• Plain end pipe ≤ 100 mm (4 in.) NB: 1.65 mm (0.065 in.)
• Plain end pipe ≤ 100 mm (4 in.) NB for hydraulic oil service: 0
• Plain end pipe > 100 mm (4 in.) NB: 0
• Threaded pipe ≤ 9.5 mm (3/8 in.) NB: 1.27 mm (0.05 in.)
• Threaded pipe > 9.5 mm (3/8 in.) NB: [0.8 × (mm per thread)] or [0.8 ÷ (threads per in.)]
• Grooved pipe: depth of groove