Home Depot has
RIDGID 18V SubCompact Brushless Cordless 3/8" Impact Wrench (Tool Only) with Belt Clip (R87207B) on sale for
$79.
Shipping is free.
Thanks to Community Member
TheRazor570 for finding this deal.
Key Features:- Brushless Motor Technology delivers more runtime, power, and longer motor life
- 3-Speed plus auto-tightening mode provides adjustable speed and power
- Up to 2,800 RPM and up to 225 ft./lbs. of breakaway torque
- Best access in tight spaces at 4.31 in. in length
- SubCompact model: ideal for tight spaces, 20% less weight and 25% more compact in comparison to RIDGID OCTANE 3/8 in. Impact Wrench R86239BN
- 3/8 in. Friction ring for quick and easy socket changes
- All metal gears for extended durability
- LED Light for improved visibility in confined spaces and low light situations
- 100% Compatible: Works with all RIDGID 18V Batteries, Tools, and Chargers
- Lifetime Service Agreement with registration within 90 days of purchase
- Includes:
- 1x 18V SubCompact Brushless 3/8 in. Impact Wrench (R87207)
- 1x Belt hook with screw
- Operator's manual
- Battery and charger sold separately
Top Comments
actually improve performance of these tools.
Speaking as someone with in depth experience with batteries, you are absolutely correct that a given Ah rating number itself doesn't really imply anything
other than charge (Coulombs) or energy capacity in a battery and even the meaning of capacity and energy involved is unclear since although these are
marketed as '18V' batteries the actual voltage fully charged and at 'empty' and in between will vary somewhat according to the particular battery design and
its age etc.
If one is designing a battery pack with a fixed nominal (e.g. mid point between empty and full voltages) output of 3.7V to get 18V you''d need 5*3.7V cells
in series connection to make the pack voltage around 18V. If you used 2Ah capacity single cells for the five in the pack then that'd be a 5-series cells * 1-paralleled cell string or "5S1P" 2Ah 18V nominal pack.
But if you wanted to make a 4Ah 18V pack then since you want to keep the voltage the same, the easiest thing is to effectively put two 2Ah 18V batteries "in parallel" so they work side by side spreading the current load evenly so that'd be the same as making a 5S2P pack since now you have a two-cell-string parallel connection and twice the total number of cells as the 2Ah pack.
Similarly a 6Ah pack could be made as a 5S3P design with three parallel strings of 5-series connected cells.
However each cell and equivalently each series string of cells has a maximum current it can put out maybe 3A give or take for example.
But when you double or triple the number of parallel connected cells the current divides evenly 2-ways or 3-ways respectively so instead of getting a
maximum of 3A for 1P, you get maximum 6A for 2P or 9A for a 3P pack cell arrangement.
Low voltage motors need more power at heavy loads and since the battery pack voltage won't increase -- if anything it droops at high loads, what is
needed is more current, but there's a maximum of say 3A per series connected cell string there. But the 4Ah pack having 2P might have a
peak current of 2*3A and the 6Ah pack might have a peak current of 3*3A because of the paralleled cell count so actually the 4Ah or 6Ah etc. packs
can put out double or triple the current & power as the 2Ah pack can under the heaviest loads because of the parallel cells.
That, I believe, is why when tests like 'torque channel' or others on youtube review impact wrenches they sometimes show the capability with different
battery capacities because it does, in fact, substantially increase the maximum load endurance / power of the unit to use a higher capacity pack since
the pack is ALSO higher current capability.
68 Comments
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Specs are on HD in the link posted. It is a subcompact and shorter. I intentionally bought an impact wrench to use as a driver. Rather than an impact driver to use as an impact wrench. Also, I did a hack last year to get this $81. $80 with no hack is good.
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Yeah, Ive seen that test also. It is designed to have only so much fastening tq. High and mid fastening tq does not make much sense for a sub compact 3/8" drive.
https://youtu.be/-zoNy5s_lhs?t=66
Given its physical size, its not the tool for mid and high tq applications. I can feel a bit more power using a 4ah instead of a 2ah. Typical of brushless tools. Larger battery, more power. Also, the same guy tests it with a 2ah @ 250 lbs.
Our community has rated this post as helpful. If you agree, why not thank QuixoticOne
actually improve performance of these tools.
Speaking as someone with in depth experience with batteries, you are absolutely correct that a given Ah rating number itself doesn't really imply anything
other than charge (Coulombs) or energy capacity in a battery and even the meaning of capacity and energy involved is unclear since although these are
marketed as '18V' batteries the actual voltage fully charged and at 'empty' and in between will vary somewhat according to the particular battery design and
its age etc.
