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  2. Countersink - Wikipedia

    en.wikipedia.org/wiki/Countersink

    Countersink cutters are manufactured with six common angles, which are 60°, 82°, 90°, 100°, 110°, or 120°, with the two most common of those being 82° and 90°. Countersunk-head screws that follow the Unified Thread Standard very often have an 82° angle, and screws that follow the ISO standard very often have a 90° angle. Throughout ...

  3. List of ISO standards 3000–4999 - Wikipedia

    en.wikipedia.org/wiki/List_of_ISO_standards_3000...

    ISO 3294:2016 Parallel shank countersinks for angles 60, 90 and 120 degrees inclusive ISO 3295:1975 Narrow bandsaw blades for woodworking — Dimensions ISO 3296:1975 Textile machinery and accessories — Tubes for ring-spinning, doubling and twisting spindles, taper 1:64 [Withdrawn: replaced with ISO 368]

  4. Barrel threads - Wikipedia

    en.wikipedia.org/wiki/Barrel_threads

    60° 28.32 mm 30 degree countersink for the bolt head 1-1/16"-18 ... 60° 25.15 mm 3.8 mm depth countersink for the bolt head with a 17.9 mm diameter

  5. Drilling - Wikipedia

    en.wikipedia.org/wiki/Drilling

    When cutting brass, and other soft metals that can grab the drill bit and causes "chatter", a face of approx. 1-2 millimeters can be ground on the cutting edge to create an obtuse angle of 91 to 93 degrees. This prevents "chatter" during which the drill tears rather than cuts the metal.

  6. Counterbore - Wikipedia

    en.wikipedia.org/wiki/Counterbore

    A counterbore in a metal plate In machining , a counterbore ( symbol : ⌴ ) is a cylindrical flat-bottomed hole that enlarges another coaxial hole, or the tool used to create that feature. A counterbore hole is typically used when a fastener , such as a socket head cap screw or fillister head screw, is required to sit flush with or below the ...

  7. List of DIN standards - Wikipedia

    en.wikipedia.org/wiki/List_of_DIN_standards

    Plain bearings; bearing metal lining for thick-walled multilayer plain bearings: Active: DIN 74: Countersinks for countersunk head screws (except screws with DIN EN 27721 head) Active: DIN 76-1: Thread run-outs and thread undercuts for ISO metric threads in accordance with DIN 13-1: Active: DIN 76-2