Hex head bolt M8x40 DIN 933, quality 8.8, galvanized (ZN)

Because the thread runs all the way up to the head, you can use the bolt both in a tapped hole and with a nut. This makes it widely applicable in construction, machine building and installation work. On this page you will find the specifications of the article, so you can check whether it suits your connection.

What does DIN 933 and grade 8.8 mean?

DIN 933 is the standard for hexagon bolts with full thread. The number 8.8 indicates the strength class and is often chosen for connections that carry loads. For critical structures, where a calculation or specification applies, always check whether this class meets the required standards.

Zinc coating and use indoors or outdoors

The zinc coating (ZN) protects the steel against corrosion and is common for fasteners intended for dry, indoor applications. When exposed to moisture, salt or an aggressive environment, a zinc coating is usually less suitable. In that case you can consider stainless steel, such as the A2 stainless steel stud bolts also available in this range.

The correct length and matching parts

When determining the length, add up the thickness of the parts being joined, any washer and the nut. After tightening, the bolt must protrude a little beyond the nut. If you need a slightly different length, the same bolt in M8x35 and M8x45 is shown among the related products.

Frequently asked questions

What is the difference between a stud bolt and a hexagon bolt with a shank?

A stud bolt such as this one has thread along its entire length. A bolt with a shank has a smooth zone under the head and thread only at the end.

Do I need a nut and washer with this bolt?

That depends on the application. In a threaded hole no nut is needed. In a through hole you use a nut, usually with a washer.

Is a galvanised bolt suitable for outdoor use?

A zinc coating provides basic protection, but for long-term outdoor use or a damp environment, a more corrosion-resistant material is often the wiser choice.