استانداردهای مهندسی سری دوم
1- ISO 6157-1: Fasteners - Surface discontinuities - Part 1: Bolts, screws and studs for general requirements (2.68 MB)
2. ISO 6157-2: Fasteners - Surface discontinuities - Part 2: Nuts (2.15 MB)
3. ISO 6157-3: Fasteners - Surface discontinuities - Part 1: Bolts, screws and studs for special requirements (3.72 MB)