Comparison : Item # HFN11250XXX, Hex Flat Nut, 1-1/8" Nominal Dia.
Item # HFN12500XXX, Hex Flat Nut, 1-1/4" Nominal Dia.
Item # HFN13750XXX, Hex Flat Nut, 1-3/8" Nominal Dia.
Item # HFN15000XXX, Hex Flat Nut, 1-1/2" Nominal Dia.


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