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2. Trapezoidal thread form - Wikipedia

   en.wikipedia.org/wiki/Trapezoidal_thread_form

   The original trapezoidal thread form, and still probably the one most commonly encountered worldwide, with a 29° thread angle, is the Acme thread form (/ ˈ æ k m iː / AK-mee). The Acme thread was developed in 1894 as a profile well suited to power screws that has various advantages over the square thread , [ note 1 ] which had been the form ...

3. Lewis (lifting appliance) - Wikipedia

   en.wikipedia.org/wiki/Lewis_(lifting_appliance)

   It is made from three pieces of rectangular-section 13 mm (0.51 in)-thick steel legs held together with a shackle, allowing connection to a lifting hook. The middle leg is square throughout its length, while the outer legs are thinner at the top, flaring towards the bottom. Held together, the three legs thus form a dovetail shape.

4. Stem (bicycle part) - Wikipedia

   en.wikipedia.org/wiki/Stem_(bicycle_part)

   A threadless stem should match the outside diameter of the steerer tube; a reducing shim may be employed to match a 28.6 mm (1 + 1 ⁄ 8 in) stem to a 25.4 mm (1 in) steerer tube. On the other hand, a quill stem must be sized to match the inner diameter of the steerer tube.

5. Caster - Wikipedia

   en.wikipedia.org/wiki/Caster

   A swivel caster. A caster (or castor) is an undriven wheel that is designed to be attached to the bottom of a larger object (the "vehicle") to enable that object to be moved. Casters are used in numerous applications, including shopping carts, office chairs, toy wagons, hospital beds, and material handling equipment. High capacity, heavy duty ...

6. Caster angle - Wikipedia

   en.wikipedia.org/wiki/Caster_angle

   Caster displacement moves the steering axis ahead of the axis of wheel rotation, as with the front wheels of a shopping cart. Caster angle moves the steering axis from vertical. [3] In automobile racing, the caster angle may be adjusted to optimize handling characteristics for a particular venue. This is all connected to the front wheels.

7. Continuous casting - Wikipedia

   en.wikipedia.org/wiki/Continuous_casting

   Slab casters tend to cast sections that are much wider than thick: Conventional slabs lie in the range 100–1600 mm wide by 180–250 mm thick and up to 12 m long with conventional casting speeds of up to 1.4 m/minute; however slab widths and casting speeds are currently increasing. Wider slabs are available up to 3250×150 mm