Types of heads of bolts, screws, screws

Slotted heads of bolts, screws, screws, self-tapping screws Heads with straight slot (SL). Straight slots are used less and less due to the unclear fixation of the tool on the heads of bolts, screws, and screws.
Cross heads of Phillips self-tapping screws Heads with Phillips cross slot (PH). The cross has a large contact area and transmits a greater torque. The cross provides self-centering of the tool and allows work at a small angle. The tooth of a Phillips screwdriver has a trapezoidal shape. This leads to the appearance of an axial force that pushes out when working with the tool.
Cross heads of Pozidriv self-tapping screws Heads with an improved cross-shaped Pozidriv (PZ) slot, outwardly differ from Phillips by four additional rays. The rectangular shape of the teeth of the Pozidriv tool ensures the transmission of a greater torque and reduces the possibility of damage to the spline.
Heads of self-tapping screws with an internal hexagon Hex (HX) heads transmit more torque than slot and cross and are more compact than hex heads. Allen keys are used for fastening with a hexagonal slot.
TORX self-tapping screw heads with an internal six-point star Heads with an internal star-shaped recess for a TORX key (TX). With equal dimensions, the TORX slot withstands heavy loads compared to the internal hexagon, and the possibility of twisting is reduced to a minimum. Marking with the letter T or TX with slot number – from T1 to T100. In addition to the internal Torx slot, there is a similar external one. Its marking begins with the letter E, sizes from E4 to E24.
Heads of bolts, screws, screws, self-tapping screws TORX PLUS TORX PLUS heads differ from Torx in that the rays of the “stars” are slightly shorter and not so sharp. Marking begins with the slot number, followed by the letters IP.
Square heads Square heads.
Three-sided heads Trihedral heads.

To protect the fasteners from disassembly by unqualified personnel, a special anti-vandal fastener with a pin in the center for a special tool is used:

Phillips cross heads with a guide in the center Phillips cross heads with a guide in the center.
Square heads with a guide in the center Square heads with a guide in the center.
TORX Tamper Resistant heads with a cylindrical guide TORX Tamper Resistant (TXH) heads with a cylindrical guide in the center of the “star”.
TORX PLUS Tamper Resistant heads with a guide TORX PLUS Tamper Resistant heads are already a pentagonal “star” with a guide. The letters TS are placed after the main marking.
Heads of bolts, screws with an internal hexagon with a guide Heads of bolts, screws with an internal hexagon with a guide.