Kombi Hexagonal Head Long Threaded Self-Tapping Structural Wood Screw
  • Code Approval
  • ICC , ETA
  • Connection Type
  • Wood/Steel
  • Manufacturer
  • SWG

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Hex Head

Fully Threaded

Counter Thread Tip

Steel to Wood

Product Description

Product Description

The ASSY Kombi Long Threaded (LT) screw is an engineered structural wood screw specifically designed for high-performance steel-to-wood connections. It allows for a precise setting without the need for pre-drilling. This specific type of long threaded screw is manufactured with an aggressive counter thread self-tapping tip, biting into the wood, and assuring quick and easy installation.

Designers must pay special attention to the geometry requirements, as the ASSY Kombi Long Threaded must follow the requirements of the partially threaded screw. Offering Code-approved reliability, the ASSY Kombi LT screw has been awarded an  ICC-ESR approval in the United States.


Diameter1/2″ (12 mm)
Lengths3-1/8″ (80 mm) , 4-3/4” (120 mm) , 6-1/4” (160 mm)
  • ICC-ESR approved
  • Regular hex head
  • Can replaces lag bolts
  • Designed for high-performance steel-to-wood connections
  • Used with our MTS15 Tension Strap for CLT panel connections [opening reinforcement, wall strap, diaphragm strap]
  • Recommended for lifting in conjunction with the Transport Anchor and the Yoke systems
  • Installation with AW bits or metric Hex head socket
  • All ASSY fasteners can participate in LEED BD+C 2.0 certification [MRc 4.1 & 4.2, 2 points possible] thanks to the percentage of post-consumer recycled steel used to manufacture them. LEED certification letter is available on request.

The hexagonal head is engineered for installation using either a socket or a bit for multipurpose applications. The reinforced and tapered shoulder below the screw head ensures a tight fit in pre-drilled steel plate holes. The tapered shape enables the screw to self-center. The ASSY Kombi Long Threaded screw is equipped with a regular hexagonal head, to achieve the best steel-to-wood connections and is best driven in using the AW 40 Bit or a metric hexagonal socket. The engineered hex head makes them suitable for lifting of timber elements in conjunction with the Transport Anchor and the Yoke systems.




SpecificationASSY Kombi LTThread LengthAW Drive BitPackaging Qty.
# ItemMaterialHead
KLT1280Hardened SteelHexagonal Head1/2" x 3 1/8"12 x 802 3/4"70AW 4050
KLT12120Hardened SteelHexagonal Head1/2" x 4 3/4"12 x 1204"100AW 4050
KLT12160Hardened SteelHexagonal Head1/2" x 6 1/4"12 x 1605 3/4"145AW 4050
CAD Drawings

CAD Drawings

ProductASSY LT Kombi DiameterFile Extension
ASSY LT Kombi1/2"12
Design Guides

Design Guides

Structural Screw Design Guide

The most complete tool for high-capacity mass timber connections design using ICC and CCMC code approved ASSY structural fasteners.

Structural Mass Timber Fastening Design Guide

Companion to the Structural Screws Design Guide, it provides pre-designed, easy-to-read tables for tens of mass timber connections using high-capacity ASSY self-tapping screws.

Rigging Design Guide

A step-by-step guide to lift all engineered wood products available in North America using MTC Solutions OSHA & IHSA compliant Rigging Anchors. Do it right, do it safe!

Code Approvals

Code Approvals

ICC Code Approval ESR-3179 for Partially Threaded Fasteners - 2021 Edition (August)

CCMC Code Approval 13677-R

ISO 50001 Certification for ASSY Fasteners

LA Research Report (LARR): RR 26073

Installation Instructions

Installation Instructions

Structural Fasteners Installation Guide

The structural fasteners installation guide is a practical document designed to simplify the installation process of ASSY self-tapping screws.

White Papers

White Papers

Timber Moisture Content Changes and Associated Stress Predictions on Structural Wood Screws

4D+ Embedment Reduction Factor for Screws Loaded in Withdrawal

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