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Q:? Time
8 years 7 months ago - 8 years 7 months ago #162741
by Wilweld
'79 F100- 302c 4spd&&'81 F350- Isuzu 6BB1&&Chamberlain Industrial MK11 (6G)
Replied by Wilweld on topic Re: Q:? Time
[/quote]
FWIW.
www.baconsdozen.co.uk/tools/conversion%20charts.htm
A.F means Across Flats, and indicates the distance apart the jaws are on an open end wrench (or the parallel sides on a nut or bolt. Usually applied to spanners in imerial (inch based) sizes the smallest increments are normally 1/16 inch (for example 7/16,1/2,9/16 etc) but some smaller spanners are marked in 1/32 inch increments.Very rarely af spanners are marked in decimal instead of fractional sizes for example .50 instead of 1/2 or .75 instead of 3/4 inch etc.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.This standard was introduced as the 'new' standard around the 1940s to replace BSW and BSF etc and was supposedly phased out by the 1970's in favour of metric threads and sizes. However like whitworth and BSF,AF it is still encountered in specialised applications and many car and motorbike makers carried on using imperial fittings etc for a long time after they became supposedly obsolete. It is very common to find an older car or bike that left its maker with a mixture of imperial and metric nuts and bolts holding it together. Land Rover and other smaller,specialised car makers used a mixture of imperial fittings into the 1990's.Note also that AF allen or hex keys fit BSW or BSF hex headed socket screws.
[/quote]
****
To add to that, spanners made to fit whitworth bolts are not marked as AF, but are sized according to the thread size of the bolt. So a spanner marked 5/16W fits a whitworth bolt with a thread size of 5/16" and is similar in size to a 5/8AF.
Then they changed all the withworth head sizes during WW2, making them one size smaller to save material. Meaning a 5/16W spanner now fits 3/8 BSW/BSF.
Hence the reason they invented the shfting spanner
Grant.
FWIW.
www.baconsdozen.co.uk/tools/conversion%20charts.htm
A.F means Across Flats, and indicates the distance apart the jaws are on an open end wrench (or the parallel sides on a nut or bolt. Usually applied to spanners in imerial (inch based) sizes the smallest increments are normally 1/16 inch (for example 7/16,1/2,9/16 etc) but some smaller spanners are marked in 1/32 inch increments.Very rarely af spanners are marked in decimal instead of fractional sizes for example .50 instead of 1/2 or .75 instead of 3/4 inch etc.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.This standard was introduced as the 'new' standard around the 1940s to replace BSW and BSF etc and was supposedly phased out by the 1970's in favour of metric threads and sizes. However like whitworth and BSF,AF it is still encountered in specialised applications and many car and motorbike makers carried on using imperial fittings etc for a long time after they became supposedly obsolete. It is very common to find an older car or bike that left its maker with a mixture of imperial and metric nuts and bolts holding it together. Land Rover and other smaller,specialised car makers used a mixture of imperial fittings into the 1990's.Note also that AF allen or hex keys fit BSW or BSF hex headed socket screws.
[/quote]
****
To add to that, spanners made to fit whitworth bolts are not marked as AF, but are sized according to the thread size of the bolt. So a spanner marked 5/16W fits a whitworth bolt with a thread size of 5/16" and is similar in size to a 5/8AF.
Then they changed all the withworth head sizes during WW2, making them one size smaller to save material. Meaning a 5/16W spanner now fits 3/8 BSW/BSF.
Hence the reason they invented the shfting spanner
Grant.
'79 F100- 302c 4spd&&'81 F350- Isuzu 6BB1&&Chamberlain Industrial MK11 (6G)
Last edit: 8 years 7 months ago by Wilweld.
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8 years 7 months ago #162745
by Swishy
OF ALL THE THINGS EYE MISS ................. EYE MISS MY MIND THE MOST
There's more WORTH in KENWORTH
Replied by Swishy on topic Re: Q:? Time
R I G H T
LOL
'V'Bus drivers logo
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cya
LOL
'V'Bus drivers logo
http://t3.gstatic.com/images?q=tbn:ANd9GcRn2-QHa4IDDGkJdw0fSYfBG94sHbvQrjKW0vIgK2G48eCzEQ89
cya
OF ALL THE THINGS EYE MISS ................. EYE MISS MY MIND THE MOST
There's more WORTH in KENWORTH
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