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2. Roller chain - Wikipedia

   en.wikipedia.org/wiki/Roller_chain

   5 ⁄ 16: 5 ⁄ 8: 5 ⁄ 8: 50: 3 ⁄ 8: 3 ⁄ 4: 6 ⁄ 8: 60: 1 ⁄ 2: 1: 8 ⁄ 8: 80: 5 ⁄ 8: Notes: *The pitch is the distance between roller centers. The width is the distance between the link plates (i.e. slightly more than the roller width to allow for clearance). *The right-hand digit of the standard denotes 0 = normal chain, 1 ...

3. List of DIN standards - Wikipedia

   en.wikipedia.org/wiki/List_of_DIN_standards

   Product grade A washers – with a hardness up to 300 HV designed for use with hexagon head bolts and nuts: Withdrawn: DIN EN ISO 7089, DIN EN ISO 7090: ISO 7089, ISO 7090: DIN 126: Product grade C washers – designed for use with hexagon head bolts and nut: Withdrawn: DIN EN ISO 7091: ISO 7091: DIN 127: Spring lock washers with square ends or ...

4. Chain - Wikipedia

   en.wikipedia.org/wiki/Chain

   A common metal short-link chain Roller chains. A chain is a serial assembly of connected pieces, called links, typically made of metal, with an overall character similar to that of a rope in that it is flexible and curved in compression but linear, rigid, and load-bearing in tension.

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6. Specification (technical standard) - Wikipedia

   en.wikipedia.org/wiki/Specification_(technical...

   The following British standards apply to specifications: BS 7373-1:2001 Guide to the preparation of specifications [4] BS 7373-2:2001 Product specifications. Guide to identifying criteria for a product specification and to declaring product conformity [5] BS 7373-3:2005, Product specifications.

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8. Rockwell hardness test - Wikipedia

   en.wikipedia.org/wiki/Rockwell_hardness_test

   The 15T scale employs a 15-kgf load on a 1 ⁄ 16-inch-diameter (1.588 mm) hardened steel ball, and can be used on sheet metal. The B and C scales overlap, such that readings below HRC 20 and those above HRB 100, generally considered unreliable, need not be taken or specified.

9. ABEC scale - Wikipedia

   en.wikipedia.org/wiki/ABEC_scale

   The ABEC scale is designed to provide bearing manufacturers dimensional specifications that meet the standards of precision bearings in a specified class. The scale is also used by manufacturers who produce equipment that require bearings must also know the dimensional tolerances to design parts that will accommodate a bearing.