Chicago Screws vs Rivets for Leather Belts: Which Fastener Should You Use?

Chicago screws (also called sex bolts, book screws, or post-and-screw fasteners) and rivets do the same job — hold two layers of leather together — but they fail in opposite ways and excel at opposite use cases. This guide settles the trade-off for belts, holsters, collars, and wallets.

What each one actually is

Chicago screw

A two-piece threaded fastener: a hollow post on one side, a screw cap on the other. Pass the post through both layers, thread the cap from the back, tighten with a flathead screwdriver. Removable any time. Sold in solid brass, stainless steel, nickel-plated, and antique finishes.

Rivets

Permanent mechanical fasteners. Double cap rivets snap together with a hand setter. Solid copper rivets use a burr and are peened with a ball-peen hammer (we cover the full process in our copper rivet tutorial). Once set, both require destruction to remove.

Strength comparison

Fastener	Shear strength	Pull-through resistance
Solid copper rivet (#12)	Excellent	Excellent (burr distributes load)
Double cap rivet	Good	Moderate (caps can pop under shear)
Chicago screw (solid brass)	Good	Good (large head and post flange)
Chicago screw (plated zinc)	Poor	Poor (thread strip risk)

For load-bearing builds — gun belts, holsters, dog collars on large breeds — solid copper rivets win on raw strength. Chicago screws in solid brass are close enough that the difference rarely matters in everyday use.

Repairability: the deciding factor

This is where chicago screws earn their place. A belt with a Chicago-screw billet can be:

• Buckle swapped without cutting stitching.
• Re-sized at the billet by re-punching a new screw hole.
• Disassembled for conditioning the strap interior.

A riveted billet can do none of the above. To swap the buckle you grind off the rivet head, drill out the shaft, and re-punch — a 15-minute repair on screws becomes a destructive process on rivets.

Failure modes

Chicago screws

The #1 failure: screws back out. Vibration and flexing slowly unthread the cap. Fix with a drop of Loctite Blue (242) on the threads — it locks the screw without bonding permanently. Reapply when you next disassemble.

Avoid: plated zinc chicago screws. The threads strip in 5–10 cycles. Solid brass or stainless only.

Rivets

Double cap rivets occasionally pop their cap if set on too-thin leather or with a worn setter. Solid copper rivets fail by shaft fatigue if undersized for the load. Both are far less likely to fail than a strap mounted with cheap chicago screws.

Looks and feel

Chicago screws give a clean, finished look on both sides — useful when both faces of the strap show (think reversible belts, watch straps, dog collars).

Double cap rivets give matched smooth caps on both faces but in a smaller, more decorative footprint.

Solid copper rivets show a hand-peened head on one side and a polished burr on the other — the traditional saddler aesthetic. Loved by heritage and Western builds.

Use case recommendations

• Belt billets (buckle attachment): Chicago screws. The buckle will outlast 2–3 straps; let it be swappable.
• Holsters and sheaths: Solid copper rivets. Permanent load, no reason to disassemble.
• Dog collars: Chicago screws on the buckle billet, rivets at hardware attachment points.
• Wallets and small goods: Double cap rivets — clean and decorative.
• Watch straps: Chicago screws (lets the wearer change spring bars or sizing).
• Heavy work belts and gun belts: Solid copper rivets at billet, optional Chicago screw if the customer wants buckle swapping.

Hardware sourcing

For solid brass chicago screws and rivets, the same suppliers cover both — Buckleguy, Weaver, and Rocky Mountain Leather. Stick to solid brass or stainless; see our brass vs plated breakdown for finish details.

Key takeaways

• Rivets are permanent and slightly stronger; chicago screws are removable.
• Use chicago screws anywhere the customer might want to disassemble (belts, collars, watch straps).
• Use rivets for one-and-done permanent builds (holsters, wallets, sheaths).
• Solid brass or stainless only — avoid plated zinc in both fastener types.
• Loctite Blue (242) prevents chicago screw back-out.

FAQ

Are chicago screws strong enough for a gun belt?

Solid brass chicago screws (#10 or larger post) handle gun belt loads, but most professional holster makers still prefer copper rivets for the permanence and the no-back-out guarantee.

Can I mix chicago screws and rivets on one piece?

Yes — common practice on premium belts. Rivets where strength matters, chicago screws where adjustability matters.

What size chicago screw for a belt billet?

Most belts use #8 (5 mm post diameter) for normal weight, #10 (6 mm) for heavy belts. Match post length to total leather thickness — the screw should bottom out without protruding.

Conclusion

Pick your fastener based on what the customer will need ten years from now: rivets if it should never come apart, chicago screws if it should come apart cleanly. For deeper dives on rivet types and installation, browse the full rivets, snaps & fasteners category.