## What is HWH fastener?

Indent Hex Washer Head Self Tapping Screw with EPDM/rubber Bonded Steel Washer. Bonded sealing washers are generally used in plumbing and other water-related applications because of their neoprene seal that helps to prevent leaks. They are also used in metal building projects with sheet metal screws.

## What does HWH mean in screws?

HWH: Hex Washer Slotted Head Screw.

What does the M stand for on bolts?

Taking a closer look at this description, let’s explore its meaning: M = This designates the fastener is a metric size. 10 = The nominal diameter in millimeters. 1.0 = The thread pitch, or distance between threads, in millimeters. 20 = The fastener’s length, in millimeters.

### What does 8.8 on a bolt mean?

The grade 8.8 refers to the tensile strength which is generally 116,000 psi, grade 10.9 is generally 150,000 and grade 12.9 is generally 175,000 psi. One may also ask, how strong is a grade 8.8 bolt?

### Is M10 the same as 10mm?

If the size is M10 x 25, that would mean that the diameter is 10 mm. Since there is no thread pitch listed, the fastener is assumed to have a coarse thread. The 25 indicated a length of 25 mm. A matching nut would be labeled M10, which also doesn’t require a thread pitch since it’s a course thread fastener.

What size is an 8.8 screw?

Metric hex bolts, Zinc plated class 8.8 steel, 8mm x 1.0mm x 60mm.

## Is Grade 8 the strongest bolt?

A grade 8 bolt is the highest grade SAE bolt. Grade 8 bolts have a minimum tensile strength of 150,000 PSI. As a comparison, the ASTM A325 bolt is roughly equivalent to the SAE grade 5. A grade 8 bolt would be one that meets ASTM A490 standards.

## What does M mean in screw sizes?

metric
The standard metric rack screw is called M6 x 1. The ‘M’ means it’s metric. The ‘6’ is the outside diameter measured in millimeters, and the ‘1’ is the distance between adjacent threads, also in millimeters. Metric threads are used outside of the USA, and commonly in products by HP and other global entities.