Snap Button Size Chart: Complete Measurement Guide (mm & Ligne)
Complete snap button size chart with mm and ligne conversions. Learn how to measure snap buttons correctly and find the right size for jackets, baby clothes, leather, and more.
Getting the right snap button size is crucial — too small and it won't hold, too large and it looks awkward. This guide provides a complete snap button size chart with millimeter and ligne conversions, plus expert advice on which size works best for each application.
In This Guide:
- Understanding Snap Button Sizing
- Complete Size Chart (mm to Ligne)
- How to Measure Snap Buttons
- Size Recommendations by Application
- Snap Button Components and Dimensions
- Choosing the Right Size for Your Project
1. Understanding Snap Button Sizing
Snap buttons are measured by the outer diameter of the cap (the visible top part). Two measurement systems are used in the industry:
Millimeters (mm)
The standard metric measurement. Most commonly used worldwide. Measures the cap diameter directly.
The standard metric measurement. Most commonly used worldwide. Measures the cap diameter directly.
Ligne (L)
A traditional French measurement used in the button industry. 1 ligne = approximately 0.635mm. Still widely used in Europe and trade.
A traditional French measurement used in the button industry. 1 ligne = approximately 0.635mm. Still widely used in Europe and trade.
Quick Conversion Formula: To convert ligne to mm, multiply by 0.635. To convert mm to ligne, divide by 0.635. Example: 24 ligne × 0.635 = 15.24mm ≈ 15mm snap button.
2. Complete Snap Button Size Chart
| Size (mm) | Size (Ligne) | Cap Diameter | Common Use |
|---|---|---|---|
| 8mm | 12.5L | 8.0mm | Baby clothes, miniature items |
| 9.5mm | 15L | 9.5mm | Baby bodysuits, children's knitwear |
| 10mm | 16L | 10.0mm | Shirts, blouses, light garments |
| 10.5mm | 16.5L | 10.5mm | Standard garments, accessories |
| 12.5mm | 20L | 12.5mm | Medium garments, bags, wallets |
| 15mm | 24L | 15.0mm | Jackets, leather goods, handbags |
| 17mm | 27L | 17.0mm | Heavy coats, outerwear, workwear |
| 20mm | 32L | 20.0mm | Heavy-duty, marine, upholstery |
| 25mm | 40L | 25.0mm | Decorative, large closures, canvas |
Pro Tip: The most popular snap button sizes for garment manufacturing are 15mm (24L) and 12.5mm (20L). These sizes provide a good balance of appearance and holding strength for most clothing applications.
3. How to Measure Snap Buttons
To measure a snap button correctly, you need to measure the outer diameter of the cap using a caliper or ruler:
Step-by-Step Measurement:
- Take the cap piece — the decorative top part of the snap button
- Place a caliper across the widest point of the cap (diameter)
- Read the measurement in millimeters
- Match it to the size chart above
Important: Always measure the cap diameter, not the socket or stud. The socket (the piece that receives the stud) is typically 1-2mm smaller than the cap. If you measure the socket, you'll order the wrong size.
4. Size Recommendations by Application
| Application | Recommended Size | Snap Type | Why This Size? |
|---|---|---|---|
| Baby bodysuits | 9.5mm - 10mm | Prong snap | Small, gentle, easy to open |
| Children's jackets | 10mm - 12.5mm | Spring snap | Proportional, secure hold |
| Shirts & blouses | 10mm | Spring or sewing | Discreet, lightweight |
| Adult jackets | 15mm | Spring snap | Standard industry size |
| Leather bags | 12.5mm - 15mm | Spring or ring snap | Strong hold, elegant look |
| Heavy coats | 17mm - 20mm | Ring snap (gripper) | Maximum strength needed |
| Marine / boat covers | 15mm | Stainless steel | Rust-proof, strong |
| Denim / jeans | 15mm - 17mm | Spring snap | Durable, classic look |
| Workwear / uniforms | 17mm - 20mm | Ring snap (gripper) | Heavy-duty, reliable |
5. Snap Button Components and Dimensions
Every snap button consists of four parts, and each part has specific dimensions that must match:
| Component | Position | Function | Key Dimension |
|---|---|---|---|
| Cap | Top (visible) | Decorative surface, logo area | Outer diameter |
| Socket | Top (underside) | Receives the stud, spring mechanism | Inner diameter |
| Stud | Bottom (visible) | Protruding knob that clicks into socket | Stud height |
| Post | Bottom (underside) | Secures stud to fabric | Post length |
Critical: All four components must be from the same size and same manufacturer. Mixing parts from different sizes or brands can result in weak closures, fabric damage, or snap failure. Always order complete sets.
6. Choosing the Right Size for Your Project
Here's a simple decision framework to find your ideal snap button size:
Consider the Fabric Thickness
Thicker fabrics need larger snaps (15mm+) for proper engagement. Thin fabrics work best with smaller snaps (8-12.5mm) to avoid bulkiness.
Thicker fabrics need larger snaps (15mm+) for proper engagement. Thin fabrics work best with smaller snaps (8-12.5mm) to avoid bulkiness.
Consider the Stress
High-stress closures (front of jacket) need larger snaps. Low-stress positions (pocket flaps, cuffs) can use smaller sizes.
High-stress closures (front of jacket) need larger snaps. Low-stress positions (pocket flaps, cuffs) can use smaller sizes.
Consider Aesthetics
Larger snaps are more visible and decorative. If you want a subtle look, choose smaller sizes or color-matched finishes.
Larger snaps are more visible and decorative. If you want a subtle look, choose smaller sizes or color-matched finishes.
Consider the End User
Baby clothes: small, easy-open snaps. Elderly/arthritis: larger snaps for easier grip. Heavy-duty: maximum size for strength.
Baby clothes: small, easy-open snaps. Elderly/arthritis: larger snaps for easier grip. Heavy-duty: maximum size for strength.
Related: Types of snap buttons guide | Browse snap buttons by size | Wholesale pricing | Request sample kit
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