SpecialInsert

KEEP-NUT™ By Special Insert – 1/4-20 Thread

SKU: CCH-KEEPNUT-1/4-20

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Description

 

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)
 

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™ 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

How to insert a Keep-Nut: Drill, Verify, and Insert.
 
 

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

Additional information

Weight 0.006 lbs
Dimensions 0.5 × 0.5 × 0.25 in
Manufacturer

Thread Size

Keep Nut Allen Post

Must Ship Freight

Origin

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