Sieve Numbers and Openings

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Commonly used US Standard sieve numbers and openings:

• No. 4 sieve opening = 4.75 mm
• No. 10 sieve opening = 2.00 mm
• No. 20 sieve opening = 0.85 mm
• No. 40 sieve opening = 0.425 mm
• No. 60 sieve opening = 0.25 mm
• No. 100 sieve opening = 0.15 mm
• No. 140 sieve opening = 0.106 mm
• No. 200 sieve opening = 0.075 mm

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