Tap-Flex® Thread-Forming, Self-Tapping Structural Screws

Tap-Flex® Thread-Forming Structural Screws are high-performance, dual heat-treated self-tapping fasteners engineered for demanding structural applications, including curtain walls and dissimilar metal assemblies, where strength, ductility, and resistance to embrittlement are essential. These thread-forming screws eliminate the need for traditional nut-and-bolt systems by offering a robust alternative that simplifies installation—especially in blind connection scenarios where rear access is limited or unavailable.

Tap-Flex fasteners feature a patented E-Form® segmented thread profile, specifically designed to enhance installation performance. This unique thread geometry enables efficient thread formation while maximizing thread engagement within the base material, resulting in a secure, high-strength connection.

Increase Thread Engagement with Strength & Ductility Using Tap-Flex Structural Fasteners

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SKU	Product Type	Diameter	Length	Head Type	Drive Type	Point Type	Material	Finish	Pieces Per Unit	Price
DEW DFSESU330	Thread-Forming Structural Screw	3/8"	2-1/2"	Hex Washer w/ Serrations	Hex	E-Form	Alloy Steel	Stalgard® Silver SUB	400/Box	$359.60
DEW DFSESU330-50	Thread-Forming Structural Screw	3/8"	2-1/2"	Hex Washer w/ Serrations	Hex	E-Form	Alloy Steel	Stalgard® Silver SUB	50/Box	$40.90
DEW DFSESU430-50	Thread-Forming Structural Screw	1/2"	2-1/2"	Hex Washer w/ Serrations	Hex	E-Form	Alloy Steel	Stalgard® Silver SUB	50/Box	$153.09
DEW DFSESU360-50	Thread-Forming Structural Screw	3/8"	5"	Hex Washer w/ Serrations	Hex	E-Form	Alloy Steel	Stalgard® Silver SUB	50/Box	$68.30
DEW DFSESU310-100	Thread-Forming Structural Screw	3/8"	1-1/2"	Hex Washer w/ Serrations	Hex	E-Form	Alloy Steel	Stalgard® Silver SUB	100/Box	$65.02
DEW DFSESU410-50	Thread-Forming Structural Screw	1/2"	1-1/2"	Hex Washer w/ Serrations	Hex	E-Form	Alloy Steel	Stalgard® Silver SUB	50/Box	$170.00
DEW DFSESU530-25	Thread-Forming Structural Screw	5/8"	2-1/2"	Hex Washer w/ Serrations	Hex	E-Form	Alloy Steel	Stalgard® Silver SUB	25/Box	$108.57
DEW DFSESU510	Thread-Forming Structural Screw	5/8"	1-1/2"	Hex Washer w/ Serrations	Hex	E-Form	Alloy Steel	Stalgard® Silver SUB	200/Box	$688.80
DEW DFSESU510-25	Thread-Forming Structural Screw	5/8"	1-1/2"	Hex Washer w/ Serrations	Hex	E-Form	Alloy Steel	Stalgard® Silver SUB	25/Box	$82.15
DEW DFSESU540-25	Thread-Forming Structural Screw	5/8"	3"	Hex Washer w/ Serrations	Hex	E-Form	Alloy Steel	Stalgard® Silver SUB	25/Box	$124.99
DEW DFSESU520	Thread-Forming Structural Screw	5/8"	2"	Hex Washer w/ Serrations	Hex	E-Form	Alloy Steel	Stalgard® Silver SUB	150/Box	$598.50
DEW DFSESU520-25	Thread-Forming Structural Screw	5/8"	2"	Hex Washer w/ Serrations	Hex	E-Form	Alloy Steel	Stalgard® Silver SUB	25/Box	$95.56
DEW DFSESU530	Thread-Forming Structural Screw	5/8"	2-1/2"	Hex Washer w/ Serrations	Hex	E-Form	Alloy Steel	Stalgard® Silver SUB	150/Box	$679.95
DEW DFSESU540	Thread-Forming Structural Screw	5/8"	3"	Hex Washer w/ Serrations	Hex	E-Form	Alloy Steel	Stalgard® Silver SUB	100/Box	$521.80
DEW DFSESU550	Thread-Forming Structural Screw	5/8"	4"	Hex Washer w/ Serrations	Hex	E-Form	Alloy Steel	Stalgard® Silver SUB	100/Box	$612.00

Displaying 15 of 22 Products

Features and Benefits:

