A good drafting triangle isn't something you think about until it's wobbly, warped, or missing from your kit. We carry standard 45° and 30°/60° triangles, adjustable triangles, and durable aluminum versions in several sizes and edge styles.
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Academic Transparent Triangles
Alvin Drafting$2.00 - $5.40These Academic Drafting Triangles have a double-taper cutout center for easy lifting, enhancing efficiency. Made from durable, extra-heavy acrylic, they resist discoloration and warping. Ideal for... -
Smoke Triangles - Inking Edge
Alvin Drafting$2.30 - $7.70The Alvin inking edge triangles are made of molded 0.10" thick polystyrene and feature a transparent non-glare smoke tint for easy visibility.Features: 30º/60º and 45º/90º trianglesAvailable in... -
Fluorescent Triangles - Straight Edge
Alvin Drafting$6.10 - $25.80The Alvin Professional Fluorescent triangle is extremely popular because the refracted light has an illuminating effect on the drawing by accentuating the triangles edge.Features: 30º/60º and... -
Topaz Triangles - Inking Edge
Pacific Arc$3.40 - $48.35The Pacific Arc inking edge triangles are made of molded 0.08" thick acrylic and feature a transparent non-glare smoke tint for easy visibility.Features: 30º/60º and 45º/90º trianglesAvailable in... -
Fluorescent Triangles - Straight-Edge
Pacific Arc$3.40 - $31.55The Pacific Arc Professional Fluorescent triangle is extremely popular because the refracted light has an illuminating effect on the drawing by accentuating the triangles edge.Features: 30º/60º and... -
Scholastic Fluorescent Triangles - Inking Edge
Pacific Arc$2.00 - $8.95The Fluorescent Scholastic Triangle is a transparent drafting triangle designed for drawing, drafting, and geometry applications. Constructed from 0.08" thick polystyrene, it features a fluorescent... -
Clear Acrylic Professional Triangles - Straight Edge
Pacific Arc$2.90 - $45.95The Pacific Arc Clear Professional triangles will not discolor or warp with age and handling. Features: 30º/60º and 45º/90º professional clear trianglesAcrylic that will not feather with... -
Clear Acrylic Triangles - Straight Edge
Alvin Drafting$5.70 - $58.80The Alvin Clear Professional triangles will not discolor or warp with age and handling. Features: 30º/60º and 45º/90º professional clear trianglesAvailable in multiple sizes ranging from 4" to... -
Drafting Triangle Set
Westcott$6.45The Westcott Drafting Triangle Set includes two transparent triangles designed for drafting, technical drawing, geometry, and design applications. The set includes a 6" triangle with 45°/90° angles... -
10" Fluorescent Triangles - Inking Edge
Alvin & Co.$2.80 - $3.80BulletsFeatures: 30º/60º and 45º/90º trianglesAvailable in multiple sizes ranging from 4" to 14"Inking-Edge Triangles0.10" thickFluorescent orange color reflects light along the drawing edgeEdges... -
Aluminum Calibrated Triangles
Alumicolor$5.95 - $10.75Alumicolor® Calibrated Aluminum Triangles are constructed from tempered aluminum for durability and long-term accuracy. The photo-anodized calibrations are permanently incorporated into the finish,... -
8" 45/90 Acrylic Cutting-Edge Triangle
Art Alternatives$13.30These clear acrylic triangles features grid markings including centering lines to facilitate scaled drawings, geometric compositions, and detailed linework. These are multi-use tools, handy for... -
Aluminum Triangles
Fairgate$22.40 - $45.60Lightweight, durable aluminum with matte-satin finish that resists stains and tarnishing. Features 1/16" graduations on the 90 angle. May also be used as a template for circles from 1/16" to 1 3/8"... -
2-Piece Aluminum Triangle Set
Alumicolor$12.00 - $14.70Alumicolor Calibrated Triangles are made of tempered aluminum. Photo anodized calibrations are a part of the finish and resist cleaning or rubbing off. Ultra smooth finish won't mark your work... -
3" Triangle Stainless Steel Ruler
