J-System Bzk-bout DIN912 8.8 BL M6 x 25

The bolt is suitable for metal connections where you want a compact, neat fastening. Because you tighten the bolt with a hex key, you can also use it in places where an open-end or ring spanner does not fit easily.

What does DIN 912 and strength class 8.8 mean?

DIN 912 is the standard for socket head cap screws with hex socket. The designation 8.8 indicates the strength class, a commonly used class for general machine and construction fasteners. Black screws have a treated surface, which gives them a sleek look. Note that black is not the same as stainless steel: for use in a humid environment, a different finish may be a better choice.

How do you choose the right M6x25 socket head cap screw?

First check the diameter and the length. For a socket head cap screw, measure the length from the underside of the head to the tip of the screw. Also check whether the connection requires a socket head screw, for example because the head must be countersunk or sit flush. If you need a different size, search the category metal bolts and socket head cap screws by diameter and length.

Suitable tools and accessories

For tightening you need a hex key or hex bit of the correct size. A well-fitting tool prevents damage to the socket. For the connection, use matching nuts or threaded holes with M6 thread, and washers if needed to distribute the pressure.

Frequently asked questions

What does M6x25 mean for a bolt?

M6 is the metric thread with a diameter of 6 mm, and 25 is the length of the shank in millimetres.

What is the difference between a socket head cap screw and a hex bolt?

A socket head cap screw has a cylindrical head with a hexagonal recess that you tighten with a hex key. A hex bolt has a hexagonal head that you tighten with a spanner or ring spanner.

Can I find other sizes of socket head cap screws at Proffix?

Yes, in the category metal bolts and socket head cap screws you will find more sizes and variants. If something is not in the webshop, you can make an enquiry by phone or email.