BS EN ISO 888:2018 pdf free

BS EN ISO 888:2018 pdf free.Fasteners一Bolts, screws and studs一Nominal lengths and thread lengths
This International Standard 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 Normative 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一Basic profile一Part 1: Metric screw threads
ISO 225, Fasteners 一Bolts, screws, studs and nuts一Symbols and descriptions of dimensions
ISO 4753, Fasteners一Ends of parts with external ISO metric thread
ISO 4759-1, Tolerances for fasteners一Part 1: Bolts, screws, studs and nuts一Product grades A, B and C
3 Symbols
thread length
thread length of one end for double-end stud
thread length of the other end for double- end stud
thread length of the stud metal end
basic major diameter (nominal diameter) of the thread
nominal length (of the bolt, screw or stud)
distance from the bearing face to the first full form (full profile) thread (bolt), as specified in ISO 225
length of the unthreaded shank
pitch of the thread
The nominal length, I, and the thread length, b, features for bolts, screws and studs are specified in ISO 225.
Points for bolts and screws are usually included in the length and thread length, except for the pilot point; they are specified in ISO 4753.
4.2 Bolts and screws
For bolts and screws with effective bearing surface perpendicular to the axis, the length shall be defined from the bearing face to the end of the bolt or screw; see Figure 1.
For flat countersunk bolts and screws, the length shall be defined from the upper edge of the head to the end of the bolt or screw; see Figure 2.
For raised countersunk bolts and screws, the length shall be defined from the theoretical intersection of the top surface of the head with the head diameter to the end of the bolt or screw; see Figure 3.BS EN ISO 888 pdf free.