Description
Keep-Nut press-in self-anchoring inserts by Specialinsert is a revolutionary press-in anchor insert commonly used for a number of applications including undermount sink installation, ventilated facades, cladding, and furniture. These small inserts are designed to install into a wide range of surfaces including granite, marble, quartz, solid surface, HPL, glass, fiber cement, and other compact materials.
|
Type/Thread/Height |
D1 Thread |
Surface Min. Thickness** |
H1 Thread Depth |
D2 Hole Diameter ⌀ ±0.2 |
L2 Hole Depth +1.0 |
No. of Crowns |
Installation Force kN (lbf) |
Pull-Out Force kN (lbf) |
| IM1S/P1.4-20/H5 | 1/4-20 | 8.0 mm (.31″) | 4.5 mm (.18″) | 12 mm | 5.5 mm (.22″) | 1 | 0.2 (44.96) | 0.9 (202.33) |
| IM2S/P1.4-20/H6 | 1/4-20 | 8.5 mm (.34″) | 5.5 mm (.22″) | 12 mm | 6.5 mm (.26″) | 2 | 0.4 (89.92) | 2.5 (562.02) |
| IM4S/P1.4-20/H8.5 | 1/4-20 | 11.0 mm (.43″) | 7.5 mm (.30″) | 12 mm | 9.0 mm (.36″) | 4 | 1.0 (224.81) | 3.5 (786.83) |
| IM4S/P1.4-20/H15 | 1/4-20 | 17.5 mm (.69″) | 14.0 mm (.55″) | 12 mm | 15.5 mm (.61″) | 4 | 1.0 (224.81) | 4.2 (944.20) |
The solid surface insert’s small size also lends itself to be installed into extremely thin surfaces while also being extremely strong. In addition, the Keep-Nut™ press-in self-anchoring insert is manufactured in stainless steel and it’s made of a threaded bush with a set of elastic crowns and a plastic ring for holding the complete set of parts together.
Advantages:
- Simple hole preparation
- Quick installation
- No need for resins or adhesives
- Radial force is produced only while the insert is under tensile load. The crowns spread the load into the parent material, allowing large loads to be carried
- Thread stops before end of insert, avoiding extraction as a result of the use of an excessively long bolt
Testing Data:
| Material | Type of Keep-Nut | Average pull-out load on a single insert (Kgs.) | Average pull-out load on a single insert (Lbs.) |
|---|---|---|---|
| Granite 20mm | IM4S/M6/H8.5 | 490,0 | 1080.3 |
| Marble 20mm | IM4S/M6/H8.5 | 385,0 | 848.78 |
| Travertine 20mm | IM4S/M6/H8.5 | 225,0 | 496.1 |
| Porcelain Gres 10mm | IM4S/M6/H6 | 150,0 | 330.8 |
| Porcelain Gres 20mm | IM4S/M6/H8.5 | 350,0 | 771.8 |
| Lapitec 12mm | IM4S/M6/H6 | 170,0 | 374.9 |
| HPL 12mm | IM4S/M6/H6 | 541,5 | 1194.0 |
| HPL 8mm | IM4S/M6/H6 | 270,5 | 596.5 |
| Dekton 20mm | IM4S/M6/H6 | 210,0 | 463.1 |
| Corian 12mm | IM4S/M6/H8.5 | 484,5 | 1068.3 |
| Corian 10mm | IM4S/M6/H6 | 290,0 | 650.5 |
| Hi-mac LG12 mm | IM4S/M6/H6 | 240,0 | 529.2 |
| Agglomerate stone 15mm | IM4S/M6/H6 | 305,0 | 672.5 |
| Material | Type of Keep-nut | Mode | Test | Average pull-out load on a single insert kN | Average pull-out load on a single insert (Lbs) |
|---|---|---|---|---|---|
| Black Absolute Granite 30mm | IM4S/P1-4.2/H8.5 | Tensile | ASTM C1354 | 6.35 | 1,427 |
| Black Absolute Granite 30mm | IM4S/P1-4.20/H15 | Tensile | ASTM C1354 | 7.75 | 1,742 |
| Black Absolute Granite 30mm | IM4S/P1-4.2/H8.5 | Shear | ASTM C1354 | 12.64 | 2,841 |
| Black Absolute Granite 30mm | IM4S/P1-4.20/H15 | Shear | ASTM C1354 | 14.78 | 3,322 |
| Caledonia Granite 30mm | IM4S/P1-4.2/H8.5 | Tensile | ASTM C1354 | 2.75 | 617 |
| Caledonia Granite 30mm | IM4S/P1-4.20/H15 | Tensile | ASTM C1354 | 5.62 | 1263 |
| Caledonia Granite 30mm | IM4S/P1-4.2/H8.5 | Shear | ASTM C1354 | 9.26 | 2,081 |
| Caledonia Granite 30mm | IM4S/P1-4.20/H15 | Shear | ASTM C1354 | 13.55 | 3,046 |
| Delicatus Ice Granite 30mm | IM4S/P1-4.2/H8.5 | Tensile | ASTM C1354 | 1.86 | 418 |
| Delicatus Ice Granite 30mm | IM4S/P1-4.20/H15 | Tensile | ASTM C1354 | 3.46 | 778 |
| Delicatus Ice Granite 30mm | IM4S/P1-4.2/H8.5 | Shear | ASTM C1354 | 7.87 | 1,768 |
| Delicatus Ice Granite 30mm | IM4S/P1-4.20/H15 | Shear | ASTM C1354 | 9.74 | 2,188 |
| Sapienstone Porcelain 12mm | IM2S/P1-4.20/H6 | Tensile | ASTM C1354 | 2.73 | 614 |
| Sapienstone Porcelain 12mm | IM2S/P1-4.20/H6 | Shear | ASTM C1354 | 7.43 | 1,670 |
| UHCP 15mm | IM4S/P1-4.20/H8.5 | Tensile | ASTM C1354 | 1.96 | 440 |
| UHCP 15mm | IM4S/P1-4.20/H8.5 | Shear | ASTM C1354 | 6.96 | 1,565 |
| UHCP 19mm | IM4S/P1-4.20/H15 | Tensile | ASTM C1354 | 2.68 | 601 |
| UHCP 19mm | IM4S/P1-4.20/H15 | Shear | ASTM C1354 | 7.08 | 1,591 |
Installation
U.S. Patent No. 10,473,141 (the ‘141 Patent)
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