100 Pack of Keep-Nut Inserts

SKU: CCH-KN-2S-1/4-100PK


646 in stock

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View the NEW Keep-Nut NSI Report

Recommended by Wilsonart for sink installation undermounts.

KEEP-NUT™ Press-in Self-anchoring Inserts, 10-24 Thread
Keep-Nut Versions


Surface Min.
H1 Thread
Hole Diameter ⌀
L2 Hole 
No. of
kN (lbf)
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)
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. 

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™ 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.


  • 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 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
Fiber Cement (high density) 12mm IM4S/P1-4.20/H8.5 606
Fiber Cement (high density) 10mm IM4S/P1-4.20/H8.5 527
Fiber Cement (high density) 8mm IM2S/P1-4.20/H6 277
HPL 12mm IM4S/P1-4.20/H8.5 1194
HPL 10mm IM4S/P1-4.20/H8.5 1348
HPL 8mm IM2S/P1-4.20/H6 596
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
Keep-Nut Installation

Recommended by Wilsonart for sink installation undermounts.

U.S. Patent No. 10,473,141 (the ‘141 Patent)

Additional information

Weight 2 lbs
Dimensions 4 × 0.25 × 6 in

Must Ship Freight

Country Of Manufacture



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