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2. ISO metric screw thread - Wikipedia

   en.wikipedia.org/wiki/ISO_metric_screw_thread

   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). If the pitch is the normally used "coarse" pitch listed in ISO 261 or ...

3. List of thread standards - Wikipedia

   en.wikipedia.org/wiki/List_of_thread_standards

   Metric Screw Threads: M Profile: V Thread Form ASME B1.15-1995 (R2003) Unified Inch Screw Threads (UNJ Thread Form) V Thread Form ASME B1.20.1-2013: Pipe Threads, General Purpose (Inch) Pipe Thread Form ANSI B1.20.3-1976 (R2013) Dryseal Pipe Threads (Inch) Pipe Thread Form ASME B1.20.7-1991 (R2013) Hose Coupling Screw Threads - Inch: Pipe ...

4. Screw thread - Wikipedia

   en.wikipedia.org/wiki/Screw_thread

   Graphic representation of formulas for the pitches of threads of screw bolts A good summary of screw thread standards in current use in 1914 was given in Colvin FH, Stanley FA (eds) (1914): American Machinists' Handbook, 2nd ed, New York and London, McGraw-Hill, pp. 16–22. USS, metric, Whitworth, and BA standards are

5. British Association screw threads - Wikipedia

   en.wikipedia.org/wiki/British_Association_screw...

   The thread angle is different from that used by Whitworth (55°), US Unified threads (60°) and ISO Metric (60°) so BA fasteners are not properly interchangeable with Whitworth or metric ones even when the pitch and diameter are similar enough that they can be screwed together (e.g., although 0BA appears similar to M6×1mm, the male and female ...

6. Width across flats - Wikipedia

   en.wikipedia.org/wiki/Width_across_flats

   The two systems are in general not compatible, which can result in rounding of nuts and bolts (i.e. using a 13 mm (0.51 in) spanner in place of a 1 ⁄ 2 inch (12.70 mm)). A few sizes are close enough to interchange for most purposes, such as 19 mm (close to 3 ⁄ 4 inch (19.05 mm)), 8 mm (close to 5 ⁄ 16 inch (7.94 mm)) and 4 mm (close to 5 ...

7. List of DIN standards - Wikipedia

   en.wikipedia.org/wiki/List_of_DIN_standards

   Fasteners – Part 26: Technical delivery conditions; Conical spring washers for bolt/nut assemblies: Active: DIN 267-27: Fasteners – Part 27: Technical specifications; Steel screws, bolts and studs with adhesive coating: Active: DIN 267-28: Fasteners – Part 28: Technical specifications; Steel screws, bolts and studs with locking coating ...