Notorious 2.25mm tool steel

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https://www.drill-service.co.uk/products/drills/drill-blanks/blk-hss-drill-blanks/
Has #43 to plus 2.5 for hub pins if ya want to make them longer

https://www.accu.co.uk/en/ and this place for all nuts and bolts, got alot of 12.9 hardened to and ya normal 10.9 counter sink cap heads dome ect quick delivery great service and cost pence. Model shops are such a rip of for them

Just remember that metric flathead screws use 90 degree countersink whereas imperial uses 82 degrees.
 
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