Maun · SKU 1701-018

Maun Steel Straight Edge Imperial 18″ (1701-018)

Compact handling. Extra reach.

The Maun Steel Straight Edge Imperial 18″ (1701-018) is a 457 mm carbon-steel straight edge with a precision-ground bevelled working edge, accurate to 0.001 inch per foot (0.084 mm per metre). UK-made, it’s a bench tool for cover plates, gaskets, small frames, wallets and short straps.

£30.00inc. VAT · £25.00 ex VATIn stock

Length

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18″ length adds useful reach without losing bench control.
Accurate to 0.001 inch per foot (0.084 mm per metre): within 0.0015 in (0.038 mm) over the full 18″.
Bevelled working edge gives a clear line of sight on covers, gussets and short straps.
Robust 3.25 mm carbon-steel body: reassuringly heavy, yet easy to handle on the bench.

Best suited to

Cover plates
Small frames
Gussets
Short straps

UK-madeMade by Maun

12 months’ warrantyOr 2 years when you register it

Stated accuracy0.084 mm per metre

Product description

The 18″ model gives you extra reach without becoming cumbersome. It’s made for engineers, makers and leatherworkers who need a known straightness tolerance and a solid edge for everyday work.

Why the Maun Steel Straight Edge Imperial 18″ (1701-018) works

Accurate work. Less rework.

0.0015 in (0.038 mm)over the full 18″

Over 18″, the bevelled working edge stays within 0.0015 inch (0.038 mm) of true.
It gives you a known reference for small frames, panels and assemblies that have outgrown a 12″ tool.

See the line clearly.

18″of bevelled working edge

The bevel keeps your mark or cut in view along the full 18″, so you stay on the line from start to finish: whether you’re scribing a cover plate or cutting a gusset.

Built for repeated use.

3.25 mmcarbon-steel body

The robust 3.25 mm body gives the tool real weight without making it awkward.
It sits steady on the bench and stands up to everyday workshop use.

Best suited to

Manufacturing & Engineering

Choose the Maun Steel Straight Edge Imperial 18″ (1701-018) for small-to-medium plates, covers, gaskets and compact assemblies.

It gives you more reach than a 12-inch guide, with no loss of bench control.
The rigid carbon-steel body supports accurate scribing and alignment, and the bevel keeps the working line in view.
Its published accuracy of 0.001 inch per foot (0.084 mm per metre) gives you a known reference for practical checks on small frames and panels.

Leatherwork

The Maun Steel Straight Edge Imperial 18″ (1701-018) suits wallets, bags, gussets, short straps and scored fold lines: all completed in one pass at this length.

Its weight steadies the leather on the bench, the visible bevel improves knife control, and the wear-resistant steel stands up to repeated cutting.

Specifications

SKU	1701-018
Length	18″ (457 mm)
Body	surface-ground carbon steel, 53 mm wide and 3.25 mm thick
Working edge	precision-ground and bevelled
Accuracy	0.001 inch per foot (0.084 mm per metre)
Straightness over its length	within 0.0015 in (0.038 mm) over the full 18″
Storage	6 mm hanging hole; supplied in a wallet with anti-rust paper
Made	UK-made, under our ISO 9001 quality system
Warranty	Standard 12 months’ warranty. Register your tool to extend this to 2 years.
Alternatives	12″ for detail work; 24″ for longer panels and straps.

The working edge

The bevel runs along the whole of one long edge. You run your scriber or knife against it, so you can see the line as you go.

Frequently Asked Questions

What is an 18-inch steel straight edge used for?

An 18-inch (457 mm) steel straight edge suits small-to-medium bench work: cover plates, gaskets, small frames and assemblies in engineering, and wallets, bag gussets, short straps and fold lines in leatherwork. It gives you half as much reach again as a 12″ tool, and it still handles easily on the bench.

Should I choose the 12″, 18″ or 24″?

Match the tool to your longest regular line. The 12″ is for compact parts and tight spaces. The 18″ is the middle ground: extra reach without extra bulk. The 24″ covers bench-sized sheet and longer straps. Torn between two sizes? Choose the longer one. A short tool can’t finish a long line in one pass.

How accurate is the Maun 18-inch straight edge?

The bevelled working edge is accurate to 0.001 inch per foot (0.084 mm per metre), so over the full 18 inches it stays within 0.0015 inch (0.038 mm) of true. That’s practical workshop accuracy for marking, cutting and straightness checks. It isn’t a calibrated DIN 874 metrology straight edge.

Last updated 11 November 2026

Content reviewed by Rebekah Jackson, Digital Marketing Executive at Maun Industries Limited, formerly on Maun’s production team, on 21 October 2026. We last checked prices and stock against maunindustries.com on 11 November 2026.

Size check: is 18″ long enough?

It’s long enough for the long side of an A3 sheet (420 mm) in one pass.
It’s too short for the long side of an A2 sheet (594 mm). For that, choose the Maun Steel Straight Edge Imperial 24″ (1701-024).
One size down is the Maun Steel Straight Edge Imperial 12″ (1701-012).
One size up is the Maun Steel Straight Edge Metric 500 mm (1700-500).

Steel or aluminium: which suits your job?

This straight edge