Description
KEEP-NUT™ Press-In Self-Anchoring Inserts (10-24 Thread)
KEEP-NUT™ by Specialinsert® is a revolutionary press-in anchor insert designed for permanent, high-strength fastening in exceptionally thin and hard surfaces. It is the industry standard for undermount sink installations, ventilated facades, architectural cladding, and modern furniture assembly.
Manufactured from durable stainless steel, the insert features a threaded bushing, a set of elastic crowns, and a plastic retention ring. This compact design delivers extreme pull-out strength without the need for messy resins, epoxies, or complex curing times.
10-24 Series Specifications
| Type/Thread/Height | Thread | Surface Min. Thickness | H1 Thread Depth | D2 Hole Dia (±0.2) | L2 Hole Depth (+1.0) | Crowns | Install Force kN (lbf) | Pull-Out Force kN (lbf) |
|---|---|---|---|---|---|---|---|---|
| IM1S/P10-24/H5 | 10-24 | 8.0 mm (.31″) | 4.5 mm (.18″) | 12 mm | 5.5 mm (.22″) | 1 | 0.2 (44.96) | 0.9 (202.33) |
| IM2S/P10-24/H6 | 10-24 | 8.5 mm (.34″) | 5.5 mm (.22″) | 12 mm | 6.5 mm (.26″) | 2 | 0.4 (89.92) | 2.5 (562.02) |
| IM4S/P10-24/H8.5 | 10-24 | 11.0 mm (.43″) | 7.5 mm (.30″) | 12 mm | 9.0 mm (.36″) | 4 | 1.0 (224.81) | 3.5 (786.83) |
Approved Materials & Installation
Performance by Material (Design Guidance)
P/S = Pull (tensile) / Shear load per anchor. Values shown are general design guidance based on ASTM C1354 testing and internal performance data. Always apply safety factors and confirm through project-specific testing when required.
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| Material | Typical Density | IM1S 5.5 mm P / S (lbf) |
IM2S 6.5 mm P / S (lbf) |
IM4S 8.5 mm P / S (lbf) |
IM4S 15.5 mm P / S (lbf) |
|---|---|---|---|---|---|
| Granite / Marble | High | 265 / 900 | 585 / 1,950 | 821 / 2,231 | 1,261 / 2,853 |
| Engineered Quartz | Med–High | 250 / 1,000 | 500 / 1,900 | 800 / 2,300 | 1,400 / 2,750 |
| Sintered Stone | Very High | 185 / 850 | 410 / 1,738 | 742 / 2,459 | 1,531 / 2,626 |
| Porcelain | Very High | 210 / 900 | 466 / 1,021 | 750 / 2,450 | 1,200 / 2,800 |
| HPL | Low | 247 / 600 | 427 / 1,021 | 951 / 1,344 | 1,500 / 1,650 |
| Solid Surface | Low–Med | 225 / 675 | 468 / 1,550 | 839 / 1,650 | 1,300 / 2,050 |
| UHPC | High | 210 / 900 | 275 / 1,350 | 441 / 1,565 | 603 / 1,592 |
Actual performance can vary by surface brand, density, panel thickness, and installation quality. Treat values as generalized guidance only.
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