Key, 4x40 mm 

Key, 4x40 mm
Part Number: 3288
Weight: 0.01 lb

Price: $0.76

In stock
Key, 4x40 mm

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

Item No Models
84  Grizzly G0463 Grizzly Small Mill
Harbor Freight 93885 Central Machinery Small Mill
Various X3-US SIEG Small Mill
Woodstock International M1110 Shop Fox Small Mill
Click your model to see the complete parts list.