What is the difference between AF and Whitworth spanners?

What is the difference between AF and Whitworth spanners?

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 is AF spanner size?

0.709 inches = 18mm (uncommonly used metric spanner size) but often used as a substitute for 3/8 inch whit.. 0.813 inches = 13/16 AF inch (Common spark plug size)….

Bolt dia.	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 does AF mean in sockets?

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.

What is an AF thread?

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 does AF mean on tools?

Across Flats

What is the difference between SAE and Whitworth?

These are both machine thread (and hex) standards based on fractional inch diameters. Whitworth is rarely used any more, while SAE is still in use, though metric hardware has become more common in most industries. Thread counts are different, hex sizes (nuts and bolt heads) are different sizes.

Is Whitworth still used?

British Standard Whitworth (BSW) Thread Form. Sir Joseph Whitworth proposed this thread in 1841. The thread form is now redundant and has been replaced by Unified and Metric threads but there are many applications in which it is still used.

Is Whitworth the same as BSP?

NPT/NPS threads have a 60° angle and have flattened peaks and valleys (Sellers thread form) where as BSP threads have a 55° angle and have rounded peaks and valleys (Whitworth thread form).

What are Whitworth tools?

The Whitworth thread was the world’s first national screw thread standard, devised and specified by Joseph Whitworth in 1841. The thread pitch increases with diameter in steps specified on a chart. The Whitworth thread system was later to be adopted as a British Standard to become British Standard Whitworth (BSW).

Is BSF the same as UNF?

BSF and BSW are Britisch measurement systems, while UNF and UNC are American measurement systems. BSF and UNF are the fine thread systems, while BSW and UNC are the coarse thread systems.

What does BSF thread mean?

British Standard Fine

Is Unc the same as Whitworth?

If you are struggling to find either a BSW thread (British Standard Whitworth) or a UNC thread (Unified National Coarse), it is useful to know that in almost all cases the two threads are interchangeable in practical terms.

Which is stronger UNC or UNF?

A 1/4 UNF thread is about 14% stronger than its UNC counterpart. The metric coarse thread is actually between UN coarse and fine thread, and the metric fine thread is finer than the UNF threads.

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 does UNC bolt mean?

Unified coarse pitch threads

Is 8 32 UNC or UNF?

UNC – Unified Coarse Threads

Major Diameter (in)	Threads per inch (tpi)	Major Diameter
		(mm)
#8 – 32	32	4.166
#10 – 24	24	4.826
#12 – 24	24	5.486

What are standard bolt threads?

US Threads Per Inch Table

Bolt Size	Threads Per Inch (TPI)
	Coarse Thread UNC	Fine Thread UNF
1/4″	20	28
5/16″	18	24
3/8″	16	24

What thread size is 6 32?

0.1380 inches

What is the next size down from 6 32?

What size is 8 32 screw?

Screw Size	Class Thread	Major Diameter
6-40	3A	0.1380
8-32	2A	0.1640
8-32	3A	0.1640
8-36	2A	0.1640