Machinery's Handbook, 31st Edition
818
Surface Texture
1.6
XX 1.6
Unless Otherwise Specified: All Surfaces 3.2
Fig. 8. Application of Surface Texture Symbols Roughness and waviness measurements, unless otherwise specified, apply in a direction which gives the maximum reading, generally across the lay. Cutoff or Roughness Sampling Length, (l): Standard values are listed in Table 2. When no value is specified, the value 0.8 mm (0.030 in.) applies. Table 2. Standard Roughness Sampling Length (Cutoff) Values mm in. mm in. 0.08 0.003 2.5 0.1 0.25 0.010 8.0 0.3 0.80 0.030 25.0 1.0 Roughness Average (Ra or R a ): The preferred series of specified roughness average values is given in Table 3. Table 3. Preferred Series Roughness Average (Ra) Values μm μin μm μin μm μin 0.012 0.5 0.40 a 16 a 4.0 160 0.025 a 1 a 0.50 20 5.0 200 0.050 a 2 a 0.63 25 6.3 a 250 a 0.075 a 3 0.80 a 32 a 8.0 320 0.10 a 4 a 1.00 40 10.0 400 0.125 5 1.25 50 12.5 a 500 a 0.15 6 1.60 a 63 a 15 600 0.20 a 8 a 2.0 80 20 800 0.25 10 2.5 100 25 a 1000 a 0.32 13 3.2 a 125 a … … a Recommended
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