Introduction: How to Make a Flash Bang (Flash Grenade)

Picture of How to Make a Flash Bang (Flash Grenade)

this instructable will teach you how to make a quick and easy Flash Bang.
this was not my idea, i found it on youtube.
WARNING: while using a Flash Grenade, it is a very good idea to wear non-flammable gloves, and sunglasses.
DISCLAIMER: If you end up hurting yourself or others or setting something on fire, then I take no responsibility for it.

Step 1: Materials

Picture of Materials

What you need:
Two cigarette lighters, (a small bic one is fine)
the other one is to heat the flint up.
Gloves (optional)
Sunglasses (optional)

Step 2: Destruction!

Picture of Destruction!

Pic 1: take the bic lighter and the pliers, then push the plier into the hole where the flame comes out, then pull of the metal covering.
It should look like the second picture.

Step 3: The Barrel

Picture of The Barrel

once again using the pliers, slowly pull the barrel off. there is a flint with a spring under it and the flint will shoot out, so be careful, because the flint is the most important part.

Step 4: The Flash Itself

Picture of The Flash Itself

Now the flint and the spring will be revealed.
Strech the spring so its relatively long, then wrap it around the flint.
CAUTION: make sure that the flint is very secure in the spring so that when you pull your arm back to throw it you don't end up setting your pants on fire.

Step 5: Using It!

Picture of Using It!

If you chose to get some gloves or sunglasses, this is where you should put them on
It is also a good idea to decide where you are going to throw it, and make sure that nothing is highly flammable around the area you are going to throw it at.
-SAFETY WARNING TIP: I did this under adult supervision, and when you throw it, it would probably be safer not to pull your arm back past your ear, but to do a small underarm throw, and I would higly reccomend wearing entirely wool clothing.-
And I also reccomend having a hose, or a bucket of water at hand.
Get the other lighter and hold the Flint Over the naked flame.
When it turns Red hot, then throw it!
(the one in the video wasn't so impressive because it cooled down a lot when I took pictures of it red hot)

If you are this crazy, hold it over the flame till it is white hot, then shoot it out of a bb gun.


DavidD477 (author)2017-09-02

This is not a flashbang it's just a piece of burning ferrocerium. You can buy six inch rods of the stuff online instead of having to pull apart lighters, I have a few ferro rods for lighting campfires. Lighting magnesium ribbon (again, cheap and easy to get online) would have the same effect.

Flash powder (you might be able to get this online, check suppliers for antique photography equipment) will have a much better effect, for the bang all you need is black powder in a tightly sealed card tube.

For an actual flashbang you will need:
One coke or beer can, a food can is fine too
Flash powder
Black powder
Duct tape
Clear tape
A few boxes of matches
Safety fuse

Assorted tools, a leatherman or swiss aemy knife will do.

Using an awl punch holes in the can until it looks like it's been hit with birdshot.
Cut the top off the can

Make a tube out of the card, big enough to hold about 10-20g of black powder, leave the top open

Cut about 5 seconds of safety fuse, cut six strands of 5 seconds of fuse

Cut the match boxes apart so you have the strikers available

Sandwich two matches in between two striker pads along with two strands of 5s safety fuse. Do this three times.

Attach the cordage to the striker pads using duct tape

Fill the tube with black powder and separate the fuse from each match striker into the black powder, secure toghtly with duct tape. The tighter it's sealed, the louder the bang.

Reverse duct tape around the card tube so it becomes sticky and generously apply flash powder to it, secure the other three fuses and flash powder in place with clear tape.

Insert into can so it is in the middle of the can, not at the edges

Tape the top onto the can with the cordage coming out the hole that the ring pull makes

Pulling sharply on the cordage strikes the matches (you use three in case one or two fail to ignite), which lights the fuses. You have about five seconds before it goes off.

Flashbangs can cause severe burns and/or shrapnel injuries if handled/made incorrectly. Check local law before making this. Don't attempt to make your own fuse.

ryan.sample.568 (author)2015-04-16


This Instructable can easily end up maiming you or someone else. It's not recommended that you try it.

