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 Omnium because Omniums are dumb.

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