AS 1559:2018 PDF

AS 1559:2018 PDF

Specifies the requirements for hot-dip galvanized bolts and step bolts with ISO metric coarse pitch series threads for normal and low temperature applications in tower construction, and associated nuts and washers.

This Standard was prepared by the Australian members of Standards Australia/Standards New Zealand Committee ME-029, Fasteners, to supersede AS/NZS 1559—1997, Hot-dip galvanized steel bolts and associated nuts and washers for tower construction.

After consultation with stakeholders in both countries, Standards Australia and Standards New Zealand decided to develop this Standard as an Australian Standard rather than an Australian/New Zealand Standard.

The objective of this Standard is to provide designers and manufacturers with specifications for bolts, nuts and washers suitable for use in tower construction. There are no ISO Standards for bolts for tower construction. IFI 541:1982, Metric hex transmission tower bolts, was used for guidance in the preparation of this Standard.

Bolts for tower construction have shorter thread lengths than specified in ISO 888:2012, Fasteners—Bolts, screws and studs—Nominal lengths, and thread lengths, to ensure that in a connection the shear planes will occur through the unthreaded shank. Other features are in accordance with the following ISO Standards:

ISO

272 Fasteners—Hexagon products—Widths across flats

885 General purpose bolts and screws—Metric series—Radii under the head

4759 Tolerances for fasteners

4759.1 Part 1: Bolts, screws, studs and nuts—Product grades A, B and C

The mechanical properties specified for tower bolts include appropriate shear strength and impact strength requirements suitable for the application.

Changes introduced in this edition of the Standard include the following:

(a) Introduction of provisions for spring washers developed from the withdrawn Standard, AS 1968—1976, Helical spring lock washers (metric series).

(b) Marking for bolts and nuts has been changed to be consistent with ISO marking requirements.

(c) A new section covering the requirements for identification and testing has been included.