Circl2s. (author)ryan.sample.5682016-12-05

same ima do it too

cool ima do it

Ysbeer4 (author)2016-09-17

So does it explode on contact?

candaattheshore (author)2016-02-05

Sounds great to scare away black bears at my house

JeffS113 (author)2015-12-27

thats a flint bomb not flash bang

Doc Penguin (author)2015-11-30

im gonna get 5 flints from lighters

İll post a vid when im done.

lolman25 (author)2015-11-03


jlee170 (author)2013-11-18

That's simple, all right, but it works more like a firecracker. I was looking for something more explosive. Lame in my way, cool in others. Nice firecracker, bro.

Skrubreker (author)jlee1702015-10-22

Well it isn't supposed to be an explosion it is supposed to be like a flash...

5784codyclark (author)2015-08-30

I made it and it work like a charm thumbs up dude

GoCrazy (author)2009-08-06


Lateral Thinker (author)GoCrazy2009-08-07

Right what? GoCrazy?

You try those links too

I will be watching for your next instructable (I just subscribed to you)

:-) Peter.

:O sry that was my other acount i'm Visper123, that wasn't meant to be related to anything which was spoken about here.

Will the real Visper stand up please, of cause you are Visper, thats your ID, should not GoCrazy be saying he is Visper?

Whatever, I am going crazy myself with that apparent paradox. . See you later.

gocrazy is my other account.

Multiple personalities then? :-) What next? Should I look up your projects under GoCrazy?

Is there a 3rd personality? Could it be its just you and me on Instructables?

no i frgot my password once so i made a different account. gocrazy is my other 1 but i don't use it anymore

Creative thinking. how about a Instructable for that?


for making a eco friendly lighter? (which dont use gas), I need a broken old computer to make it. (sry, no more details, I'm trying to keep it secret so I can get credit.)

Try where I get stuff from. My friends work there, we call the place affectionately "Trash" but its high up above the city which is at sea level, so gets very cold in winter. The apparent mural to the right of the picture is the truck that collects materials, each household gets 2 per year, but me and friends living near each other share pick ups. People also drop off materials.

About 100 Km north of here, at Palmerston North, their recycling gives everything to local charity shops to on-sell, but apparently, they have a large warehouse just to on-sell recycled computer parts.

So, when will you be arriving in NZ then? PS we are 12 hours ahead of GMT/UTC here, bedtime for me shortly.

you are in NZ? I might be going there in a few weeks.

By now, you will be persona non gratis or whatever, very likely our SIS is already gearing up, and no doubt they got a whole file on you by now. NO Flash Bangs please. (We got enough as our kids have already built thousands since you published your instructable.)

Doug5846 (author)Lateral Thinker2015-08-25

Dude. Your annoying as hell, please shut the hell up and stop harassing people

you r jokin yeah?

Anybody with an interest in explosives bears watching. And our kids did not need your instructable to built Flash Bangs, they had a whole industry building them here, before you were even born. Suggest on your profile Orangeboard to delete that welcome message. If in the future you forget what it says, just go find another beginner, that forgot to delete hers, and read that one.

what welcome message?

On your profile, the following has a delete button, mine had, before I deleted it. And I am unable to delete yours for you obviously, BTW, the following I copied from your profile, and pasted here. (sorry for any delay in answering) Jun 2, 2009. 5:44 AMInstructables Robot says: Hello! Welcome to Instructables! I am the Instructables Robot. My job is to alert you whenever someone leaves you a comment or sends you a private message. I spend most of my day sending email. I like sending email. You probably want to upload an image to your profile. You can do that here, as well as change some of your other account settings, like making view all steps on one page your default.

No way will you ever get credit for something nobody knows about.

But delay too long, somebody will beat you to it, and take the credit.

Seeing you just put the basic idea into the public domain, there are now at least 50 people racing to beat you.

Try this test is my new forum, I bet if you do it honestly, the picture will have a peak on compulsion, pointing left or right, question is which. My should weight towards the right.

Damn it, but mine is a certain type which I think it might take a while to figure out

mrademeyer1 (author)2014-08-16

hi there thanks for the info but this one is not so useful as one you shoot out a pellet or one like grenade that you throw but i was thinking of using magnisium lint or similar

Lateral Thinker (author)2009-08-06

Becuase usage of this instructable can maim people for life, and damage property, and similar ideas have already done so, I for one don't think it is appropriate to have here, few people would be brave enough to tell you that, so thats your answer to,

"How come no ones commenting?"

