You’ll see a few names used, depending on the threads and use:

• Stud bolt / double-end stud: Machine threads on both ends, typically used with nuts and washers to clamp parts together.
• Hanger bolt: Wood-screw thread on one end and machine thread on the other for attaching hardware to wood.
• Dowel screw: Wood-screw threads on both ends for wood-to-wood joints, like furniture assembly.

When browsing, match diameter and thread (e.g., M6, M8, or 1/4-20), choose a length that fits your materials, and pick a material—stainless steel for higher corrosion resistance or zinc-plated for general indoor use. Filters can help you narrow by size and finish.

Here’s a simple approach that can work for dowel screws or hanger bolts:

1. Mark and align the locations so both pieces will meet cleanly.
2. Drill pilot holes sized for the wood-thread portion; a pilot roughly 60–75% of the screw’s minor diameter can help, but check the item details and your material.
3. Lubricate lightly (wax or soap) to reduce friction if needed.
4. Drive the fastener using the double‑nut “jam nut” method on the machine-thread end, or a suitable driver. Turn slowly to stay straight.
5. Stop when set to the desired depth, avoiding overtightening.

Wear eye protection and work at a controlled speed. These steps can help reduce splitting and improve alignment, but techniques may vary by wood density and screw design.

Double‑ended studs are handy when you want a strong, serviceable connection without a bolt head getting in the way.

• Assembly with nuts: Use nuts and washers on one or both ends to clamp parts, common in machinery and fixtures.
• Easy maintenance: Components can be removed without disturbing threads in the base material.
• Precise positioning: Fixed studs can help with alignment when parts need to go back in the same place.

To choose, match the thread size/pitch, select a length that provides enough engagement for the nuts, and consider material/finish (stainless for higher corrosion resistance, zinc-plated for general indoor use).

For wood projects, you’ll typically see two styles:

• Dowel screws: Wood‑screw threads on both ends for wood‑to‑wood joints like furniture legs and rails.
• Hanger bolts: Wood‑screw thread on one end and machine thread on the other, letting you add a nut, washer, or metal fitting.

Look for the right diameter (e.g., M5, M6, M8 or 1/4‑20), length (measured tip‑to‑tip), and material (stainless for higher corrosion resistance; zinc-plated for typical indoor use). Pre‑drilling pilots helps reduce splitting. Filters can help you sort by size, length, and finish to fit your project.

They sound similar but serve different jobs:

• Double‑ended bolt snaps: Spring‑loaded clips with triggers on both ends. They attach quickly to rope, chain, or rings for utility tasks like hanging buckets or managing gear. They don’t screw into materials.
• Double‑ended studs/bolts: Threaded fasteners used with wood or nuts/washers to create clamped, permanent-style connections.

Choose by application: pick bolt snaps for quick clipping and check the size and any load guidance in the product details; pick studs or hanger/dowel screws for structural fastening and match the thread size, length, and material to your project.