Bow Sight Pin Sizing: 0.010 vs 0.019 Pins (Which to Pick)

Setting up a bow sight and surprised that the pins come in different sizes? Sight pin sizing is one of those small details that makes a real difference in your accuracy — yet almost no one explains it. The size refers to the diameter of the glowing fiber-optic pin, and it controls two things you care about: how precisely you can aim, and how easily and brightly you can see the pin. Pick the wrong size and you will either struggle to see your pin in low light or cover up the very spot you are aiming at.

Here is the trade-off in plain English: a smaller pin (like 0.010 inch) is finer, so it covers less of the target and lets you aim more precisely — great for target shooting and longer shots. A bigger pin (like 0.019 inch) gathers more light and is easier to pick up quickly, which is perfect for hunting and dim conditions. Neither is “better”; each fits a purpose.

In this guide, you will learn what sight pin sizes mean, how to choose the right one, and how brightness and precision balance out. We will compare sizes in clear tables, cover setups for hunting versus target, and share pro tips and mistakes. By the end, you will pick the perfect pins for your shooting. Let us dial it in.

What Is Sight Pin Sizing?

Sight pin sizing refers to the diameter of the glowing fiber-optic pin on your bow sight. The two most common sizes are 0.010 inch (smaller, finer) and 0.019 inch (larger, brighter). The number is literally the thickness of the fiber, which determines how big the bright dot appears when you aim.

It matters because the pin’s size affects both how much of the target it covers and how bright it looks. A thinner pin shows a smaller, more precise aiming point but is a little dimmer. A thicker pin is brighter and faster to find, but it covers more of the target, which can hide a small bullseye at distance.

Choosing the right size is a simple but real accuracy decision. If you are buying or replacing pins, you can see fiber optic sight pins options on Amazon. New to sights? See our single vs multi-pin sight guide.

“Pin size is the quiet trade-off between precision and brightness. A thin pin lets you aim small; a thick pin lets you see fast. The best choice depends on whether you value pinpoint accuracy or quick, bright aiming.”

Why Pin Size Matters

Pin size has a direct effect on your aiming, especially at distance and in changing light. Here is why it matters:

• Precision. A smaller pin covers less of the target, so you can aim at a finer point — important for small targets and long range.
• Brightness. A larger pin gathers more light and glows brighter, making it faster to acquire and better in low light.
• Target coverage. At long distances, a big pin can completely cover a small bullseye, making precise aiming hard.
• Speed. In a fast hunting moment, a bright, easy-to-see pin helps you aim quickly.

So the right size depends on your priorities: fine aiming (small pin) or bright, fast aiming (large pin). Many archers blend both, as we will see. For low-light aiming, brightness is king.

Small Pins (0.010″)

A 0.010-inch pin is the finer option. Because the fiber is thinner, the glowing dot is smaller and covers less of the target. This lets you aim at a more precise point, which really helps for target archery, small targets, and longer distances where a big pin would block the bullseye.

Best for: target archers, long-range shooting, and precise aiming.

• Pros: Most precise, covers little of the target, ideal for distance and small aiming points.
• Cons: Dimmer than a large pin, a bit harder to pick up fast or in low light.

Recommendation: Choose 0.010″ pins if precision is your priority — target shooting, 3D, or any long-range work where you need to aim small. Many target sights use thin pins (or a fine dot/scope) for exactly this reason.

Large Pins (0.019″)

A 0.019-inch pin is the brighter, easier-to-see option. The thicker fiber gathers more light and glows boldly, so you can find and settle the pin quickly — a big advantage when hunting, in low light, or when you need a fast shot. The trade-off is that it covers more of the target at distance.

Best for: hunters, low-light shooting, and fast target acquisition.

• Pros: Bright and easy to see, fast to acquire, excellent in low light (dawn/dusk), forgiving for quick shots.
• Cons: Covers more of the target, less precise at long range on small targets.

Recommendation: Choose 0.019″ pins for hunting, where speed and low-light visibility matter most — especially since deer move at dawn and dusk. The brightness is worth the slight loss of precision at typical hunting ranges.

Key Factors in Choosing

Beyond the size number, weigh these factors when picking pins:

• Your discipline. Target/3D leans small (precision); hunting leans large (brightness/speed).
• Your shooting distance. Longer shots at small targets favor thin pins; close shots favor bright pins.
• Light conditions. Low-light hunting favors larger, brighter pins; bright daylight target favors thin pins.
• Eyesight. If you struggle to see a thin pin, a slightly larger one helps.
• Mixed setups. Consider a thin top pin and thicker lower pins for versatility.

Match these to your shooting and the choice becomes clear. For the bigger sight picture (single vs multi-pin), see our bow sight guide.

