Spacing of rivets according to IS 800-1962

Following limitations are recommended:

1. The distance between center of adjacent rivets should not be less then 2.5 times the diameter of rivet hole
2. The distance between the centres of two adjacent rivets ( including tacking rivets ) joining the members both in conpresscom or in tension should not exceed 32t or 300 mm which ever is less , where t is the thickness of the cover plate 
3. The diadista between the centres of two adjy rivets in the direction of stress shall not exceed 16 t or 200mm whichever is less in tension and 12 t or 200 mm whichever is less in compression