SAE to Metric Calculator
Convert imperial (SAE) sizes to metric (millimetres) and vice versa. For bolts, sockets and wrenches. UK spelling. Free.
SAE to metric conversion
Convert between SAE (imperial) sizes in inches and metric sizes in millimetres. Used for socket sets, spanners, bolt heads and drill bits. 1 inch = 25.4 mm. UK spelling (millimetres) throughout.
Frequently Asked Questions
What is SAE vs metric?
SAE (Society of Automotive Engineers) uses imperial units (inches, fractions). Metric uses millimetres. Common for bolt heads, sockets and wrenches. 1 inch = 25.4 mm.
How do I convert SAE to metric?
Multiply inches by 25.4 to get millimetres. E.g. 1/2 inch = 12.7 mm. This calculator does it for you.
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