Choosing the right golf ferrule seems like a tiny detail, but getting it wrong can turn a simple club repair or custom build into a frustrating mess. That little plastic ring serves an important purpose, and selecting the correct size is essential for a clean, professional finish. This guide will walk you through exactly how to determine the ferrule size you need, breaking down the measurements, tools, and steps so you can get the job done right the first time.
First, let’s get on the same page. A golf ferrule is that small, typically black, plastic or vinyl ring that sits right where the golf shaft enters the hosel (the socket-like part) of the clubhead. While many golfers think it’s just for looks, it serves a couple of simple but important functions:
Ultimately, a properly fitted ferrule is the mark of a well-built golf club. A mismatched or poorly installed one looks amateurish and can even be distracting when you’re standing over the ball. It’s a finishing touch that separates a professional build from a sloppy one.
To pick the right ferrule, you need to understand the three measurements that define its size. Knowing what they are and how they relate to your specific shaft and clubhead is the entire game. For this, a set of digital calipers is your best friend. While you can sometimes find specs online, measuring yourself is the only way to be 100% certain.
This is it - the single most important dimension. The Inside Diameter (ID) of the ferrule must match the tip diameter of your golf shaft. If the ID is too small, you won’t be able to get it on the shaft without breaking it. If it’s too big, it will be loose and rattle around, defeating its purpose.
Golf shafts come in two primary tip styles, and your ferrule choice depends on which one you have:
So, the first rule is simple: Match the ferrule’s ID to your shaft’s tip diameter specification. If you’re working with a .370” parallel tip iron shaft, you need a .370” ferrule.
The Outside Diameter (OD) of the ferrule should ideally match the outside diameter of the hosel where the ferrule will sit. This creates that beautiful, seamless transition with no lip or edge.
Here’s the thing: while there are standard shaft tip sizes, hosel ODs can vary widely between different club manufacturers and even different models from the same brand. That's why it's not always possible to find a ferrule with a perfect OD match out of the box.
So what do you do? Always choose a ferrule with an OD that is slightly larger than your hosel’s OD. This is intentional. After the epoxy cures, club builders "turn down" the ferrule. This process involves sanding or grinding the ferrule so it becomes perfectly flush with the hosel metal. You can do this carefully with fine-grit sandpaper or more quickly on a belt sander with the club turning. This step is what makes a build look custom and professional.
The length of the ferrule is mostly a matter of personal preference and style. It doesn't significantly affect performance.
Ready to get it right? Follow these simple steps.
Start with the most critical part. Your goal is to find out if your shaft is .335", .350", .370", or .355" taper.
Next, use your digital calipers to measure the OD of the hosel on your clubhead. Be sure to measure the exact part of the hosel where the top of the ferrule will rest. Write this number down. When shopping, look for ferrules with an OD that is this size or, more likely, slightly larger. A common iron hosel OD is around .540". So, a ferrule with a .545" or .550" OD would be a perfect candidate for turning down.
This is the fun part. With your ID and target OD in mind, you can shop for a ferrule that matches your desired aesthetic. Do you want a short, clean, modern look? Aclassic mid-length? Or a long, retro ferrule with colorful trim rings? The choice is entirely yours.
Let's say you are reshafting your Titleist irons with KBS Tour steel shafts and want to replace the ferrules.
You’ve found your perfect ferrule. By following this process, you’ve eliminated the guesswork and ensured your clubs will have a clean, professionally installed look.
Determining the right ferrule size comes down to a systematic process: match the inside diameter to the shaft tip, find an outside diameter that's the same size or slightly larger than the hosel, and then pick a length that fits your personal style. Having a set of digital calipers makes this job unbelievably simple and ensures you order the right parts from the start.
Spending a few minutes on preparation saves a ton of headache later. That said, sometimes you just get stuck on a weird equipment question in the middle of a project. For those moments when you need a quick, reliable answer - whether it’s about ferrule choice, epoxy types, or swing weight adjustments - I'm building Caddie AI to be your 24/7 golf expert. You can get instant, coach-level advice right on your phone, so you can spend less time searching forums and more time perfecting your passion, whether that’s playing on the course or tinkering in the garage.
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