Allen Button Head – BHCS
Allen Button Head BHCS
The Socket Button Head Screw design is primarily used where a lower profile head is required and for aesthetical reasons.
These screws can take a lower tightening torque as compared to the DIN 912 screws. 
Flange Button Head Allen Screw 
Low profile head facilitates space saving and safety.
Torx Socket Head Cap Screw ISO14579
This is an improvement on the popular Hex Socket Head 
Cap Screw. Instead of an Allen drive, the Hexalobular drive or Torx eliminates the few shortcomings of the allen drive. Torx being a slipless drive is also able to take more tightening torque making this an extremely reliable screw option.