Eliminates thread-tapping operations
E-Form configuration overcomes friction build-up and reduces drive torque
Roll forms own work-hardened thread to resist loosening caused by vibration or thermal changes
Provides enhanced pull-out performance
Well-suited for metal applications such as steel and aluminum
Flex Technology heat treat provides required strength and ductility
Virtually immune to delayed embrittlement failures
Stalgard SUB coating provides 2000 hours of salt spray resistance (per ASTM B117)
Accept standard nuts and washers if required

Tap-Flex Applications:

Steel-to-Steel Connections
Aluminum-to-Steel Connections
Aluminum-to-Aluminum
Steel-to-aluminum Connections

Exclusive Flex Technology^® Process

Tap-Flex fasteners undergo the unique Flex Technology dual hardening process.

The lead tapping threads are selectively hardened to a minimum of HRC 52, easing installation. The load-bearing portion of the fastener is held at or below the critical HRC 34 level. This reduced hardness level also meets Grade 5 ASTM A449 strength and ductility standards. This helps prevent embrittlement and other structural failures, providing high performance over a long life in the field.

Diameters: 3/8", 1/2", and 5/8"

Lengths: 1-1/2" – 5"

Head Style: Hex washer with Underheard Serrations

Threads: E-Form Five-Lobe Thread Forming

Material: Alloy Steel

Finishes: Silver Stalgard® SUB Coating

Grade 5: Meets ASTM A449 Specifications (120 ksi strength)

Tap-Flex screws are thread formers with the patent-pending E-Form® segmented thread profile. This design improves both installation and in-place performance:

Decreases thread-forming torque, easing starting and placement
Overcomes friction build-up and reduces drive torque
Increases thread engagement, so it resists back-out and loosening caused by vibration or thermal changes

<div itemscope itemtype="https://schema.org/FAQPage"> <div itemscope itemprop="mainEntity" itemtype="https://schema.org/Question"> <h2>INSTALLATION GUIDELINES</h2> <p itemprop="name" style="font-size:16px">How to Install Tap-Flex thread-forming Structural Screws</p> <div itemscope itemprop="acceptedAnswer" itemtype="https://schema.org/Answer"> <div itemprop="text"> <table width="100%" cellpadding="10" cellspacing="0"> <tbody> <tr> <td width="25%" align="center" valign="top"><img src="https://www.tannerbolt.com/media/wysiwyg/tanimg/spec-pages/Tap-flex-self-tapping-screw-install-1.png" alt="Tap Flex Install Instructions 1"></td> <td width="25%" align="center" valign="top"><img src="https://www.tannerbolt.com/media/wysiwyg/tanimg/spec-pages/Tap-flex-self-tapping-screw-install-2.png" alt="Tap Flex Install Instructions 2"></td> <td width="25%" align="center" valign="top"><img src="https://www.tannerbolt.com/media/wysiwyg/tanimg/spec-pages/Tap-flex-self-tapping-screw-install-3.png" alt="Tap Flex Install Instructions 3"></td> <td width="25%" align="center" valign="top"><img src="https://www.tannerbolt.com/media/wysiwyg/tanimg/spec-pages/Tap-flex-self-tapping-screw-install-4.png" alt="Tap Flex Install Instructions 4"></td> </tr> <tr> <td width="25%" style="text-align: left; vertical-align: top; line-height: 14px;font-size: 13px;">Step 1 Using the proper drill bit or annular cutter size, drill a hole into the base material. Remove any chips or burrs from the hole.</td> <td width="25%" style="text-align: left; vertical-align: top; line-height: 14px;font-size: 13px;">Step 2 Select a powered impact wrench and attach an appropriate sized hex socket/driver to the impact wrench. Mount the screw fastener head into the socket.</td> <td width="25%" style="text-align: left; vertical-align: top; line-height: 14px;font-size: 13px;">Step 3 Drive the anchor into the hole until the head of the anchor comes into contact with the fixture or the material being fastened. The fastener must be snug after installation.</td> <td width="25%" style="text-align: left; vertical-align: top; line-height: 14px;font-size: 13px;">Step 4 (Optional) Tighten the fastener with a torque wrench to an appropriate seating torque.Do not exceed the maximum torque for the selected anchor diameter.<br> Note: An appropriate seating torque ranges from snug tight at a minimum to a maximum of the listed maximum seating torque or 75% of the stipping torque in the material.</td> </tr> </tbody> </table> </div> </div> </div> </div> </div>