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Johnson Level & Tool 1904-0450 Johnny Square Professional Easy-Read Finish Square, 4.5", Black, 1 Square*

  • Based on 3,069 reviews
Condition: New
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Availability: In Stock.
Fulfilled by Amazon

Arrives Sep 28 – Sep 29
Order within 23 hours and 29 minutes
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Size: 4.5-inch


Style: Standard


Features

  • SQUARE LAYOUT TOOL: Made of extruded aluminum; this triangle carpenter square is CNC machined for durability. This laser-etched square comes with Johnson's best-in-class limited lifetime warranty as it can resist any worksite damage.
  • EZ-READ FINISH: The glare-resistant EZ-Read anodizing method used for finishing this 4 1/2" finish square allows the EZ Read laser etched graduations and numbers to stand out and makes them highly visible.
  • APPLICATION RANGE: The builders and contractor appreciate the versatility of this measuring tool. This square is great for finishing construction; establishing saw blade angles; and more in small spaces.
  • CONTINUOUS SCRIBING NOTCHES: The rafter square has continuous scribing notches for ripping lumber from 1-1/2" to 3-1/2"; as well as convenient markings that measure 24 board dimensions of 1-1/2" and 3-1/2".
  • PRODUCT DESCRIPTION: This black Johnny Square measures 0.75 6.25 3.25 inches and has an erasable space on the back to write finish notes. The square has a protective anodized coating that is low-glare.

Description

This compact 4 1/2" finish square is ideal for access in tight quarters for finish carpentry, setting saw blades and more. CNC machined from extruded aluminum and finished with the same glare-resistant EZ-Read™ anodizing process that made our Johnny Square® famous, this laser-etched square is durable enough to withstand any jobsite abuse, and is backed by Johnson's best-in- class limited lifetime warranty. This rafter square also features continuous scribing notches that are ideal for ripping lumber from 1-1/2" to 3-1/2" as well as handy markers that measure 2x4 board dimensions of 1-1/2" and 3-1/2".

Material: Aluminum


Brand: Johnson


Color: black


Style: Standard


Graduation Range: 1/8 inches


Brand Name: Johnson


UPC: 049448904044


Unit Count: 1 Count


Item Thickness: 0.75 inches


Number of Items: 1


Included Components: Square


Item Weight: 1.6 ounces


Item Type Name: Square


Manufacturer: Johnson Level & Tool


Model: 1904-0450


Part Number: 19040450


Warranty Description: Limited Lifetime Warranty, Limited Lifetime Warranty Johnson level warrants this product against defects in material and workmanship of mechanical parts for life and electronics for one year. The company will replace or repair the product if it fails under normal use. This warranty is limited to the repair or replacement of the product only.


Material Type: Aluminum


Graduation Range: 1/8 inches


Item Dimensions L x W: 6.25"L x 0.75"W


Color: black


Style Name: Standard


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sep 28 – Sep 29

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Leasing options through Acima may also be available during checkout.

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Top Amazon Reviews


  • Good balance between quality and price
Size: 7-inch Style: Standard
This is a solid square and most importantly, it’s actually square — which is really the entire job. The materials and finish both feel good, and it’s noticeably nicer than the ultra-cheap options without getting into premium professional pricing. I’m not in construction and don’t use every feature these framing squares offer, but for casual woodworking, layout work, and setting up cuts it’s been great. One thing I’ve learned is that starting a project even slightly out of square just compounds problems later and leads to frustration very quickly, so this is not a tool I’d recommend completely cheaping out on. At the same time, I also don’t think most hobbyists necessarily need the most expensive professional-grade square on the market either. This feels like a really good middle ground between affordability and quality. Overall, if you’re a DIYer or casual woodworker looking for a dependable framing square without overspending, this is a good choice. ... show more
Reviewed in the United States on May 18, 2026 by Nathan V

  • Recommended
Size: 4.5-inch Style: Standard
This thing is awesome. Big help for small jobs.
Reviewed in the United States on August 4, 2026 by Scott

  • Highly precise
Size: 4.5-inch Style: Standard
Excellent tool
Reviewed in the United States on August 8, 2026 by Tim

  • Nice product, grippy texture that doesn't scratch painted metals
Size: 4.5-inch Style: Standard
I like these small squares, I moved over to this square from the Milwaukee version and so far I like it. This square has a grippy coating that doesn't scratch up downspouts I mainly use it for marking cuts while building 2x3 steel downspouts. It's very comfortable over using the regular speed square. ... show more
Reviewed in the United States on April 23, 2026 by Sergey Yushkov

  • NOT THE AVERAGE SIZE
Size: 4.5-inch Style: Standard
I bought this speed square off of amazon. After shipping cost me roughly 20 bucks. Kinda nice for what it is, has a little notepad on the back that's cool. However it is not the average size speed square. I bought this without paying attention and ended up with this 4.5" lesson learned Pay Attention! ... show more
Reviewed in the United States on March 22, 2024 by James Malone

  • Works great for what we needed it for.
Size: 4.5-inch Style: Standard
I bought this for my boyfriend. This would make the perfect gift for a handy man. Great price. This is so easy to use and take with you on the go. It is lightweight but made with sturdy material.
Reviewed in the United States on August 30, 2026 by Kelsey

  • Item is as described
Size: 4.5-inch Style: Standard
Item described and looks as mentioned.
Reviewed in the United States on January 23, 2026 by Pen Name

  • Clearly one of the best small squares out there
Size: 4.5-inch Style: Standard
Super handy size of this square makes it a must have around the wood shop. Love the white on black easy-read markings. The price is right and it seems to be a quality tool. Was going to pay the price for one of those fancy smaller squares, but glad I didn't. For what I would have paid, I could have three of these. Will definitely get another one to have as a spare. ... show more
Reviewed in the United States on December 2, 2024 by Hank W

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