Bremick Metric Button Head Socket Screw, M3, 6mm

A button head socket screw has a low, domed head with a socket drive, so it is turned with a key or bit instead of a spanner. There are 52 Bremick metric button head socket screw items (metric thread, Grade 12.9, alloy steel, plain finish): sizes M3 to M12, lengths 6mm to 50mm.

The pitch shown for each size is the coarse pitch. Check the pitch of your nut or tapped hole. Class 12.9 as alloy steel, quenched and tempered, for metric sizes M6 to M48. Strength figures are the table's class minimums, shown for M6 and above only, because the table does not cover the smaller sizes. Treat them as the class minimum, not a test result for the screw. Check the key size against a screw in hand.

Where this product is used

• Low-profile fixing where a smooth rounded head is wanted, such as guards, covers and panels
• Light-duty fixing where the taller head of a cap screw would be in the way
• Replacing button head screws of the same thread form, diameter and length
• Dry indoor machinery, tooling and equipment
• Heavy-duty, high-load assemblies in machinery and equipment
• The 52 items cover diameters from M3 to M12 and lengths from 6mm to 50mm

Features

• 52 items: M3 to M12
• Metric thread, button head socket screw
• Grade 12.9, alloy steel, plain finish
• Pack quantity shown for each item
• Minimum tensile strength per size, M6 and above
• Plain finish: suited to dry indoor, oiled, painted or enclosed use
• Class 12.9 alloy steel for heavy-duty, high-load work

Key specifications

Choosing the finish

Plain (uncoated) steel has no corrosion protection beyond a light oil film, and it rusts quickly once moisture reaches it.

Keep plain parts for dry indoor use, machinery and assemblies that get painted, oiled or enclosed. Outdoors or in damp areas, a hot dip galvanised or 316 stainless alternative is the better choice.

In tooling and machine building, plain alloy socket screws are the usual choice, where the assemblies are usually oiled or enclosed.

What the grade means

Property class 12.9 is an alloy steel class for heavy-duty, high-load fixing, and the minimum tensile strength for each size is given.

Fasteners are not lifting rated unless marked.

Choosing the right option

Choose the thread form first: the screw must match its nut or tapped hole in thread form, diameter and pitch. Metric sizes are the nominal diameter in millimetres; compare the pitch with your thread. By convention the length of a socket head cap or button head screw is measured from under the head. Check the key size against a screw in hand.

See also: Bremick Metric Socket Set (Grub) Screw, Alloy Steel, Plain, M3 to M20, Bremick BSW Socket Head Cap Screw, Alloy Steel, Plain, 3/16" to 3/4", Bremick Metric Flat Round Washer, Mild Steel, Plain, M6 to M56.