Galvanised wire

Press, 18 April 1980, Page 8

Galvanised wire

From

N.Z. WIRE

INDUSTRIES, LTD

Farmers recognise the qualities of New Zealand made galvanised fencing, which make it the most efficient and widely used stock control barrier in this country. In brief, the main advantages of galvanised wire are: Low cost — when compared with alternative materials. Workability — easily handled and erected as a stock control barrier. Availability — can be pur-

chased from all farm fencing outlets. Permanence — galvanised wire can be expected to outlast the life of your fence. There are two basic types of galvanised wire available from your wire

The breaking load is the maximum load your fencing wire can sustain under tension. The units used to express this property are newtons or kg force. The most widely used type of galvanised fencing wire in New Zealand is high tensile, namely 2.50 mm (12| gauge) and has largely superseded 4.00 mm (8 gauge) mild steel. The reason for such a switch stems from the following: (a) Length — a 25kg coil of: (i) 2.50 mm H.T. extends 648 metres; (ii) 4.00 mm M.S. extends 253 metres. (b) Elasticity —2.50 mm

stockist: Mild steel fencing wire and high tensile fencing wire. These wires differ in that they have different metallurgical properties and different performance -characteristics in a fence.

H.T. wire has a greater ability to return to its original length after being stretched, and will retain a more uniform tension under impact and under varying atmospheric conditions. However, this elastic quality will be lost if the wire is stretched (tensioned) beyond a certain point — the YIELD POINT — where permanent damage begins. As the load is increased above this point the wire will continue to stretch until it breaks. The yield point of any wire can be regarded as 75 per cent of its breaking load.

Galvanised Fencing Wire Breaking Load Minimum 1. Mild Steel kg/f . Ibs/f 4.50mm (7 gauge) 700 1600 4.00mm (8 gauge) 600 1350 3.55mm (9 gauge) - 450 1000 3.15mm (10 gauge) 350 800 2;50mm (12i gauge) 200 500 2.00mm (14 gauge) 150 350 2. High Tensile Steel 185.0 3.15mm (10 gauge) 840 2.50mm (12| gauge) 600 1350 1.60mm (16 gauge). 200 500 Tensiles: 11b force = 0.453kg force 1 1kg force — 9.806 newtons