Project planning guide
Before you build
Use the reference image and planning notes as a starting point. Confirm dimensions, loads, materials, local codes, and site conditions before purchasing or cutting.
- Type of Wood Joints
- 10 reference images
- Print-friendly guide
Miter joints meet on angled faces, commonly two 45-degree cuts forming a 90-degree corner. These ten examples focus on three visually verifiable approaches—plain, spline-reinforced, and keyed miters—across common frames, boxes, trays, and cabinet corners.
Quick answer: This guide shows ten separate, labeled examples related to miter joint. Study the mating faces, shoulders, grooves, fasteners, and direction of assembly before choosing a joint for a real project.
10 examples in this guide
- Plain Miter Picture Frame
- Plain Miter Box Corner
- Glued Miter Trim Corner
- Spline Miter Box Corner
- Spline Miter Picture Frame
- Spline Miter Tray Corner
- Keyed Miter Box Corner
- Keyed Miter Picture Frame
- Keyed Miter Tray Corner
- Keyed Miter Cabinet Corner
1. Plain Miter Picture Frame
What to notice: Matching 45-degree faces make a clean picture-frame corner.
Typical uses: picture and mirror frames.
Dry-fit check: Confirm that mating parts are complementary, shoulders close evenly, and the parts assemble in the intended direction without forcing.
2. Plain Miter Box Corner
What to notice: A plain box miter hides both boards' end grain from the outside.
Typical uses: light boxes and cases.
Dry-fit check: Confirm that mating parts are complementary, shoulders close evenly, and the parts assemble in the intended direction without forcing.
3. Glued Miter Trim Corner
What to notice: Accurate cuts and clamping are essential when glue alone carries the corner.
Typical uses: trim and moldings.
Dry-fit check: Confirm that mating parts are complementary, shoulders close evenly, and the parts assemble in the intended direction without forcing.
4. Spline Miter Box Corner
What to notice: A spline adds alignment and long-grain gluing surface.
Typical uses: boxes and cases.
Dry-fit check: Confirm that mating parts are complementary, shoulders close evenly, and the parts assemble in the intended direction without forcing.
5. Spline Miter Picture Frame
What to notice: A concealed spline reinforces a narrow frame without changing its outer line.
Typical uses: picture and mirror frames.
Dry-fit check: Confirm that mating parts are complementary, shoulders close evenly, and the parts assemble in the intended direction without forcing.
6. Spline Miter Tray Corner
What to notice: A spline can reinforce and decorate a tray corner at the same time.
Typical uses: trays and shallow boxes.
Dry-fit check: Confirm that mating parts are complementary, shoulders close evenly, and the parts assemble in the intended direction without forcing.
7. Keyed Miter Box Corner
What to notice: External keys bridge the miter and create a visible accent.
Typical uses: decorative boxes.
Dry-fit check: Confirm that mating parts are complementary, shoulders close evenly, and the parts assemble in the intended direction without forcing.
8. Keyed Miter Picture Frame
What to notice: Keys add mechanical resistance where wide frame miters tend to open.
Typical uses: wide picture and mirror frames.
Dry-fit check: Confirm that mating parts are complementary, shoulders close evenly, and the parts assemble in the intended direction without forcing.
9. Keyed Miter Tray Corner
What to notice: Flush keys strengthen a shallow mitered corner without internal hardware.
Typical uses: serving trays and organizers.
Dry-fit check: Confirm that mating parts are complementary, shoulders close evenly, and the parts assemble in the intended direction without forcing.
10. Keyed Miter Cabinet Corner
What to notice: Multiple keys spread reinforcement along a wide case corner.
Typical uses: small cabinets and display cases.
Dry-fit check: Confirm that mating parts are complementary, shoulders close evenly, and the parts assemble in the intended direction without forcing.
Before you cut the joint
- Mark a reference face and edge on every workpiece.
- Make a full-size sample from scrap of the same species and thickness.
- Dry-fit before glue and inspect cheeks, shoulders, end grain, and movement clearance.
- Use guards, hold-downs, eye protection, dust control, and the tool manufacturer’s instructions.
- Use engineered drawings for load-bearing timber, roof, stair, deck, or structural connections.
Frequently asked questions
Can I copy dimensions from these photos?
No. The images explain orientation and connection type only. Size the joint from the real stock, load, species, and verified plan.
Why make a test joint?
A scrap test reveals cutter width, setup error, grain behavior, and fit before the final component is damaged.
Should a dry joint need heavy force?
No. It should close with controlled hand pressure or light tapping appropriate to the design. Excessive force can split cheeks, pins, tails, or shoulders.
More wood-joint guides
Browse the Type of Wood Joints hub, or continue with 10 Tongue-and-Groove Profiles and Project Uses, 10 Box Joint Variations and Project Uses, 10 Ways to Reinforce a Butt Joint.
