Ridgid · Updated June 2026
Ridgid R86040B 18V X4 4-1/2 in. Cordless Angle Grinder (Tool Only): price & specs
Ridgid R86040B 18V X4 4-1/2 in. Cordless Angle Grinder (Tool Only). Every price and spec below is linked to its source and dated — no guesses.
Source: homedepot.com verified ✓ corroborated verify in ledger
The Ridgid R86040B 18V X4 4-1/2 in. Cordless Angle Grinder (Tool Only) is listed at $99 on homedepot.com as of 2026-06-27, #7 cheapest of 18 angle grinders (median $144); other retailers may be lower. It earns a Silver Deskmark — 56/100 pay-blind standing, #8 of 17 in class.
Verified Jun 27, 2026 · figures linked to their source in the table below
Cheapest angle grinders: Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only) — $49.97
- Best for Cordless mobility and freedom from tangled cords; Strong torque that pushed through steel without backing down.
- Skip if Fast battery drain; two or three batteries effectively mandatory (6-7 cuts per charge) is a dealbreaker.
Is the Ridgid R86040B 18V X4 4-1/2 in. Cordless Angle Grinder (Tool Only) a good buy?
At $99, the Ridgid R86040B 18V X4 4-1/2 in. Cordless Angle Grinder (Tool Only) is #6 cheapest of the 18 angle grinders we track, where the median is $149. On the spec sheet, its disc size of 4.5 in is the lowest of the 18, its max of 9000 rpm is below the median of the 18, and its weight of 4.5 lb is at the median of the 17.
Evidence of Record
Our data- Independent labsmeasured it
- 1
- Physical metricsrecorded
- 2
- Outlets on recordall tested
- 1
One independent lab measured this product across 2 physical metrics — battery and time to prep. These numbers rest on a single hands-on source so far.
Review consensus · sourced & dated
What reviewers say about the Ridgid R86040B 18V X4 4-1/2 in. Cordless Angle Grinder (Tool Only)
Only one whitelisted tester, Pro Tool Reviews, hands-on tested this exact R86040B. PTR scored it 8.2/10, praising cordless mobility and strong cutting torque, but flagged fast battery drain (6-7 cuts per charge) and a single fixed speed with no variable control.
Based on 1 review · 1 lab-tested · 2013-12-03
Tested by Pro Tool Reviews
Consistently praised
- Cordless mobility and freedom from tangled cords
- Strong torque that pushed through steel without backing down
- Handy overload-indicator LED and easy tool-less guard adjustment
Commonly flagged
- Fast battery drain; two or three batteries effectively mandatory (6-7 cuts per charge)
- Single fixed speed with no variable-speed control for precise work
- On/off switch tricky with thick welding gloves; spanner wrench not stored on the tool
Where reviewers disagree Single-source (Pro Tool Reviews) field test on a real furniture-building project, so there is no cross-tester corroboration; the runtime figures are counted cuts from one user's real-world use rather than a standardized lab benchmark.
The sources (1)
Cuts per charge, 1-1/4 in. 14-gauge steel square tubing (field test): 6 cuts on first charge, 7 cuts on next charge · Time to prep all frame pieces for welding: ~40 min
Ridgid really got it right for a solid performing, all-around grinder experience that leaves the cord behind.
The Ridgid R86040B cordless grinder earns big points here for mobility.
I was a bit disappointed in how quickly I went from three bars of battery life to zero.
Specifications
| Price (US) | $99 Historical MSRP at Home Depot (tool only); discontinued/superseded |
|---|---|
| Brand | Ridgid |
| Released | — |
| Disc size (in) | 4.5 in |
| Power source | cordless |
| Amps or voltage | 18 V |
| Max (rpm) | 9000 |
| Brushless | No |
| Switch type | slide |
| No volt release | — |
| Weight (lb) | 4.5 |
Source: homedepot.com (verified 2026-06-20) · corroborated by manualslib.com. CORRECTED: this is the older X4 series, which is a BRUSHED motor, not brushless. The draft's 'brushless: true' and the 'Brushless' in the name were a fabrication propagated from an incorrectly titled iFixit device page ('Ridgid Brushless R86040'); Home Depot's official R86040B listing and retailer specs confirm the X4 grinder is brushed. brushless set false, name/source corrected. 9,000 RPM and 18V confirmed in the official Ridgid R86040 operator's manual. Slide switch and 4.5 lb weight per retailer specs. No-volt release not documented.
Is the Ridgid R86040B 18V X4 4-1/2 in. Cordless Angle Grinder (Tool Only) worth it vs cheaper angle grinders?
Ridgid R86040B 18V X4 4-1/2 in. Cordless Angle Grinder (Tool Only) against its closest cheaper and pricier angle grinders on the specs that matter — every value sourced. See all 18 ranked
| Product | Price | Disc size (in) | Power source | Amps or voltage | Max (rpm) | Brushless |
|---|---|---|---|---|---|---|
| Ridgid R86040B 18V X4 4-1/2 in. Cordless Angle Grinder (Tool Only) this | $99 | 4.5 in | cordless | 18 V | 9000 | No |
| Bosch 1375A 4-1/2 in. 6 A Corded Angle Grinder | $98 | 4.5 in | corded | 6 A | 11000 | No |
| DeWalt DWE402 4-1/2 in. Small Angle Grinder | $117 | 4.5 in | corded | 11 A | 11000 | No |
Frequently asked questions
What do reviewers say about the Ridgid R86040B 18V X4 4-1/2 in. Cordless Angle Grinder (Tool Only)?
