Concrete Screws, Tamper-Resistant

6-Lobe Tamper-Resistant Concrete Screw Anchors are the optimal fastening solution for use in concrete, brick, or hollow block. This unique screw combines the security feature of a 6-lobe tamper-resistant drive with the superior quality and easy installation of a masonry screw. The special Hi-Lo thread literally taps threads into concrete & masonry materials. The high, sharp thread with its notched cutting edge cuts deeply and easily. The alternating low thread provides stability for fast, accurate driving. The screws are coated with a Tanner Guard finish to provide superior corrosion resistance.

6-Lobe Tamper-Resistant Concrete Screw Anchors

Combines the security feature of a 6-lobe tamper-resistant drive with the superior quality and easy installation of a concrete screw
Special Hi-Lo thread literally taps threads into masonry materials
Deep & easy cutting with notched cutting edge & high, sharp thread
Stability with alternating low thread for fast, accurate driving
Tanner Guard finish providing superior corrosion resistance

Installation for Tamper-Resistant Screw Anchors in Masonry & Concrete

Fastener Length and Diameter
The length of the masonry fastener to be used is determined by combining the thickness of the attachment (A) with the desired depth of embedment in the masonry material (B). It is recommended that a minimum of 1" and a maximum of 1-3/4" embedment be used in determining fastener length. The diameter of the fastener and the depth of embedment affect pullout strengths. Application strength requirements and safety factors should be considered when determining the embedment depth and fastener diameter.

Hole Depth
The correct hole depth (B & C) can normally be obtained by drilling the full length of this bit. In all cases, the hole must be at least 1/4" deeper than the depth of the fastener embedment. Normal safety precautions should be observed when drilling the holes to avoid electrical installations, other utilities, and reinforcement bars.

Hole Diameter
The diameter of the drilled hole is also important to the performance of the masonry fastener. To provide the proper hole diameters, carbide-tipped drill bits are manufactured to closer standards than those called for in the American National Standard. Using carbide-tipped bits will help assure consistent performance and maximum pullout strength.

A = Attachment thickness

B = Screw embedment (min. of 1”, max. of 1-3/4”)

A+B = Screw length

B+C = Hole depth

(Must be at least 1/4” deeper than screw embedment)

Concrete And Masonry Screw Installation Diagram

SKU	Product Type	Diameter	Length	Head Type	Drive Type	Material	Finish	Pieces Per Unit	Price
25N125ABTZ	Tamper-Resistant Masonry Concrete Screw	1/4"	1-1/4"	Button	6-Lobe w/Pin	Case Hardened Steel	Tanner-Guard Corrosion Resistant Coating	100/Box	$37.25
25N125ABTZ/BULK	Tamper-Resistant Masonry Concrete Screw	1/4"	1-1/4"	Button	6-Lobe w/Pin	Case Hardened Steel	Tanner-Guard Corrosion Resistant Coating	3000/Box	$1080.00
25N175ABTZ	Tamper-Resistant Masonry Concrete Screw	1/4"	1-3/4"	Button	6-Lobe w/Pin	Case Hardened Steel	Tanner-Guard Corrosion Resistant Coating	100/Box	$65.00
25N175ABTZ/BULK	Tamper-Resistant Masonry Concrete Screw	1/4"	1-3/4"	Button	6-Lobe w/Pin	Case Hardened Steel	Tanner-Guard Corrosion Resistant Coating	2000/Box	$800.00
25N225ABTZ	Tamper-Resistant Masonry Concrete Screw	1/4"	2-1/4"	Button	6-Lobe w/Pin	Case Hardened Steel	Tanner-Guard Corrosion Resistant Coating	100/Box	$46.86
25N225ABTZ/BULK	Tamper-Resistant Masonry Concrete Screw	1/4"	2-1/4"	Button	6-Lobe w/Pin	Case Hardened Steel	Stalgard® Silver	1500/Box	$667.80
25N275ABTZ	Tamper-Resistant Masonry Concrete Screw	1/4"	2-3/4"	Button	6-Lobe w/Pin	Case Hardened Steel	Tanner-Guard Corrosion Resistant Coating	100/Box	$53.68
25N275ABTZ/BULK	Tamper-Resistant Masonry Concrete Screw	1/4"	2-3/4"	Button	6-Lobe w/Pin	Case Hardened Steel	Tanner-Guard Corrosion Resistant Coating	1000/Box	$510.00
25N125AFTZ	Tamper-Resistant Masonry Concrete Screw	1/4"	1-1/4"	Flat	6-Lobe w/Pin	Case Hardened Steel	Tanner-Guard Corrosion Resistant Coating	100/Box	$78.00
25N125AFTZ/BULK	Tamper-Resistant Masonry Concrete Screw	1/4"	1-1/4"	Flat	6-Lobe w/Pin	Case Hardened Steel	Tanner-Guard Corrosion Resistant Coating	2500/Box	$1700.00
25N175AFTZ	Tamper-Resistant Masonry Concrete Screw	1/4"	1-3/4"	Flat	6-Lobe w/Pin	Case Hardened Steel	Tanner-Guard Corrosion Resistant Coating	100/Box	$43.71
25N175AFTZ/BULK	Tamper-Resistant Masonry Concrete Screw	1/4"	1-3/4"	Flat	6-Lobe w/Pin	Case Hardened Steel	Tanner-Guard Corrosion Resistant Coating	2000/Box	$755.00
25N225AFTZ	Tamper-Resistant Masonry Concrete Screw	1/4"	2-1/4"	Flat	6-Lobe w/Pin	Case Hardened Steel	Tanner-Guard Corrosion Resistant Coating	100/Box	$53.89
25N225AFTZ/BULK	Tamper-Resistant Masonry Concrete Screw	1/4"	2-1/4"	Flat	6-Lobe w/Pin	Case Hardened Steel	Tanner-Guard Corrosion Resistant Coating	1500/Box	$768.00
25N275AFTZ	Tamper-Resistant Masonry Concrete Screw	1/4"	2-3/4"	Flat	6-Lobe w/Pin	Case Hardened Steel	Tanner-Guard Corrosion Resistant Coating	100/Box	$100.50

Displaying 15 of 16 Products

Specifications Button Head

Pre-drill Hole 3/16” Ansi bit

Specifications Flat Head

Pre-drill Hole 3/16” Ansi bit

Performance Data 1/4” Screw Diameter
Hollow Block 1,924psi

Note: Indicated pull-out and shear failure values were obtained in tests witnessed by independent test labs (see below). These figures are offered only as a guide and are not guaranteed in any way by Tanner Fasteners & Industrial Products. A safety factor of 4:1, or 25% of the ultimate pull-out value, is generally accepted as a safe working load; however, reference should always be made to applicable codes for the specific safe working ratio.

Concrete 2,730psi

<table class="tspecTable" cellspacing="0" width="100%"> <tbody> <tr> <td>Depth of Embedment</td> <td> Edge Dist. </td> <td> Pull-Out</td> <td>Shear</td> </tr> <tr> <td>1”</td> <td /> <td>668</td> <td>632</td> </tr> <tr> <td>1-3/8”</td> <td>1”</td> <td>1,166</td> <td>1,070</td> </tr> <tr> <td>1-3/4”</td> <td /> <td>1,857</td> <td>919</td> </tr> <tr> <td>1”</td> <td /> <td>809</td> <td>1,153</td> </tr> <tr> <td>1-3/8”</td> <td>2-1/2”</td> <td>1,507</td> <td>1,583</td> </tr> <tr> <td>1-3/4”</td> <td /> <td>1,908</td> <td>1,780</td> </tr> </tbody> </table>