A4 Stainless Steel Countersunk Screws - Westfield Fasteners Ltd

Fastener Material Key
A2	A2 Stainless Steel - Also known as grade 304 or 18/8. A general purpose grade of stainless steel.
A4	A4 Stainless Steel - Also known as grade 316 or 18/8/3. A higher corrosion resistant, marine grade of stainless steel.

Socket Head Countersunk Screws ISO 10642 (DIN 7991) in A4 Stainless Steel

image chamfer for Socket Head Countersunk Screws ISO 10642 (DIN 7991)

Socket Head Countersunk Screws ISO 10642 (DIN 7991) in A4 Stainless Steel

A countersunk headed screw conforming with ISO 10642 or DIN 7991, requiring a hex key (otherwise known as an Allen key) to fit. The countersunk head is typically used in conjunction with a countersunk hole providing a flush, snag free fit. Generally manufactured with a full thread, though occasionally some stock may include a partially threaded shank. The head diameter is slightly larger than that of the equivalent DIN 965 Phillips or Pozi driven screw.

A4

M2.5

M3

M4

M5

M6

M8

M10

M12

M16

Slotted Countersunk Machine Screws DIN 963 in A4 Stainless Steel

image chamfer for Slotted Countersunk Machine Screws DIN 963

Slotted Countersunk Machine Screws DIN 963 in A4 Stainless Steel

A slot drive, countersunk headed screw, typically used in conjunction with a countersunk hole which provides a flush, snag free fit.

A4

M1.6

M2

M2.5

M3

M3.5

M4

M5

M6

M8

M10

M12

Torx Csk Head Screws Sim. ISO 10642 / ISO 14581 in A4 Stainless Steel

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Torx Csk Head Screws Sim. ISO 10642 / ISO 14581 in A4 Stainless Steel

Also known as star, 6 lobe, and hexalobular internal. Torx screws are commonly found on cars, motorcycles, bicycle brake systems, hard disk drives, computer systems and consumer electronics and are becoming increasingly popular. Once, they were typically used in applications requiring tamper resistance; as drivers became more common, specific tamper-resistant variants were developed. The Torx design allows for a higher torque to be exerted than a similarly sized conventional hex socket head.

A4

M2

M2.5

M3

M4

M5

M6

M8

Pozi Csk Machine Screws DIN 965 Z in A4 Stainless Steel

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Pozi Csk Machine Screws DIN 965 Z in A4 Stainless Steel

A popular machine screw with a pozi drive. The countersunk head is typically used in conjunction with a countersunk hole providing a flush, snag free fit. These items are always fully threaded. Conforms to DIN 965. Typically found on consumer electronics and other small machinery where high torque fasteners are not necessary.

A4

M2

M2.5

M3

M4

M5

M6

M8

M10

UNC Socket Head Countersunk Screws ASME B18.3-2012 in A4 Stainless Steel

image chamfer for UNC Socket Head Countersunk Screws ASME B18.3-2012

UNC Socket Head Countersunk Screws ASME B18.3-2012 in A4 Stainless Steel

A countersunk headed screw conforming with ASME/ANSI B18.3, requiring a hex key (otherwise known as an Allen key) to fit. The countersunk head is typically used in conjunction with a countersunk hole providing a flush, snag free fit. Generally manufactured with a full thread, though occasionally some stock may include a partially threaded shank.

A4

6-32

8-32

10-24

1/4

5/16

3/8

1/2

UNF Socket Head Countersunk Screws ASME B18. 3-2003 in A4 Stainless Steel

image chamfer for UNF Socket Head Countersunk Screws ASME B18. 3-2003

UNF Socket Head Countersunk Screws ASME B18. 3-2003 in A4 Stainless Steel

A countersunk headed screw conforming with ASME/ANSI B18.3, requiring a hex key (otherwise known as an Allen key) to fit. The countersunk head is typically used in conjunction with a countersunk hole providing a flush, snag free fit. Generally manufactured with a full thread, though occasionally some stock may include a partially threaded shank.

A4

10-32

1/4

Pozidrive Countersunk Chipboard Screws in A4 Stainless Steel

General purpose wood screws with a pozidriv countersunk head. The countersunk head is typically used in conjunction with a countersunk hole providing a flush, snag free fit. Standard A2 stainless steel and the marine grade A4 stainless steel are particularly good where the screw heads are visible in outdoor or in humid/wet enviroments, such as bathrooms and kitchens. Where we have part thread versions, we have listed them separately below. We also stock the stainless steel torx drive version of these wood screws. Please note that the head shape can vary between a countersunk, double countersunk, and bugle shape.

A4

3

3.5

4

4.5

5

6

Pozidrive Countersunk Chipboard Screws in A4 Stainless Steel

General purpose wood screws with a pozidriv countersunk head. The countersunk head is typically used in conjunction with a countersunk hole providing a flush, snag free fit. Standard A2 stainless steel and the marine grade A4 stainless steel are particularly good where the screw heads are visible in outdoor or in humid/wet enviroments, such as bathrooms and kitchens. Where we have part thread versions, we have listed them separately below. We also stock the stainless steel torx drive version of these wood screws. Please note that the head shape can vary between a countersunk, double countersunk, and bugle shape.

A4

3

3.5

4

4.5

5

6

Torx Countersunk Chipboard Screws in A4 Stainless Steel

General purpose wood screws with a Torx drive; also known as star, 6 lobe, and hexalobular internal. The torx drive is designed to prevent "cam out", which makes them ideal for use with modern drill/drivers. The countersunk head is typically used in conjunction with a countersunk hole providing a flush, snag free fit. Please note that the head shape can vary between a countersunk, double countersunk, and bugle shape.

A4

3

3.5

4

4.5

5

6

8

Torx Countersunk Chipboard Screws in A4 Stainless Steel

General purpose wood screws with a Torx drive; also known as star, 6 lobe, and hexalobular internal. The torx drive is designed to prevent "cam out", which makes them ideal for use with modern drill/drivers. The countersunk head is typically used in conjunction with a countersunk hole providing a flush, snag free fit. Please note that the head shape can vary between a countersunk, double countersunk, and bugle shape.

A4

3

3.5

4

4.5

5

6

8

Torx Raised Countersunk Chipboard Screws in A4 Stainless Steel

General purpose wood screws with a torx drive raised countersunk head. Raised countersunks tend to be used where the screw head is going to be seen, as it gives a more attractive look than the flat countersunk and a softer edge. A countersunk head is typically used in conjunction with a countersunk hole providing a flush, snag free fit. Please note, these screws can sometimes come with a partially threaded shank.

A4

3

3.5

4

4.5

5

6

Torx Raised Countersunk Chipboard Screws in A4 Stainless Steel

General purpose wood screws with a torx drive raised countersunk head. Raised countersunks tend to be used where the screw head is going to be seen, as it gives a more attractive look than the flat countersunk and a softer edge. A countersunk head is typically used in conjunction with a countersunk hole providing a flush, snag free fit. Please note, these screws can sometimes come with a partially threaded shank.

A4

3

3.5

4

4.5

5

6

Pin 5 Lobe Countersunk Security Screws in A4 Stainless Steel

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Pin 5 Lobe Countersunk Security Screws in A4 Stainless Steel

These attractive 5-Lobe Pin security machine screws offer an improved tamper resistance compared to the more commonly available 6-Lobe Pin drive. The tooling is therefore more specialised and harder for members of the public to get hold of. Also known as torx plus or pentalobe screws, this variant has a countersunk head. Torx and other lobed designs allows for a higher torque to be exerted than a similarly sized conventional hex socket head.

A4

M3

M4

M5

M6

M8