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2. Width across flats - Wikipedia

   en.wikipedia.org/wiki/Width_across_flats

   The two systems are in general not compatible, which can result in rounding of nuts and bolts (i.e. using a 13 mm (0.51 in) spanner in place of a 1 ⁄ 2 inch (12.70 mm)). A few sizes are close enough to interchange for most purposes, such as 19 mm (close to 3 ⁄ 4 inch (19.05 mm)), 8 mm (close to 5 ⁄ 16 inch (7.94 mm)) and 4 mm (close to 5 ...

3. British Standard Whitworth - Wikipedia

   en.wikipedia.org/wiki/British_Standard_Whitworth

   4 Spanner (Wrench) size. ... 1 + 3 ⁄ 4: 2.760 70.1 ... British Morris and MG engines from 1923 to 1955 were built using metric threads with bolt heads and nuts ...

4. British Association screw threads - Wikipedia

   en.wikipedia.org/wiki/British_Association_screw...

   The pitch of 0BA is 1 mm and the pitch of each higher numbered thread is obtained by multiplying the pitch of the lower number by 0.9 so K-BA has a pitch of p = 0.9 K [4]: 12 rounded to two significant figures in mm. The major diameter is given by 6p 1.2, [4]: 12 rounded to two significant figures in mm and the hex head size (across the flats ...

5. Adjustable spanner - Wikipedia

   en.wikipedia.org/wiki/Adjustable_spanner

   An adjustable spanner (UK and most other English-speaking countries), also called a shifting spanner (Australia and New Zealand) [1] or adjustable wrench (US and Canada), [a] is any of various styles of spanner (wrench) with a movable jaw, allowing it to be used with different sizes of fastener head (nut, bolt, etc.) rather than just one fastener size, as with a conventional fixed spanner.

6. Podger spanner - Wikipedia

   en.wikipedia.org/wiki/Podger_spanner

   Some podgers are fitted with reversible ratchet sockets for tightening/loosening nuts. Often they come with two sizes such as a 17 mm × 19 mm or a 19 mm × 24 mm and a 27 mm × 30 mm. Often a podger has a hole in the wrench shaft that is used to tether the wrench to the person for safety and securing the tool whilst working at heights.

7. List of drill and tap sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

   The 85% and 90% rules works best in the range of 1 ⁄ 4 –1 in (6.4–25.4 mm), the sizes most important on many shop floors. Some sizes outside that range have different ratios. Some sizes outside that range have different ratios.