HILLMAN No. 1/4-20 in. X 6 in. L Combination Round Head Zinc-Plated Steel Machine Screws 100 pk

For dependable, long-lasting connections in metal assemblies, the Hillman No. 1/4-20 x 6 in. Combination Round Head Steel Machine Screws are built to perform. This 100-pack boxed set teams durable zinc-plated steel with a versatile combination drive, giving you a practical, ready-to-use solution for a wide range of projects—from shelving and enclosures to brackets and equipment mounts.

Why this screw stands out

• Coarse 1/4-20 thread provides solid grip in tapped holes and standard nuts, delivering reliable seating in a variety of metal-to-metal applications.
• 6 in. length offers deep reach for thicker assemblies, giving you flexibility when mounting through multiple components or thicker panels.
• Round head with zinc-plated finish combines a clean, professional appearance with corrosion resistance suitable for indoor and outdoor settings.
• Combination drive accepts multiple bit types, simplifying installation when your tool set is varied. Note: driver bit is not included.
• Versatile, boxed 100-pack ensures you have an ample supply for ongoing projects, repairs, or shop inventory, without frequent trips to the store.
• Not self-drilling or self-tapping—requires a pre-drilled pilot hole or threaded engagement, which helps prevent push-through and maintains precise alignment for critical assemblies.

Specifications at a glance

• Brand: Hillman
• Size / Thread: 1/4-20
• Length: 6 in
• Head type: Round
• Material: Steel
• Finish: Zinc-Plated
• Drive style: Combination (slotted/Phillips compatibility)
• Self-drilling: No
• Self-tapping: No
• Applications: Indoor and outdoor use with nuts or tapped holes
• Count: 100 per box

Use cases — where these screws really shine

• Mounting brackets to metal framing in storage systems, machinery housings, or equipment enclosures.
• Attaching components to stamped or machined metal panels where a strong, clean finish is desired.
• Securing hardware in DIY projects that require a long, sturdy fastener through multiple metal layers.
• Repairs and replacements for shop-built shelving, workbenches, or electronics racks that rely on durable machine screws.

Practical tips for best results

• Pair these screws with compatible nuts or tapped holes to create secure, load-bearing joints.
• Use washers when fastening through softer materials or where surface load distribution matters.
• Since they’re not self-drilling, pre-drill holes with an appropriately sized bit to prevent thread damage and ensure alignment.
• Choose the correct length for your stack-up; 6 in. is ideal for assemblies where multiple components require a deep, clean bite.
• Store and organize the 100-pack in a labeled box for quick access during ongoing projects.