is fully threaded
mm
1/4"-20 3/8 9.5 3/8 9.5 4 MF-SC286 £0.95

1/4"-20 1/2 12.7 1/2 12.7 4 MF-SC287 £0.95

1/4"-20 3/4 19 3/4 19 4 MF-SC289 £0.95

1/4"-20 1 25.4 1 25.4 4 MF-SC291 £0.95

1/4"-20 1 1/4 31.8 1 1/4 31.8 4 MF-SC292 £0.95

1/4"-20 1 1/2 38.1 1 25.4 4 MF-SC293 £0.95

1/4"-20 2 50.8 1 25.4 4 MF-SC295 £1.15

1/4"-20 2 1/4 57.1 1 25.4 4 MF-SC296 £1.15

1/4"-20 2 1/2 63.5 1 25.4 4 MF-SC297 £1.25

1/4"-20 2 3/4 70 1 25.4 4 MF-SC298 £1.25

                   
Driving Tools for 1/4 - 20 UNC Socket Cap Screws
4.75mm (3/16") Hex/Allen Key   MF-HK-475 £0.60

4.75mm (3/16") T Handle Driver   MF-TH-316 £5.65

Popular ancillary items often ordered with 1/4 UNC Steel Socket Cap Screws

  Description Pack
Qty
Pack Price

 

    Description Pack
Qty
Pack Price  

1/4 UNC Steel BZP
Hex Nuts
10 £0.80

 

M6* Steel BZP
Flat Washers
20 £0.60

1/4 UNC Steel BZP
Nyloc Nuts
10 £1.00

  M6* Steel BZP
Spring Washers
20 £0.60

                     
To see our full range of nuts and/or order
larger quantities, please click
here
  To see our full range of washers and/or order
larger quantities, please click
here
            *M6 washers are suitable for use with 1/4 UNC screws

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 : April 15, 2024

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