please tell the size of the centre hole across +how are you measurng castors, my castors are 10mm aprox on the metal shaft across +50mm wheel2wheel tx

Unless speciality castors, this will take the standard 10mm castors pins

Is the whole base made of aluminium, I had problems with polypropylene braking where the wheels fit

Yes. Solid cast Aluminium. Im 6ft and 18st and had this for about 3 years. still going strong. Will outlast the chair.

Is this chair base " one hundred per cent aluminium" ?

It is certainly an all metal casting which I believe is aluminium. Very pleased with it used it to replace a swivel/reclining chair that had 5 wooden legs. Needed to machine a metal tube to join to chair worked well

What is the diameter of the central hole, please?

Sorry no idea, but fits the standard gas lifter on most chairs. I have used this to replace two different chair bases.

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⚡ Upgrade your office throne with Charles Jacobs – where durability meets style!

PRECISION DIMENSIONS - 25-inch diameter and 7.5cm height clearance for optimal balance and comfort.
LIGHTWEIGHT YET DURABLE - Only 2.25kg, combining portability with heavy-duty resilience.
UNIVERSAL COMPATIBILITY - Designed for all standard 11mm diameter castor wheels and 50mm gas lifts—effortless upgrades guaranteed.
EFFORTLESS CHAIR REVIVAL - Perfect for quick, stylish repairs that outshine generic bases.
ROBUST ALUMINIUM STRENGTH - Engineered to support up to 200kg with a sleek, modern finish.

The Charles Jacobs 25" Aluminium 5 Spoke Star Office Chair Base is a premium replacement base crafted from heavy-duty aluminium, designed to fit standard 11mm castors and 50mm gas lifts. With a 25-inch diameter and a max weight capacity of 200kg, it offers a modern, durable solution for enhancing or repairing office chairs, perfect for home or light office use.

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Surface recommendation	Hard Floor
Item dimensions L x W x H	63 x 63 x 7.5 centimetres
Manufacturer	Charles Jacobs
Product Dimensions	63 x 63 x 7.5 cm; 2.25 kg
Is assembly required	Yes
Assembly type	Already Assembled
Primary material	Aluminium
Type of wood	Aluminium
Finish type	Aluminium
Style	Modern
What is in the box?	chair
Item shape	irregular shape
Care Instructions	Wipe Clean
Seat height	26 Inches
Number of boxes	1
Shipping weight	3 Kilograms
Item Model Number	5060468575675
Item model number	5060468575675
ASIN	B0796WJQWL

Charles Jacobs 25" Aluminium 5 Spoke Replacement Office Chair Base

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