What does AF stand for on spanners?

Width across flats is the distance between two parallel surfaces on the head of a screw or bolt, or a nut, mostly for torque transmission by positive locking. The term width across flats (AF) is used for the following forms: 2-socket = round material with two surfaces. 4-socket = profile square section.

What does AF spanners mean?

AF can stand for American Fractional; another term used for imperial. However, when applied to metric sockets, AF means ‘Across Flats’. This means a 19mm AF socket will fit a nut or bolt head that measures 19mm across its flats.

Is AF and Whitworth the same?

AF was introduced much later and refers to Across Flats and was related to UNC(universal national coarse) and UNF(universal national fine) threads in the USA A 1/2 inch Whitworth socket is for a nut that fits on a 1/2 inch diameter thread, and is usually 1.5 times the diameter of the screwed rod across the flats of the …

What does AF mean on imperial tools?

Likewise, earlier vehicles have 18mm wheel nuts, corresponding directly to 3/8in Whitworth (BSW). The most common Imperial standard in classics built after 1960 is the ‘increments of one inch across flats’ or ‘AF’ system. A good quality AF socket set will fit the vast majority of fittings on a British classic car.

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What is the difference between AF and imperial?

Imperial are another range of sizes completely;tend to be found on older UK vehicles. Most people take imperial to be inch sizes which are AF. If you’re thinking of Whitworth then you’ll struggle to get a whit set for cheap money these days. Most AF sizes are useful for when the metric nut is rounded etc.

What is 16mm in AF?

This table is the chart for publication of information of wrench sizes in inches (US) and millimeters (metric), as well as British spanner size information.

Wrench Size And Conversion Table.

Inches Millimeters Spanner
0.625 5/8 AF
0.630 16mm 16mm
0.669 17mm 17mm
0.686 11/16 AF

What size is a 7/16 spanner?

Imperial and Metric Spanner Sizes

BOLT DIAMETER (INCHES) AF SPANNER SIZE (INCHES) SPANNER SIZE (MM)
5/16 INCH 1/2 INCH 12.7 MM
3/8 INCH 9/16 INCH 14.29 MM
7/16 INCH 5/8 INCH 15.88 MM
11/16 INCH 17.46 MM

What are the sizes of spanners?

Metric Spanner Sizes

Nominal Size Spanner Size
M10 17mm
M12 19mm
M14 22mm
M16 24MM

How do you identify Whitworth threads?

Use the Teesing thread gauge to determine the pitch or the TPI. The pitch is indicated in metric thread in millimeters. Whitworth thread is indicated in the number of threads per inch. Locate the possible TPI or pitch by matching the diameter measured with the thread tables below.

What is a f size?

A/F (measurement) Across The Flats:

This is an alternative method to that of measuring the thread size of the bolt. It is usually quoted as, for example, 7/8″ A/F.

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What does a f mean in engineering?

Engineering drawing abbreviations and symbols

Abbreviation or symbol Definition
AF across flats
AFF above finished floor
AISI American Iron and Steel Institute
Al or AL aluminium

What’s the difference between metric and imperial spanners?

A simple rule is that if the bolt has lines on its head then it’s considered imperial. If it’s got numbers on the head then it’s metric and the higher the number, the stronger the bolt. Another notable difference is that metric fasteners are coarser than their imperial counterparts.

Is AF thread the same as UNF?

AF isn’t a thread type, it’s “Across Flats” and is just a way of measuring the size of a bolt head, so UNF and UNC bolts have head sizes that are specified by measuring them Across the Flats instead of relating them to the thread size as with Whitworth and BA.

How do spanner sizes work?

Modern spanner sizes refer to the distance across the flats of the hexagonal nut or bolt they would fit. A 17mm spanner therefore fits a nut 17mm across its flats and this is normally a nut to fit a 10mm diameter bolt (M10).

When should a flare spanner be used?

Flare nut spanners can fit fasteners that are inaccessible to ring spanners, while retaining the stability provided by a ring head. They are designed for use on fasteners that are attached to tubes, for example, on the end of vehicle brake pipes or plumbing pipes.