Machinery's Handbook, 31st Edition
LIMITS AND FITS 649 Table 6. ANSI/ASME Standard Tolerances ANSI/ASME B4.1-1967 (2009; out of print) Nominal Size, Inches Grade 4 5 6 7 8 9 10 11 12 13 Over To Tolerances in thousandths of an inch a 0 0.12 0.12 0.15 0.25 0.4 0.6 1.0 1.6 2.5 4 6 0.12 0.24 0.15 0.20 0.3 0.5 0.7 1.2 1.8 3.0 5 7 0.24 0.40 0.15 0.25 0.4 0.6 0.9 1.4 2.2 3.5 6 9 0.40 0.71 0.2 0.3 0.4 0.7 1.0 1.6 2.8 4.0 7 10 0.71 1.19 0.25 0.4 0.5 0.8 1.2 2.0 3.5 5.0 8 12 1.19 1.97 0.3 0.4 0.6 1.0 1.6 2.5 4.0 6 10 16 1.97 3.15 0.3 0.5 0.7 1.2 1.8 3.0 4.5 7 12 18 3.15 4.73 0.4 0.6 0.9 1.4 2.2 3.5 5 9 14 22 4.73 7.09 0.5 0.7 1.0 1.6 2.5 4.0 6 10 16 25 7.09 9.85 0.6 0.8 1.2 1.8 2.8 4.5 7 12 18 28 9.85 12.41 0.6 0.9 1.2 2.0 3.0 5.0 8 12 20 30 12.41 15.75 0.7 1.0 1.4 2.2 3.5 6 9 14 22 35 15.75 19.69 0.8 1.0 1.6 2.5 4 6 10 16 25 40 19.69 30.09 0.9 1.2 2.0 3 5 8 12 20 30 50 30.09 41.49 1.0 1.6 2.5 4 6 10 16 25 40 60 41.49 56.19 1.2 2.0 3 5 8 12 20 30 50 80 56.19 76.39 1.6 2.5 4 6 10 16 25 40 60 100 76.39 100.9 2.0 3 5 8 12 20 30 50 80 125 100.9 131.9 2.5 4 6 10 16 25 40 60 100 160 131.9 171.9 3 5 8 12 20 30 50 80 125 200 171.9 200 4 6 10 16 25 40 60 100 160 250 a All tolerances above the heavy line are in accordance with American-British-Canadian (ABC) agreements. Table 7. Relation of Machining Processes to Tolerance Grades ANSI/ASME B4.1-1967 (2009; out of print)
TOLERANCE GRADES 45678910 11 1213
MACHINING OPERATION
Lapping & Honing Cylindrical Grinding Surface Grinding Diamond Turning Diamond Boring Broaching Reaming Turning
This chart may be used as a general guide to determine the machining processes that will, under normal conditions, produce work within the tolerance grades indicated. (See also Relation of Surface Roughness to Tolerances starting on page 813.)
Boring Milling Planing & Shaping Drilling The letter symbols used to designate standard fits are as follows: RC = Running or Sliding Clearance Fit
LC = Locational Clearance Fit
LT = Transition Clearance or Interference Fit LN = Locational Interference Fit FN = Force or Shrink Fit
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