Pool Cue Joint Pin Types Explained 2026: 5/16×14, 3/8×10, Radial, Uni-Loc and Why the Pin Decides Shaft Compatibility

Most players obsess over tip hardness, shaft taper, and butt weight. Almost nobody talks about the joint pin. That is a mistake, because the joint pin is the single spec that decides whether a shaft will physically thread onto a butt, how the cue feels at impact, and whether you can ever swap shafts between cues without a trip to a cuemaker. If you have ever bought a replacement shaft and discovered it would not screw in, the joint pin is why.

This guide breaks down the four pin types that matter in 2026: 5/16×14, 3/8×10, Radial, and Uni-Loc, plus the quick-release variants that have quietly become standard on several brand families. By the end you will know which pin is on your cue, which shafts are actually compatible, and what each pin choice does to the hit.

What the Joint Pin Actually Does

The joint pin is the threaded metal stud that connects the butt of your cue to the shaft. The pin sits in the butt, and the matching threaded insert sits in the shaft. When you screw the two halves together, the pin and the insert clamp the joint faces tight against each other.

That tightness is what determines how the cue transmits vibration on contact. A pin that engages over a long thread length with flat faces gives a stiffer, more responsive hit. A pin that uses a shorter thread or a piloted shoulder gives a softer, slightly cushioned hit. Neither is wrong. The right answer depends on your stroke, your shaft, and your personal preference for feedback.

5/16 x 14: The American Production Standard

5/16 x 14 means a 5/16 inch pin diameter with 14 threads per inch. It is the most common pin in American production cues and is the historical default on McDermott, Schon, and many older Joss and Meucci builds.

The hit is classic and balanced, with a slightly cushioned feel because the threads are relatively coarse and the joint faces are typically flat with a thin phenolic collar. If you grew up playing American production cues, a 5/16 x 14 joint is what most people mean when they say a cue feels normal.

Compatibility is broad but not universal. A 5/16 x 14 shaft will fit any cue with a 5/16 x 14 pin regardless of brand, which is why aftermarket shaft makers offer 5/16 x 14 as a default option.

3/8 x 10: The Modified American Standard

3/8 x 10 uses a larger 3/8 inch pin diameter with 10 threads per inch. It became popular as cuemakers started looking for a stiffer hit than 5/16 x 14 could deliver. The larger pin and the coarser thread engage faster and lock the joint faces more aggressively.

The result is a noticeably crisper hit with sharper feedback. You feel the cue ball contact more directly in the bridge hand. Players who like to read the hit through the shaft often prefer 3/8 x 10. Players who find sharp feedback distracting often prefer to step back to a 5/16 x 14.

3/8 x 10 is the default pin on a large share of custom and semi-custom American cues, and is widely available as an aftermarket shaft option from most major shaft makers.

Radial Pin: The Predator Signature

The Radial pin uses a radial thread profile rather than the standard 60 degree V-thread used by 5/16 x 14 and 3/8 x 10. The pin engages quickly and centers itself with very high precision because the radial profile lets the threads seat without binding.

Predator helped popularize the Radial pin and uses it on many of their cue families. The hit is firm but smooth, with less of the sharp shock you can get from a coarse-thread joint. Because radial threading is precision-machined, the joint is exceptionally repeatable. A shaft swap on a radial joint cue feels identical every time, which matters for players who own multiple shafts and want consistent contact behavior.

If your cue has a Radial pin, your shaft options are still strong because every major aftermarket shaft maker offers Radial as a build option. Just be aware that Radial threads are not interchangeable with 3/8 x 10 even though the visual dimensions look similar.

Uni-Loc and Uni-Loc Quick Release

Uni-Loc is a precision joint system designed for fast assembly. The standard Uni-Loc pin uses a four-turn release pattern. The Uni-Loc Quick Release variant lets you assemble or break down the cue in roughly one full turn.

The hit on a Uni-Loc joint is firm and quiet, with very low vibration. Many modern Predator cues, particularly the P3, BLAK, and Throne families, ship with Uni-Loc joints. The Uni-Loc system is also common on a long list of premium production builds because it gives a near-custom feel without the cost of full custom joint work.

Practical advantages matter here too. Uni-Loc assembly is fast enough that tournament players who break down their cue between matches actually save real time. Quick Release variants are even faster, and are popular with players who travel often and assemble multiple times per day.

Other Pin Types You Will Run Into

A handful of other pin formats show up on specific brands. Mezz uses its own Wavy Joint pin on most of its cue families, and it is not interchangeable with Radial, Uni-Loc, 5/16 x 14, or 3/8 x 10 without an adapter. Some European builds use a 5/16 x 18 standard. A few custom makers run their own proprietary threading for the cleanest possible factory fit.

The takeaway is simple. If you do not already know the pin on your cue, look at the threaded stud on the butt and the matching insert in the shaft. The pin type controls every shaft decision you will ever make on that cue.

How to Pick the Right Pin for Your Next Cue

Start with the hit you want. If you like a classic, slightly cushioned American feel, stay with a 5/16 x 14 joint or step up to a 3/8 x 10 for sharper feedback. If you want a precision-feeling, repeatable joint that pairs naturally with multiple shafts, Radial or Uni-Loc is the cleanest path. If you assemble and break down your cue multiple times a day, the Quick Release variants will save you real time over a tournament weekend.

Then think about future shaft compatibility. If you plan to own multiple shafts or upgrade later, pick a pin that the major aftermarket shaft makers all support without an adapter. Today that is 5/16 x 14, 3/8 x 10, Radial, and Uni-Loc. Anything outside that group is fine for a single-shaft player but limiting if you want options.

The joint pin is not glamorous and it does not get the marketing budget that carbon shafts and low-deflection tips do, but it quietly decides what your cue feels like at impact and what you can do with the cue five years from now. Pick it on purpose and the rest of the build becomes easier to align.