Buy Captive Nuts Online in Australia
Captive Nut Types — Quick Reference
Captive nuts install a fixed or floating threaded insert into sheet metal, panels or structural sections — providing a threaded fastening point where through-nut access is not available, or where nut retention during assembly is critical. Selection turns on the parent material + access + installation method.
| Captive Nut Type | Installation | Best For |
|---|---|---|
| Weld Nuts (Hex / Square) | Resistance-welded to sheet metal | Production sheet metal assembly — vehicle chassis, brackets, panels |
| Rivet Nuts / Nutserts | Pull-up installation with rivet nut tool | Hollow tube + sheet metal where rear-side access is unavailable |
| Cage Nuts | Snap into square hole — captive, removable | Server racks, equipment cabinets, demountable assemblies |
| Floating Panel Nuts | Riveted to panel with float allowance | Sheet metal panels with manufacturing tolerance variance |
| Clinch Nuts (Self-Clinch / PEM) | Press-fit into pre-punched hole | Production sheet metal — high-volume permanent installation |
| Tab Nuts / Clip Nuts | Spring-clip onto panel edge / slot | Sheet metal panel fasteners — automotive, white goods, control panels |
| Insert Nuts (Wood) | Hammer-in or screw-in to drilled hole | Threaded fastening points in MDF, hardwood, plywood |
Common sizes: M3, M4, M5, M6, M8, M10 (rivet nuts to M12). Match the captive nut's grip range to the parent material thickness. Rivet nuts come in different head profiles (flat, large flange, countersunk) for surface finish requirements. Companion ranges: rivets, sheet metal fasteners, hex bolts & nuts.
Captive Nuts — Weld Nuts, Cage Nuts & Rivet Nuts
Captive nuts install a fixed or floating threaded insert into sheet metal, panels, and structural sections — providing a threaded fastening point where through-nut access is not available or where nut retention during assembly is required. AIMS Industrial sells captive nuts including weld nuts, rivet nuts (nutserts), cage nuts, and floating panel nuts for sheet metal fabrication, rack mounting, and enclosure assembly.
Captive Nut Types We Stock
- Weld Nuts (Spot Weld Nuts): Weld nuts are resistance-spot-welded to the back of sheet metal panels — providing a strong, fixed threaded boss without nut access from the rear. Available in M4 to M12 metric and hexagonal base configurations. Used in automotive, sheet metal enclosures, and structural fabrication.
- Rivet Nuts (Nutserts): Rivet nuts install a threaded insert into a pre-drilled hole from one side only — the body collapses behind the sheet as the mandrel is drawn, clamping the nut in position.
- Cage Nuts: Cage nuts clip into square holes in rack-mount framing and server enclosures — the captive cage holds the nut in position for one-handed bolt insertion. Industry standard for 19" rack mounting in server rooms, switchboards, and data centre infrastructure.
- Spring Cage Floating Nuts: Floating cage nuts allow minor positional adjustment — the nut floats within the cage, accommodating hole misalignment between mating panels and components. Important in high-volume assembly where panel hole alignment variation is expected.
Captive Nut Selection Guide
- Installation Method: Weld nuts require resistance welding equipment. Rivet nuts require a rivet nut tool (threaded mandrel puller). Cage nuts clip in without tools. Select the captive nut type based on available installation equipment and production process.
- Sheet Thickness Range: Rivet nuts and weld nuts have a specified sheet thickness range — the clamping or weld must be effective within the material gauge being used. Confirm the sheet thickness is within the nut's specified grip range before selection.
- Material Compatibility: Use aluminium rivet nuts in aluminium sheet to prevent galvanic corrosion. Steel rivet nuts and weld nuts in mild steel. Stainless steel captive nut variants are available for corrosive environments.
Australian Business, Local Supply: As a proudly Australian business since 1988, we stock locally and work with trusted local Australian manufacturers and distributors to ensure fast, reliable supply.
Expert Support: Need help buying the right product for your application? Contact our team for application-specific advice or request a quote.
See our full fasteners range including hex nuts, flanged nuts, lock washers, Nuts and Bolts.
People Also Ask — Captive Nuts
Q: What is a captive nut?
A captive nut is a fixed or floating threaded insert installed into sheet metal, a panel, or a structural section, giving a threaded fastening point where you can't reach the back for a normal nut, or where the nut has to stay put during assembly. Common types are weld nuts, rivet nuts (nutserts), cage nuts, and clinch nuts.
Q: What's the difference between a weld nut, a rivet nut and a cage nut?
A weld nut is resistance-welded to the back of a panel and needs welding gear. A rivet nut (nutsert) pulls up into a pre-drilled hole from one side with a rivet-nut tool — no welding and no rear access needed. A cage nut clips into a square hole and is removable, which is why it's the standard for equipment racks. Choose by access, available equipment, and whether it must be removable.
Q: Do I need rear access to fit a captive nut?
Not for rivet nuts or cage nuts — both install from the front or one side, which is their main advantage. Weld nuts do need rear access for the welder. If you have no rear access and no welding equipment, a rivet nut is usually the answer for putting a thread into sheet metal or tube.
Q: How do I choose a rivet nut for my material thickness?
Match the rivet nut's grip range to the panel gauge — too thin and it won't clamp, too thick and it won't set. Then pick the head profile (flat, large flange, or countersunk) for the surface finish you need, and match the nut material to the panel (aluminium nut in aluminium, steel in steel) to avoid galvanic corrosion.
Q: What tool installs a rivet nut?
A rivet-nut (nutsert) tool with a threaded mandrel: thread the nut onto the mandrel, place it in the hole, then squeeze or pull to collapse the body behind the panel, and unwind the mandrel to release. Hand, lever, and pneumatic tools are available — match the tool to your installation volume.
Q: What sizes and styles of captive nut are available?
Common metric sizes run M3 to M10, with rivet nuts up to M12, across weld, rivet, cage, floating-cage, clinch, and clip-nut styles. Match the thread size to the bolt you'll use and the grip range to the parent material thickness, then choose the style by your installation method and whether it needs to be removable.