Imperial, Pozi & Torx Conversion

caveman38

Try as I may. I cannot correlate between the above with regards to screw size and what bits are required. I need to know the exact bit requirement for each screw size and how they correlate to old imperial sizes eg. size 8 screws.
Assuming I want to use say size 8 woodscrews on some balustrading. what size screws and bit sizes would I use for either Torx or Pozi. I know it must be simple, but I'm struggling.

stragglebod

Pozi and Torx aren't screw sizes, they're the shapes of the bits you use to drive them.

Here's a guide to converting imperial to metric

https://www.diydoctor.org.uk/projects/screwsize.htm

caveman38

stragglebod said:

Pozi and Torx aren't screw sizes, they're the shapes of the bits you use to drive them.

Here's a guide to converting imperial to metric

https://www.diydoctor.org.uk/projects/screwsize.htm

Thanks but all that tells me is that if I once used a 1 1/2 size 8 I now need a 4mm screw. I want to know what size pozi or torx screw to use instead and what screw bit to use in the cordless screwdriver.

EssexExile

caveman38 said:

stragglebod said:

Pozi and Torx aren't screw sizes, they're the shapes of the bits you use to drive them.

Here's a guide to converting imperial to metric

https://www.diydoctor.org.uk/projects/screwsize.htm

Thanks but all that tells me is that if I once used a 1 1/2 size 8 I now need a 4mm screw. I want to know what size pozi or torx screw to use instead and what screw bit to use in the cordless screwdriver.

You use the bit that fits best. You need a set of bits to cover all the usual sizes of philips, pozi, torx, etc.

caveman38

EssexExile said:

caveman38 said:

stragglebod said:

Pozi and Torx aren't screw sizes, they're the shapes of the bits you use to drive them.

Here's a guide to converting imperial to metric

https://www.diydoctor.org.uk/projects/screwsize.htm

Thanks but all that tells me is that if I once used a 1 1/2 size 8 I now need a 4mm screw. I want to know what size pozi or torx screw to use instead and what screw bit to use in the cordless screwdriver.

You use the bit that fits best. You need a set of bits to cover all the usual sizes of philips, pozi, torx, etc.

Thanks for the advice. I know I'll never be professional at my age, but. I didn't want to just poke and hope and hoped maybe to buy the right tool and screws rather than 30 that I may need one day. Perhaps buying a good bits each time I wanted to use the driver. I just thought there would be a good guide that I could use. Thanks all the same.

williamgriffin

EssexExile said:

caveman38 said:

stragglebod said:

Pozi and Torx aren't screw sizes, they're the shapes of the bits you use to drive them.

Here's a guide to converting imperial to metric

https://www.diydoctor.org.uk/projects/screwsize.htm

Thanks but all that tells me is that if I once used a 1 1/2 size 8 I now need a 4mm screw. I want to know what size pozi or torx screw to use instead and what screw bit to use in the cordless screwdriver.

You use the bit that fits best. You need a set of bits to cover all the usual sizes of philips, pozi, torx, etc.

If it's a torx screw you'd use the bit that fits. At a guess a 4mm screw will be T20 or T25.

stuart45

Sometimes tells you on the box what to use. A lot of them of PZ2 although for frame fixings usually PZ3. Best to get the right bit, or you tend to wreck the screws and the bits. I always get a box of 25 PZ2 bits.

FreeBear

caveman38 said:  I didn't want to just poke and hope and hoped maybe to buy the right tool and screws rather than 30 that I may need one day.

Just buy a set of driver bits - Most will cover the majority of fasteners that you'll likely to come across in your lifetime.

Some boxes of screws will even come with a free driver bit (thinking trade packs of drywall screws here).

stuart45

FreeBear said:

caveman38 said:  I didn't want to just poke and hope and hoped maybe to buy the right tool and screws rather than 30 that I may need one day.

Just buy a set of driver bits - Most will cover the majority of fasteners that you'll likely to come across in your lifetime.

Some boxes of screws will even come with a free driver bit (thinking trade packs of drywall screws here).

If you have a lot of drywall to do, might be worth investing in a couple of these. For heavy handed people like me they bury the screws at the correct depth in the plasterboard, even with the impact driver.

Norman_Castle

caveman38 said:

Try as I may. I cannot correlate between the above with regards to screw size and what bits are required. I need to know the exact bit requirement for each screw size and how they correlate to old imperial sizes eg. size 8 screws.
Assuming I want to use say size 8 woodscrews on some balustrading. what size screws and bit sizes would I use for either Torx or Pozi. I know it must be simple, but I'm struggling.

  It is simple, buy a set of bits and use the one that fits properly. If you use a cordless drill as a screwdriver a basic bit set is very worthwhile.

stragglebod

caveman38 said:

EssexExile said:

caveman38 said:

stragglebod said:

Pozi and Torx aren't screw sizes, they're the shapes of the bits you use to drive them.

Here's a guide to converting imperial to metric

https://www.diydoctor.org.uk/projects/screwsize.htm

Thanks but all that tells me is that if I once used a 1 1/2 size 8 I now need a 4mm screw. I want to know what size pozi or torx screw to use instead and what screw bit to use in the cordless screwdriver.

You use the bit that fits best. You need a set of bits to cover all the usual sizes of philips, pozi, torx, etc.

Thanks for the advice. I know I'll never be professional at my age, but. I didn't want to just poke and hope and hoped maybe to buy the right tool and screws rather than 30 that I may need one day. Perhaps buying a good bits each time I wanted to use the driver. I just thought there would be a good guide that I could use. Thanks all the same.

Buy this, use the one that fits the particular screw the best, you'll probably never need to buy any more bits ever again

https://www.amazon.co.uk/Bosch-Professional-2607017464-Screwdriver-Universal/dp/B07PC5WFLY