What is AF spanner size?

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 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 spanners the same as imperial?

And while there are a few ‘same size’ spanners, they are limited – 5/16 AF = 8mm, 3/8 Whit = 18mm, as well as the 3/4 AF = 17mm already noted. Properly speaking, Whitworth is Imperial, ie related to the Empire, but the term is regularly misused to mean ‘non-metric’. Hope this helps.

What is the difference between Whitworth and AF spanners?

The size of the bolt head also increases proportionally. The ‘sizes’ of Whitworth spanners refers to the diameter of the threaded stud, and not the bolt head itself: it is not an AF system. The difference in measurement refers to the fact that the threaded section is thicker.

What spanner size is M8?

Metric Spanner Sizes

Nominal Size Spanner Size
M6 10mm
M7 11mm
M8 13mm
M10 17mm

Is UNF the same as AF?

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.

What is BSF spanner?

The size marked on a Whitworth or B.S.F (British Standard Fine) spanner refers to the size in inches of the threaded portion on the bolt it fits. Both Whitworth and British Standard Fine were phased out by the 1960s,but some manufacturers carried on using both on applications much later than this.

What size is a 5’8 spanner?

Imperial and Metric Spanner Sizes

3/8 INCH 9/16 INCH 14.29 MM
7/16 INCH 5/8 INCH 15.88 MM
11/16 INCH 17.46 MM
1/2 INCH 3/4 INCH 19.05 MM

Is AF thread the same as UNF?

Imperial AF spanners are normally used on nuts and bolts threaded UNC or UNF (Unified Coarse or Unified Fine) and use a thread angle of 60 degrees. They are used on metric threaded fastenings,these have a thread angle of 60 degrees. Metric bolts often have two numbers on the heads,this is a strength rating.

What is a AF socket?

What is af 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.

Does M8 mean 8mm?

Hole Sizes for Metric Bolts The defined diameter of metric bolts is actually slightly larger than the actual diameter of the bolt shaft. So an M8 bolt would have a shaft diameter that’s slightly under 8mm which means that the bolt should fit through an 8mm hole.

What does AF stand for on a spanner?

When you see a spanner marked AF, it stands for Across Flats but is actually an Imperial size inscription or more specifically an SAE marking which is associated with UNF and UNC screw threads. For instance, a 1/2 inch AF spanner means it is a ½ inch across and can fit in a 5/17 inch UNF nut’s diameter.

What kind of spanners are used in aircraft?

Spanners – album – was created on 1995-04-25. What are Whitworth spanners? They are a range of spanners (wrenches) used mainly in the British aircraft industry in the 1930’s to the 1960’s. Explain chrome vanadium and chrome alloy spanners?

When do you need an AF spanner for a car?

It is important to note that many vehicles manufactured in the period reaching the mid-1970’s use bolts that require AF sockets or AF spanners while those that were manufactured later use mainly metric spanners.

What kind of fittings are in a mm, AF, BSW Spanner?

MM, AF, BSW, BSF Spanner Conversion Chart If your classic was built – or at least designed – before 1960, there is a strong chance it will contain a combination of Imperial AF and Whitworth bolts and fixings. If it’s Continental, metric fittings will be the standard.