Pololu - Machine Screw: #4-40, 3/8″ Length, Phillips (25-pack)

This #4-40, pan-head screw is 3/8″ (0.375″) long. It is made from steel, is zinc-plated, and comes in packs of 25.

1/4''-20 X 3'' Stainless Phillips Oval Head Machine Screw, (25

Machine Hex Nut: #4-40 (25-pack)

Pololu 1068 - Machine Hex Nut: 4-40 (25-pack)

Screws, Phillips Head, 3/4, 4-40 (10 pack) - Proto-PIC

This #2-56, pan-head screw is 1″ long. It is made from steel, is zinc-plated, and comes in packs of 25.

Pololu - Machine Screw: #2-56, 1″ Length, Phillips (25-pack)

Pololu - Mounting Bracket for Standard-Size Servos

Pololu Blog (Page 28)

Machine screws are used with nuts or screwed directly into a threaded recepticle to fasten metal parts together Use machine screws with nuts of a

Hillman 43068 4-40 x 1-1/4-Inch Stainless Pan Phillips Machine Screw, 50-Pack,Stainless Steel

Pololu - Nuts and Screws

Zoro Select #8-32 x 2 in Combination Phillips/Slotted Truss