SKILSAW 15-Amp 7-1/4 in. Magnesium Worm Drive with Diablo Blade-SPT77WM-22 - The Home Depot
Message to Our Customers


Model # SPT77WM-22

Internet # 204955639

Store SKU # 1000043007

15-Amp 7-1/4 in. Magnesium Worm Drive with Diablo Blade

SKILSAW 15-Amp 7-1/4 in. Magnesium Worm Drive with Diablo Blade

This item has been discontinued.
The Home Depot no longer carries this specific product.

$199.00 / each


Model # SPT77WM-22

Internet # 204955639

Store SKU # 1000043007

The original worm drives SKILSAW, lighter and better than ever. At 3 lbs. lighter than the previous incarnation, this saw is built with rugged magnesium. Unstoppable durability meets lightweight ease for long days and a motor that stays cooler for years of heavy use. On top of our legendary worm drive, you get the best-in-class Dual-Field motor, engineered specifically by SKILSAW for saws. Just bolt on the included Diablo blade and even the toughest jobs don’t stand a chance. Also available with twist lock plug.

  • Lightweight magnesium construction (12.45 lbs. without blade, cord and wrench) reduces user fatigue for less down time
  • Dual-field motor is especially designed for saws; increases cooling and extends tool life
  • Durable die-cast magnesium foot has large easy-to-read bevel and depth-of-cut scales
  • 53° bevel allows for a wide variety of cuts
  • 24-tooth Diablo carbide blade included
  • Stay true guarantee: 180-day money-back guarantee plus 1-year limited warranty
  • Store may carry this saw under model SHD77M-22, same great saw, different model number and package
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Info & Guides

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Assembled Depth (in.) 
7.75 in 
Assembled Height (in.) 
9 in 
Assembled Width (in.) 
20.75 in 
Blade Diameter 
Maximum Cut Depth @ 90 Deg. 
Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 
Amperage (amps) 
Bevel Capacity 
Blade Location 
Color Family 
Cord Length (ft.) 
Corded Tool Type 
Circular Saw 
Depth Adjustment 
Electrical brake 
Keyless/keyed blade change 
Maximum Cut Depth @ 45 Deg. 
Maximum Speed (rpm) 
Power Tool Product Type 
Product Weight (lb.) 
12.5 lb 
Spindle Lock 
Tools Product Type 
Power Tool 
Warranty / Certifications
Certifications and Listings 
1-UL Listed,CSA Listed 
Manufacturer Warranty 
STAY TRUE guarantee: 180-day money-back guarantee plus one-year limited warranty 


