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2. Countersink - Wikipedia

   en.wikipedia.org/wiki/Countersink

   This may be required to allow the correct seating for a countersunk-head screw or to provide the lead in for a second machining operation such as tapping. 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°.

3. Glossary of prestressed concrete terms - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_prestressed...

   anchor recess A formwork blockout or recess former fitted to the edge formwork of a post-tensioned concrete member, and that creates a temporary void space external to the prestressing anchor to allow the anchor block or similar to be fitted after formwork stripping. [3]: 32 anchor set See wedge set. anchorage assembly

4. List of DIN standards - Wikipedia

   en.wikipedia.org/wiki/List_of_DIN_standards

   Countersinks for countersunk head screws (except screws with DIN EN 27721 head) ... Clothing for the mining industry – men's vest with 1/4 sleeves: DIN 23345:

5. Anchor bolt - Wikipedia

   en.wikipedia.org/wiki/Anchor_bolt

   Threaded sleeves: consist of a tube with an internal thread which is anchored back into the concrete. For all the type of the cast-in-place anchors, the load-transfer mechanisms is the mechanical interlock, [3] i.e. the embedded part of the anchors in concrete transfers and the applied load (axial or shear) via bearing pressure at

6. Molly (fastener) - Wikipedia

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

   A machine screw is screwed into the sleeve, causing the anchor to bend, expand, spread and grip against the inside of the hole or behind it (in hollow contexts such as drywall over stud cavities, or hollow doors). [1] Mollies come in various diameters and grip lengths (shank lengths) for different drywall thicknesses and to support different ...

7. Self-tapping screw - Wikipedia

   en.wikipedia.org/wiki/Self-tapping_screw

   The countersunk head has a Pozidriv recess. A self-tapping screw is a screw that can tap its own hole as it is driven into the material. More narrowly, self-tapping is used only to describe a specific type of thread-cutting screw intended to produce a thread in relatively soft material or sheet materials, excluding wood screws.