5/16-18 UNC SWAGING RIVETNUT, KNURLED BODY, BLIND HOLE/LARGE GRIP, STEEL, YELLOW ZINC PLATED

The ATN031C1SY is a 5/16-18 steel, yellow zinc plated swaging-series rivet nut (RivetKing ISR series, straight knurl) designed for blind-hole installations and applications where the panel grip range is unknown or variable. Unlike standard fixed-grip rivet nuts, the ISR series has unlimited maximum grip — it will set in any sheet thicker than 0.030" — making it the right choice when you don't know the exact panel thickness in advance.

When to choose ISR over standard IKF: The ISR swaging design swages outward against the inside of a blind hole rather than collapsing against the back face of an open panel, making it suitable for closed/blind cavities and one-sided structural panels. Common applications: Heavy use in automotive accessories, off-road vehicle modifications, equipment manufacturing, panel mounting, and general industrial fabrication where moderate load capacity is needed. In steel, yellow zinc plated this part is well-suited to general industrial, automotive, structural.

Understanding Grip Range

Specifications

Related Parts in This Family

Match your panel thickness to a grip range below, or switch material for your environment. The highlighted row is the part you're viewing now.

Installation: Drill a hole within the recommended range (0.5" depending on sheet thickness — see the spec table above). Set with a swaging-compatible rivet nut tool. The ISR body swages radially outward and the knurled body locks against the hole wall to prevent rotation.

For step-by-step instructions: see our How to Install Rivet Nuts guide for the complete process, common mistakes, and verification tips.

Tool selection: Use a pneumatic or hydraulic rivet nut tool for production volume. A battery-powered cordless tool also works well at this size. Hand tools are workable for occasional installs but become fatiguing in volume. Note: ISR swaging-style rivet nuts may require slightly different tool nose pieces than standard IKF — confirm tool compatibility before ordering at scale.

Drill bit needed: 0.5000" (1/2"). We stock the matching Triumph bit — TRI14532 — ships same day with your rivet nuts. Full drill bit chart.

Technical Notes

Performance values per RivetKing Rev. B test data (May 2023), tested in zinc-plated steel installed in flat sheet stock under laboratory conditions. Actual performance in your application varies with panel material, hole tolerance, installation, and environmental factors. Reference only — not for use as design loads without independent validation. See full performance reference and disclaimer.

Manufacturer Cross-References

The ISR / ATN series is also called “swaging rivet nut,” “blind hole rivet nut,” or “large grip range nutsert” depending on manufacturer. All refer to the same product family — call us with any cross-reference for a same-day match.

Rivet Nut vs. Other Threaded Inserts

See the full comparison guide for detailed pros, cons, load tables, and decision criteria.

Helpful resources: Selection Guide · Drill Bit & Hole Size Chart · Tool Selection Guide · How to Install · Rivnut vs. Plus / Jack / Well / PEM Comparison.

In stock at Eugene Fastener & Supply. Shipping nationwide. Same-day shipping on orders placed before 2pm Pacific.