Knurled Round Body Rivet Nuts (Thin-Wall / Low-Profile)
Knurled round body rivet nuts add circumferential bite to the plain round hole — the collected manufacturer line names them ideal for softer materials like aluminum and composites. Known in distributor catalogs as the "Thin Wall" or "Low Profile" series; wedge-design knurled bodies publish tested spin-out figures (18.52 N·m for an M6 in 3 mm aluminum on the collected wedge line).
Last updated: 2026-11
Specifications
A knurled round body rivet nut is the upgrade path from the smooth baseline that keeps the plain round hole: circumferential knurls on the body wall bite into the hole as the body collapses, converting torque into mechanical interlock instead of relying on radial bulge alone. The collected manufacturer line assigns this body to softer parent materials — ideal for softer materials like aluminum and composites — where a smooth body's grip is least reliable and a hex hole is hardest to make cleanly. Distributor catalogs sell the form under two names worth knowing when cross-referencing: the "Thin Wall" or "Low Profile" series, with knurled round and half-hex variants on thin or near-flush heads. The measurable end of this family is the wedge-design knurled body: an engineered knurl combined with an underhead wedge, published with tested spin-out figures — an M6 insert in 3 mm aluminum tested at 18.52 N·m against 12.8 N·m for similar wedged round bodies, a 44% improvement. That number is also a reminder of the selection discipline: spin-out is a tested joint property — material, sheet, hole and setting force all move it — so rate a torque-critical joint from published test conditions or your own test, not from the body name alone.
| Type | Knurled round body rivet nut — circumferential knurl bites the plain round hole against spin-out |
|---|---|
| Material positioning | Manufacturer line: "Ideal for softer materials like aluminum and composites" — knurl bite where smooth-body grip is weakest |
| Full-metric series availability | CKLM (round knurled, large flange) · CKKM (round knurled, small flange) |
| Catalog naming | Distributor listings: "Thin Wall" or "Low Profile" series — knurled round body with thin or near-flush head; half-hex variants exist in the same series |
| Wedge-design test figure | M6 wedge-design knurled body in 3 mm thick aluminum: spin-out tested at 18.52 N·m vs 12.8 N·m for similar wedged round bodies — a 44% improvement (manufacturer-published test, named conditions) |
| Wedge design | Proprietary combination of an engineered knurled body and underhead wedge design; spin-out performance approaching hex-body levels while keeping the round hole |
| Stainless availability | Wedge-design line available in stainless steel for added corrosion resistance |
| Torque selection caveat | Spin-out torque depends on rivet nut material, thread size, body shape, sheet material and thickness, hole diameter, grip range, setting force and surface treatment — no single value applies across sizes |
| MOQ / lead time | 10,000–50,000 pieces by size; 10–20 days |
| Thread | Body diameter max (mm) | Head diameter (mm) | Hole in sheet (mm) | Grip range options (mm) | Min sheet (mm) |
|---|---|---|---|---|---|
| M3x0.5 | 4.98 | 7 | 5 | 0.5-2.0 / 2.0-3.5 | 0.5 |
| M4x0.7 | 5.98 | 9 | 6 | 0.5-2.5 / 2.5-4.5 | 0.5 |
| M5x0.8 | 6.98 | 10 | 7 | 0.5-3.0 / 3.0-5.5 / 5.5-8.0 | 0.5 |
| M6x1 | 8.98 | 13 | 9 | 0.5-3.0 / 3.0-5.5 / 5.5-8.0 | 0.5 |
| M8x1.25 | 10.98 | 16 | 11 | 0.5-3.0 / 3.0-5.5 / 5.5-8.0 | 0.5 |
| M10x1.5 | 12.98 | 19 | 13 | 0.7-3.5 / 3.5-6.0 / 6.0-9.0 | 0.7 |
| M12x1.75 | 15.98 | 23 | 16 | 1.5-4.5 / 4.5-7.5 | 1.5 |
Materials
- Steel
- Stainless steel
- Aluminum
Ordering & documentation
Documents
Shipments are backed by Mill Test Certificate (MTC), Dimensional Report, Salt Spray Test Report on request, with full batch traceability from raw material to finished product. Quality management follows the owner-confirmed compliance list: ISO 9001:2015, RoHS, REACH. Exact document sets are confirmed on the order.
Quotation
- The fastener family (Knurled Round Body Rivet Nuts (Thin-Wall / Low-Profile)) plus the standard designation from your drawing — DIN / ISO / JIS / ASTM / ANSI, or a drawing for custom parts.
- Size (diameter and length), thread type (metric or inch), property class or grade, and coating or finish.
- Quantity per size and your target delivery date.
- Destination country, and any required documents (for example a mill test certificate) so the quote includes them.
Sample & supply
Minimum order quantity is 10,000–50,000 pieces depending on size. Standard production run 10–20 days. Quantities or variants outside the standard range are confirmed at quotation.
Storage & shipping
Parts are packed for export and shipped factory-direct to buyers in Europe, Asia, the Americas and the Middle East. Store fasteners dry and protected until installation, and keep coated parts in their packaging until use; specific packing and preservation requirements can be stated on the order and confirmed at quotation.
Frequently asked questions
What does the knurl actually buy over a smooth round body?
Torque resistance in the same plain round hole. A smooth body grips by radial bulge only — the light-duty case the manufacturer line assigns it; the knurl adds circumferential teeth that interlock with the hole wall as the body sets. That is why the knurled body is the manufacturer's designated choice for softer parents like aluminum and composites: in soft sheet a smooth body has little to grip, while the knurl displaces and keys into the wall. Performed at its best — the engineered-knurl plus underhead-wedge design — the approach publishes tested spin-out near hex-body territory while keeping round-hole preparation.
Can I trust a published spin-out figure like 18.52 N·m for my joint?
Only under its own conditions. The figure is a manufacturer test of an M6 insert set in 3 mm aluminum against a named comparator — useful for ranking body designs, not as a joint allowable. The collected industry guidance is explicit that no single torque value applies: spin-out moves with insert material, thread size, body shape, sheet material and thickness, hole diameter, grip range, setting force and surface treatment. Use published figures to choose the body family, then verify your actual material/hole/tool combination — especially near the torque limit where a spun insert means scrapping the panel.
What is the MOQ and lead time for these rivets?
Minimum order quantity is 10,000–50,000 pieces depending on size and material. Standard production lead time is 10–20 days. Common blind rivet sizes are widely stocked — confirm the exact schedule against quantity and size mix at quotation.
What should an RFQ for these rivets state?
State the rivet subtype (open-end, closed-end, structural blind rivet or rivet nut), body diameter, grip range or total material thickness, head style (dome, countersunk or large flange), body and mandrel materials (for example aluminum body with steel mandrel, or all-stainless), finish, required certificates such as a mill test report per EN 10204 3.1, and quantity per size — plus destination country.
Request a Quote
Get factory-direct pricing from the manufacturer.
What to include in your inquiry
- ✓ Standard and property class (e.g. DIN 912, ISO 4762, class 8.8) — or a drawing for custom parts.
- ✓ Sizes, lengths and thread type (metric or inch).
- ✓ Quantity per size and your target delivery date.
- ✓ Destination country, plus any coating or finish requirement.
- ✓ Any documents you need with the shipment (e.g. mill test certificate) so the quote includes them.
- ✓ Your inquiry goes straight to the factory team by email and gets a reply within 24 hours.
- ✓ Factory-direct pricing
- ✓ Standard and custom specifications
- ✓ Factory-direct export to buyers in Europe, Asia, the Americas and the Middle East
- ✓ Full fastener family support