Along with a large selection of door handle spindle expansion sleeves adaptors which allow a smaller spindle to be used with standard door furniture.
Standard door handle spindle size.
This size has become the standard size for modern spindles.
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The modern industry standard cross section thickness size of a door handle spindle is 8mm 5 16 square.
However we know that there are a number of latches particularly from the early 20th century that had a slightly smaller opening meaning that a 7mm spindle is required.
It should be noted however.
Spindles and followers were not always standardized to 8mm.
You need to establish the spindle size that goes into the knob or lever and also if the center is bigger.
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.
The majority of spindles are 9 32 square.
Lever to lock size is 57mm on a typical interior locking door handle.
A smaller portion are 5 16 square mostly for levers.