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Washers of standard metric sizes equivalent to BS4320 Form A are listed in the table below. Measurements in the table refer to the dimensions of the washers as described by the drawing. Specifications for standard metric flat washers were known as DIN 125 (withdrawn) and replaced with ISO 7089.
DIN 125-1: Product grade A washers – with a hardness up to 250 HV designed for use with hexagon head bolts and nuts: Withdrawn: DIN EN ISO 7089, DIN EN ISO 7090: ISO 7089, ISO 7090: DIN 125-2: Product grade A washers – with a hardness up to 300 HV designed for use with hexagon head bolts and nuts: Withdrawn: DIN EN ISO 7089, DIN EN ISO 7090 ...
Download as PDF; Printable version; ... 125 139.7 5 6 150 168.3 5 ISO 7 (Pressure Tight threads) ... ISO 7-1:1994 Dimensions, tolerances and designation ...
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).
Download QR code; Print/export Download as PDF; Printable version; In other projects ... ISO inch screw threads—Basic dimensions: V Thread Form 51386 DIN 40400:
The metric standard used the same thread geometry as the USS standard but differed in that the dimensions and pitch were based on metric units. In 1906, the A.L.A.M developed what would be the SAE thread standard for threaded fasteners based on the USS standard but with a finer thread pitch. [6] [7]
Belleville washer. A Belleville washer, also known as a coned-disc spring, [1] conical spring washer, [2] disc spring, Belleville spring or cupped spring washer, is a conical shell which can be loaded along its axis either statically or dynamically. A Belleville washer is a type of spring shaped like a washer.
Dimensions of a square thread form. The square thread form is a common screw thread profile, used in high load applications such as leadscrews and jackscrews. It gets its name from the square cross-section of the thread. [1] It is the lowest friction and most efficient thread form, but it is difficult to fabricate.