Heli-Coil 5528-4 1/4-28 wire insert kit
Check compatibility
5528-4 is the 1/4-28 wire insert kit. Compare the original bolt pitch to the 1/4-20 5521-4 kit before buying.
Questions before ordering
What changes between 5528-4 and 5521-4?
The repair threads share a nominal quarter-inch diameter. The 5528-4 is for 28 TPI and 5521-4 is for 20 TPI. Match the complete designation on the original fastener.