Sugino Torx-30 alloy chainring bolts w/  cro-mo steel knurled rear nuts. 6.5mm length is sized for a single chainring and perfect for your Sugino (or other) track cranks.

However, these won't work on Sram Omniums, so don't even try.

Do not exceed 6.9Nm (70kgf.cm) of torque during installation.