Kyosho 1-S33005H M3x5mm Hex Flat Head Screw 10pcs

A pack of ten M3 x 5mm flat head screws with a hex socket drive, from Kyosho's universal hardware range.

A flat head, also called countersunk, sits flush with the surface it is screwed into rather than standing proud. That is not cosmetic. On a chassis plate it means nothing catches on the ground or on another car, and on suspension components it lets parts sit against each other without a screw head holding them apart. It also means the screw must go into a countersunk hole, so a flat head is not interchangeable with a button or cap head in the same location.

The hex socket drive lets you apply real torque without rounding the head, which a cross-head fastener will do quickly once it has been in and out a few times.

At 5mm this is a short screw, used where there is little material to thread into. Using one too long is a common way to crack a part from behind.

Kyosho's numbering encodes it: flat head, M3 thread, 5mm length. This supersedes the older Kyosho number 1379. Fitment is universal across the Optima, Plazma, Inferno NEO 3.0 and MP10e, and the V-One touring range.