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M10 bolt diameter
Exact matchHeavy-duty metric fastener
Hardware & Fasteners
Conversion breakdown
10 mm to inches
mmtoinches.imView decimal inches, fractional inches (1/32" precision), and feet+inches for 10 millimeters. Perfect for CNC setups, woodworking, construction documents, and any workflow where a single metric dimension needs multiple imperial formats.
Decimal inches
0.3937"
10 mm = 0.3937" (rounded to four decimals)
Fractional inches (1/32")
13/32"
Error ±0.012549"
Feet + inches
0.3937"
Total inches 0.3937"
Real-world size reference
Visualize 10 mm with familiar everyday objects and common items for better understanding.
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AAA battery diameter
Close matchAAA battery is 10.5mm in diameter
Electronics
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Standard pen diameter
Close matchCommon ballpoint pen body width
Office & Stationery
Note about measurements
Exact matches indicate precise dimensional equivalence. Close matches show similar sizes for visual reference. Always verify exact specifications for precision work, especially in engineering, manufacturing, or construction applications.
Visual size comparison
See how 10 mm compares to common reference sizes
Sizes are scaled for comparison. Click "Show 1:1 actual size" above to see the true physical size.
Tip: This visualization helps you quickly understand the relative size of 10 mm. Toggle between scaled comparison and 1:1 actual size using the button above.
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Common questions about 10 mm
Quick answers to frequently asked questions about this measurement, conversions, and practical applications.
10 mm equals 0.3937 inches. This conversion uses the international standard where 1 inch = 25.4 millimeters exactly.
10 mm is approximately 3/8". Approximately 3/8", with a 0.47mm difference. Suitable for rough measurements but verify for precision work.
10 mm is a medium drill bit size widely used in woodworking and metalworking. Common applications include M10 bolts, structural steel connections, and heavy equipment.
3/8" (9.525mm) is about 0.5mm smaller. Not recommended for M10 tap drills; better for clearance. Difference: 0.47mm.
A 10mm measurement is about the diameter of a standard AAA battery (10.5mm), the diameter of an M10 bolt, or the width of a typical ballpoint pen.
Still have questions? Try the interactive converter for more conversion options and tools.
Related conversions
Commonly used sizes near 10 mm, grouped by relevance. Each recommendation includes context to help you find the right conversion quickly.
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Electronics & Precision Work
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Conversion details
All calculations rely on the international standard of 1 inch = 25.4 millimeters. Decimal values are rounded to four places, fractional results use 1/32" increments with automatic simplification, and feet+inches formatting is ideal for dimensions above 300 mm. For higher precision, URL parameters, or bulk conversion needs, head back to the main calculator or batch converter.
At 10 mm (~0.3937 in), This is a small precision dimension. Fractional output (1/32") helps with fine workmanship; keep decimal inches for calculations and tolerance notes.