Hobson technical document
Imperial Spanner Size Chart for UNC and UNF Hex Bolts and Nuts
Hobson's one-page chart of spanner sizes for imperial hex bolts and nuts with UNC or UNF threads, made to AS 2465 and ANSI B18.2.1. It runs from 1/4 inch to 4 inch bolts.
What this covers
- Bolt size
- Spanner size, AS 2465 and ANSI B18.2.1
Applies to Hex Bolts & Set Screws and Hex Nut.
Key things to remember
The essentials from this document in plain words. Check the full document before you rely on a figure.
- Covers bolt sizes from 1/4 inch to 4 inch, for UNC and UNF threads.
- Sizes are for bolts and nuts to AS 2465 and ANSI B18.2.1.
- Common sizes: 1/4 inch bolt 7/16 inch spanner, 3/8 inch 9/16 inch, 1/2 inch 3/4 inch, 5/8 inch 15/16 inch, 3/4 inch 1-1/8 inch, 1 inch 1-1/2 inch.
- Larger sizes: 1-1/2 inch bolt 2-1/4 inch spanner, 2 inch 3 inch, 3 inch 4-1/2 inch, 4 inch 6 inch.
Who it helps: Fitters and staff sizing a spanner or socket for imperial bolts and nuts.
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This document is published by Hobson Engineering, who supply this range to us. We show it here in full so you can read it next to the product; the summary above is ours. Read it on this page or download the PDF. For the most current version, ask us.
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