MACHINE BOLTS AND SCREWS

DIN 84 – Slotted Cheese Head Screws (Machine Screws)

DIN 84 specifies machine screws with a slotted cheese head and metric threads.
They feature a cylindrical head with a straight slot, suitable for tightening with a flat-blade screwdriver.
These screws are commonly used in mechanical, electrical, and precision engineering applications.

DIN 603 – Carriage Bolts (Round Head Square Neck Bolts)

DIN 603 defines carriage bolts with a round head and square neck, used primarily for wood-to-metal or wood-to-wood connections.
The square neck prevents the bolt from turning when tightened, providing a secure and neat fastening solution.

DIN 931 / DIN 933 – Hexagon Head Bolts / Screws

DIN 931 and DIN 933 are German standards that specify hexagon head bolts and screws with metric threads.

• DIN 931: Hexagon head bolts with partially threaded shank (only part of the bolt has threads).

• DIN 933: Hexagon head screws with fully threaded shank (thread runs the entire length of the screw).