Tender for North Frontier Railway - NTID 22717181
North Frontier Railway
Dimapur, Nagaland, India
NTID 22717181
- Opening Date : Wed 16th September, 2020
- Closing Date : Thu 24th September, 2020
- ₹ 0.00
- NTID 22717181
Supply of High carbon spring steel double coil lock washer to counteract the loss in inherent tension caused by setting or creep of a bolt/nut assembly provided that they are sufficiently resilient to increase. the overall resilience of the assembly and that their inherent springiness can compensate for any loss in tension so that the clamping force required to ensure the reliability of the assembly is maintained. There may be a relative movement between bolt and nut if the friction between the clamped components is overcome by transverse forces. If this does occur, loosening of the assembly cannot be prevented by spring lock washers. The spring lock washers shall be made from suitable steel according to IS 4072 : 1975 to meet the requirements specified. The hardness shall be tested in accordance with IS 1501 ( Part 1 ) : 1984. For checking hardness, the washers shall be lightly ground to assure the removal of a decarburized or plated surface. Note:-Material should strictly comply to the given specifications. in case of any deviations, the materials may be rejected on suppliers own risk and cost.
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