Only one whitelisted tester, Pro Tool Reviews, hands-on tested this exact R86040B. PTR scored it 8.2/10, praising cordless mobility and strong cutting torque, but flagged fast battery drain (6-7 cuts per charge) and a single fixed speed with no variable control. Praised: Cordless mobility and freedom from tangled cords; Strong torque that pushed through steel without backing down; Handy overload-indicator LED and easy tool-less guard adjustment. Flagged: Fast battery drain; two or three batteries effectively mandatory (6-7 cuts per charge); Single fixed speed with no variable-speed control for precise work; On/off switch tricky with thick welding gloves; spanner wrench not stored on the tool. (From 1 tester review, 1 lab-tested.)
How much does the Ridgid R86040B 18V X4 4-1/2 in. Cordless Angle Grinder (Tool Only) cost?
The Ridgid R86040B 18V X4 4-1/2 in. Cordless Angle Grinder (Tool Only) has a US price of $99 (Historical MSRP at Home Depot (tool only); discontinued/superseded), as of 2026-06-20.
How does the Ridgid R86040B 18V X4 4-1/2 in. Cordless Angle Grinder (Tool Only) compare on price?
At $99, the Ridgid R86040B 18V X4 4-1/2 in. Cordless Angle Grinder (Tool Only) is #6 cheapest of the 18 angle grinders we track, where the median is $149.
What are the Ridgid R86040B 18V X4 4-1/2 in. Cordless Angle Grinder (Tool Only)'s key specs?
Ridgid R86040B 18V X4 4-1/2 in. Cordless Angle Grinder (Tool Only) (Ridgid): disc size in 4.5 in, power source cordless, amps or voltage 18 V, max rpm 9000, brushless No. Full sourced spec sheet verified 2026-06-20.
Price of record: $99 at homedepot.com, 2026-06-27. Other retailers may be lower — check the current price:
See Ridgid R86040B 18V X4 4-1/2 in. Cordless Angle Grinder (Tool Only) on Amazon As an Amazon Associate we earn from qualifying purchases.Similar angle grinders
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Compare with
Head-to-head
- Ridgid R86040B 18V X4 4-1/2 in. Cordless Angle Grinder (Tool Only) vs DeWalt DWE402 4-1/2 in. Small Angle Grinder
- Ridgid R86040B 18V X4 4-1/2 in. Cordless Angle Grinder (Tool Only) vs Milwaukee M18 FUEL 2880-20 4-1/2 in./5 in. Grinder Paddle Switch No-Lock (Tool Only)
- Ridgid R86040B 18V X4 4-1/2 in. Cordless Angle Grinder (Tool Only) vs Makita GA4530 4-1/2 in. Corded Angle Grinder
- Ridgid R86040B 18V X4 4-1/2 in. Cordless Angle Grinder (Tool Only) vs Bosch GWS13-50 5 in. Corded Angle Grinder
- Ridgid R86040B 18V X4 4-1/2 in. Cordless Angle Grinder (Tool Only) vs Metabo HPT G12SR4 4-1/2 in. 6.2 A Slide Switch Corded Angle Grinder
- Ridgid R86040B 18V X4 4-1/2 in. Cordless Angle Grinder (Tool Only) vs Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only)
- Ridgid R86040B 18V X4 4-1/2 in. Cordless Angle Grinder (Tool Only) vs Metabo WEV15-125 Quick 4-1/2 in./5 in. 13.5 A Variable Speed Corded Angle Grinder
Cheaper angle grinders
- Bosch 1375A 4-1/2 in. 6 A Corded Angle Grinder $98
- Bosch GWS18V-45 18V 4-1/2 in. Cordless Angle Grinder (Bare Tool) $95.06
- Milwaukee 6130-33 7.0 A 4-1/2 in. Small Angle Grinder $89.99
- Makita GA4530 4-1/2 in. Corded Angle Grinder $89
- Metabo HPT G12SR4 4-1/2 in. 6.2 A Slide Switch Corded Angle Grinder $74
- Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only) $49.97
Step up
- DeWalt DWE402 4-1/2 in. Small Angle Grinder $117
- Makita GA5052 4-1/2 in./5 in. Paddle Switch Corded Angle Grinder (AC/DC) $129
- Bosch GWS13-50 5 in. Corded Angle Grinder $159
- Makita XAG04Z 18V LXT Brushless 4-1/2 in./5 in. Cut-Off/Angle Grinder (Tool Only) $179
- DeWalt DWE43144N 6 in. 13 A E-Clutch Paddle Switch Corded Angle Grinder (No Lock-On) $188
- DeWalt DCG413B 20V MAX XR Brushless 4-1/2 in. Paddle Switch Angle Grinder (Tool Only) $199