Question about Stanley Fatmax Xtreme Retractable Utility Knife

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Just purchased a Stanley FatMax 10-778 retractable knife. Cannot figure out how to load the blade for use.

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1. Make sure the side lock is unlocked.
2. Push the thumb tab all the way to the front of the blade handle.
3. Insert the blade in the opening, you may notice two notches on the top side of the blade.
4. Press the small blade release button as you slide the blade into the knife. You may have to jiggle up and down to get the two notches on the blade fully into the handle.

If properly inserted, the exposed area of the blade should look very close to an equilateral triangle.

make sure both notches of the blade are inside the handle. They notch into the thumb lever.

good luck

Posted on Apr 11, 2010

Testimonial: "Thanks so much!"

  • 4 more comments 
  • HouRon Sep 04, 2010

    The above solution worked. Just seems like a very unsafe way to install a very sharp blade. What were they thinking?

  • franjow Sep 10, 2010

    Brilliant! Bought a Fat Max some time ago and had forgotten how to change the blade. So simple when you know how! Thanks

  • smilinjim Nov 29, 2010

    Thanks for solving the mystery. What a terrible design from a company that has always had straightforward tools!

  • donschneider Dec 22, 2010

    Bad system, too dangerous, too easy to loose grasp of "treated" blade installation ! Stanley can do better than this ! don schneider havana fl.

  • howlandpines Mar 06, 2011

    The instructions on the unit are terrible, How hard would it have been for Stanely to put your 4 steps on the box, thank God for the internet at these moments. Thanks!

  • hgrPhotograp Sep 15, 2011

    I'm glad this was posted. I was ****** having spent $11 with tax and not having what seemed to be a special tool required. Piece of cake. Time to cut some carpet in my photography studio (www.pbase.com/hgr_photography

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What a wonderful way to slice your fingers and jab a hole in your hand!!!!! This tool must of been added by an engeneer dropout!!!! A real utility knife would of had a "flip-open side; drop all the blades in; close the side; and it would automatically load when you slide the slider at the top.

Posted on Sep 25, 2011

  • mark Dec 09, 2011

    It was easy if you just follow the simple directions above. You don't even know how to spell Engineer.

  • chrishodyl
    chrishodyl Jan 20, 2013

    This engineer agrees that this is a stupid and dangerous design. I can see that it is very easy to slice open you finger. What the hell is the screw there for anyway if you can't open it up?

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This is a poor design. We have one that is loaded, but now it's stuck and we can't remove the blade. Dangerous design...

Posted on Jun 17, 2012

  • Calvin Swoager Dec 31, 2012

    In a agreement that the design is not the greatest. But to remove the blade, 1) unlock, 2) press button oppisite of unlock, 3) pull the blade out (you may want to use a tool to grab blade.

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1 Answer

How do I remove the original packaging from the fatmax


I agree. The packaging is ridiculous.
I removed it by grasping the packaging and pulling (very hard) from the blade end (bottom left as looking at it) straight out. This stretched and tore the plastic "paper" and pull the knife free.

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Jul 30, 2012 | Stanley Fatmax Xtreme Retractable Utility...

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How to open stanley fatmax knife 10-778 TO CHANGE THE BLADE. thank you


How do I change the blade on the quick change/instant change knife? Warning: Blades are sharp and can cause serious injury. Be extremely careful when handling blades. Wear eye protection and dispose of used blades properly, such as wrapping in duct tape.


FULLY EXTEND THE BLADE.

Press down and forward again on the slide button until the button is in the full front of the top slot (0 through 3 in the below picture).

Note- the blade must be extended beyond the 3rd detent position. This will cause the slide button to remain in a down position, allowing the blade release button to operate.

PRESS AND HOLD THE BLADE RELEASE BUTTON ON THE FRONT SIDE OF THE KNIFE. (Step 4 in the below picture)

Note- if the blade is not fully extended beyond position 3) , the blade release button will not work.

Remove the old blade carefully.
Insert new blade.

NOW, RELEASE THE BLADE RELEASE BUTTON.
ENSURE THE BLADE IS LOCKED IN PLACE. If the blade does not retract, try carefully giving a slight tug on the blade to reseat.

Jul 13, 2011 | Stanley Fatmax Xtreme Retractable Utility...

1 Answer

I have a stanley FatMax. How do I insert the blade into the case?


On the side there is a big gold wheel, twist counter clockwise and the case should split in half, the blade is held by a magnet, prise the old blade off and replace with new one, then put case back together and tighten gold wheel clockwise
Goodluck!

Mar 06, 2011 | Stanley Fatmax Xtreme Retractable Utility...

1 Answer

Describe how you put a blade in FatMax model 10-778


The model in your picture is a fixed blade utility knife (model 10-816). Your question asks for instructions for model 10-778, which is a retractable knife. I'll guide you through the 10-778 which you asked for, if you need instructions for the pictured 10-816 please re-post the question.

Push the thumb slide forward as far as it goes exposing the blade. Press the blade change button on the side of the knife (the small button on the left side near the blade) and pull out the old blade.
Insert the new blade and slide thumb slide back to fully engage blade in the internal lock.

Dec 26, 2010 | Stanley Fatmax Xtreme Retractable Utility...

1 Answer

Cant put the thing back together after putting in new blade !!!fat max knife


some stanley knifes require stanley blades only, or make sure the clip blade is in is seated in the grove completely.

Dec 23, 2010 | Stanley Fatmax Xtreme Retractable Utility...

1 Answer

I cannot open the Stanley FatMax Retractable Knife. The directions do not show how the blade is installed.


Try this website and scroll down to product description...

http://www.amazon.com/Stanley-10-777-Locking-Retractable-Utility/dp/B00009OYFP

Jan 30, 2010 | Home Fencing

1 Answer

I brought a stanley fatmax retractable knife, have no idea why the blade is not coming out, trying to figure out if i did something wrong like putting the blade in the wrong spot.. this is the only time...


Are you using Stanley Blades or off brand? Hey, I use off brand but sometimes it does make a difference. Second, make sure the blade slider is clean. If you were cutting shingles, for instance, the tar gets in there and screws things up.. try WD-40 spray it liberally all over the blade slide and buttons. If that doesn't work and you purchased it at a Menards store, I can speak of experience they'll replace it no hassle.
I hope I helped

Jan 09, 2018 | Stanley Fatmax Xtreme Retractable Utility...

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