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Standard door handle spindle size.
It should be noted however.
You need to establish the spindle size that goes into the knob or lever and also if the center is bigger.
The modern industry standard cross section thickness size of a door handle spindle is 8mm 5 16 square.
The standard size you need to look out for is 57mm and this is the size between the lever centre or the spindle and the lock centre and thankfully that is a very popular uk size.
The majority of spindles are 9 32 square.
Spindles and followers were not always standardized to 8mm.
A smaller portion are 5 16 square mostly for levers.
The center of a swivel spindle the part that ends up in the lock hubs may be fatter then the spindle ends.
Lever to lock size is 57mm on a typical interior locking door handle.
This size has become the standard size for modern spindles.
The standard thickness of a spindle is 7 6mm most uk latch manufacturers produce latch openings at 8mm to accommodate this.
Door handle spindle reducers are available in sizes 5mm 8mm 6mm 7mm 7mm 8mm 8 9mm and 8mm 10mm.