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Step 10212-Point Double Hex
[[br]]Double Hex is a fastener specification. It is physically similar but incompatible with triple square and spline drive fasteners. Standard hex keys are compatible as drivers for double hex screws and bolts.
From fellow instructable member lordzion: 12 Point Double Hexagon usually associated with a flange head and in high torque applications where there is a restriction on head size or when space is limited hexagon driving tools eg inside access.
An internal wrenching nut exists, known as an Allenut or Allen nut, is a cylindrical nut that is internally threaded on one side and has an Allen socket on the other side; the outside of the nut is smooth or has knurling on it.
The Allen socket may be 6 point or 12 point (also known as a double hex socket). They are used where hex or square nuts won't fit. Screw sizes from #4 to 1", body diameters from 0.187" to 1.533", heights from 0.179" to 1.532, and socket sizes from 1/8" to 1".[[br]]
From fellow instructable member lordzion: 12 Point Double Hexagon usually associated with a flange head and in high torque applications where there is a restriction on head size or when space is limited hexagon driving tools eg inside access.
An internal wrenching nut exists, known as an Allenut or Allen nut, is a cylindrical nut that is internally threaded on one side and has an Allen socket on the other side; the outside of the nut is smooth or has knurling on it.
The Allen socket may be 6 point or 12 point (also known as a double hex socket). They are used where hex or square nuts won't fit. Screw sizes from #4 to 1", body diameters from 0.187" to 1.533", heights from 0.179" to 1.532, and socket sizes from 1/8" to 1".[[br]]
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