Despite your warnings and disclaimers, when somebody does get hurt by use of your instructable, you will still be morally responsible if not legally responsible.

Could you live with yourself, knowing somebody has been maimed for life?''

I note this is your first attempt, I suggest you can do a lot better, with a more appropriate topic, and I will watch out for it, in case you deserve a lot nicer comment than this one.

Have a great day.

How could he be morally and legally responsible? The question focuses more-so on the latter. You can go anywhere on the internet for information on how to do any number of things, but the reader makes the decision on whether or not to use the information in a positive or negative way.

It seems to me that there is a difference between informing and "putting the gun in the hand, loading, cocking, and aiming it", so to speak.

Furthermore, if the reader is dumb enough to attempt something dangerous with a disclaimer, then why should Visper feel bad if they maim themselves?

it depends on if you have a conscience mate, how would you feel in your own mind?

But that only would go as far as morally responsible.

morally responsible >>>>>>>if not legally<<<<<<<<<

I'm still a bit lost here, or perhaps you are. How could he considered legally responsible for this? I get the morally, and I don't agree with it, but that's moot as of now. In what way could he possibly be legally responsible?

Insaneisfun (author)xACIDITYx2009-08-19

He said he wasn't legally responsible but most would find themselves morally guilty if someone was harmed.

xACIDITYx (author)Insaneisfun2009-08-20

Actually he said morally, if not legally.

Actually my English meant, if he was not HELD legally responsible, he would still in his own mind be morally responsible.

Stop flogging a dead horse Skate, in my mind, Visper has more common sense than you because he understood what I meant first go.

He is from Auz, I am from NZ, and its you jokers whom bombed Japan with the first A-bomb, when Japan were goners already, in affect, your people PLAYED with the biggest most destructive bomb ever, just to see what it could do. All that was needed to end the war, was to blockade Japan until they decided to surrender, no invasion was needed at all.

The USA itself decided it was legal to drop the bomb on civil ins, babies, 5-years olds, 10-year olds, but still a lot of your citizens decided they (The USA) were morally responsible, and more than one nuclear scientist felt so bad about the number of civilians babies and kids killed, that they killed themselves in remorse, holding themselves morally responsibly, if not legally responsible.

So let me get this straight, you condemned the acts of America ending WW2 with a bomb, and by doing so you commend the acts of Japan killing thousands of NEUTRAL U.S. Sailors. In my opinion, Japan itself (who the general of Japan even said) "Woke a force they cannot quell"

hey, I'm not australian, i just live here. I'm actually from London.

~Aeronous~ (author)~Aeronous~2009-08-23

Oh and I'm not 15, I am 11, but to have an account you need to be over 14.

uberzombiebob (author)~Aeronous~2010-07-28

good for you i'm 12 and from gloucester which unless you have a brain you will never have heard of. but since you do have a brain why don't we fight this control freak together.

~Aeronous~ (author)uberzombiebob2010-07-29

Haha, Gloucester in England, I AM from england, and I do have a brain, and that was one year ago, and I am 12, and he has aspergers syndrome, and I made friends with him, and we settled on the argument, and he managed to persuade me to post a christmas tree.

I am also the Instructables Robot, you just in effect, pleaded guilty. The process now is that you kindly resign. Its kids like you, trying to sign up for the Army, at the beginning of WW2 by understating your age, that got the world into the mess it is today. Come over to the Aspie forum, we are discussing dust explosions.

I don't want to be in the army though

No way will they have you, if you tell them you enjoy making bombs, the Army is all about peace keeping now. But, the Army just said this morning, if they have to keep the peace in school play grounds, then the Air Force had better reactivate our Skyhawk squadron in case the Army has to withdraw and RUN for their sanity. :-) NZ, due to normal wear and tear, (training crashes) NZ bought up all the Auz Skyhawks when Auz got rid of their one Aircraft carrier Sydney, luckily they were the same model and era. Now NZ is trying to sell them, but the USA has to approve the buyer of '60s technology.

Dude, what's your problem? It's just a project and the reader should know that when there's a disclaimer, you could possibly get hurt . Why should the author have moral responsibility? And most people do know what a conscience is. Fewer people, though, have what is called common sense. Common sense is necessary when starting any sort of project, as it alerts you to the obvious dangers of said project.

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