A distorted thread lock nut is a type of lock nut that uses a deformed section of thread to keep the nut from loosening from vibrations or rotation of the clamped item.  Center lock nuts are are distorted in the middle of the nut. This allows the nut to be started from either side.
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GRADE A, REVERSIBLE HEX LOCKNUT, ZINC CR+3 (INCH)

1/4-20 CENTER LOCK NUT ZINC
Web Price $144.06
GRADE A, REVERSIBLE HEX LOCKNUT, ZINC CR+3 (INCH)

1/4-28 CENTER LOCK NUT ZINC
Web Price $167.95
GRADE A, REVERSIBLE HEX LOCKNUT, ZINC CR+3 (INCH)

1/4-20 CENTER LOCK NUT ZINC
Web Price $7.82
GRADE A, REVERSIBLE HEX LOCKNUT, ZINC CR+3 (INCH)

1/4-28 CENTER LOCK NUT ZINC
Web Price $9.61
GRADE A, REVERSIBLE HEX LOCKNUT, ZINC CR+3 (INCH)

5/16-18 CENTER LOCK NUT ZINC
Web Price $156.00
Diameter N/A 1/4 N/A 1/4 N/A 1/4 N/A 1/4 N/A 5/16
Pitch N/A Coarse N/A Fine N/A Coarse N/A Fine N/A Coarse
Length N/A
Material N/A Carbon Steel
Finish N/A Zinc Plated
Package Quantity N/A 3500 N/A 3500 N/A 100 N/A 100 N/A 3000