RYOBI

RYOBI P321K Nailer

Nailer
Battery
6.5 pounds
18 volts

4.3/ 5 on Amazon195Amazon ratings50+bought last month3.8ProductDome score

Medium confidenceLast refreshed Aug 4, 2026Amazon data + ProductDome analysis · methodology

Best forDiy trim or finish work where dragging a compressor and hose is inconvenient.

For DIY trim work, the P321K's cordless convenience often outweighs the extra driving force of a pneumatic nailer and hose.

As an Amazon Associate, ProductDome may earn a commission from qualifying purchases made through links on this page.

ProductDome scorecard

How it ranks among the 177 nailers we track

3.8/ 5ProductDome scoreMedium confidence

Owner satisfaction · 56% of scorecategory median 4.5★4.3

4.3★ across 195 Amazon ratings, Bayesian-smoothed toward the category average.

Evidence strength · 17% of scorecategory median 237 ratings2.9

195 Amazon ratings, weighted on a log scale so huge counts don't drown everything.

Buyer demand · 11% of score2.3

50+ bought on Amazon last month.

Data quality · 11% of score3.8

Brand identity, imagery, description and spec coverage.

The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 177 nailers we track - how the scorecard works · full nailers data report. Confidence: medium - useful but incomplete evidence.Last refreshed Aug 4, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.

Overview

Running on an 18 volt RYOBI battery instead of a compressor line, the P321K nailer weighs 6.5 pounds and fits RYOBI's cordless tool platform.

Because it draws power from a battery rather than an air hose, there is no compressor or hose to drag around a job site. The K in the model typically denotes a kit designation on RYOBI tools, though this listing does not spell out exactly what is included.

18 volt battery powered
6.5 pound weight
No compressor needed
RYOBI cordless platform

Who it's for

DIYers and trim carpenters who want cordless convenience without hauling a compressor and hose. Not for buyers who need pneumatic-level driving power for heavy framing fasteners.

Strengths and trade-offs

Drawn from this product's published specifications.

What stands out

Cordless, no compressor or hose
18 volt RYOBI battery platform
Light at 6.5 pounds

What to check first

Battery and charger inclusion not specified
Less driving power than pneumatic nailers

Performance notes

18 volt battery nailers generally trade some driving force for cordless freedom compared to pneumatic models. At 6.5 pounds the P321K is light enough for extended one-handed or overhead use without the fatigue a heavier tool would bring.

Specifications

Brand	RYOBI
Model	P321K
Power Source	Battery
Item Weight	6.5 pounds
Voltage	18 volts

How it compares

This product against the closest alternatives we track in nailers.

Product	Amazon rating	Ratings	ProductDome score
RYOBI P321K NailerThis product	4.3 / 5	195	3.8 / 5
DEWALT DWFP12231 NailerDeWalt	4.7 / 5	5,003	4.4 / 5
Metabo NT50AE2 NailerMetabo	4.6 / 5	3,587	4.4 / 5
BOSTITCH ‎BTFP12233 NailerBOSTITCH	4.8 / 5	2,616	4.4 / 5
Bielmeier BCSG-4 NailerBielmeier	4.3 / 5	3,991	4.3 / 5

Frequently asked

Questions about the RYOBI P321K

Common buyer questions answered straight from the product spec data - no fluff, no "it depends".

Does the RYOBI P321K need an air compressor?

No, it runs on an 18 volt battery rather than pneumatic pressure.

How much does the P321K weigh?

6.5 pounds.

What battery platform does it use?

RYOBI's 18 volt system.