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FireSteel Bunker 4.0

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  • The Bunker Junior is a very beefy FireSteel and is the same FireSteel.com FireSteel that goes into our FireSteel Tubes
  • The Bunker Jr FireSteel diameter compared to a US penny.

Need more than 500? Select 500, then go back to the product listing and add as many more as you need. We've got you covered.

 Product Description

The FireSteel Bunker Series by FireSteel.com are 1/2 of an inch thick.

The Bunker 4.0 FireSteel is 1/2-inch in diameter and 4-inches long.  For those who are serious about kindling plenty of blazes, enjoy a thick firesteel but do not feel the need to carry a 5 or 6 inch long Bunker FireSteel, the 4 inch long Bunker Junior will make many thousands of fires for you.


  • Size: 1/2 inch diameter by 4 inches long
  • Weight: 2.98 ounces
  • Robust 5500 F (3000 C) sparks that will start a fire in the toughest conditions
  • Composition: FireSteel.com ferrocerium rod


  • Genuine FireSteel.com FireSteel.
  • Enough FireSteel to make possibly ten thousand fires (we don't know how many, we have never worn one out!).
  • Huge robust sparks that you expect from a FireSteel.com FireSteel
  • Easy to use and very safe (Common sense required when using any firemaking gear).
  • Premium FireSteel.com firesteel formula that takes your firesteel firemaking to a whole new level
  • 5500 F (3000 C) sparks that will start a fire in the toughest conditions

Related FireSteel

Get your FireSteels from THE name in FireSteel: FireSteel.com!

* Bunker FireSteel and FireSteel Bunker are trademarks of FireSteel.com

 Other Details

Weight Comparison:
Approximately 5.4 FireSteel Rods per Pound of Weight

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 Product Reviews

  1. Around My Neck Right Now

    Posted by Matt on Feb 3rd 2017

    I tied a piece of Type III Nylon (para-cord) to this fire steel using a constrictor knot. I always carry a knife, along with a small piece of fatwood in my pocket. This is a more sure fire method of starting a fire than strike anywhere matches, or even a zippo. Less to go wrong. This was my first order, and I am impressed with the product, as well as Ron's customer service. You've got a lifetime customer on your hands.

  2. Excellence

    Posted by K C on Jul 25th 2016

    Ordered the 4"x1/2" rod. Was delivered in a very timely manor. Gotta say, I mounted this rod in an elk antler as a handhold and this rod throws lightning bolts and fireballs!! Seriously, its a great product and I will be ordering more of them for my other kits

  3. Now this is a Firesteel!

    Posted by Don on Dec 15th 2015

    This rod is spark city! Great size (I got the 4") and will last a long time as you don't need to scrape it as much to start a fire.

  4. Very good fire steel

    Posted by Unknown on May 28th 2015

    These are very good fire rods that throw a lot of sparks to make a fire easily provided you have the right fire tender.

    Tip: If you somehow end up without a fire rod striker you can break a rock by using another rock to bash the rock against it until you have a rock with a sharp edge and then use the sharp edge of that rock to strike your fire rod.

  5. FireSteel Bunker 4.0 / Wind / Cotton Ball with Vaseline

    Posted by S. Maxson on Oct 5th 2014

    I received a FireSteel Bunker 4.0 about a week ago.Today I tested it under 15 mph windy conditions on open ground. I used a cotton ball with Vaseline petroleum jelly, a small amount mixed through the cotton ball. I used a pocket knife blade. ( 1 ) strike ignited the cotton ball. I am impressed! FireSteel fire steels are the best I have ever used and owned.

  6. Get one

    Posted by Unknown on Jun 13th 2014

    Got it on time and works great.

  7. Great Fire Steel

    Posted by Unknown on Jun 9th 2014

    The Bunker 2.5 x4" throws a great amount of sparks with a good knife.

  8. Great Ferro Rod!

    Posted by Unknown on May 2nd 2014

    I've heard so much about these over the past year and I finally ordered from them. When using the spine of my knife the sparks just come off and stay hot for several seconds. I also like that you can scrape small shavings off to get a pile like a magnesium bar for stubborn tinder. I'm curious to how long they last because I like playing with them just to see the sparks fall.

    I will order from firesteel.com again.

  9. Massive Amount Of Spark!!!

    Posted by Mule on Mar 24th 2014

    Headline says it all. You can almost warm yourself with the sparks. These things, I believe, would start a fire underwater!

  10. Great product

    Posted by Christopher M on May 24th 2013

    I am a wilderness survival and outdoor expert, I have used many different fire steels. None of them though can compare to the prices and the quality of firesteel.com fire steels.

  11. great product

    Posted by Unknown on Jan 3rd 2013

    I got 2 blank rods because my old old Armageddon was running low and getting warn out so I want to get 2 replacements it has last for over 2 years and many fires, I have not need to change out the rod yet, but when the time comes, I can

  12. "Replacement" back-up?? yeah Right!!

    Posted by Mark from Marietta S.C. on Dec 8th 2012

    I bought this as "back-up" blank rod for my Deluxe Bunker Firesteel Tube, or at least for the "steel" part. These Firesteels throw such a fit of screaming mutant lava-like sparks, its like they're "mad as hell going somewhere to happen" When you scrape a Firesteel Ferro Rod with some decent authoritative pressure...well...thats one of the few times you'll screw a cap back on the front door of Hades and live to tell about it

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