Feed Screw, Y-Axis, HiTorque Bench Mill Deluxe 

Specifications

Overall Length	13.11" (333.0 mm)
Screw Length	10.47" (266.0 mm)
Shaft Length	2.05" (52.0 mm)
Screw Diameter	0.62" (15.8 mm)
Shaft Diameter	0.47" (12.0 mm)
Threading	M8

In your instruction manual, this part appears on the parts list as:

Item No	Models
C14	LittleMachineShop.com 5550 HiTorque Bench Mill Various SX2.7L-US SIEG Bench Mill LittleMachineShop.com 6550 HiTorque Bench Mill LittleMachineShop.com 6570 HiTorque Bench Mill

Click your model to see the complete parts list.