Abstract: A method for manufacturing a multi-functional fastener includes a preparing operation, a forming operation and a threading operation. The preparing operation prepares a metal blank cut from a length of a metal material. The forming operation is executed so that the metal blank forms a shank, a head, and a drilling portion connected to the shank. The threading operation is executed to roll the metal blank with a thread rolling set having two opposite rolling plates. Each rolling plate has slit grooves and convex units arranged in alternation. Each of the convex units has protrusions each situated between two adjacent slit grooves, which allows the threading operation to equip the shank of the metal blank with thread convolutions, slots formed between the thread convolutions for helping quick removal of chips, and main ribs formed between any two adjacent slots for increasing cutting efficiency.

Abstract: A screw includes a threaded shank and a head with a first surface. Communicating sockets formed in the first surface include a Pozi-type socket and a drive socket. The drive socket includes rounded portions, arched portions alternating with the rounded portions, and a conical portion connected to the rounded portions and the arched portions to define a first reference line and a second reference line parallel to a central axis of the head. The rounded portions are inclined outwardly from the first reference line, and the arched portions are inclined outwardly from the second reference line. Thus, a first room enclosed by the rounded portions and the arched portions increases gradually towards the first surface. By a combination of the above sockets, the head cooperates with different driving tools for delivering driving force efficiently and is more convenient to use.

Abstract: A screw includes a shank with an outer periphery, a head connected to the shank, and thread convolutions spiraling around the shank in a right-hand direction. The outer periphery defines opposite first and second peripheral envelope surfaces. A cutting slot unit is formed on the shank and arranged on the first peripheral envelope surface. The cutting slot unit includes a first cutting slot with two first edges and a second cutting slot with two second edges. The first edge extends in an extension direction opposite to the right-hand direction. One first edge of the first cutting slot is parallel to one second edge of the second cutting slot. The opposite extension of the cutting slot unit assists the screw in screwing quickly, attains quick removal of chips, and increases the fastening effect by pressing chips downwards.

Abstract: A method for manufacturing a multi-functional fastener includes a preparing operation, a forming operation and a threading operation. The preparing operation prepares a metal blank cut from a length of a metal material. The forming operation is executed so that the metal blank forms a shank, a head, and a drilling portion connected to the shank. The threading operation is executed to roll the metal blank with a thread rolling set having two opposite rolling plates. Each rolling plate has slit grooves and convex units arranged in alternation. Each of the convex units has protrusions each situated between two adjacent slit grooves, which allows the threading operation to equip the shank of the metal blank with thread convolutions, slots formed between the thread convolutions for helping quick removal of chips, and main ribs formed between any two adjacent slots for increasing cutting efficiency.

Abstract: A quick fastening screw includes a head, a shank with spirally-disposed thread convolutions, and a drilling portion. Each thread convolution has at least three flank sections and at least three arc sections each formed between any two adjacent flank sections. Two ends of each arc section and the flank sections adjacent to the arc section are respectively intersected to thereby form two joints. Between the two joints is formed a curved cutting portion which forms a radian not more than a quarter of a maximum thread radius so that each curved cutting portion becomes sharp to cut quickly, speed up a screwing operation, decrease the friction between the thread convolutions and a workpiece, and reduce the resistance and torque. The non-circular thread convolutions also receive cut debris efficiently and prevent the cracking of the workpiece caused by the undue accumulation of the debris.

Abstract: A screw includes a threaded shank and a head with a first surface. Communicating sockets formed in the first surface include a Pozi-type socket and a drive socket. The drive socket includes rounded portions, arched portions alternating with the rounded portions, and a conical portion connected to the rounded portions and the arched portions to define a first reference line and a second reference line parallel to a central axis of the head. The rounded portions are inclined outwardly from the first reference line, and the arched portions are inclined outwardly from the second reference line. Thus, a first room enclosed by the rounded portions and the arched portions increases gradually towards the first surface. By a combination of the above sockets, the head cooperates with different driving tools for delivering driving force efficiently and is more convenient to use.

Abstract: A screw includes a shank with an outer periphery, a head connected to the shank, and thread convolutions spiraling around the shank in a right-hand direction. The outer periphery defines opposite first and second peripheral envelope surfaces. A cutting slot unit is formed on the shank and arranged on the first peripheral envelope surface. The cutting slot unit includes a first cutting slot with two first edges and a second cutting slot with two second edges. The first edge extends in an extension direction opposite to the right-hand direction. One first edge of the first cutting slot is parallel to one second edge of the second cutting slot . The opposite extension of the cutting slot unit assists the screw in screwing quickly, attains quick removal of chips, and increases the fastening effect by pressing chips downwards.

