Description
KEEP-NUT™ Press-In Self-Anchoring Inserts (M6 Metric 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, elastic crowns, and a plastic retention ring. This compact design delivers extreme pull-out strength in materials like granite, marble, quartz, solid surface, HPL, glass, and fiber cement—all without the need for messy resins or adhesives.
M6 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/M6/H5 | M6 | 8.0 mm (.31″) | 4.5 mm (.18″) | 12 mm | 5.5 mm (.22″) | 1 | 0.2 (44.96) | 0.9 (202.33) |
| IM2S/M6/H6 | M6 | 8.5 mm (.34″) | 5.5 mm (.22″) | 12 mm | 6.5 mm (.26″) | 2 | 0.4 (89.92) | 2.5 (562.02) |
| IM4S/M6/H8.5 | M6 | 11.0 mm (.43″) | 7.5 mm (.30″) | 12 mm | 9.0 mm (.36″) | 4 | 1.0 (224.81) | 3.5 (786.83) |
| IM4S/M6/H15 | M6 | 17.5 mm (.69″) | 14.0 mm (.55″) | 12 mm | 15.5 mm (.61″) | 4 | 1.0 (224.81) | 4.2 (944.20) |
Compatible Substrates
KEEP-NUT™ is engineered to safely mechanically anchor into extremely hard, brittle, and thin materials without cracking the parent substrate.
Installation & Workflow Videos
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.
| Material | 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 varies by brand and panel density. Safety factors should be applied per project requirements.
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