Machine Screws - Cheese - Metric - A4 Stainless Steel
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.
Cheese head machine screws have large, chunky, cylindrical heads where the height of the head is usually approximately half of its diameter. With a slotted head for installation with a flat-bladed screwdriver or bit, cheese head machine screws are strong and durable.
For a similar type of machine screw that has a slightly larger diameter flat head and a slightly lower thinner profile then choose our pan slotted machine screw.
About A4 Stainless Steel Metric Thread
The most common thread type in production today. Usually specified as M then a number x another number. This signifies the thread diameter and the length of the fastener.
For example, M4 x 30 means that the major thread diameter (the external distance across the outside of the thread) is 4mm and the length is 30mm. Length is usually measured from the underside of the fastener head.
A4 Stainless is often referred to as 316 or 18/10 stainless. As in A2 above, the numbers 18/10 refer to the chromium and nickel content- 18% chromium and 10% nickel.
A4 stainless is often used in marine or chemical environments as it has greater corrosion resistance than A2.
The chemical composition of both A2 and A4 stainless steel are almost identical with the most notable differences being the higher nickel content and the addition of Molybdenum in A4. Molybdenum is a silvery white metal that is highly corrosion resistant, very ductile and has an extremely high melting point.
There can also be Titanium present in A4 stainless at the option of the manufacturer.
Typically, A4 grade stainless steel costs slightly more than A2 because of its enhanced chemical and production properties. The extra cost can be justified, however, because hardware made of A4 stainless steel is extra resistant to tarnish and corrosion, enabling it to last a very long time.
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