Abstract： AS/NZS 1390:1997 pdf download.cup head bolts with ISo metriccoarse pitch threads. 5.6 Squareness, concentricity and symmetry of cup head bolts 5.6.1 Squareness of bearing face When determined as shown in Figure 3(a). the bearing face of the...

AS/NZS 1390:1997 pdf download.cup head bolts with ISo metriccoarse pitch threads.

5.6 Squareness, concentricity and symmetry of cup head bolts

5.6.1 Squareness of bearing face When determined as shown in Figure 3(a). the bearing face of the head shall be square. within the values given in Figures I and 2, to the shank or screw thread. The values are based on an angle of 2 degrees.

5.6.2 Concentricity of shank to screw thread When determined as shown in Figure 3(b). the shank for a distance of 1.5 diameters

from the nearest face of a Sg GO screw ring gauge screwed as far as practicable on to the thread by hand shall he concentric,

within the values given in Figures 1 and 2. to the pitch diameter of the screw thread.

5.6.3 Concentricity of head to shank The head of a cup head bolt shall fit within an envelope concentric with the shank and defined by the maximum head diameter given in Figures I and 2 plus the 2 x ITl5 tolerance in accordance with AS 1654.1 on the nominal

diameter of the thread.

5.7 Shank

5.7.1 Dianwter The diameter of the unthreaded shank of cup head bolts shall be as given in Figures 1 and 2.

5.7.2 Straightness Cup head bolts shall be straight to within the tolerance given in Figure 3(c).

5.8 Underhead fillet The radius of the following fillet junctions shall be not greater than the value (r) given in Figures 1 and 2:

(a) Between the head and square neck of a square neck bolt.

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