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Hex head

Part of a series on
Screw drive types
Screw Head - Slotted.svg Slot drive
Screw head - cross.svg Cross
Screw Head - Phillips.svg Phillips
PH
Screw Head - Frearson.svg Frearson
French Recess intern (fcm).jpg French recess
Screw Head - JIS B 1012.svg JIS B 1012
Screw Head - Mortorq.svg Mortorq
Screw Head - Pozidrive.svg Pozidriv
PZ
Screw Head - Supadrive.svg Supadriv
PZ
Screw Head - Square External.svg Square
Screw Head - Robertson.svg Robertson
Screw Head - Hex External.svg Hex
Screw Head - 12-Point external.svg 12-point
Screw Head - Hex Socket.svg Hex socket (Allen)
Screw Head - Hex Socket Tamperproof.svg Security hex
Screw Head - Torx.svg Torx
T & TX
Screw Head - Torx Tamperproof.svg Security Torx
TR
Wkretaki-07 torx plus.svg Torx Plus
TR
Screw Head - TA.svg TA
Screw Head - Tri-point.svg Tri-point
Screw Head - Tri-groove.svg Tri-groove
Screw Head - Tri-wing.svg Tri-wing
Screw Head - Torq-set.svg Torq-set
Screw Head - Spanner.svg Spanner head
(pig nose)
TH
Screw Head - Clutch Type A.svg Clutch A
Screw Head - Clutch Type G.svg Clutch G
Screw Head - One-way Clutch.svg One-way
Screw Head - Double Square.svg Double-square
Screw Head - Triple Square.svg Triple-square
XZN
Screw Head - Polydrive.svg Polydrive
Screw Head - Spline.svg 12-spline flange
Screw Head - Double Hex.svg Double hex
Screw Head - Bristol.svg Bristol
Screw Head - Phillips Combo.svg Phillips/Slotted
Screw Head - Quadrex.svg Quadrex
Pentalobular.svg Pentalobe
Screw Head - Torx External.svg External Torx
Screw head - line male.svg Line head male
Screw head - line female.svg Line head female
Screw head - line female tamper.svg Line head female tamper
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A screw drive is a system used to turn a screw. At a minimum, it is a set of shaped cavities and protrusions on the screw head that allows torque to be applied to it. Usually, it also involves a mating tool, such as a screwdriver, that is used to turn it. The following heads are categorized based on commonality, with some of the less-common drives being classified as "tamper-resistant".

Most heads come in a range of sizes, typically distinguished by a number, such as "Phillips #00" or "Torx T5". These sizes do not necessarily describe a particular dimension of the drive shape, but are often arbitrary designations in the same sense as a "Size 8" dress.

The slot screw drive has a single slot in the fastener head and is driven by a "common blade" or flat-bladed screwdriver. It was the first type of screw drive to be developed, and for centuries it was the simplest and cheapest to make. The slotted screw is common in simple woodworking applications, but is not often seen in applications where a power tool would be used because a power driver tends to slip out of the head, potentially damaging the surrounding material. The tool used to drive a slot is called a common blade, standard, flat-blade, slot-head, flat-tip or flat-head / flathead screwdriver.

Coin-slot drives are so-called because of the curved bottom of the recess that facilitates driving them with a suitable coin, are often used on items where the user is not likely to have a screwdriver when needed, such as on thumb-screws that attach cameras to tripod adapters.

Hi-Torque slot drives were designed by Alcoa Fastening Systems, for situations where very high torque is needed, but cross-recessed screws are unsuitable.

Dzus (pronounced "Zeus") screws are similar to Hi-Torque screws, and are typically used in the aviation industry to secure inspection panels and other access doors that need to be opened and closed frequently, but are too small or thin to support other types of latches.

A cross or double-slot screw drive has two slots, oriented perpendicular to each other, in the fastener head; a slotted screwdriver is still used to drive just one of the slots. This type is usually found in cheaply-made roofing bolts and the like, where a thread of 5 mm (0.20 in) or above has a large flattened pan head. The sole advantage is that they provide some measure of redundancy: should one slot be deformed in service, the second may still be used.


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