Fan Disk Lock Washer

DIN : 6798 IS : 5556

Fan Disk Lock Washer
Fan Disk Lock Washer
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Scope

This Indian Standard covers the requirement for serrated lock washers for threaded fasteners sizes in the range M 1.6 to 30.

Types

The serrated lock washers for threaded fasteners shall be of the following three types:

  • Type A- Externally toothed
  • Type B- Internally toothed
  • Type C- Countersunk externally toothed

Grades

The serrated lock washers shall confirm to precision grade of IS: 5369:1975.

Dimensions

The dimensions for type A and Type B serrated lock washers shall be given as in Table 1.

The dimensions for Type C serrated lock washers shall be given as in Table 2.

Material

The serrated lock washers shall be made from suitable spring steel EN42J, 304, 316 and Copper.

Hardness

For Spring Steel Washers- It shall be hardened and tempered to HV 430 to 530 tested in accordance with IS 1501 (part 1): 1984.

Finish

The serrated lock washer shall be supplied in natural black finish unless otherwise specified by the purchaser. At the request of the purchaser, the serrated lock washer may be phosphate, tinned, galvanized, nickel plated, copper plated, cadmium plated, etc.