StewMac Gauged Nut Slotting File.016 in - Precise Nut & Saddle Slots

In this review the StewMac gauged nut slotting file.016 in is judged on accuracy and build for luthiers and hobbyists who need precise nut and saddle work. The bottom line: this tempered edge-cut file makes clean, round-bottom slots that help strings seat without buzzing, and it is best for anyone who routinely sets up guitars or works on metal saddles. It is a focused, professional tool that trades broad versatility for dependable, repeatable slot size and cut quality.

Key Features

• Tempered edge-cut design: Produces a round-bottom slot that helps strings sit properly and reduces buzzing at the nut.
• Chrome-alloy steel construction: Durable material that holds a cutting edge and stands up to repeated shop use.
• Twin 4 in cutting edges: Two usable edges extend tool life and provide consistent cuts for multiple jobs.
• .016 in gauge: Sized to match string gauges so you can cut slots that are the correct width for specific strings.
• Works on saddles too: Effective for Tune-o-matic and other metal saddles when round-bottom slots are required.

Who It's For

The file is aimed at busy repair shops, professional luthiers and dedicated hobbyists who need a reliable tool for cutting precise nut and saddle slots. If you routinely perform set ups, replace nuts or modify saddles, the consistent.016 in size and hardened edge make this a sensible addition to the bench.

Those who want a multipurpose file for many non-guitar tasks or who need a wide range of gauge sizes in a single tool should look elsewhere; this is a specialist instrument best used alongside a small set of other gauged files for full string coverage.

Pros & Cons

Pros

• High quality feel and accurate cut, which customers praise for producing neat, consistent slots.
• Tempered, chrome-alloy construction means good edge life and toughness for shop use.
• Works well on bone nuts and metal saddles, giving round-bottom slots that improve string seating.

Cons

• Price is higher than some basic files, and a few users noted the value-for-money tradeoff for a single gauge tool.

Specifications

Product name	Gauged Nut Slotting File.016 in
Brand	StewMac
Material	Chrome-alloy steel
Cutting edges	Twin 4 in edges
File type	Tempered edge-cut, round-bottom
Primary use	Nuts and saddles (including metal saddles)

Our Verdict

The StewMac.016 in nut slotting file is a solid, specialist tool for anyone who needs accurate, round-bottom nut and saddle slots; it is particularly useful in repair shops and for serious hobbyists who value cut consistency and durability. While it is a bit costly for a single gauge, its build quality and effective results make it a worthwhile purchase for targeted setup work.

Frequently Asked Questions

Can this file be used on metal saddles?
Yes. The tempered edge-cut form and chrome-alloy steel are suitable for cutting round-bottom slots in metal saddles.

Should the file match my string gauge exactly?
Ideally yes; use the same size or a few thousands larger. A slightly smaller file can be rocked side-to-side to widen a slot.

How long do the cutting edges last?
Edge life is good for shop use thanks to the tempered chrome-alloy construction, and the twin cutting edges provide extra usable life before replacement is needed.