# What does M mean in screw sizes?

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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.

## What does M stand for in screws?

The “M” designation for metric screws indicates the nominal outer diameter of the screw thread, in millimetres. This is also referred to as the “major” diameter in the information below.

## What is M in nut size?

The letter ‘M’ indicates that this bolt uses a metric thread. The number ‘8’ refers to the nominal diameter of the bolt shaft in millimeters. The number 1.0 is the thread pitch of the bolt, which is the distance between threads, in millimeters. And the final figure, 20, is the length in millimeters.

## Is M6 screw bigger than M5?

The size of a metric screw or bolt is specified as diameter, pitch and length, in millimeters (millimeters is abbreviated “mm”). For nuts, size will appear as diameter and pitch.

Table 3.

Metric Closest Inch
M3.5-0.6 6-40 (Same)
M4-0.7 8-36 (Larger)
M5-0.8 10-32 (Smaller)
M6-1.0 1/4-28 (Larger)

## What does M mean on a bolt head?

Fortunately, metric bolts are marked differently than SAE bolts. An ISO metric bolt larger than 6 mm in diameter has either “ISO M” or “M” embossed on top of the head. … The number has nothing to do with the size, but does indicate the relative strength of the bolt. The higher the number, the stronger the bolt.

## What screw is 4mm?

Metric Imperial Screw Conversion Chart

Diameter (mm) Length (mm) Closest Imperial Size Gauge x Length
3.5mm 40 6 x 1 1/2
4mm 12 8 x 1/2
16 8 x 5/8
20 8 x 3/4

## How do I know what size bolt I need?

How to Measure the Size of a Bolt

1. Step 1: Measure the shank’s diameter. The shaft of the bolt is called the shank, and its diameter is the first dimension used to describe a bolt size. …
2. Step 2: Determine the thread pitch. …
3. Step 3: Measure the length of the shank. …
4. Step 6: Measure the length of the threaded portion of the bolt.

## What size is M3 screw?

ISO Metric Machine Screw Thread Dimensions

Thread Size Nominal Diameter (mm) Thread Pitch (mm)
M3 3.0 0.50
M3.5 3.5 0.60
M4 4.0 0.70
M4.5 4.5 0.75

## What socket is M8 bolt?

FLAT HEAD SOCKET CAP SCREW – METRIC

Size Head Diameter Hexagon Socket Size
M6-1.0 13.44 4.00
M8-1.25 17.92 5.00
M10-1.50 22.40 6.00
M12-1.75 26.88 8.00

## What size is M8 nut?

M8 Hexagon Nuts (DIN 934) – Marine Stainless Steel (A4) Technical Specification

Finish Natural
Nut Width A/F (J) 13mm
Nut Width A/P (P) 14.95mm
Thread Size M8 (8mm)
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## What is M6 screw size?

The outside diameter of the threads is 6 mm. The standard metric rack screw is actually an M6 x 0.1 mm. The number 0.1 mm refers to 0.1 threads per millimeter. You can identify an M6 screw by measuring the diameter at slightly more than 7/32″ (0.228″).

## Is M4 screw 4mm?

At the threaded bit, an M4 would be 4mm across. … It’s a bit more accurate than that, everything from the diameter of the bolt without the thread to the shape of the thread is defined to a tolerance.