An Allen key, Allen wrench or hex key is a tool used to drive bolts and screws with hexagonal sockets in their heads.
Bolts, nuts and threaded rods - torque, tension and loads.
Engineering related topics like Beaufort Wind Scale, CE-marking, drawing standards and more.
Tensile stress and Hooke's Law.
Hardwood and softwood drill speed chart.
Distances between corners for hexagons and squares.
Dimensions of metric threads according ISO 724.
Minimum ultimate tensile and proof loads for metric bolts with coarse or fine threads.
Recommended thightening torque metric bolts.
Metric steel bolts, screws and studs - proof and tensile strength.
Recommended clearance holes and drill tap sizes.
Lubrication effect on bolt tension and torque.
Metric versus Imperial equivalent screw dimensions.
ASTM steel bolts - proof and tensile strength.
SAE steel bolts - grades ranging grade 1 to 8.2 - proof and tensile strength.
Standard metric T-slots and T-nuts.
Threaded bolts tensile stress area.
ANSI/ASME B1.1 Unified National Thread - UNC Coarse series and UNF Fine series.
Hex Bolt, Lag Bolt, Square Bolt and Heavy Hex Bolt.
ANSI/ASME B18.2.1 Dimensions of Hex Bolts - Imperial units.
ANSI/ASME B18.2.3M Dimensions of Hex Bolts - Metric units.
Machine screw diameters.
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