Pin Size Comparison

Hunting vs Target Pins

Not sure what fits your shooting? Take our gear finder quiz.

How to Choose Your Pin Size

1. Define your main use. Hunting (brightness/speed) or target (precision)?
2. Consider your distances. Longer shots at small targets favor thin pins.
3. Factor in light. Low-light hunting wants brighter, larger pins.
4. Decide single-size or mixed. A thin top pin with thicker lower pins suits many hunters.
5. Check your eyesight — pick a size you can see clearly and settle quickly.
6. Add a sight light if needed to brighten thin pins in dim conditions.

Common Mistakes (and Fixes)

• Mistake: Big pins for long-range target. Pin hides the bullseye. Fix: Use thin 0.010″ pins for distance/precision.
• Mistake: Thin pins for low-light hunting. Hard to see. Fix: Use 0.019″ pins (or add a sight light).
• Mistake: Ignoring distance. Fix: Match pin size to how far and how small you aim.
• Mistake: One size for everything. Fix: Consider a mixed thin-top / thick-lower setup.
• Mistake: Forgetting eyesight. Fix: Choose a size you can clearly see and settle.

Pro Tips

• Mix sizes — thin top pin for precision, thick lower pins for speed and brightness.
• Add a sight light to boost thin pins in low light.
• Match pins to distance — the farther and smaller the target, the thinner the pin.
• Test in real conditions (dawn/dusk for hunting) before committing.
• Keep fibers protected — bright fiber optics are what make any pin easy to see.

“There is no universally perfect pin size — only the right one for your light and distance. Aim small with a thin pin when you can see clearly; go bright with a thick pin when light and time are short.”

Real-Life Examples

The long-range target shooter. Priya kept covering the bullseye at 60 yards with thick pins. She switched to 0.010″ pins, and suddenly she could aim at a precise point again — her groups tightened immediately.

The dawn hunter. Marcus struggled to see his thin pins in early-morning light. He moved to bright 0.019″ pins and could pick them up instantly at first light, when deer were moving.

The mixed setup. Dana hunts and shoots 3D. She set a thin top pin for her precise long shots and brighter lower pins for fast, close ones — getting the best of both in one sight.

Frequently Asked Questions

What size bow sight pins should I use?

Use 0.019″ pins for hunting and low-light conditions because they are brighter and faster to see. Use 0.010″ pins for target shooting and long range because they are finer and cover less of the target for precise aiming. Many hunters mix a thin top pin with thicker lower pins.

What is the difference between 0.010 and 0.019 sight pins?

The number is the fiber diameter. A 0.010″ pin is thinner, finer, and more precise but dimmer; a 0.019″ pin is thicker, brighter, and easier to see fast but covers more of the target. Choose thin for precision and distance, thick for brightness and hunting.

Are smaller sight pins more accurate?

They can be, especially at long range and on small targets, because a thin pin covers less of the target and lets you aim at a finer point. But “more accurate” depends on whether you can see the pin clearly — in low light, a brighter larger pin may serve you better.

What pin size is best for bowhunting?

0.019″ pins are usually best for bowhunting because they are bright and quick to acquire, which matters at dawn and dusk when game is active and shots happen fast. Some hunters use a thin top pin for precise longer shots and brighter lower pins for close, fast ones.

Do thinner pins work in low light?

Thinner 0.010″ pins are dimmer and harder to see in low light. If you want their precision but hunt at dawn or dusk, add a sight light to brighten them, or use larger pins. For pure low-light visibility, 0.019″ pins are the easier choice.

Can I mix pin sizes on one sight?

Yes, and many hunters do. A common setup is a thin 0.010″ pin on top for precise longer shots and brighter 0.019″ pins below for close, fast shots. This gives you precision when you have time and brightness when you need a quick, easy-to-see aiming point.

Final Verdict + Checklist

Sight pin sizing is a simple trade-off between precision and brightness. Thin 0.010″ pins aim small and suit target and long range; thick 0.019″ pins are bright and fast and suit hunting and low light. Match the size to your discipline, distance, and light — or mix sizes for the best of both. The right pins make aiming faster and more accurate.

Your quick checklist:

• ✅ 0.010″ = precise, covers little (target, long range).
• ✅ 0.019″ = bright, fast to see (hunting, low light).
• ✅ Longer/smaller targets favor thin pins.
• ✅ Low-light hunting favors thick pins.
• ✅ Mix a thin top pin with thick lower pins for versatility.
• ✅ Add a sight light to brighten thin pins.
• ✅ Choose a size you can see and settle clearly.

Ready to set up your sight? Pair this with our single vs multi-pin sight guide and how to aim a bow guide.