IS 8630 : 1977 Specification for Engineers' Drawing Instruments, Double Line Pens

1 Scope

1.1 This standard covers the requirements of double line pen foruse in drawing offices.

2 References

IS 2 :1960Rules for rounding off numerical values

IS 1068 :1968Specification for electroplated coatings ofnickel and chromium on iron and steel

IS 3222 : Part I :1966 Specification for instrument screws:Part I Fasteners for drawing instruments