Thread Inserts for Metal — Strong, Reliable Thread Reinforcement
Threaded inserts restore or create high-strength internal threads in metal. They distribute load, resist wear and vibration, and let you assemble and service parts repeatedly without damaging the base material. Choose from helical wire inserts for compact strength, solid/key-locking inserts for maximum pull-out resistance, and blind rivet nuts for single-side installation in thin sheet.
Why Use Threaded Inserts in Metal?
- Repair & reinforcement: Restore stripped threads and extend component life.
- Higher load capacity: Spread stress to reduce strip-out and thread wear.
- Serviceability: Allow repeated assembly/disassembly without harming the parent metal.
- Thin-wall solutions: Add strong threads to sheet and tubing where tapping isn’t practical.
- Tough environments: Locking and stainless styles hold up to vibration and corrosion.
Common Applications
- Automotive & aerospace: Engine blocks, castings, brackets, and serviceable components.
- Industrial equipment: Frames, tooling plates, machine covers, and control panels.
- Electronics & enclosures: Reliable fastening in thin stainless or aluminum housings.
- Metal fabrication & repair: Retrofitting, thread rebuilds, and upgrades to soft alloys.
Types & Materials
- Helical wire inserts: Compact, high-strength threads for aluminum, magnesium, and steels.
- Solid / key-locking inserts: Positive mechanical keying for maximum pull-out and anti-rotation in soft metals.
- Blind rivet nuts: Install from one side to add reusable threads in sheet metal; select the right grip range.
- Materials: Stainless steel (most common), carbon steel, or plated options for environment and cost.
Quick Selection Tips
- Choose helical wire for compact repairs and high cyclic wear.
- Choose key-locking where you need the highest pull-out resistance or anti-rotation in soft metals.
- Choose rivet nuts for sheet and tube where you only have access from one side.
- Match drill/tap sizes to the insert spec; confirm hole tolerance and countersink if required.
FAQs: Thread Inserts for Metal
What are threaded inserts for metal and when should I use them?
Components that create or restore internal threads so fasteners can be installed reliably. Use them to repair stripped holes, add strong threads to thin sections, raise strip-out strength, or enable frequent service.
Which type works best in sheet metal versus thick sections?
In sheet metal, use blind rivet nuts (install from one side and clamp thin material). In thicker sections, use helical wire or solid/key-locking inserts for the greatest strength and wear resistance.
How strong are helical wire inserts compared to a tapped hole?
Properly installed wire inserts typically meet or exceed original thread strength by distributing load and resisting wear and galling—especially valuable in soft alloys like aluminum and magnesium.
When should I pick a key-locking (solid) insert instead of a wire insert?
When you need the highest pull-out resistance, positive anti-rotation in soft metals, or the joint will see heavy vibration and frequent service. They require more steps but deliver the most robust repair.
Are rivet nuts as strong as inserts in thick metal?
Rivet nuts provide reusable threads in thin sheet, but their ultimate strength is generally lower than solid/key-locking inserts in thick sections. Selecting the correct head style and grip range maximizes performance.
What drill and tap sizes do I need?
Follow the insert’s technical chart exactly. Wire and solid inserts specify a pilot drill and tap size (and sometimes a countersink); rivet nuts specify a hole diameter and grip range. Correct sizes ensure fit and strength.
What tools are required for installation?
- Helical wire: drill → (c’sink if required) → tap → insert with driver → break tang.
- Key-locking: drill → c’sink → tap → install insert → drive keys to lock.
- Rivet nuts: drill → set with a manual/ratcheting/pneumatic rivet-nut tool.
How do I prevent pull-out or insert spin?
Use the correct hole size and tap class, observe installation torque, and choose knurled, keyed, or hex-body styles where rotation is a risk. For rivet nuts, verify the grip range matches total material thickness.
Are threaded inserts removable?
Wire inserts can be extracted with the proper tool; key-locking inserts can be serviced by lifting the keys; rivet nuts can be drilled out and replaced. Follow the service procedure for your insert style.
Order High-Quality Threaded Inserts for Metal
Get reliable, long-lasting threads with our selection of helical wire, solid/key-locking, and blind rivet nuts. Browse sizes and materials, and request a quote for volume pricing.