Machine Screws - Slotted Countersunk - BA

A machine screw is a type of screw that is commonly used in industrial and manufacturing applications to secure components within engines, electronic products and general machinery.

Countersunk machine screws are designed for installation in countersunk holes to enable them to sit flush within the finished surface. This type of fastener should be installed with a flat-bladed screwdriver or bit.

They are available in zinc plated, brass and stainless-steel finishes.

About BA Thread

BA thread (British association) is a rarely used thread that was once commonly found on small instruments and models. Still sparingly used in some industries such as metering equipment manufacturing and optical equipment.

Machine Screws - Slotted Countersunk - BA
Guides & Tips

4BA x 5/8" Countersunk Slotted Machine Screw BS 57 - A2 Stainless Steel - Pack of 10

Code: MSBASCA204062

£19.93 £23.92

4BA x 3/4" Countersunk Slotted Machine Screw BS 57 - A2 Stainless Steel - Pack of 10

Code: MSBASCA204075

£21.92 £26.30

6BA x 1" - Machine Screw Countersunk Slotted BS 57 - A2 Stainless Steel - Pack of 5

Code: MSBASCA206100

£12.90 £15.48

2BA x 1" - Machine Screw Countersunk Slotted - Brass - Pack of 25

Code: MSBASCBR02100

£16.21 £19.45

4BA x 3/16" - Machine Screw Countersunk Slotted - Brass - Pack of 25

Code: MSBASCBR04018

£13.65 £16.38

4BA x 1/4" - Machine Screw Countersunk Slotted - Brass - Pack of 25

Code: MSBASCBR04025

£13.65 £16.38

5BA x 3/8" - Machine Screw Countersunk Slotted - Brass - Pack of 25

Code: MSBASCBR05037

£23.38 £28.06

6BA x 1/2" - Machine Screw Countersunk Slotted - Brass - Pack of 25

Code: MSBASCBR06050

£11.80 £14.16

6BA x 3/4" - Machine Screw Countersunk Slotted - Brass - Pack of 25

Code: MSBASCBR06075

£12.71 £15.25

6BA x 1" - Machine Screw Countersunk Slotted - Brass - Pack of 10

Code: MSBASCBR06100

£9.84 £11.81

6BA x 1 1/4" - Machine Screw Countersunk Slotted - Brass - Pack of 10

Code: MSBASCBR06125

£11.60 £13.92

6BA x 1 1/2" - Machine Screw Countersunk Slotted - Brass - Pack of 10

Code: MSBASCBR06150

£11.60 £13.92

8BA x 1/4" - Machine Screw Countersunk Slotted - Brass - Pack of 25

Code: MSBASCBR08025

£11.99 £14.39

8BA x 1" - Machine Screw Countersunk Slotted - Brass - Pack of 10

Code: MSBASCBR08100

£14.67 £17.60

0BA x 1/2" - Machine Screw Countersunk Slotted BS 57 - Self Colour - Pack of 10

Code: MSBASCSC00050

£10.66 £12.79

0BA x 7/8" - Machine Screw Countersunk Slotted BS 57 - Self Colour - Pack of 25

Code: MSBASCSC00087

£11.52 £13.82

1BA x 1" - Machine Screw Countersunk Slotted BS 57 - Self Colour - Pack of 25

Code: MSBASCSC01100

From 1 reviews

£20.25 £24.30

2BA x 5/16" - Machine Screw Countersunk Slotted BS 57 - Self Colour - Pack of 25

Code: MSBASCSC02031

£11.59 £13.91

2BA x 3/8" - Machine Screw Countersunk Slotted BS 57 - Self Colour - Pack of 25

Code: MSBASCSC02037

£13.27 £15.92

2BA x 1/2" - Machine Screw Countersunk Slotted BS 57 - Self Colour - Pack of 8

Code: MSBASCSC02050

Only 1 pack left in stock

£10.28 £12.34

2BA x 5/8" - Machine Screw Countersunk Slotted BS 57 - Self Colour - Pack of 25

Code: MSBASCSC02062

£13.54 £16.25

2BA x 7/8" - Machine Screw Countersunk Slotted BS 57 - Self Colour - Pack of 10

Code: MSBASCSC02087

£22.18 £26.62

2BA x 1 1/2" - Machine Screw Countersunk Slotted BS 57 - Self Colour - Pack of 6

Code: MSBASCSC02150

Only 1 pack left in stock

£7.77 £9.32

2BA x 1 3/4" - Machine Screw Countersunk Slotted BS 57 - Self Colour - Pack of 25

