The connection you have with your golf club starts with the grip, yet one of the most overlooked specifications - the grip’s core size - can completely change how every club in your bag feels and performs. This small number printed on the inside lip of a grip is more than just a manufacturing detail, it's a vital piece of the equipment puzzle that directly influences a club's final thickness and, by extension, your control over the clubface. This guide will walk you through exactly what core size is, why it matters, and how you can use this knowledge to get a better, more consistent feel from your golf clubs.
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What Exactly Is Grip Core Size?
In simple terms, a golf grip’s core size is the measurement of its inside diameter. Think of it as the size of the hole that runs through the middle of the grip, which is designed to be installed onto the butt end of a golf shaft. This number is almost always printed on the inner edge of the grip’s opening.
You’ll typically see a couple of numbers:
.580" (fifty-eight hundredths of an inch)
.600" (six-tenths of an inch)
Occasionally, you might also find .560” or .620” sizes, but .580 and .600 are by far the most common in the golf industry. The number simply corresponds to the outside diameter of the shaft butt it was designed to fit onto.
For decades, .600” has been the industry standard for the butt diameter of most men’s steel shafts, while many graphite shafts and some lightweight steel shafts were made with a smaller .580” butt diameter. Today, most shafts, both steel and graphite, feature a .600” butt diameter, but it's not universal.
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This is where things get interesting and where a bit of knowledge can make a huge difference. The core size of a grip directly influences its wall thickness. Because most golf grips are manufactured to have a consistent outer diameter (e.g., standard, midsize, jumbo), a grip with a smaller inner diameter (.580") must have thicker rubber walls than a grip with a larger inner diameter (.600") to achieve that same outer size.
Here’s a simple analogy: Imagine two donuts. They are both the same size on the outside, but one has a very small hole in the middle, while the other has a much larger hole. The donut with the small hole must have more "donut" (a thicker wall) to make up for the smaller opening.
This difference in wall thickness is what allows you to fine-tune the final size of your grip.
How Core Size Affects Final Grip Thickness
Understanding this relationship helps you customize your grip feel. Let's look at the most common scenario: installing a grip on a shaft with a .600" butt diameter.
Installing a .600" Core Grip on a .600" shaft: This is a standard fit. The grip is designed for the shaft, and its final installed size will be exactly as the manufacturer intended (e.g., "standard" size).
Installing a .580" Core Grip on a .600" shaft: When you force a .580" grip onto a larger .600" shaft, the grip has to stretch. Because the .580" grip has thicker walls to begin with, this combination results in a final grip size that is about 1/64" larger than standard. This makes the grip feel slightly "built-up," without adding any extra layers of tape. This is a common technique used by club builders to create an "in-between" size for golfers who feel standard is too small and midsize is too big.
Conversely, the same logic applies if you have a .580” shaft:
Installing a .580" Core Grip on a .580" shaft: This is the standard fit, resulting in a true standard size.
Installing a .600" Core Grip on a .580" shaft: Placing a grip with a larger opening onto a smaller shaft results in a final size that is 1/64" smaller than standard, creating an "undersize" grip. This setup is perfect for golfers with smaller hands who need a thinner grip to maintain control.
This subtle difference might not sound like much, but in a game of inches, a fraction of an inch in your hands can have a major impact on your ability to control the clubface and swing with confidence.
How to Choose the Right Grip Core Size: A Step-by-Step Guide
Choosing the right core size isn’t a guessing game, it’s a process of matching your equipment to your preferences. Here’s how you can approach it like a pro.
Step 1: Identify Your Shaft's Butt Diameter
Before you can choose a grip, you need to know what you’re putting it on. Your shaft's butt diameter is the starting point. Here are a few ways to find it:
Check the Shaft Label: Some shafts have their specifications, including butt diameter, printed on them. This is often the easiest and quickest way.
Look Up Manufacturer Specs: If the label is worn off or doesn't have the info, do a quick search online for your club model and the stock shaft it came with. The manufacturer's website or spec sheets on distributor sites almost always have this information.
Ask a Club Fitter or Your Pro: If you're unsure, any qualified club technician or golf professional can measure it for you with a set of calipers in seconds.
Remember, most modern standard clubs will have a .600" butt diameter, but it's always best to be sure, especially if you have custom, older, or lightweight graphite shafts.
Step 2: Determine Your Desired Final Grip Size
Now, think about feel. Do your current grips feel too thin, too thick, or just right? An improperly sized grip can cause a number of issues. Grips that are too thin may cause your hands to become overly active, leading to hooks. Grips that are too thick can restrict your hand and wrist action, often causing pushes or fades.
Based on your feel and shot patterns, you can decide if you want:
Undersize Grip: Thinner than standard.
Standard Grip: The baseline for most golfers.
Built-Up Standard: A "standard plus" size, slightly thicker than normal.
Midsize or Jumbo Grip: Significantly thicker for larger hands or to quiet the hands down.
Remember that layers of grip tape can also be used to build up a grip. One layer of build-up tape adds approximately 1/64” to the final size. So, you can combine core size and tape layers to get to your perfect fit.
Step 3: Put It All Together and Make Your Choice
With your shaft diameter and desired feel in mind, you can now select the right core size. Here’s a quick reference:
If you have a .600” Shaft Butt...
For a Standard feel: Use a .600 Core Size grip.
For a Slightly Thicker (+1/64”) feel: Use a .580 Core Size grip.
For an even Thicker (+1/32”) feel: Use a .600 Core Size grip with one extra wrap of tape.
If you have a .580” Shaft Butt...
For an Undersize (-1/64”) feel: Use a .600 Core Size grip.
For a Standard feel: Use a .580 Core Size grip.
For a Slightly Thicker (+1/64”) feel: Use a .580 Core Size grip with one extra wrap of tape.
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Round Grips: These are perfectly circular on the inside and outside, offering a uniform feel all the way around. They are the most common style and are often preferred by players who like to open or close the clubface for creative shot-making.
Ribbed Grips: These grips have a small, raised seam or "rib" that runs along the underside. This rib serves as a tactile reminder for consistent hand placement every single time you address the ball. Many amateurs and pros alike love this feature for promoting a neutral, repeatable grip.
This is important because ribbed grips must be installed perfectly straight. If the rib is even slightly off-kilter, it can influence you to set up with an open or closed clubface. When stretching a .580 ribbed grip onto a .600 shaft, the installer must be extra careful not to twist the grip and misalign the rib.
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Understanding golf grip core size moves you from being a passive consumer to an informed player who takes control of their equipment. This tiny number is your tool for fine-tuning the connection to your club, allowing you to dial in a feel that promotes confidence, control, and consistency from tee to green. Don't overlook it the next time you regrip your clubs.
Figuring out how small equipment details might be affecting your game is part of the journey to becoming a better golfer. If you ever find yourself wondering about questions like this, or you feel stuck on the course and need a second opinion, we designed Caddie AI to be your personal golf expert. You can ask anything from equipment inquiries to on-course strategy in seconds, getting clear advice that helps remove uncertainty so you can commit to every swing.
Spencer has been playing golf since he was a kid and has spent a lifetime chasing improvement. With over a decade of experience building successful tech products, he combined his love for golf and startups to create Caddie AI - the world's best AI golf app. Giving everyone an expert level coach in your pocket, available 24/7. Caddie's mission is simple: make world-class golf advice accessible to everyone, anytime.
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