BS EN ISO 888:2018 pdf download
BS EN ISO 888:2018 pdf download.Fasteners – Bolts, screws and studs -Nominal lengths and thread lengths.
BS EN ISO 888 specifies lengths and thread lengths for bolts, screws and studs for use in appropriate product standards and other relevant documents. e.g. for parts per drawing.
It applies to bolts, screws and studs with ISO metric screw thread according to ISO 68.1.
2 Norniative references
The following referenced documents are Indispensable for the applicatIon of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 68-1. Iso general purpose screw threads — Bas,c profile — Part 1: Metric screw threads
ISO 225. Fasteners — Bolts, screws, studs and nuts — Symbols and descriptions of dimensions
ISO 4753, Fasteners — Ends of parts with external ISO metric thread
ISO 4759-1. Tolerances for fasteners — Part 1: Bolts, screws, studs and nuts — Prod uct grades A, B and C
3 Symbols
b thread length
b thread length of one end for double-end stud
thread length of the other end for double•end stud
b m thread length of the stud metal end
d basic major diameter (nominal diameter) of the thread
nominal length (of the bolt, screw or stud)
K distance from the bearing face to the first full form (full profile) thread (bolt), as specified in ISO 225
1% length of the unthreaded shank
P pitch of the thread
4 Position of lengths and thread lengths
4.1 General
The nominal length. I, and the thread length, b, features for bolts, screws and studs are specified in 1S02Z5.
Points for bolts and screws are usually included in the length and thread length, except for the pilot point; they are specified in ISQ AZ53.
