![]() ![]() Screwdriver tips are generally designated by blade thickness × width in mm, e.g. ISO 2380-1 specifies the internationally standardized shape and dimensions of the tips of screwdrivers for slotted-head screws as well as the minimum test torque the blade-to-handle connection shall withstand. Note that it is this typical chisel shape which allows 9 screwdriver sizes to drive 24 different slotted screw sizes, with the drawbacks of not fitting as closely as a hollow-ground screwdriver would, and increasing the possibility of damaging the fastener or surrounding area. ![]() Flat-blade jeweler's screwdrivers and the tips found in 1⁄ 4-inch or 6.4-millimeter drive sets are generally hollow-ground. A hollow-ground screwdriver is less likely to cam out (leave the slot due to the torque being translated into an axial force, similar to that encountered with Phillips drive but dependent only on driver blade), so more torque can be applied without damaging the screw head. The tool used to drive a slot is called a common blade, flat-blade, slot-head, flat-tip or flat-head / flathead screwdriver. For this reason, cruciform-slotted along with drives have replaced the slot drive in numerous applications. However, this design is not well-suited for installation by power tools, given that a power driver often slips out of the slot this often causes damage to the screw and surrounding material. Slot screws are also used in the restoration of antique furniture, vehicles, and equipment. The slotted screw is commonly found in existing products and installations, along with use in simple carpentry work and in applications where minimal torque is needed. Additionally, it is unique because the slot head is straightforward to manufacture, and because it can be driven by a simple handtool. This form was the first type of screw drive to be developed, and for centuries, it was the simplest and cheapest to make because it can just be sawed or filed. Slot screw drives have a single horizontal indentation (the slot) in the fastener head and is driven by a "common blade" or flat-bladed screwdriver. Standard slot screwdriver sizes (ISO 2380). The semi-deep size is designed specifically for 3/8" DR.Slotted drives Slot drive tool and screw sizes Blade width You can select the length most suitable for your working environment. Sockets are available in deep, semi-deep and standard sizes. SAE is used primarily in the United States and metric is used primarily in Europe and Asia. Both 6-point and 12-point socketsĪre measured using these two systems. In the current market, socket sizes are divided into two systems: SAE (imperial, measured in inches) and metric (measured in millimeters). Generally speaking, 3/8 inch (9.5 mm) is the most popular size in the auto repair industry. Smaller drive holesĪre suitable for confined spaces. The bigger the drive hole, the higher the torque resistance. Why use inch? Because this was developed in Great Britain during the Industrial Age.Īt the hardware store, you’ll find ratchet wrenches and other spanners with the above drive-hole sizes. The size of the drive hole is determined by usage and torque demand. ![]() For example, you’ll require a 5mm socket for a 5mm nut. S indicates the target size of the nut, which determines which socket you’ll need. For screws in deep holes, a deep socket will be your best option. The length you’ll need will be determined by your working environment. For example, you’d use a ½-inch drive socket with a ½-inch drive ratchet. These key dimensions determine the usage of this socketĭrive Hole indicates the size of the drive hole (also referred to as the "driver hole" or "square hole"), which determines the torque size of the driver tool you’ll In the diagram above, the three key dimensions of a socket are labeled as Drive Hole, L, and S.
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