If one is designing a battery pack with a fixed nominal (e.g. mid point between empty and full voltages) output of 3.7V to get 18V you''d need 5*3.7V cells
in series connection to make the pack voltage around 18V. If you used 2Ah capacity single cells for the five in the pack then that'd be a 5-series cells * 1-paralleled cell string or "5S1P" 2Ah 18V nominal pack.
But if you wanted to make a 4Ah 18V pack then since you want to keep the voltage the same, the easiest thing is to effectively put two 2Ah 18V batteries "in parallel" so they work side by side spreading the current load evenly so that'd be the same as making a 5S2P pack since now you have a two-cell-string parallel connection and twice the total number of cells as the 2Ah pack.
Similarly a 6Ah pack could be made as a 5S3P design with three parallel strings of 5-series connected cells.
However each cell and equivalently each series string of cells has a maximum current it can put out maybe 3A give or take for example.
But when you double or triple the number of parallel connected cells the current divides evenly 2-ways or 3-ways respectively so instead of getting a
maximum of 3A for 1P, you get maximum 6A for 2P or 9A for a 3P pack cell arrangement.
Low voltage motors need more power at heavy loads and since the battery pack voltage won't increase -- if anything it droops at high loads, what is
needed is more current, but there's a maximum of say 3A per series connected cell string there. But the 4Ah pack having 2P might have a
peak current of 2*3A and the 6Ah pack might have a peak current of 3*3A because of the paralleled cell count so actually the 4Ah or 6Ah etc. packs
can put out double or triple the current & power as the 2Ah pack can under the heaviest loads because of the parallel cells.
That, I believe, is why when tests like 'torque channel' or others on youtube review impact wrenches they sometimes show the capability with different
battery capacities because it does, in fact, substantially increase the maximum load endurance / power of the unit to use a higher capacity pack since
the pack is ALSO higher current capability.
actually improve performance of these tools.
Speaking as someone with in depth experience with batteries, you are absolutely correct that a given Ah rating number itself doesn't really imply anything
other than charge (Coulombs) or energy capacity in a battery and even the meaning of capacity and energy involved is unclear since although these are
marketed as '18V' batteries the actual voltage fully charged and at 'empty' and in between will vary somewhat according to the particular battery design and
its age etc.
If one is designing a battery pack with a fixed nominal (e.g. mid point between empty and full voltages) output of 3.7V to get 18V you''d need 5*3.7V cells
in series connection to make the pack voltage around 18V. If you used 2Ah capacity single cells for the five in the pack then that'd be a 5-series cells * 1-paralleled cell string or "5S1P" 2Ah 18V nominal pack.
But if you wanted to make a 4Ah 18V pack then since you want to keep the voltage the same, the easiest thing is to effectively put two 2Ah 18V batteries "in parallel" so they work side by side spreading the current load evenly so that'd be the same as making a 5S2P pack since now you have a two-cell-string parallel connection and twice the total number of cells as the 2Ah pack.
Similarly a 6Ah pack could be made as a 5S3P design with three parallel strings of 5-series connected cells.
However each cell and equivalently each series string of cells has a maximum current it can put out maybe 3A give or take for example.
But when you double or triple the number of parallel connected cells the current divides evenly 2-ways or 3-ways respectively so instead of getting a
maximum of 3A for 1P, you get maximum 6A for 2P or 9A for a 3P pack cell arrangement.
Low voltage motors need more power at heavy loads and since the battery pack voltage won't increase -- if anything it droops at high loads, what is
needed is more current, but there's a maximum of say 3A per series connected cell string there. But the 4Ah pack having 2P might have a
peak current of 2*3A and the 6Ah pack might have a peak current of 3*3A because of the paralleled cell count so actually the 4Ah or 6Ah etc. packs
can put out double or triple the current & power as the 2Ah pack can under the heaviest loads because of the parallel cells.
That, I believe, is why when tests like 'torque channel' or others on youtube review impact wrenches they sometimes show the capability with different
battery capacities because it does, in fact, substantially increase the maximum load endurance / power of the unit to use a higher capacity pack since
the pack is ALSO higher current capability.
Plenty of youtube tests prove a larger battery with "brushless" tools does increase power and run time. The vid tool tester I posted originally tested the 3/8 subcompact in another vid @250lbs with a 2ah bat.. With the 6ah bat in the vid I posted it tested @ 450 lbs.
I can feel the increased power using a 1.5ah or a 2ah compared to a 4ah in brushless drill, impact wrench, recip saw...
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