Triangular File
Product Code : LSK-SWES-10709
Triangular File (SKU LSK-SWES-10709), often called a three-square file, is a tapered file of triangular section mounted on a hardwood handle for a secure grip. Its sharp edges reach into corners and acute internal angles that a flat file cannot, and it is also used to score glass and to re-shape damaged threads. Science Lab Supplies supplies it from Ambala, India to technical training institutes, college workshops and laboratories, contractors and distributors.
Specifications
Every technical detail of the triangular file is listed in the table below. In short, it is a tapered file of triangular section, with each face meeting the next at 60 degrees, mounted on a hardwood handle so that it is ready to use and safer for trainees than a bare tang.
| Specification | Value |
|---|---|
| SKU | LSK-SWES-10709 |
| Also known as | Three-square file |
| Section | Triangular |
| Shape | Tapered towards the tip |
| Handle | Hardwood, fitted |
| Internal angles | Acute internal angles greater than 60 degrees |
| Corners | Clearing out square corners |
| Thread work | Re-shaping damaged threads on bolts and screws |
| Glass work | Scoring glass before cutting |
| Use | General laboratory and workshop use |
| Supplied by | Science Lab Supplies, Ambala, India |
Applications and Experiments for the Triangular File
The triangular file is used wherever an angled or cornered profile must be cleaned out by hand: square corners, acute internal angles greater than 60 degrees, and the flanks of bolt and screw threads. In laboratories it is also the usual tool for scoring glass tubing before it is snapped.
- ITI Fitter and Welder trades: clearing corners and notches in fitting jobs.
- Maintenance training: re-shaping damaged threads on bolts and screws, then checking threads per inch on a Center Gauge.
- School and college chemistry labs: scoring glass tubing, such as the Glass Tubes of Different Diameters, before cutting.
Standard Scope of Supply
Each Triangular File is supplied as a single tapered, triangular-section tool with its hardwood handle already fitted. It needs no further assembly before use, and any optional accessories or additional hand tools you want with it are listed separately on the quotation.
Packing, MOQ and Lead Time
Quotations are prepared for any quantity, from a few files for a laboratory to one per trainee for a full workshop intake. Every quotation sets out the packing, delivery time and price for the quantity you name, and it can include the other files and hand tools you need.
As a registered exporter with an Importer-Exporter Code, Science Lab Supplies can ship to buyers in Vietnam, Malaysia, Peru, Egypt, Iraq and Nigeria. To ask for a quotation on triangular files, write through the contact page or add them to the enquiry cart, and check the lab tender page if you are buying against a tender.
Frequently Asked Questions
Can a triangular file be used to cut glass tubing?
Yes. It is used to make a single score mark on glass tubing or rod, which is then snapped by hand. Wear eye protection such as Safety Goggles, Polycarbonate, 12 pcs and protect your hands with a cloth when breaking the glass.
Does the file come with a handle?
Yes. It is mounted on a hardwood handle, so it can be used straight away without fitting a separate handle to the tang. The handle also gives trainees a secure grip.
Who supplies the Triangular File?
Science Lab Supplies supplies it from Ambala, India, alongside its flat and round files and other workshop hand tools for training institutes and laboratories. Quotations can cover single files or full workshop sets.
Which length and grade can be supplied?
Length and grade of cut are confirmed at enquiry. Tell us the length and grade you need through the contact page and both will be stated on the quotation, alongside packing and delivery time.
Related Files, Cutting and Thread Tools
The tools below cover the other steps around a triangular file at the bench or in the laboratory: flat and curved filing, cutting stock and sheet, holding the work and checking threads. They come from the welding set and the metal manufacturing range, and any of them can share the quotation.
- Flat File — bastard, second-cut and smooth grades, 4 to 14 in long.
- Round File — rough, medium and smooth grades, 4 to 14 in long.
- Hacksaw Frame — 12 in powder-coated steel frame with wooden handle, supplied with a 300 mm blade.
- Manual Hand Shear — 12 in hardened high-carbon steel blade; cuts rod steel up to 13 mm.
- Tilting and Swiveling Vice — hardened and ground V-grooved jaws, 3 to 8 in sizes.
- Threading Tool Holder — carbide insert holder for external threading, 3-15/16 in long including the insert.
- Grinding Goggles — clear goggles against flying particles in turning, grinding, chipping and sanding.
Browse the full Standard Welding Equipment Set range, the Metal Manufacturing Training Machine range for vices, gauges and tool holders, or all TVET lab equipment.
Last updated: 9 October 2026