Rated 5.0 out of 5 by 9 reviewers.
Rated 5.0 out of 5.0 by The undisputed king of the worm drive went on a diet and got lean I do a lot of fine woodworking. Generally circular saws don't have much place in fine woodworking - especially large, heavy worm drive saws. However nothing beats one of these for breaking down sheet goods to manageable sizes. I can stack plywood two 3/4" sheets deep and make a full 8' rip without so much as a whimper from this saw. Plus the weight is a benefit here. It cuts down on vibration and makes it really easy to track a straight edge. This saw in particular is something special: Pros - The sole is actually flat! This is been a major point of contention among worm drive saws in the 70+ years they have been around. I expected some work removing the sole and flattening it on a granite reference surface, but I didn't need to. The adjustments are wonderful and accurate. Very easy to read, everything locks and unlocks smoothly and everything moves as it should. This is something I am not accustomed to on a circular saw of any type. Both the bevel angle and max cut depth adjusters can be fined tuned which is often necessary with wear and tear. I was really glad to see this Power. If you are looking at worm drive saws, you already realize they are very powerful. However this not only powerful, but smooth. There is the tell tale torque twist when you first squeeze that trigger, but after that is very smooth. The included blade is actually nice! I am accustomed to not even installing the blade that comes with saws. Generally they are very low quality. This one is nice. I still purchase additional blades because I need a higher tooth count for my intended use, however for general construction in dry, nail free wood this blade is all you need. The ergonomics are great CONS Can't really think of any. As a lefty, this saw is a little awkward until you get used to it, but that is the nature of any worm drive. It is on the heavy side for a circular saw, but very light for a worm drive saw. Also be aware this saw requires maintenance. Especially oil and oil changes. If you want this saw to last, the oil should be changed after the first 10 hours of use, or within the first 3 months. As all of the gearing wears in some metal is shed and it's important to get it all out. Also if you ever overheat the saw, (common when cutting a lot of thick wet wood) change the oil. This saw has it all. Truly a 5 star performer. This is "the saw that built america". The performance is still as legendary as it was 70 years ago. It just got a lot lighter and easier to handle. This is a saw that my son will use with pride in 20 years June 13, 2014
Rated 5.0 out of 5.0 by Gutsy! This is a great saw with 15 Amperes of power. You feel the torque twist the machine as it starts! The first thing I noticed when unpacking this saw is the really nice thin kerf blade that comes with it. (A Diablo general purpose blade). The size of sole has been well thought out, 1½” from the blade on one side and 3½” on the other. The cable seems to be very heavy duty - important for its powerful motor. A very nice touch is that the depth adjustment has present marks for various typical thickness cuts (such as 2x lumber etc.). No tools are needed to change the depth or angle. The supplied tool that is used for changing the blade has a place on the machine so one should always have it handy when needed. My first job required some plunge cuts and it handled them with ease. The saw does not stand up by itself (blade down), so I found I had to learn to lay it on its side. The saw is light to handle. I am used to the blade being on the right of the machine but I quickly got used to the blade being on the left, which works well for a right handed person. The left side blade does allow better visibility of the cut. There is no laser line which may have been nice but certainly not critical. Instead there is a white marker on the leading edge of the sole that shows where the cut will be. There is a nice big solid hook that folks out which allows the machine to be hung on a ladder rung or 2x lumber. This is the first saw that I own that takes oil. This is because it has a worm-drive. I do not expect that I will have to top that up too often. May 29, 2014
Rated 5.0 out of 5.0 by Can't go wrong Luckily I was able to test this saw out for three semesters. I had to buy the magnesium one. Can't go wrong it, comes with blade, 50 plus degrees for angles, wench to change blade (stashes under the motor above the table) and most important it has an inside carrot (where the you marked on wood) and outside carrot on table for cutting (where the blade actually cuts.) March 28, 2015
Rated 5.0 out of 5.0 by Skil worm drive saw Skilsaw worm drive saws are the Choice of professional carpenters. This is the only saw I have used for over 30 years for framing. You just can't beat it not even with a stack of plywood, it eats right through it at max depth with no bogging. Just make sure you lock your elbow first then pull that trigger. March 3, 2015
Rated 5.0 out of 5.0 by Residential Builder for over 23 years Only circular saw I'll ever own, I call it a right handed saw because I'm right handed and it feels perfect. Rip 2 x plus lumber all day long, drop off a roof, indestructible. Frame or trim just need correct blades. Keep maintenance up you'll never be disappointed. September 11, 2014
Rated 5.0 out of 5.0 by great saw I purchase this saw for a small job, Damm I was impressed with the power of the saw. this saw cuts 2X4 like butter grateful saw December 14, 2014
Rated 5.0 out of 5.0 by Wow I have never used a worm drive - out of the box I like the size this provides - it is narrower because you do not have the motor hanging off the side. I expect this will make certain cuts possible that I could not do before. More importantly - this tool has very nice torque. I used it to do a demo job on a ceramic tile floor with 1-1/4 cement backer. This was no problem - no stalling and went through it like butter. I would have expected some binding with my old saw - but it didn't happen with this saw. I think I have a new favorite tool! May 28, 2014
Rated 5.0 out of 5.0 by My first saw and I love it This is my first saw to own and I love it. I found it easy to use, not too heavy and cuts clean and true. My first project is making planting boxes for my garden and although far from finished, I am thrilled to have this saw to help me out. I was a little intimidating at first since I am a novice and it was louder than I had expected. But with some earplugs, which is a good idea for protecting your hearing and some practice cuts, I started to feel comfortable very quickly. June 25, 2014
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