How to Attach a Double-Sided Bolt Snap to Leather

By Tandy Leather — Tandy Leather, Inc. | Published: 2026-10-21

Category: How-to Guides

Learn step-by-step how to attach a double-sided bolt snap to leather for keychains, leashes, and bags. Includes tool tips, common mistakes, and hardware guidance.

Quick Answer

To attach a double-sided bolt snap, punch a snug hole in your leather, insert the bolt, and secure it with the included washer and a firm set. This guide walks you through the process so the snap stays put and releases smoothly.

Choosing the Right Size and Placement

The double-sided bolt snap comes in small, medium, and large sizes, so match the snap to the thickness of your leather and the weight it will carry. A small snap suits light keychains or pet ID tags, while a medium or large snap handles leashes and bag straps better.

Place the snap where the leather is thick enough to hold the bolt without tearing—usually at least 2–3 mm. Avoid placing it too close to an edge or a stitch line, because the hole can weaken the area and cause the leather to pull apart.

Tools You Will Need and Why They Matter

You will need a rotary punch or a hollow punch that matches the bolt diameter, a mallet or hammer, and a hard surface like a cutting mat or a piece of scrap wood. The punch must be slightly smaller than the bolt so the leather grips it firmly—too large a hole makes the snap wobble and pull out.

If you are working with thick or stiff leather, consider skiving the area underneath to reduce bulk. This helps the snap sit flush and prevents the leather from bulging around the hardware.

Step-by-Step Attachment Process

Mark the placement: Use an awl or a pen to mark the exact spot where you want the snap. Make sure it is centered and at least 1 cm from any edge to prevent tearing. Double-check the mark against the snap's bolt diameter before punching.
Punch the hole: Select a rotary or hollow punch that is slightly smaller than the bolt shaft. Place the leather on a hard surface and strike the punch firmly with a mallet to create a clean hole. Test the hole on a scrap piece first to confirm the fit.
Insert the bolt: Push the bolt of the snap through the hole from the front (the side that will face outward). Ensure the snap's release button is facing the direction you want for easy operation. If the bolt does not go through easily, enlarge the hole slightly with a round file—do not force it.
Secure the washer: Slide the washer onto the bolt from the back side of the leather. Press it down until it sits flush against the leather. The washer should fit snugly; if it is loose, the hole is too large and you need a smaller punch.
Set the snap: Using a setting tool or a flat punch, tap the washer firmly with a mallet to flare the bolt and lock everything in place. Strike evenly around the washer to avoid tilting. Test the snap by pulling on it; if it moves, give it a few more taps.
Test the release: Press the release button and attach the snap to a ring or strap to ensure it clicks and releases smoothly. If it sticks, check that the washer is not over-tightened and that the bolt is not bent. A smooth release means the snap is installed correctly and will last.

Hardware We Recommend

Double-Sided Bolt Snap: The Double-Sided Bolt Snap is available in small, medium, and large sizes, with dimensions ranging from 2.72 x 0.89 x 0.29 inches to 3.88 x 1.1 x 0.34 inches. Matching the snap size to your leather thickness and project weight ensures a secure hold and smooth release.
Double-Sided Bolt Snap