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Side and end view of a 4-fluted countersink. The fluted countersink cutter is used to provide a heavy chamfer in the entrance to a drilled hole. 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 ...
ISO 898 is an international standard that defines mechanical and physical properties for metric fasteners.This standard is the origin for other standards that define properties for similar metric fasteners, such as SAE J1199 and ASTM F568M. [1]
Slotted countersunk head screws (with countersunk heads as specified in ISO 2009-1972) Withdrawn: DIN EN ISO 2009: ISO 2009: DIN 964: Slotted raised countersunk oval head screws: Withdrawn: DIN EN ISO 2010: ISO 2010: DIN 965: Cross recessed countersunk flat head screws: Withdrawn: DIN EN ISO 7046-1, DIN EN ISO 7046-2: ISO 7046-1, ISO 7046-2 ...
The number series of machine screws has been extended downward to include #00-90 (0.047 in = 0.060 in − 0.013 in) and #000-120 (0.034 in = 0.060 in − 2 × 0.013 in) screws; [3] however, the main standard for screws smaller than #0 is ANSI/ASME standard B1.10 Unified Miniature Screw Threads. This defines a series of metric screws named after ...
It defines mechanical properties for sizes M12–36. [ 2 ] This is a standard set by the standards organization ASTM International , a voluntary standards development organizations that sets technical standards for materials, products, systems, and services.
A metric ISO screw thread is designated by the letter M followed by the value of the nominal diameter D (the maximum thread diameter) and the pitch P, both expressed in millimetres and separated by a dash or sometimes the multiplication sign, × (e.g. M8-1.25 or M8×1.25).