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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).
The term fine adjustment screw typically refers to screws with threads from 40–100 TPI (Threads Per Inch) (0.5 mm to 0.2 mm pitch) and ultra fine adjustment screw has been used to refer to 100–254 TPI (0.2 mm to 0.1 mm pitch). These screws are most frequently used in applications where the screw is used to control fine motion of an object.
A typical lag screw can range in diameter from 4 to 20 mm or #10 to 1.25 in (4.83 to 31.75 mm), and lengths from 16 to 200 mm or 1 ⁄ 4 to 6 in (6.35 to 152.40 mm) or longer, with the coarse threads of a wood-screw or sheet-metal-screw threadform (but larger).
ISO general purpose metric screw threads—General plan: V Thread Form: M6x1 ISO 262:1998: ISO general purpose metric screw threads—Selected sizes for screws, bolts and nuts: V Thread Form ISO 724:1993: ISO general-purpose metric screw threads—Basic dimensions: V Thread Form ISO 725:2009: ISO inch screw threads—Basic dimensions: V Thread ...
ISO general purpose metric screw threads – Part 12: 1 to 300 mm diameter coarse and fine pitch threads Selected diameters and pitches: Active: DIN 13-13: ISO general purpose metric screw threads – Part 13: Selected sizes for screws, bolts and nuts from 1 to 52 mm screw thread diameter and limits of sizes: Active: DIN 13-19
A table of standard sizes for machine screws as provided by the American Screw Company of Providence, Rhode Island, USA, and published in a Mechanical Engineers' Handbook of 1916. Standards seen here overlap with those found elsewhere marked as ASME and SAE standards and with the later Unified Thread Standard (UTS) of 1949 and afterward.
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