# What does the M stand for in bolts?

Contents

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.

## Which is bigger M8 or M10?

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
M8-1.25 5/16-18 (Smaller)
M10-1.5 3/8-16 (Smaller)
M12-1.75 1/2-13 (Larger)
M14-2.0 9/16-12 (Larger)

## What do the letters mean on bolts?

The three-letter code is the manufacturer code (for example, HKT stands for Hau Kwang Enterprises) and the numbers (if metric) or radial lines (if SAE) refer to the bolts’ strength. If there are no numbers or lines present, assume the bolt is no better than a grade 2 (low strength).

## 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 size is M3 thread?

ISO Metric Machine Screw Thread Dimensions

IT IS INTERESTING:  What is the purpose of a grounding screw?
M3 3.0 0.50
M3.5 3.5 0.60
M4 4.0 0.70
M4.5 4.5 0.75

## What does SFC stand for on a bolt?

Safety Critical Fastener Products. SFC Dubai, along with its associate company SFC Europe, is a supplier of high-integrity, safety critical fastener products to the oil, gas, power generation, petrochemical and heavy engineering industries.

Grade 8 bolts have been hardened more than grade 5 bolts. Thus they are stronger and are used in demanding applications such as automotive suspensions.

## What does 8.8 on a bolt mean?

A property class (PC) is the metric equivalent of a grade in inch series terminology. … So, in English, a PC 8.8 bolt is a bolt with a nominal tensile strength of 800 MPa and a nominal yield strength that is 80% of the bolt’s nominal tensile strength, or 640 MPa.

## What is meant by m8x1 25 thread?

M means metric. 8 means 8mm nominal diameter (the thread will be less than 8 mm at the widest point) X 1.25 means 1.25 mm per thread (thanks the standard coarse pitch for this thread)

## What are standard screw sizes?

The main difference between 10-32 and 12-24 threads is their dimensions. 10-32 screws have a diameter of 3/16″ (4.8mm) where as 12-24 screws have a diameter of 7/32″ (5.6mm). M6 threads are 6mm in diameter, only . 4 mm larger than 12-24 screws.

## What does M10x1 5 mean?

Understanding Inch & Metric Thread Callouts

For example, an M10x1. 5 (coarse) thread has a 1.5mm pitch, while an M10x1. 25 (fine) thread has a 1.25mm pitch. … For example, the thread “M10” automatically means a coarse pitch, while any added pitch callout, such as M10x1. 25, specifies a non-coarse pitch.

IT IS INTERESTING:  What is the largest diameter sheet metal screw?