A single row of parallel, diagonal teeth. Ideal for light-pressure applications, such as producing smooth surface finishes or sharpening knives, shears, and saws.
Metal Files: Your Complete Selection Guide
From heavy stock removal to fine finishing, learn which file type, tooth pattern, and coarseness will deliver the results you need.
How to Choose a Metal File
Hand file selection depends on the size and contours of the item you are shaping, as well as personal preference and the specific task. To get the best results, start by considering the work to be done, then choose the appropriate file size, coarseness, tooth type, and shape.
The metal file size and coarseness go hand in hand. Larger files are coarser, removing more material but leaving a rougher finish. Smaller files are finer, removing less material but producing a smoother finish.
Once you determine the size and coarseness, select the tooth type. Use double-cut files for fast stock removal, and smooth double-cut or single-cut files for finishing work.
File shape plays a major role in achieving the desired contour. A triangular file works best for acute internal angles, square corners, and sharpening saw teeth. Flat files are for general-purpose work, square files for enlarging rectangular holes, round files for enlarging round holes, and half-round files for both flat surfaces and curved grooves.
In short, a metal file is a hand tool with a hardened, toothed surface used to shape, smooth, or remove material from metal by hand, and hand files remain the standard choice for deburring, fitting, and finishing work that power tools are too aggressive for.
Parts of a Hand File & Terminology
Knowing the parts of a file makes it easier to talk through technique, care, and specs with confidence. Here is the terminology to know:
Back: The convex side of a half-round or similarly shaped file.
Edge/Safe Edge: The side surfaces of a file. May be smooth (safe edge) or have teeth.
Handle: A holder into which the tang of the file fits. If the file has an integral holder, this is known as a solid handle file.
Pinning: The buildup of filings lodged between the file’s teeth.
Shelling: The breakage of file teeth, often caused by excessive pressure, reverse filing, or filing sharp corners and edges.
Understanding Hand File Tooth Types and Coarseness
Two key attributes determine how aggressively a metal file removes material and how smooth the resulting finish will be: tooth type and coarseness. Choosing the right combination depends on whether the task is roughing (removing material quickly) or finishing (creating a smooth, refined surface).
Metal File Teeth Types
There are four main metal file tooth cut types, and matching the right one to your task is what separates a fast, rough cut from a smooth, controlled finish.
Metal File Coarseness
Coarseness is graded differently depending on whether a file is Swiss pattern or American pattern, so it helps to know which family you are working with before comparing grades.
Metal File Shapes
There are several distinct types of metal files and their uses come down to cross-section shape and contour, so picking the right one starts with matching shape to the geometry you are filing.
The type or shape of a file refers to its cross-section, such as rectangular, square, round, half-round, or triangular. The shape should match the area being filed. File types are further classified by their contour: blunt or tapered.
The type or shape of a file refers to its cross-section, such as rectangular, square, round, half-round, or triangular. The shape should match the area being filed. File types are further classified by their contour: blunt or tapered.
Blunt File
Maintains a constant width with parallel edges from end to end. Ideal for uniform workpieces where only one file size is needed.
Taper File
Decreases in width, thickness, or both from heel to point. Allows the user to vary the contact area without changing files, making it useful for complex shapes and varying filing needs.
How to Use a File Correctly
Metal File Care
- Protect the teeth of the file when not in use by hanging it on a rack or keeping it in a drawer with wooden divisions.
- Keep hand files clear of water or grease, as these can impair their cutting action.
- When carrying hand files in a toolbox, wrap them in a cloth for protection.
- Keep file teeth clean at all times by using a file card or a wire file brush to clear the grooves between the teeth.
- Never use a metal file without a tight-fitting handle, as serious accidents can result if the handle becomes detached, exposing the sharp point of the tongue.
Shop Metal Hand Files
Frequently Asked Questions
A metal file is a hand tool used to shape, smooth, deburr, or remove small amounts of material from metal and other workpieces. Hand files are common for finishing edges, fitting parts, sharpening tools, and any job where a power tool would remove too much material too fast.
A single-cut file has one row of parallel teeth and is meant for light pressure and smooth finishing work. A double-cut file has two crossing rows of teeth and is built for heavier pressure and faster stock removal, at the cost of a rougher finish than a single-cut file leaves.
Rasp-cut files leave the roughest finish and are meant for fast material removal on soft materials like wood, aluminum, and lead. Single-cut files, especially in a smooth or fine grade, leave the smoothest finish and are the right choice for final finishing passes.
Bastard is a coarseness grade, it is the coarsest of the three main American pattern grades, ahead of second-cut and smooth-cut. A mill file, by contrast, refers to a single-cut, flat file shape traditionally used for sharpening mill and saw blades and for light finishing work. A mill file can come in a bastard, second-cut, or smooth-cut grade.
Swiss pattern files are smaller and finer, built for precision and intricate work, and come in seven coarseness grades from 00 (coarsest) to 6 (finest). American pattern files are larger and generally coarser, with three main grades: bastard-cut, second-cut, and smooth-cut. In both families, coarseness scales with file length while the proportional difference between grades stays consistent.
To request a quote, please login to your existing account or register a new one. This helps us provide you with a personalized experience and keep track of your requests.