What Is a Tapered Pin and How Is It Used in Clock Repair?

What Is a Tapered Pin?

When working with mechanical clocks, especially vintage or antique models, you’ll often encounter small components that play big roles. One of the most overlooked—but essential—parts in clock assembly is the tapered pin. Although simple in design, tapered pins hold the structure of a clock together and allow for secure, reversible connections in various clock mechanisms.

In this article, we’ll cover what a tapered pin is, why it’s used in clock repair, how to measure and install one, and where to get the right replacements for your project.

Clock Tapered Pin Usage

A tapered pin is a small, cylindrical metal pin that narrows at one end. Clockmakers use it to secure parts of a clock movement together—such as holding levers, plates, or gears in place. The tapering ensures that the pin locks tightly into place when inserted into a properly sized hole, yet it can also be removed if future disassembly is needed.

Think of it as the mechanical version of a reusable fastener. Unlike a screw or nail, a tapered pin doesn’t require threads or adhesives. It relies solely on friction and the conical shape to hold everything together.

Where Are Tapered Pins Used in a Clock?

Tapered pins are most commonly found in mechanical clock movements, especially in:

• Pivot posts and levers
• Striking and chiming racks
• Clock plates and bridges
• Escapement mechanisms
• **Hammer assemblies**

You’ll usually see them used in American-made mechanical clocks, though European makers (like Gustav Becker or Hermle) also use tapered pins in some models. If you’re working on a Mantel/Wall clock, or Grandfather clock with a mechanical movement, there’s a strong chance it uses one or more tapered pins.

How Do You Measure a Tapered Pin Correctly?

To replace or match a tapered pin, you’ll need to measure it properly:

1. Determine the length – Use a caliper to measure the full length of the pin from the thickest end to the tip.
2. Find the thickest diameter – This is the part that fits snugly into the outer edge of the hole.
3. Check the taper rate – Most clock repair pins have a standardized taper (usually 1:48), which means 1 unit of taper over 48 units of length.

Measuring from both ends ensures you find the right fit. Undersized pins won’t grip, and oversized pins can damage the part or stretch the hole.

How Do You Insert and Remove a Tapered Pin?

To insert a tapered pin:

• Align the parts being connected and insert the narrow end of the pin into the pre-drilled tapered hole.
• Gently tap the thicker end with a small hammer or clock repair tool until it fits snugly.
• Don’t force it—if the pin feels too tight, switch to a smaller size.

To remove a tapered pin:

• Identify which end is the small end (usually the side not peened or flared).
• Use a small pin punch or fine tool to push the pin out from the small end.
• Apply steady pressure, not brute force—you don’t want to damage the surrounding movement parts.

Pro tip: Always punch in the direction opposite the taper. That’s the key to successful removal without warping or bending components.

What Material Are Clock Tapered Pins Made Of?

Most quality clock tapered pins are made from tempered steel or brass. Steel pins offer strength and corrosion resistance, ideal for long-term mechanical integrity. Brass pins are softer and less likely to damage delicate components—making them great for antique or fragile clock movements.

You can also find assortment kits that include a variety of lengths and diameters, ideal for repair shops or clockmakers who work on multiple clock types.

Can You Reuse a Tapered Pin?

Yes—but with caution. If a tapered pin has not been bent, peened, or damaged during removal, you can reuse it. Always inspect for wear or burrs. If the pin looks deformed or doesn’t fit as snugly as before, it’s safer to use a new one.

What Problems Can Happen with Clock Tapered Pin Usage?

Incorrectly installed or worn tapered pins can lead to several issues, including:

• Loose clock components
• Gear slippage or alignment errors
• Impaired striking or chiming function
• Increased wear and tear on bushings or pivots

Skipping this tiny part can cause serious problems over time. Precision matters—even with something as small as a pin.

What Tools Do You Need to Work with Tapered Pins?

Here’s a short list of useful tools:

• Clockmaker’s hammer
• File (for cleaning pin ends)
• Magnifier or loupe (for inspection)

These tools help ensure accuracy, protect delicate clock parts, and make the process smoother.

Where Can You Buy Quality Tapered Pins?

Clockworks.com offers a wide selection of replacement tapered pins in steel and brass, available in standard taper sizes and variety packs. Whether you’re repairing a single mantel clock or servicing dozens of movements, having the right pins on hand makes your work faster, cleaner, and more professional.

Our pins are sourced specifically for horological use and work with American and German-made clock movements alike.

Clock Tapered Pin Usage Conclusion: The Smallest Part with a Big Job

Tapered pins may be one of the smallest components in a mechanical clock, but they perform a vital role. Knowing how to identify, measure, install, and remove them correctly can make the difference between a smooth-running movement and a frustrating repair job.

Treat these pins with the same care and precision as any gear or spring, and your clock will thank you with years of flawless ticking.

Need help choosing the right size or kit? Email us at clockworks@clockworks.com or visit Clockworks.com to shop trusted clock repair tools and parts.

Updated on: 28/09/2025