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2. Ice screw - Wikipedia

   en.wikipedia.org/wiki/Ice_screw

   An ice screw. Some modern screws like this one now have a handle to assist entry and removal, whereas early models did not. An ice screw is a threaded tubular screw used as a running belay or anchor by climbers on steep ice surface such as steep waterfall ice or alpine ice during ice climbing or crevasse rescue, to hold the climber in the event of a fall, and at belays as anchor points.

3. Bolt (fastener) - Wikipedia

   en.wikipedia.org/wiki/Bolt_(fastener)

   Where a fastener forms its own thread in the component being fastened, it is called a screw. [3] This is most obviously so when the thread is tapered (i.e. traditional wood screws), precluding the use of a nut, [3] or when a sheet metal screw or other thread-forming screw is used. A screw must always be turned to assemble the joint.

4. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   Sheet metal screws make excellent fasteners for attaching metal hardware to wood because the fully threaded shank provides good retention in wood. Twinfast screw: A Twinfast screw is a type of screw with two threads (i.e. a twin-start screw), so that it can be driven twice as fast as a normal (i.e. single-start) screw with the same pitch. [4]

5. Nut (hardware) - Wikipedia

   en.wikipedia.org/wiki/Nut_(hardware)

   Used on sheet metal. It permanently anchors itself to the sheet metal by swaging the surrounding material. Star nut Threadless fork star nut Part of a threadless-style headset used to attach a bicycle fork to a bicycle frame. Semi-permanently anchors itself inside the fork steerer tube. Can be mounted using a star nut setter. T-nut

6. Self-tapping screw - Wikipedia

   en.wikipedia.org/wiki/Self-tapping_screw

   Sheet metal screws (sometimes called "sheet-metal self-tappers", P–K or PK screws from the brand name Parker Kalon, the company which pioneered [7] the manufacture of, but did not invent, these screws) are a type of screw which can form a thread in thin sheet metal. Pan-head self-tapping screws are common in metal cases for electrical ...

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8. Ice climbing - Wikipedia

   en.wikipedia.org/wiki/Ice_climbing

   Ice screw. Where ice climbing is done as lead climbing (i.e. not top roping), the key tool for protection is the ice screw, a hollow metal threaded steel tube with cutting teeth on its base and a hanger eye on the opposite end. It is screwed into the ice and its stability is dependent both on the angle and quality of its placement and the ...

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