Alvin Drafting$6.10Made of durable stainless steel with etched inch graduations, this drafting triangle ruler is ideal for hobby and craft projects, drawing, drafting, and more. Its high strength and hardness make it... -
College Combination Set
Staedtler$7.40Some of Staedtlers's most popular tools all in one set! These tinted plastic tools all have inking edges. 4-Piece Set Includes: 12" ruler 6" 45°/90° triangle 8" 30°/60° triangle 6" 180°... -
Computing Adjustable Triangle - Inking Edge
Alvin Drafting$20.40 - $33.75The Alvin Drafting Computing Adjustable Triangles are ideal for calculating length and distance in classrooms and professional applications, this tool features an optically clear acrylic body for... -
Plastic Math Set
Staedtler$2.60Stay prepared for math class with this essential 4-piece set, which includes a 6-inch ruler, a 4-inch protractor, a 45-degree triangle, and a 30/60-degree triangle. The transparent design of the... -
Professional Adjustable Triangle - Inking Edge
Pacific Arc$18.60 - $27.30Professional-quality adjustable triangle with inking edges.Features: 8", 10" or 12" adjustable triangleInking edge is compatible with any writing utensilMarked with rise in tangent, seconds, and... -
Professional Adjustable Triangles - Straight Edge
Staedtler$26.35 - $43.75Clear acrylic with smooth edges. Protractor section is graduated in 1/2 degree increments from 0 to 90 degrees. Available in even sizes from 8" to 12". Features: .118" thick clear acrylic...
45° and 30°/60° Triangles
These are the two triangles you will use most often. The 45° triangle has two 45° angles and one 90° angle, making it great for drawing vertical, horizontal, and 45° lines. The 30°/60° triangle provides 30°, 60°, and 90° angles and is commonly used for architectural drafting and isometric drawings.
If you are taking a drafting class, you will usually want both a 45° and a 30°/60° triangle. Used together, they allow you to draw additional angles such as 15° and 75° without the need for an adjustable triangle. That's one reason these two triangles remain standard items in most drafting kits.
Adjustable Triangles
An adjustable triangle allows you to set and lock almost any angle, making it more versatile than a standard 45° or 30°/60° triangle. They are useful for roof pitches, custom angles, and other layouts where fixed triangles can be limiting.
Most adjustable triangles lock into position with a thumbscrew, and many include angle graduations for quick reference. While not required for most drafting classes, they are a handy tool for advanced drafting and layout work.
Straight Edge or Inking Edge?
A straight edge triangle sits flat against the paper and works well for everyday pencil drafting. An inking edge triangle has a raised ridge along the edge that lifts it slightly off the paper, helping prevent technical pen ink from bleeding underneath and smearing.
If you are primarily working in pencil, a straight edge triangle is usually the best choice. If you are producing inked drawings, an inking edge can make a noticeable difference.
Smoke, Fluorescent, or Clear?
Clear acrylic triangles allow you to see your drawing underneath the tool, making alignment easy. Smoke triangles offer the same visibility while reducing glare from bright lights. Fluorescent triangles, often bright orange or yellow, are easy to spot on a crowded drafting table or job site and remain highly visible in a variety of lighting conditions.
The right choice usually comes down to personal preference, but many students and professionals prefer fluorescent triangles because they are easy to find when surrounded by plans, tools, and paperwork.
Complete Your Drafting Workspace
Pair your drafting triangles with other essential drafting tools to create accurate layouts, technical drawings, engineering plans, and architectural designs.
Shop Drawing Compasses | Shop Drafting Scales | Shop Protractors | Shop T-Squares | Shop Drafting Templates | Shop Drafting Pencils & Leads | Shop Drafting Paper | Shop Portable Drafting Boards
