Biter Blade Replacement: The Pass-Through Pin That Doubles Your Cutting Distance
Nibbler blade replacement is the part of the job nobody looks forward to. The pin wears out mid-project, and now you're hunting for the right tool, fighting with parts, and losing time you don't have. The Bad Dog Biter was built to take most of that pain out of the job.
Here's what makes the Biter's pass-through blade assembly different, how to swap a pin in a few simple steps, and how the lifetime guarantee keeps you cutting.
Why Nibbler Pins Are a Pain to Replace
A nibbler earns its keep on sheet metal, but the cutting pin is a wear part. Eventually it gets replaced. On a lot of tools, that means a fussy teardown that eats into your day.
The Biter takes a different approach. Instead of building the pin swap around a complicated assembly, we built it around one simple idea: pass the blade straight through.
What "Pass-Through Blade Assembly" Means
Look at the Biter and you'll see a biter pin and a cutting head up top. Down below, under the carrying handle, there's a second head. The pin runs all the way through.
That's the pass-through blade. One pin, two cutting heads, and a design that makes the pin easier to replace than any other nibbler on the market.
Twice the Cutting Distance: 2,000 ft Per Head
Two heads means double the life from every pin. You get about 2,000 ft of cutting from the top head and another 2,000 ft from the bottom. That's in 18-gauge mild steel, the regular sheet metal you see on everyday jobs.
For anyone cutting a lot of sheet metal, that's a lot fewer stops to change a pin and a lot more time cutting.
How to Replace the Pin, Step by Step
Replacing the pin on the Biter takes a few simple steps:
- Loosen the center set screw and the grub screw inside it.
- Pass the blade through. It's as simple as sliding the new pin down through the assembly.
- Check the detent. You'll see a small detent on the pin. Make sure it's facing up.
- Tighten back up. Snug the screws down and the pin is completely replaced.
That's it. No teardown and no special setup, just loosen, pass through, align and tighten.
Quick Reference
- Cutting distance: about 2,000 ft per head (top and bottom)
- Material rating: 18-gauge mild steel
- Pin swap: loosen the center set screw and the grub screw, pass the blade through, detent facing up, tighten
- Warranty: lifetime guarantee
Lifetime Guarantee: Send the Old Pin Back
When a pin is done, don't toss it. Send the bad pin back to us and we will send you a brand new one under the lifetime guarantee.
We've been making tools in Bristol, Rhode Island since 1988, and we're still family-owned. Standing behind our products is how we've done business for more than 40 years.
Ready to Cut? Get the Bad Dog Biter
You can buy the Biter today at baddogtools.com. If you'd rather see it in person, find us at any of the 250 trade shows we do across the country every year.
Less Bark, More Bite.
Get the Bad Dog Biter, backed by our lifetime guarantee.
Shop the Bad Dog BiterQuestions? Call 800-252-1330
Frequently Asked Questions
How do you replace a nibbler pin?
On the Bad Dog Biter, loosen the center set screw and the grub screw inside it. Then pass the new blade down through the assembly, with the detent facing up. Tighten the screws back up and the pin is replaced.
How far will a Bad Dog Biter cut before it needs a new pin?
You get about 2,000 ft of cutting from the top head and another 2,000 ft from the bottom head, in 18-gauge mild steel. That's the regular sheet metal found on everyday jobs.
What is a pass-through blade on a nibbler?
It's a pin that runs all the way through the tool, with a cutting head on top and a second head below the carrying handle. Two heads give you twice the cutting distance from one pin.
What happens to the old pin?
Send it back to Bad Dog Tools under the lifetime guarantee, and you're good to go for another 2,000 ft of cutting.
Where can I buy the Bad Dog Biter?
Order at baddogtools.com, or pick one up at any of the 250 trade shows we attend across the country every year.
Written by Joseph Strong on 1st Oct 2026 I’m JJ Strong, a mechanical engineer and third-generation tool designer at Bad Dog Tools, our American-made, family-run company built on durability and innovation. I grew up hauling booths and talking tools at trade shows before I could even drive. Now I design and build and improve our next generation of lifetime-guaranteed tools - our custom induction brazing system to our precision sharpening technology. On weekends, you’ll find me restoring my ’86 Land Rover Defender or ’54 Jaguar XK120 and seeing just how much I can build (or break) with Bad Dog Tools.