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2. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   Flat-blade jeweler's screwdrivers and the tips found in 1 ⁄ 4-inch or 6.4-millimeter drive sets are generally hollow-ground. Note that it is this typical chisel shape which allows 9 screwdriver sizes to drive 24 different slotted screw sizes, with the drawbacks of not fitting as closely as a hollow-ground screwdriver would, and increasing the ...

3. Punched tape - Wikipedia

   en.wikipedia.org/wiki/Punched_tape

   Tape for punching was usually 0.00394 inches (0.100 mm) thick. The two most common widths were 11 ⁄ 16 inch (17 mm) for five bit codes, and 1 inch (25 mm) for tapes with six or more bits. Hole spacing was 0.1 inches (2.5 mm) in both directions. Data holes were 0.072 inches (1.8 mm) in diameter; sprocket feed holes were 0.046 inches (1.2 mm). [8]

4. Tap and die - Wikipedia

   en.wikipedia.org/wiki/Tap_and_die

   This feature causes the tap to continuously break the chip and eject it forward into the hole, preventing crowding. Spiral point taps are usually used in holes that go all the way through the material, so that the chips can escape. Another version of the spiral point plug tap is the spiral flute tap, whose flutes resemble those of a twist drill ...

5. The best air purifiers of 2025 - AOL

   www.aol.com/lifestyle/best-air-purifiers...

   The tallest (14.4" wide x 14.4" deep x 22.7" tall) in our round-up and with a premium grey material that covers much of the cylindrical-shaped device, this air purifier can clean up to 3,048 ...

6. RML 2.5-inch mountain gun - Wikipedia

   en.wikipedia.org/wiki/RML_2.5-inch_Mountain_Gun

   Writers who refer to "7-pounders" in World War I are in fact referring to this 2.5-inch (64 mm) gun. Romania bought 36 of these guns in 1883–1884, being designated in the local military nomenclature as "63 mm Armstrong mountain guns model 1883". They were the first guns designed for mountain warfare in Romanian use.

7. Set screw - Wikipedia

   en.wikipedia.org/wiki/Set_screw

   A set screw is often headless and threaded along its entire length, so that it will sit entirely inside that hole; in which case it may be called a grub screw or blind screw. Once fully and firmly screwed into the first object, the projecting tip of the set screw presses hard against the second object, acting like a clamp .