RS PRO Black, Self-Colour Steel Hex Socket Countersunk Screw, DIN 7991, M4 x 16mm

RS PRO hexagon socket countersunk screws are an excellent choice when you need a fastener to sit flush or below the surface of your material.
These popular metric thread countersunk screws are produced in 10.9 grade steel and are designed for light duty applications where space is limited. These fasteners have a black finish which ensures an attractive, quality appearance and finish wherever they are used.
These screws fasteners can be tightened or undone using an Allen key.

Various thread sizes available, including M3, M4, M5, M6, M8 and M16
Countersunk – the head does not stick out so that nothing can hit it and interfere with the operation of the application
Also used in many internal joinery applications
Have the marking on the head
More resilient than 8.8 grade
Nominal strength of 1040 N/mm²
Yield strength of 940 N/mm²
Requires a Hex key / Allen key

Although uses may vary, as standard, these screws are fasteners for industrial equipment or machines which requires parts to be fixed onto a surface or together. The socket will need to be the same metric thread as the screw itself. As an example, some of the types of uses would be:
Woodworking
Domestic applications
Fasteners and fixings
Machine tooling and repair
Security guarding
Panel Building
Electronic applications
Automotive industry
Medical applications
Facilities and maintenance applications

Socket screws are defined by their name. They are a type of threaded bolt which screws into the intended socket. There are various thread sizes and lengths and can be used for both industrial and personal purposes. Good quality and reliable RS PRO socket screws ensures the fixing will remain strong and stable, whatever the application.

Requires a Hex key
We offer a range of hexagon countersunk socket screws in black self-coloured steel, available in various thread sizes and lengths. Refer to the Datasheet and Range Overview download file for details.
If black oxide self-coloured steel is not what you are looking for we also offer steel hexagon countersunk socket screws with a BZP finish or alternatively A2 (306) and A4 (316) stainless steel.

Threaded in accordance with DIN 7991

Whenever you need a fastener for light-duty applications where there is a limitation of space, Hexagon Countersunk, metric threaded Socket Screw is a natural fit.
We are proudly introducing our own branded RS PRO 16 mm Hexagon Screw to sit flush or below the surface of your material. These screws are widely used in many applications where a reliable and robust joint is required. Typically, Countersunk socket screws are used to fasten plates and strips of metal to equipment and machinery as their flat Head allows a flush, balanced finish. Our range of Socket Screws is made of mild steel, and if painted or suitably treated, these Screws can be used outside.

Countersunk Head Socket Cap Screw comes in 10.9-grade Steel and with a black finish, creates a stylish, quality appearance to your small or big project. The threaded bolt screws into the socket and can be tightened or undone using an Allen Key or a Hex Key. They have various tip point types, which include:

• Cup Point - concave tip, most commonly used


• Flat Point - used for frequent resetting or relocating, cost-effective and straightforward


• Cone Point – pointed tip, designed for a more permanent installation, highest holding capability due to the precise contact of the cone point


• Half Dog Point – the tip is cylindrical

Although uses may vary, as standard, these Socket Screws are fasteners for industrial equipment or machines, which requires parts to be fixed onto a surface or together. The socket will need to be the same metric thread as the Screw itself.

Typical applications include:

• Machine Tooling


• Security Guarding


• Panel building and general fastening applications


• Internal joinery applications


• Woodworking


• Electric Applications


• Automotive industry


• Medical applications


• Facilities and maintenance applications

What is a Socket Screw?

Their name defines socket screws. They are a type of threaded bolt which screws into the intended socket. There are various thread sizes and lengths and can be used for both industrial and personal purposes. Good quality and reliable RS PRO socket screws ensure the fixing will remain strong and stable, whatever the application.

RS PRO is our family brand to go-to and brings you a wide range for high-quality and high-value products to support your project. Trusted by engineers all over the world, every part of every RS PRO product is always rigorously tested against demanding industry standards. We are only giving the RS PRO seal of approval if we are confident of their exceptional quality, which means you can be convinced too.

If black oxide self-coloured steel is not what you are looking for we also offer Steel Hexagon Countersunk Socket Screws with a BZP finish or alternatively A2 (306) and A4 (316) stainless steel.