Nominal Size: #6-40 x 1/2"
Head Diameter: 0.1905"
Head Height: 0.0935"
Threaded Length: 0.4940"
Overall Length: 0.5875"
Material: Stainless Steel
Head Style: Fillister
Thread Size: 40 (Fine)
Thread Length: Full
Hardness: 18-8
Type: Gun Screw

Bag of 10.

Firearm and Scope screws by type: