The Nuts & Bolts of Screws

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1. How screw sizes are designated: Imperial and Metric

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2. How to measure screw sizes: Imperial and Metric

• From McMaster-Carr

Handy Tip: SCREW_NUMBER_SIZE x 0.013" + 0.060" = SCREW_DIAMETER

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3. How Torque Works:

Chart showing proper torque for various screw sizes

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4. Screw Head styles and their drivers:

Hex head

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5. Specialty hardware:

Nyloc Nuts - Stay in place without needing to be tightened

PEM Nuts - Installing PEM self-clinching nuts in sheet metal

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Additional links:

• Machine Screws on Wikipedia

• Screw Threads on Wikipedia

• Nuts on Wikipedia