Convert 5/16 Inches to MM - Accurate Calculator
Convert 5/16" to millimeters with high precision
Results at Different Precisions
5/16 inch = 7.9375 mm exactly.
Exact result
Exact conversion: 5/16 × 25.4 = 7.9375 mm.
Approximation
Common approximation: 7.94 mm for precise decimal notes, or about 8 mm for rough shop conversation.
Fit caveat
Do not assume M8 or 8 mm hardware is an automatic substitute. 8 mm is 0.0625 mm larger than 5/16 inch.
Bolts and drill bits
5/16 inch is common in bolt, clearance, and drill bit references. Use 7.9375 mm for exact conversion before choosing a metric substitute.
Cabinet and shop hardware
For cabinet hardware, jigs, and shop notes, 7.94 mm is a useful short decimal while preserving the exact 5/16 inch meaning.
Nearby fractions: 1/4 inch is 6.35 mm, 3/8 inch is 9.525 mm, and 1/2 inch is 12.7 mm.
🔧 DIY & Hardware
For hardware and DIY projects, 5/16" equals 7.94 mm, which is essential when working with metric tools or international specifications.
⚙️ Engineering & Manufacturing
In engineering contexts, 5/16" converts to 7.937500 mm with high precision for accurate technical specifications.
Frequently Asked Questions
How many mm is 5/16 inch?
5/16 inch is 7.9375 mm exactly.
Is 5/16 inch the same as 8 mm?
No. 5/16 inch is 7.9375 mm, while 8 mm is 0.0625 mm larger. It may be close, but it is not exact.
What is the common approximation for 5/16 inch in mm?
Use 7.94 mm for a short decimal approximation, or about 8 mm only for rough conversation.
What is 5/16 inch used for?
It is often used for bolts, drill bits, cabinet hardware, shop jigs, and mixed imperial/metric hardware notes.
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