# Ridgid R86040B 18V X4 4-1/2 in. Cordless Angle Grinder (Tool Only): specs and price

**Price (US):** $99 at homedepot.com (Historical MSRP at Home Depot (tool only); discontinued/superseded), as of 2026-06-27. A sourced, dated price of record — other retailers (incl. Amazon) may be lower. Among the 18 angle grinders we track it is #7 cheapest of 18; category median $144.
**Brand:** Ridgid
**Deskmark:** Silver Deskmark — pay-blind category standing 56/100, #8 of 17 in class (independent, computed from sourced data, never for sale).
**Price tracked since:** June 2026

## Specifications

| Spec | Value |
| --- | --- |
| Price (US) | $99 |
| Brand | Ridgid |
| 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 |

## Where it stands

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.

## What reviewers say

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.)

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.
Disagreement: 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.
Sources: Pro Tool Reviews (2013-12-03, protoolreviews.com)

## 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.

Source: https://www.homedepot.com/p/RIDGID-X4-18-Volt-Lithium-Ion-Cordless-4-1-2-in-Angle-Grinder-R86040B/203930490 (homedepot.com, accessed 2026-06-20)
Corroboration: https://www.manualslib.com/manual/796307/Ridgid-R86040.html (accessed 2026-06-20)
Canonical: https://frontdeskreview.com/product/angle-grinders/ridgid-r86040b/
Cite: Per The Front Desk Review, the Ridgid R86040B 18V X4 4-1/2 in. Cordless Angle Grinder (Tool Only) price of record was $99 as of 2026-06-20 — https://frontdeskreview.com/product/angle-grinders/ridgid-r86040b/
License: CC BY 4.0. Price history: https://frontdeskreview.com/data/price-history.jsonl