Why choose Grex 23 Gauge Headless Pins?

Not all 23 gauge pins are created equal. The quality of fasteners is dependent on three key attributes: (1) accurate dimensional specifications, (2) optimal material composition, and (3) dependable collation.

Because 23 gauge pins are extremely fine, setting high standards for each of these attributes is much more critical than traditional finish nails such as 18 or 16 gauge brads. You can be assured that all Grex 23 Gauge Pins are manufactured and tested for the tightest tolerances for each of these attributes.

These qualities will minimize the potential for nail jams and prevent damage to your tool. They also make it possible for your tool to drive these pins into the wood of your choice. Grex pins can easily penetrate through red oak - that's any pin length ranging from 3/8" upto 2". We have proven results for these pins with your Grex Pinner, but they will surely make any 23 gauge pin nailer work better.

Headless vs. Slight Headed Pins

Your Grex pinners are designed to only drive headless pins. When we developed our first pinner over 10 years ago, our testing showed that a tool that drives both headless and slight headed pins had a significantly higher risk of jamming which eventually resulted in tool damage. The reason is the looser tolerances required to accomodate both types of fasteners. So we decided to use purely headless pins. Holding power of a fastener comes from friction along the fastener shank and a combination of toeing and/or angling shots; not the head. And if you want to use a 23 gauge fastener because of the small hole it leaves, then why put a head on it to make it bigger?

See the chart below for the pin lengths, material and package quantities available as well as tool compatibility.

Fastener Lengths Galvanized

and Coated



and Coated





P630 P635 P645 P645L P650 P650L
3/8"10mm P6/10L P6/10-2.5 P6/10-ST A* A*
1/2"12mm P6/12L P6/12-2.5 P6/12-ST
5/8"15mm P6/15L P6/15-2.5 P6/15-ST
3/4"20mm P6/20L P6/20-2.5 P6/20-ST
7/8"22mm P6/22L P6/22-2.5
1"25mm P6/25L P6/25-2.5 P6/25-ST
1-1/8"28mm P6/28L P6/28-2.5
1-3/16"30mm P6/30L P6/30-2.5 P6/30-ST
1-1/4"32mm Do not use 1-1/4" (32mm) pins.
1-3/8"35mm P6/35L P6/35-2.5 P6/35-ST
1-1/2"38mm P6/38L P6/38-2.5 P6/38-ST
1-9/16"40mm P6/40L P6/40-2.5
1-3/4"45mm P6/45L P6/45-2.5 P6/45-ST
2"50mm P6/50L P6/50-2.5 P6/50-ST

Which pin lengths do I choose?

Grex Multi-Pack 23 Gauge Headless Pins are the perfect way to have an assortment of all the most popular pin lengths without having to purchase full packs or boxes of each length. It's ideal for hobbyists and is the perfect starter kit for first-time owners of Grex pinners who just don't quite know what pin lengths they need yet.

Note *The Auto-Lockout feature in the P645L and P650L models, will lock the trigger by default if 3/8" pins are used. The tools can drive 3/8" pins as long as the Lock-Out Override is depressed.

Multi-Pack Pins Galvanized

and Coated



3/8", 1/2", 5/8", 3/4", 1", 1-3/8"

500 pins per length

3,000 pins total

6 different lengths

1-3/16", 1-3/8", 1-1/2", 1-3/4", 2"

500 pins per length

2,500 pins total

5 different lengths