SLS : 481 : 1980 : Specification for Hexagon bolts screws and nuts (commercial grade)
- Colombo BUREAU OF CEYLON STANDARDS 1980
STD2667
SLS 481 : 1980
a621.882
SRI LANKA-STANDARDS
STANDARDS-SRI LANKA
621.882
STD2667
SLS 481 : 1980
a621.882
SRI LANKA-STANDARDS
STANDARDS-SRI LANKA
621.882