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## How do you tell what size a bolt head is?

To measure the diameter of screws and bolts, you measure the distance from the outer thread on one side to the outer thread on the other side. This is called the major diameter and will usually be the proper size of the bolt.

## How many mm is M8 bolt?

Standard metric spanner and allen key sizes.

Size Spanner Allen Key
M8 13 mm 6 mm
M10 17 mm 8 mm
M12 19 mm 10 mm
M16 24 mm 14 mm

## What size head does a M16 bolt have?

Dimensions for DIN931 Hex Head Bolt

Diameter (d) Pitch Head Depth (k)
M14 2mm 8.8mm
M16 2mm 10mm
M18 2.5mm 11.5mm
M20 2.5mm 12.5mm

## What is the head size of a M8 bolt?

SOCKET HEAD CAP SCREW – METRIC

M5-0.8 5.00 8.50
M6-1.0 6.00 10.00
M8-1.25 8.00 13.00
M10-1.50 10.00 16.00

## How do I choose a bolt size?

A typical rule of thumb . . . Use a bolt diameter that is 1.5 – 2.5 times (up to three times) the thickness of the thinner material you are bolting together. So, for 1/8″ material, a 1/4″ diameter is often a good bolt choice. For 1/4″ thick material, perhaps a 3/8″ or 1/2″ bolt.

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## How can you tell if a bolt is metric or standard?

Telling the difference between a metric and imperial bolt is easy. If the bolt has lines on the head its standard or imperial. If the bolt has numbers on the head then its metric.

## What size bolt has a 17mm head?

Size Chart

Bolt size Size Tolerance
M10 17mm 17.40
7/16″UNF 11/16″ 17.86
18mm 18.40
3/8″BSW 18.43

## What does M12 mean?

6. Those are metric screw dimensions. M10 means a 10 millimeter outer diameter for the bolt or whatever piece it is; M12 means 12 millimeters. The part after the ‘x’ is the pitch — how many mm a thread is wide. To figure out which you have, you can measure the existing part with calipers and a thread gauge.

## What does M12 mean on a bolt?

M12x1. 75 is the measurement code that indicates the thread size and thread pitch of a screw. The first half (M12), is the size measurement (metric) taken across the outside diameter of the thread (which in this case is 12mm).

## Is an M12 bolt 12mm?

M12 is a 12mm diameter thread. You have to be sure the thread pitch measured in threads per millimeter (1.5 here) is the same as what u need.

## What size is a M36 bolt?

Metric Hex Bolt Dimensions

NOMINAL SIZE (D) BODY DIAMETER ACROSS THE FLATS
m20 20.00 30.00
m24 24.00 36.00
m30 30.00 46.00
m36 36.00 55.00

## Is 5/16 The same as M8?

Well, quick answer is no. They are not the same and they are not interchangeable, although they can work under certain circumstances. The most important part is understanding the meaning of M8 and 5/16 to refer to the size of a metric screw or bolt, so then we can see why they aren’t the same thing!

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## Is an M8 bolt 8mm wide?

But, to answer your Q – an M8 bolt will fit in an 8mm hole. There is clearance.

## What size metric bolt has a 10mm head?

The standard 6mm cap screw has a 10mm head.