Ryobi ONE+ 18V 5 in. Random Orbit Sander (PCL406B): problems, parts and running costs

Checked: 2026-10-08

Summary

The PCL406B is a bare-tool 18V ONE+ random-orbit sander at $59.97 tool-only, or $124.00 as the PCL406K1 kit with a 4Ah battery and charger, running a fixed 10,000 orbits per minute. The recurring owner complaints are the friction-fit dust bag flying off, torque drop under load, short battery life on 2Ah packs and the lack of variable speed. Running cost is basically sandpaper — a 7-piece assortment costs $5.47-6.47 at Ryobi — plus a battery and charger if you are new to ONE+; it is a strong buy at $60 or less for existing ONE+ owners.

Common problems and fixes

Torque drop under load — once force is applied there is not enough torque to keep spinning and the sanding grinds to a halt; no fix reported. [6]
Short battery life on 2Ah packs — one editor got about 15 minutes of use from a 2Ah battery, though another owner finished a full sanding prep on a single 2.0Ah pack; tasks and pressure vary. [6][5]
Excessive vibration — one editor found vibration “pretty aggressive” in prolonged use, and a 6Ah battery made the tool heavy, unbalanced and worse; stick to a 2Ah pack for weight distribution. [6]
No variable-speed control — 10,000 OPM is the only speed, which limits jobs that want a slower pass; both Popular Woodworking and How-To Geek flag it. [4][6]
Switch failure after about a year — one Reddit user’s switch died after a year or so; he replaced it himself by watching videos and found the job easy. [7]

Parts and consumables

7-piece sandpaper assortment (A21701) — $5.47-6.47 at Ryobi (2026); the wear item of the tool; owners do not report a replacement interval. [1]
5 in. backer pad (A21BP01) — $16.97 at Ryobi (2026); replacement interval not reported. [1]

Yearly running cost

Sandpaper is the only scheduled consumable: a 7-piece 5 in. assortment (A21701) costs $5.47-6.47 at Ryobi (2026), and owners do not report replacement intervals, so a yearly figure depends on use — a few assortments a year for occasional DIY work. New buyers also need a ONE+ battery and charger: the PCL406K1 kit with a 4Ah battery and charger is $124.00 at Ryobi (2026), and Home Depot lists kit configurations from $99 to $179 (2026). [1][2][8]

When it is a good buy

$59.97 tool-only (Ryobi, 2026) — strong value for existing ONE+ owners doing occasional light-to-medium sanding; the 3-year warranty is longer than many competitors. [1]
$61-80 — still reasonable if cordless convenience matters more than raw power. [1]
$81-100 — fair; compare cordless sanders with variable speed and brushless motors. [1]
$101-130 — weak-to-fair for the bare tool; the $124.00 kit with a 4Ah battery is easier to defend than the bare tool at that money. [2]
Over $130 — weak value; a corded sander (Bosch 2.5A, DeWALT DWE6423) or the Ryobi brushless PBLSD01B offers more power, better dust collection and variable speed. [6]
Home Depot US lists the tool at $59.97 with kits from $99 to $179 (2026); Home Depot Canada lists it at CAD 89.98 (2026). One editor bought it on sale for around $39 in a prior year. [8][9][6]