Why Read This Article?
Finish Nailer Repair - Replacing the Driver Guide (Ridgid Part # 79004001022)
Finish Nailer Repair - Replacing the Driver Guide (Ridgid Part # 79004001022)
1. The overall measurements of the blade.
2. The shape, number, situation, and measurements of the blades holes. Every lawn mower blade has at least one hole in it for where it attaches to the machine.
"Overall measurements" include the blade's length, width, and thickness. Regarding the blade's holes, the number of holes, the shape of the holes, the size of each hole, and the distance between the outer holes must be known. After-market mower blades are listed by these measurements. So, even though a given mower model will correspond to only one specific blade design (its measurements and holes), information about the holes and other measurements must be used to find the right blades. Below we describe each of these measurements in detail and explain how to take them. Blade Length Mower blade length gets measures like television screens are measured: corner to corner.
This is an easy measurement to take, and will most likely be one of the first that users see in a replacement blade's description. Mower blades come in a span of lengths from as small as almost 6" to over 32".
[Back to top] Blade Width and Thickness These measurements are as straight forward as they sound, and are also used to identify compatible replacement mower blades.
Mower blades can be 1 1/2" to 4 1/4" in width, and are available in thicknesses ranging from about 1/10" to almost 1/3". [Back to top] Number of Holes Lawn mower blades will have either one or three holes in them for where they attach to the machine.
Obviously, this information is also important for matching mower blades. [Back to top] Hole Shapes In addition to other blade differences, manufacturers cut the holes in mower blades to several different shapes. The most common shapes for mower blade holes are circular, rectangular, star, and 7-star. Holes that go simply as "star" shaped are stars with five points and are also called "5/8 star." "7-star" holes have seven points on them and also go by "7/8 star." [Back to top] Hole Measurements Measurements for square holes and round holes are also needed. These measurements are taken in inches, and measure the diameter of the holes. A separate measurement is taken for both the center hole and the outer holes. These numbers will be listed separately in a blade's description as the "center hole size" and the "outer hole size."
[Back to top] The Center-to-Center Measurement The last measurement needed to match compatible blades to mowers is the "center to center" measurement. This measurement is the distance between the centers of the mower blade's outer holes (if it has outer holes).
Obviously, one hole mower blades won't have this measurement. All of these blade measurements work together to provide a very detailed description of the mower blade, and ensure that the right configuration of holes, hole sizes, and hole distance is found to match a mower's design. [Back to top] Matching Mower Blade Search Steps The following are steps that should be taken before beginning a search for a matching mower blade.
1. Take the overall measurements of the blade: length, width, and thickness.
2. Get all of the hole information and measurements: number of holes, size of the holes (center and outer), and the center-to-center measurement.
Now for the good news: the rest is easy. If you have those three numbers, matching the right replacement mower blade only takes a moment.
Below are steps for using these measurements with eReplacementParts.com's easy search filter features on our "Lawn Mower Blades" page. All you have to do is click the correct measurements on the page, and it will automatically filter the search results to only display blades that match those measurements.
1. Navigate to the Lawn Mower Blades page on eReplacementParts.com.
This page will display all of the hundreds of mower blades that we currently carry, before the search results are narrowed that is.
2. Narrow Search Results by the Blade's Overall Measurements.
There is a box titled "Narrow Listings By:" at the top of the "Lawn Mower Blades" page. Below the title of the box are click-able buttons in brackets for narrowing the displayed search results. Here's what it looks like:
To narrow the search results to list only blades whose measurements match the blade you're looking for, simply click the correct measurement in the "Narrow Listings By:" box. When you do, the page will automatically refresh and display only the blades that match the selected measurement
So, for example, if I were to click the "[20"]" button next to where it says "Length:", the page will only display blades with a 20" length when the page automatically refreshes.
Also, after narrowing down the results by clicking a measurement, the click-able buttons for that measurement category will disappear when the page refreshes, since that blade quality has already been determined. So, after clicking the "[20"]" length measurement button, all of the "Length:" measurement buttons will disappear when the page refreshes.
3. Continue to Narrow Search Results with Other Measurements
In the "Narrow Listings By:" box, continue to match measurements and hole information about the desired mower blade by clicking the correct buttons for those measurement categories, as described in Step 2.
This will further narrow the search results to only blades that match all of the selected measurements and hole shapes.
Just as described above, the page will automatically refresh after making each new selection, displaying narrower search results and removing the already-determined measurement buttons.
The search can also be narrowed further by manufacturer and availability if desired.
Once overall measurements, hole measurements, and hole shapes are selected, the search results still might display many different matching blades. This is because there are still a number of blade type and feature variations, even withing blades of the same measurements and hole orientation.
And that's it for selecting a compatible lawn mower blade! [Back to top] Major Lawn Mower Blade Types Although a mower is restricted to using blades that correspond to a matching configuration of holes and measurements, most mowers will still have several blade type options available that are compatible. Lawn mower blade types employ different designs that offer a variety of "lift" and mulching options. The major types of lawn mower blades are described below:
Low Lift Blades-
Low lift blades are primarily for side discharge mowing. Their design includes a less-drastic swoop than high lift blades, encouraging the cut grass to stay low where it is more available to be ejected out the side of the mower.
High Lift Blades-
With a more vertical swoop shape, high lift air underneath the mower better than low lift blades. This fan-like suction makes high lift blades ideal for bagging purposes, making bagging more efficient, and reducing the chance for the cut grass to get clogged up in the mower's cutting area.
The best blades for mulching are low lift blades that include an additional feature, a short dip in the blade's profile. Together, the low lift and the extra dip helps toss the grass around under the mower so that it can be mulched a bit before ejection. Accordingly, these are called mulching blades.
For users that want an all around solution, these blades cover all the bases. Commonly referred to as "gator" blades, these combine a medium lift (low and high) with a mulching feature to combine the three grass cutting approaches into one, also giving them the occasional name of "3-in-1" blades.
Gator blades are easy to spot because of their serrated segments at either end of the blade. Although they make higher lift mulching possible by using more than one design focus, 3-in-1 blades fall a little short in each area, high lift, low lift, and mulching, in order to reach that compromise. They remain very popular and are great for all around grass cutting use. [Back to top] Conclusion Like Hammer Drill Bits, Chainsaw Chains, and other tool accessories, some measurements and other information are needed when ordering replacement lawn mower blades. Because every mower will go through at least more than one blade in its lifetime, we've made finding exactly the right blade on our website easy. Visit our lawn mower parts page to find the mower blade you're looking for with just a few clicks. [Back to top] What we're about.