Abstract: A quick fastening screw includes a head, a shank with spirally-disposed thread convolutions, and a drilling portion. Each thread convolution has at least three flank sections and at least three arc sections each formed between any two adjacent flank sections. Two ends of each arc section and the flank sections adjacent to the arc section are respectively intersected to thereby form two joints. Between the two joints is formed a curved cutting portion which forms a radian not more than a quarter of a maximum thread radius so that each curved cutting portion becomes sharp to cut quickly, speed up a screwing operation, decrease the friction between the thread convolutions and a workpiece, and reduce the resistance and torque. The non-circular thread convolutions also receive cut debris efficiently and prevent the cracking of the workpiece caused by the undue accumulation of the debris.

Abstract: A screw includes a head having a top surface where a drive socket and drive regions are recessedly formed. Each drive region has two non-parallel side walls and two different drive walls. One drive wall is connected to the side walls to form a groove communicating with the drive socket. The other drive wall is connected between two adjacent side walls of two adjacent grooves. At least one of the drive walls slopes downwards from the top surface at a slope of at least 1 degree. Each side wall connecting between the drive walls deviates inwards by an angle difference of at least 1 degree. The slope and the inward deviation of the walls receive a driving tool firmly to prevent a swinging problem and enhance the torque transmission. A punch adapted to form the recessed screw also facilitates a long-term production without losing the accuracy thereof.

Abstract: A fastener includes a shank defining a shank root, a head, a drilling portion and main threads. The main threads divide the shank root into recessed root sections. Each main thread with two cutting faces which converge at an edge is inclined to a shank axis by 60 to 82 degrees. At least one main lobe projects from the recessed root section and flares outward to at least a midpoint of at least one cutting face between the recessed root section and the edge of the main thread. The inclination allows the main threads to have a large rotating angle for increasing cutting and drilling efficiency. The extension of the main lobe supports the main thread to bear the drilling stress to prevent the shank and main threads from snapping and allow debris accommodation to provide a firm fastening effect.

Abstract: A recessed fastener includes a head with a top face and a drive socket, a shank extending downward from the head, and threads helically around the shank. The drive socket has a bottom and drive walls extending upward therefrom. The bottom meets the drive walls at a bottom border. The drive walls meet the top face at a top border. The bottom border and the top border have respective first and second corners. The first corners are rotatably offset relative to the second corners. A joining line is connected between each first corner and each second corner, and one drive wall formed between two adjacent joining lines is in a spiral form. The spiral drive walls leads a driving tool toward the bottom to produce an automatic downward pressing force which facilitates the close engagement, thereby obtaining a quick driving operation, an increased driving power and a labor-saving effect.

Abstract: A screw includes a head having a top surface where a drive socket and drive regions are recessedly formed. Each drive region has two non-parallel side walls and two different drive walls. One drive wall is connected to the side walls to form a groove communicating with the drive socket. The other drive wall is connected between two adjacent side walls of two adjacent grooves. At least one of the drive walls slopes downwards from the top surface at a slope of at least 1 degree. Each side wall connecting between the drive walls deviates inwards by an angle difference of at least 1 degree. The slope and the inward deviation of the walls receive a driving tool firmly to prevent a swinging problem and enhance the torque transmission. A punch adapted to form the recessed screw also facilitates a long-term production without losing the accuracy thereof.

Abstract: A fastener comprises a shank defining a shank root, a head, a drilling portion and main threads. Each of the main threads is inclined with respect to a shank axis by 60-82 degrees. At least one main lobe projects from the shank. The main lobe is extended outwards from the shank root and attached to at least one cutting face of each main thread. Accordingly, the inclining arrangement allows the main threads to have a large rotating angle at the time of drilling and increase the drilling speed. By the main lobe in connection with the main thread, the fastener attains the preferable torque and flexibility, enhances the torsion resistance and the tensile strength against the drilling stress to prevent the fastener from snapping and reduces the resonant vibratory effect caused by vibrations after the drilling action, thereby promoting a firm fastening effect.

Abstract: A screw has a convenient head, wherein an engaging concavity is defined. Said engaging concavity includes a central portion and a plurality of radial recesses disposed around and in communication with the central portion. Each radial recess has two insides with one inside parallels to the extension line and the other inside encloses an angle with the extension line, an end surface and an opening with a smaller width defined on the junction of the recesses and the centre portion.

Abstract: A screw has a convenient head, wherein an engaging concavity is defined. Said engaging concavity includes a central portion and a plurality of radial recesses disposed around and in communication with the central portion.