The defined diameter of metric bolts is actually slightly larger than the actual diameter. Diameter: the width of the bolt shank, the bolt head is not included. The bolt dimension can also be expressed in imperial units.ġ. Sometimes, the pitch is omitted in the abbreviated format, such as M8-20, this means the bolt has a coarse thread. For example, in M8-1.0*20, the “M” means the Metric thread designation, the digit 8 refers to the Nominal diameter (in millimeters), 1.0 refers to the pitch, and 20 refers to the length.
The size of a metric bolt is specified using pitch, diameter, and length in millimeters. If in doubt, reach out to us via chat or email and we’ll assist you promptly.Metric bolts are referenced using “M” sizes, such as the M8 bolt size. It’s always great to have a sample of the fastener you’re shopping for, but that won’t always be the case. We have a wide range of fastener listings with pictures that you can use for reference. (We’ll cover them in detail in future articles.) Unified Thread Standard (Threads Per Inch)īolt And Nut Australia Thread Pitch ChartĪside from the thread pitch (metric) or count (imperial), other factors to consider when buying fasteners include: Not all metric fasteners have imperial equivalents, and vice versa. Refer to this table when cross-referencing your bolt, nut or screw. You may also encounter threaded fasteners from the UK that still use the British Standard:īritish Standard Whitworth (BSW) - Coarse threads*īritish Standard Fine (BSF) - Fine threads*īritish Association (BA) - Typically suffixed with BA United National Fine (UNF) - Fine threads*, higher TPI values Unified National Coarse (UNC) - Coarse threads*, lower TPI values
When dealing with threaded fasteners from North America, you'll refer to them in Unified Thread Standard (UTS) that use: Threads Per Inch (TPI) is the number of threads in an inch. American and British fasteners use threads per inch Thread patterns are classified as either coarse (longer) or fine (shorter) pitch. Metric fasteners are typically prefixed by an M, which makes them easily distinguishable from imperial fasteners. Thread pitch is the distance from one thread to the next (adjacent thread). It is expressed in millimetres. You have to know when you are dealing with metric or imperial fasteners. From there, you can cross-reference from the table below, which contains data diligently compiled from verified sources. When it comes to identifying fastener sizes, thread is key.
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