Description
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Keep-Nut™ Press-In ahcnoring sink fasteners are the strongest and most efficient mounting system for attaching undermount sinks to granite, quartz, solid surface, porcelain, and a variety of other hard surfaces. Originally designed to support building facades, vertical wall panels, and furniture, the KEEP-NUT™ also offers exceptional performance for sink mounting. Works on granite, marble, engineered stone, UHPC, porcelain, solid surface, glass, and composites.
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Which Bit is Right for Me?
| Type of Bit | Drilling Method | Surfaces |
| 11.8 mm 5/8-11 Thread Grinder Bit | KEEP-NUT™ Drilling Machine | Natural/Engineered Stone |
| 11.8 mm 1/2 GA CNC Bit | CNC | Natural/Engineered Stone |
| 11..4 mm 5/8-11 Thread Grinder Bit | Manual (without KEEP-NUT™ Drilling Machine) | Natural/Engineered Stone |
| 11.8 mm Hand Drill / Drill Press Bit | Manual | Solid Surface/Plastics |
KEEP-NUT™ Insert Pull Out Strength
| Part | Minimum Surface Depth(s) | Thread (d1) | Hole Depth (l2) |
| IM25/P14-.20/H6 | 0.34″ 8.5mm | 1/4-20 | 0.26″ 6.5mm |
| Hole Diameter (d2) | Threaded Post Depth (h1) | Number of Crowns | Average Pull-Out Strength |
| 11.8mm | 0.22″ 5.5mm | 2 | 562 lbf 2.5 kN |
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| Material | KEEP-NUT™ Type | Average Pull-Out Load on a Single Insert (lbs) |
| Granite 20mm | IM4S/P1-4.20/H8.5 | 1080 |
| Marble 20mm | IM4S/P1-4.20/H8.5 | 849 |
| Travertine 20mm | IM4S/P1-4.20/H8.5 | 496 |
| Corian 12mm | IM4S/P1-4.20/H8.5 | 1068 |
| Corian 10mm | IM2S/P1-4.20/H6 | 650 |
| Engineered Stone 15mm | IM4S/P1-4.20/H8.5 | 672 |
- – (1) KEEP-NUT™ (1/4-20 Thread) press-in self-anchoring insert
- – (1) 1-1/4″ Allen Post (1/4-20 Thread)
- – (1) Wing Nut (1/4-20 Thread)
- – (1) Star Washer
- – (1) “Z”-Shaped Sink Clip
Manual Grinder/Polisher Bit Installation: With the use of our 5/8-11 thread 11.4mm Manual Grinder Bit with Stop Collar plot each hole and drill to the correct depth. Then use the Go/No-Go Depth Gauge to test the hole and our setting tool to insert the KEEP-NUT™. When you arrive to the job site, use the Allen post, star washer, wingnut and sink clip to support your sink.
Drill Bit Solid Surface Installation: With the use of our 11.8mm Drill Bit with Stop Collar plot each hole and drill to the correct depth. Then use the Go/No-Go depth gauge to test the hole and our setting tool to insert the KEEP-NUT™. When you arrive to the job site, use the Allen post, star washer, wingnut and sink clip to support your sink.
U.S. Patent No. 10,473,141 (the ‘141 Patent)
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