Machine Design
18/8 steel contains

18% nickel and 8% vanadium
18% chromium and 8% nickel
18% nickel and 8% chromium
18% vanadium and 8% nickel

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Machine Design
Cap screws are

Similar to small size tap bolts except that a greater variety of shapes of heads are available
Slotted for a screw driver and generally used with a nut
Used to prevent relative motion between parts
Provided with detachable caps

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