Question: What is AF spanner size?

What does AF mean in spanner size?

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 is 22mm in AF?

Wrench Size And Conversion Table

Inches Millimeters Spanner
0.866 22mm 22mm
0.875 7/8 AF
0.905 23mm 23mm
0.920 1/2 Wworth; 9/16 BSF

Is af the same as 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.

Are AF and UNF the same?

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.

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What does AF 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 is a 19mm wrench in standard?

Metric / Standard Wrench Conversion Chart

Bolt Diameter Metric Standard
1/2″ 19mm 3/4″
9/16″ 21mm 13/16″
22mm 7/8″
5/8″ 24mm 15/16″

What is a 7mm wrench in standard?

SAE to Metric Conversion Chart

SAE Metric Inch
6.5mm 0.256
7mm 0.276
9/32″ 0.281
5/16″ 0.313

Is AF metric or imperial?

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.

What are imperial spanner sizes?

Imperial and Metric Spanner Sizes

BOLT DIAMETER (INCHES) AF SPANNER SIZE (INCHES) SPANNER SIZE (MM)
1/4 INCH 7/16 INCH 11.11 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

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.

What is M2 screw?

M2 screws are typically used in the manufacture of small items of electrical equipment, laptops, cameras and mobile phones. The “M” designation for metric screws indicates the outer diameter of the screw in millimetres, so for an M2 screw, the outer diameter is 2mm.

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What size is an M4 screw?

The M4 machine screw has a thread diameter of 4 millimetres, in simple terms the M stands for millimetres followed by the size – in this case 4 mm.

How do you measure spanner size?

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).