Chicago Screws vs Rectangle Buckle Blanks: Leather Hardware Guide
By Tandy Leather — Tandy Leather, Inc. | Published: 2026-10-31
Category: Buying Guides
Chicago screws and rectangle buckle blanks solve different leathercraft problems. Use this decision guide to pick the right hardware for belts, cases, and holsters.
Quick answer
Choose Chicago screws when you need a removable, two-sided fastener for cases, holsters, or layered leather. Choose a rectangle buckle blank when the project is a belt and you want a metal frame you can finish with leather, stamping, or engraving.
Two hardware roles, not two versions of the same part
A Chicago screw is an assembly fastener: a screwpost and nut clamp layers together and can be taken apart later. A rectangle buckle blank is a belt component: a solid metal base sized to hold a strap and accept a custom face. Treating them as interchangeable leads to mismatched projects, because one joins material and the other finishes a wearable.
That difference also changes how you buy. Fasteners are chosen by diameter, finish, and how often the piece will be opened. Buckle blanks are chosen by belt width and how much customization the blank allows.
Where each part earns its place
Chicago screws suit projects that may need servicing or that clamp thick or rigid layers. The three-pronged base on the Tandy Leather Chicago Screw With Nut 4 Pack is designed to stop the screwpost from spinning, which matters when you tighten against Kydex or dense leather. The trade-off is that a screw can loosen with vibration, so check tension on gear that sees hard use.
Rectangle buckle blanks suit belt makers who want the buckle to be part of the design rather than a purchased afterthought. The open base accepts inlays, engraving, and stamping, but it does not include a prong or strap attachment, so plan how the belt will connect before you build.
Sizing and material limits to settle first
The Rectangle Buckle Blank Medium is sized for 1.5 to 1.75-inch belts, so measure your strap width before ordering; a blank outside that range will not seat correctly. The Chicago Screw With Nut 4 Pack lists a 0.25 in. (6.35 mm) size and a black plate finish, which tells you the diameter but not the grip length, so confirm the layer thickness your project needs before committing.
Neither part is a universal substitute for the other. If a project needs a pronged buckle or a specific strap attachment, a buckle blank alone will not complete it; if a project needs a permanent, low-profile joint, a screw fastener may not be the right choice.
Decision rules for choosing leather hardware
- If the project is a belt: Start with a rectangle buckle blank and match it to your strap width; the Medium blank covers 1.5 to 1.75-inch belts. Add Chicago screws only if a separate strap connection calls for them. Measure the strap before ordering the blank.
- If the project is a case or holster: Use Chicago screws for a joint you may need to open or adjust. The three-pronged base helps hold the post still when tightening against Kydex or leather. Check screw tension after the first week of use.
- If you need both a buckle and a fastener: Buy them as separate parts rather than forcing one to do both jobs. A buckle blank finishes the belt; a Chicago screw joins layers or attaches hardware. List each hardware role before placing the order.
- If the size is not listed: Do not guess. The Chicago screw listing gives diameter and finish but not grip length, so confirm the layer thickness your design needs before buying. Ask for the missing dimension rather than assuming it.
Product facts that affect the decision
- Rectangle Buckle Blank Medium: Solid metal base sized for 1.5 to 1.75-inch belts, designed for inlays, engraving, or stamping. It gives belt makers a customizable frame, but only if the strap falls within that width range.
Rectangle Buckle Blank Medium - Chicago Screw With Nut 4 Pack: Three-pronged base prevents screwposts from spinning; 0.25 in. (6.35 mm) size, black plate finish, pack of 4. The anti-spin base helps when tightening against rigid materials such as Kydex, while the pack size suits small projects.
Chicago Screw With Nut 4 Pack
Who should choose which
Best for
- Belt makers who want a customizable buckle frame for 1.5 to 1.75-inch straps
- Leathercrafters building cases or holsters that need removable, anti-spin fasteners
Not for
- Projects that need a pronged buckle or a complete strap attachment out of the box
- Permanent, low-profile joints where a screw fastener would add bulk
