Rail Fastener shall:
1. Hold railings securely at the rail seat.
2. Restrict the turning of the railing about the outer borders of the rail .
3. Minimise longitudinal movement of railings through creep and thermal forces.
4. Assist in retention of course indicator.
5. Not lead to harm to the railing.
Where practicable, rail fastenings will be self-tensioning or allow tightening of the fastening into a predetermined load.