Code: MSBASCSC02175

£14.28 £17.14

2BA x 2" - Machine Screw Countersunk Slotted BS 57 - Self Colour - Pack of 25

Code: MSBASCSC02200

£14.70 £17.64

3BA x 1" - Machine Screw Countersunk Slotted BS 57 - Self Colour - Pack of 25

Code: MSBASCSC03100

£13.93 £16.72

3BA x 2" - Machine Screw Countersunk Slotted BS 57 - Self Colour - Pack of 25

Code: MSBASCSC03200

£16.47 £19.76

4BA x 3/16" - Machine Screw Countersunk Slotted BS 57 - Self Colour - Pack of 25

Code: MSBASCSC04018

£11.49 £13.79

4BA x 1/4" - Machine Screw Countersunk Slotted BS 57 - Self Colour - Pack of 25

Code: MSBASCSC04025

£11.56 £13.87

4BA x 3/8" - Machine Screw Countersunk Slotted BS 57 - Self Colour - Pack of 25

Code: MSBASCSC04037

£11.97 £14.36

4BA x 2" - Machine Screw Countersunk Slotted BS 57 - Self Colour - Pack of 25

Code: MSBASCSC04200

£13.68 £16.42

5BA x 1/4" - Machine Screw Countersunk Slotted BS 57 - Self Colour - Pack of 25

Code: MSBASCSC05025

£16.23 £19.48

6BA x 1/4" - Machine Screw Countersunk Slotted BS 57 - Self Colour - Pack of 25

Code: MSBASCSC06025

£11.57 £13.88

6BA x 5/16" - Machine Screw Countersunk Slotted BS 57 - Self Colour - Pack of 25

Code: MSBASCSC06031

£11.67 £14.00

6BA x 3/8" - Machine Screw Countersunk Slotted BS 57 - Self Colour - Pack of 50

Code: MSBASCSC06037

£11.71 £14.05

6BA x 1/2" - Machine Screw Countersunk Slotted BS 57 - Self Colour - Pack of 50

Code: MSBASCSC06050

£11.63 £13.96

6BA x 5/8" - Machine Screw Countersunk Slotted BS 57 - Self Colour - Pack of 25

Code: MSBASCSC06062

£11.67 £14.00

0BA x 3/8" - Machine Screw Countersunk Slotted BS 57 - BZP - Pack of 10

Code: MSBASCZP00037

£14.43 £17.32

0BA x 3/4" - Machine Screw Countersunk Slotted BS 57 - BZP - Pack of 10

Code: MSBASCZP00075

£11.83 £14.20

2BA x 1/4" - Machine Screw Countersunk Slotted BS 57 - BZP - Pack of 25

Code: MSBASCZP02025

£12.81 £15.37

2BA x 1/2" - Machine Screw Countersunk Slotted BS 57 - BZP - Pack of 25

Code: MSBASCZP02050

£13.71 £16.45

2BA x 3/4" - Machine Screw Countersunk Slotted BS 57 - BZP - Pack of 25

Code: MSBASCZP02075

£11.56 £13.87

2BA x 1" - Machine Screw Countersunk Slotted BS 57 - BZP - Pack of 10

Code: MSBASCZP02100

£11.13 £13.36

2BA x 1 1/4" - Machine Screw Countersunk Slotted BS 57 - BZP - Pack of 25

Code: MSBASCZP02125

£15.04 £18.05

2BA x 1 1/2" - Machine Screw Countersunk Slotted BS 57 - BZP - Pack of 25

Code: MSBASCZP02150

£16.19 £19.43

2BA x 2 1/2" - Machine Screw Countersunk Slotted BS 57 - BZP - Pack of 25

Code: MSBASCZP02250

£15.94 £19.13

4BA x 1/4" - Machine Screw Countersunk Slotted BS 57 - BZP - Pack of 25

Code: MSBASCZP04025

From 1 reviews

£11.72 £14.06

4BA x 3/8" - Machine Screw Countersunk Slotted BS 57 - BZP - Pack of 25

Code: MSBASCZP04037

£11.97 £14.36

4BA x 5/8" - Machine Screw Countersunk Slotted BS 57 - BZP - Pack of 25

Code: MSBASCZP04062

£12.26 £14.71

4BA x 1" - Machine Screw Countersunk Slotted BS 57 - BZP - Pack of 25

Code: MSBASCZP04100

£12.54 £15.05

4BA x 1 5/16" - Machine Screw Countersunk Slotted BS 57 - BZP - Pack of 25

Code: MSBASCZP04131

£12.72 £15.26

6BA x 1/2" - Machine Screw Countersunk Slotted BS 57 - BZP - Pack of 25

Code: MSBASCZP06050

£11.84 £14.21

6BA x 5/8" - Machine Screw Countersunk Slotted BS 57 - BZP - Pack of 25

Code: MSBASCZP06062

£11.75 £14.10

6BA x 3/4" - Machine Screw Countersunk Slotted BS 57 - BZP - Pack of 25

Code: MSBASCZP06075

£11.80 £14.16

8BA x 3/8" - Machine Screw Countersunk Slotted BS 57 - BZP - Pack of 25

Code: MSBASCZP08037

£11.49 £13.79

8BA x 1/2" - Machine Screw Countersunk Slotted BS 57 - BZP - Pack of 25

Code: MSBASCZP08050

£11.56 £13.87

0BA x 1 1/2" - Machine Screw Countersunk Slotted - YBZP - Pack of 5

Code: MSBASCZY00150

Only 1 pack left in stock

£9.84 £11.81

4BA x 3/8" - Machine Screw Countersunk Slotted BS 57 - YBZP - Pack of 25

Code: MSBASCZY04037

£11.46 £13.75

4BA x 7/16" - Machine Screw Countersunk Slotted BS 57 - YBZP - Pack of 25

Code: MSBASCZY04043

Only 1 pack left in stock

£12.43 £14.92

4BA x 11/16" - Machine Screw Countersunk Slotted BS 57 - YBZP - Pack of 25

Code: MSBASCZY04068

£11.51 £13.81

6BA x 5/16" - Machine Screw Countersunk Slotted BS 57 - YBZP - Pack of 25

Code: MSBASCZY06031

£11.67 £14.00

8BA x 1/4" - Machine Screw Countersunk Slotted BS 57 - YBZP - Pack of 25

Code: MSBASCZY08025

£11.80 £14.16

Machine Screws - Slotted Countersunk - BA

About BA Thread

Screws - Frequently Asked Questions

Screws - Guides & Reviews

Screws - Installation Advice