🛠️ A guide to spanner sizes based on bolt and nut dimensions
🔧 Publisher: PIPE LINE DZ by Battaze Tarek
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🔍 What Is a Spanner Size?
Spanner size refers to the width across flats (AF) — the distance between two parallel sides of a bolt or nut head. It's the size printed on a spanner or wrench and matches the nut size or bolt head size it is intended for.
📏 In practice:
An M10 bolt requires a 17 mm spanner
A 3/8” bolt needs a 9/16” spanner
📘 Standards vary slightly by region:
Metric (ISO, DIN)
Imperial (inch) – commonly used in the US and oil & gas equipment
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📐 Common Metric Spanner Sizes (ISO Standard)
🔸 M6 Bolt ➡️ 10 mm spanner
🔸 M8 Bolt ➡️ 13 mm spanner
🔸 M10 Bolt ➡️ 17 mm spanner
🔸 M12 Bolt ➡️ 19 mm spanner
🔸 M14 Bolt ➡️ 22 mm spanner
🔸 M16 Bolt ➡️ 24 mm spanner
🔸 M20 Bolt ➡️ 30 mm spanner
🔸 M24 Bolt ➡️ 36 mm spanner
🔸 M30 Bolt ➡️ 46 mm spanner
🔸 M36 Bolt ➡️ 55 mm spanner
🔸 M42 Bolt ➡️ 65 mm spanner
🔸 M48 Bolt ➡️ 75 mm spanner
🔧 These values are based on standard hex bolts (DIN 933 / ISO 4014).
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📏 Common Imperial (Inch) Spanner Sizes
🔹 1/4” bolt ➡️ 7/16” spanner
🔹 5/16” bolt ➡️ 1/2” spanner
🔹 3/8” bolt ➡️ 9/16” spanner
🔹 7/16” bolt ➡️ 5/8” spanner
🔹 1/2” bolt ➡️ 3/4” spanner
🔹 5/8” bolt ➡️ 15/16” spanner
🔹 3/4” bolt ➡️ 1-1/8” spanner
🔹 1” bolt ➡️ 1-1/2” spanner
📌 Mainly used for ASME / ANSI flange bolts and valve connections in the oil & gas sector.
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