... .00150.01 Permissible variations in diameter for rods Diameter, inch (mm)Tolerance, +/-inch (mm) 0.125~0.187 excl (3.175~4 ... strength, psi (MPa), ≥ Yield strength, psi (MPa), ≥ Elongation in 1 inch gage length, %, ≥ RO5200/RO5400 25000 (172) 15000 (103) 25 RO5252 ... (379) 20 RO5240 40000 (276)28000(193) 25 pure tantalum bar