Champion Machine Screws 6/40 x 1/2 Nickel SKU: 226137 MODEL: BS0840 Error. try again later You've successfully joined the club $ 5 .90 pack of 20 Available on orders $50 to $1500.More info × Mitre 10 MAvailable at Mitre 10 MEGA stores. Variants Fully threaded. Features and benefits Round head. Slotted drive. Fine thread. Nickel Plated.