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+1 (217) 579-80458FS54 STEEL SPUR H1 Listed maximum bore allows for standard keyway and setscrew. Large bores are possible and the application should be carefully reviewed. All sizes available with hardened teeth as an alteration. * Stock bores in 8 DP 40 through 144 teeth are nominal and must be re-bored. Specifications Hub Type B Pitch Diameter 6.750 Maximum Bore Hub Type 0 Stock Bore Hub Type 1 Hub Diameter Hub Type 2 Length Through Bore Hub Type 3 Weight Hub Type 4