Security Test Lab
Butterfly vs. Rubber vs. Locking: The Grip Strength Test Results
There is nothing worse than losing a favorite pin. We used a digital force gauge to find out which backing actually holds on tight.
By Minghui Crafts Team•January 16, 2026•5 min read
"My pin fell off my backpack!"
If you sell pins, this is the #1 customer complaint. To help you choose the right backing for your product, we tested the three most common options:Butterfly Clutch, Rubber Clutch, and Deluxe Locking Back.
Pull-Force Test Results
We measured the force required to pull the backing straight off the pin post without releasing the mechanism.
| Backing Type | Pull Force (lbs) | Comfort | Best Use Case |
|---|---|---|---|
| Butterfly Clutch (Metal) | 3.5 lbs | Low (Scratches skin) | Jackets, Hats (Low movement) |
| Rubber Clutch (PVC) | 5.2 lbs | High (Soft against skin) | Shirts, Lanyards (Skin contact) |
| Deluxe Locking Back | 30+ lbs (Locked) | Medium (Bulky) | Backpacks, Bags, Heavy Coats |
Butterfly Clutch
The industry standard. Cheap and effective for display.
Pros:
- ✓ Lowest Cost (Free)
- ✓ Classic Look
Cons:
- ✗ Prongs can bend
- ✗ Loosens over time
Rubber Clutch
The modern favorite. Tighter grip than metal butterfly.
Pros:
- ✓ Comfortable (No scratching)
- ✓ Won't bend or rust
Cons:
- ✗ Can be pulled off
WINNER
Locking Back
Internal spring mechanism locks onto the post groove.
Pros:
- ✓ Impossible to pull off
- ✓ Premium feel
Cons:
- ✗ Costs +$0.30/ea