FREQUENTLY ASKED QUESTIONS

Some of the frequently asked question we get asked are presented below:

10.9 Grade is 25% stronger which makes it more suitable for heavy duty application where strength performance is critical.

Fasteners are measured by diameter, length, and thread count. Diameter is how wide the shaft of the screw is.

Diameter is usually measured outside the thread. Thread count is measured by TPI (thread per inch). The smaller the fastener

the finer the thread. The length of a fastener is measured by its shank generally, the head is excluded. In the case of

countersunk fasteners, the length is measured from the head including the shank.

Measuring a bolt

M10- Diameter in mm, 33- Length of bolt in mm, 1.25- Thread pitch

Measuring a countersunk screw

DIN931 Hex Head is a Thread Bolt

DIN933 Hex Head is a Thread Bolt

The majority of fasteners have head marking with the manufactures logo on them plus the bolt strength i.e. 8.8/10.9/12.9 {A2} {A4}

Steel Fasteners:

Steel fasteners are commonly available in 4 grades.

Stainless Steel & Aluminum:

These materials are inherently resistant to corrosion. The strength of stainless is much less than alloy steel, and even less so

for aluminum.

Bronze and Brass:

Bronze has high corrosion resistance quality. It is suitable for aquatic applications, such as underwater construction.

Brass is somewhat similar to bronze in its anti-corrosive properties, but with slightly lower tensile strength because it

is comparatively softer.

Black Oxide:

This provides very low protection against corrosion and usually coated with an oil film for extra protection.

Hot-Dipped Galvanized:

After stainless steel, this provides the best protection for outdoor use.