AS 1559-2018 pdf free.Australian Standard Hot-dip galvanized steel bolts and associated nuts and washers for tower construction.
2.1 1FTHOl) OF 1AMJFAcTuRF:
Bolts shall be—
(a) hot or cold forged with or without secondary machining; or
(b) machined from bar stock.
2.2 SHAPI, I)IN1FNSIONS ANI) FINISH
2.2.1 Head
The heads of bolts shall be in accordance with hgure 2.1 and Table 2.1 and the dimensions given for M16. M20 and M24 arc also applicable to step bolts. The dimensions given in Table 2. I shall apply before hot-dip galvanizing.
2.2.2 Length
The length of bolts shall be as given in Table 2.3 for single-nut tower bolts. Table 2.4 for double-nut tower bolts and Table 2.5 for step bolts.
NOTE: Clamping lengths for tower bolts with flat washers and spring washers arc given in Appendix A.
2.2.3 F:nds
The ends of bolts shall be finished with a 45-degree chamfer to a depth slightly exceeding the depth of thread (see Figure 2.1).
2.2.4 Screw threads
2.2.4.1 General
The form of thread, diameters and associated pitches of bolts shall be the ISO coarse pitch series in accordance with AS 1275.
Screw threads shall be formed by thread rolling or thread cutting.
2.2.4.2 Tolerances
The screw threads shall be in accordance with tolerance class g of AS 1275.
The 8g tolerance class shall apply before hot-dip galvanizing.
2.2.5 Thread length
The thread lengths (h) for bolts shall be as shown in Table 2.2.
The nominal thread length of step bolts shall be as required to maintain the maximum grip length (lg) given in Table 2.5.
The tolerances on the thread length shall be such that the grip lengths (lg) and unthreaded shank lengths (1,) given in Tables 2.2. 2.3. 2.4 and 2.5 are maintained.
2.2.6 Squareness. concentricity and symmetry of bolts
2.2.6.1 Squareness of hearing face
When determined as shown in Figure 2.2(a). the bearing face of the head shall be square. rithin the values given in Table 2.1, to the shank or pitch diameter of the screw thread. The
values are based on an angle of two degrees.AS 1559 pdf download.