CFS CFS Fastener Head Styles & Drive Types

Question 1

Which head style provides the largest bearing surface and is commonly used in wood and soft material applications?

Accepted Answer

Truss head

Answer

Flat head

Answer

Pan head

Answer

Hex head

Question 2

A Torx (star) drive fastener is designated by the letter 'T' followed by a number. What does the number represent?

Accepted Answer

A size code corresponding to the drive tool tip dimensions

Answer

The number of points on the star

Answer

The torque rating in inch-pounds

Answer

The screw diameter in millimeters

Question 3

Which drive type is specifically designed to provide a 'cam-out' effect to prevent overtightening on assembly lines?

Accepted Answer

Phillips

Answer

Hex socket (Allen)

Answer

Torx Plus

Answer

Square (Robertson)

Question 4

What distinguishes an oval (raised countersunk) head from a flat (countersunk) head?

Accepted Answer

Oval heads have a slightly domed top surface above the countersink bearing surface

Answer

Oval heads require a larger countersink angle

Answer

Oval heads use a different drive recess

Answer

Oval heads have a larger bearing surface diameter

Question 5

Which head style is most appropriate when a fastener must be flush with or below the work surface in a countersunk hole?

Accepted Answer

Flat (countersunk) head

Answer

Pan head

Answer

Button head

Answer

Fillister head

Question 6

A socket head cap screw uses which drive type and is typically tightened with what tool?

Accepted Answer

Internal hex (Allen) drive; hex key or hex driver

Answer

Torx drive; T-handle

Answer

Slotted drive; flathead screwdriver

Answer

Phillips drive; #2 Phillips screwdriver