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Cross-Laminated Timber Screws

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  • Simpson Strong-Tie Timber CFC flat head screw with black e coat Simpson Strong-Tie Timber CFC flat head screw with black e coat
    ICC Certified

    SDCFC8X120-R50

    Simpson Strong-Tie SDCFC Timber-CFC Cylinder Head Screw - Black E-Coat

    Designed for interior mass-timber and cross-laminated timber (CLT) applications.

    Diameters

    0.315" 0.390"

    Lengths

    4-3/4" 6-1/4" 7-7/8" 9-1/2" 11" 11-3/4" 12-1/2" 13" 13-3/4" 15" 17" 19-5/8" 22-7/8" 23-5/8" 31-1/2" 39-3/8"

    Quantities

    25 30 50 100 150 200 250
    Starting at $8999
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  • Simpson Strong-Tie Timber CF flat head screw with black e coat Simpson Strong-Tie Timber CF flat head screw with black e coat
    ICC Certified

    SDCF8X120-R50

    Simpson Strong-Tie SDCF Timber-CF Flat Head Screw - Black E-Coat

    For wood-to-wood mass timber and cross-laminated timber applications in dry, interior conditions.

    Diameters

    0.315" 0.390" 0.470"

    Lengths

    4" 4-3/4" 5-1/2" 6-1/4" 7" 7-7/8" 8-5/8" 9-1/2" 10-1/4" 11" 11-3/4" 13-3/4" 14" 15-3/4" 17-3/4" 23-5/8"

    Quantities

    25 30 50 100 150 200 250
    Starting at $6499
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  • Simpson Strong-Tie 8mm x 80mm SDCP Timber-CP Screw - Black E-Coat Simpson Strong-Tie 8mm x 80mm SDCP Timber-CP Screw - Black E-Coat - Head View

    SDCP8X80-R50

    Simpson Strong-Tie SDCP Timber-CP Screw - Black E-Coat

    Outside Diameter

    8mm 10mm

    Lengths

    80mm 120mm 140mm 160mm 180mm 220mm 240mm 280mm 300mm 100mm 200mm 320mm 360mm

    Quantities

    25 30 50 150 250
    Starting at $3499
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  • ICC Certified

    SDHR27400-R25

    0.390" Strong-Drive SDHR Combo-Head Screw - Zinc

    Designed For Cross-Laminated Timber

    Lengths

    4" 6-1/4"

    Quantities

    25 100
    Starting at $5200
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  • MTW45-8-R10

    Simpson MTW45-8-R10 Mass-Timber Angled Washer, Pkg 10

    Increases the strength and stiffness of mass timber connections

    $5799
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  • Simpson Strong-Tie SDHR metal to wood combo head screw black e coat Simpson Strong-Tie SDHR metal to wood combo head screw black e coat
    ICC Certified

    SDHR10X100-R25

    Simpson Strong-Tie SDHR Metal-To-Wood Combo-Head Screw - Black E-Coat

    Designed to provide excellent connection strength when connecting steel side plates to wood

    Diameters

    0.275" 0.315"

    Lengths

    4" 6-1/4"

    Quantities

    25 100
    Starting at $4799
    Free Shipping on orders $199+
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Cross-Laminated Timber (CLT) Screws

Cross-laminated timber screws are engineered for use in mass timber construction, providing the strength and length needed to fasten CLT panels, glulam beams, and other engineered wood members. These long structural screws eliminate the need for traditional through-bolts, making installation faster, cleaner, and fully code-compliant for today’s modern building projects.

Why Choose CLT Screws?

  • Extra Length: Available in long sizes designed specifically to penetrate thick CLT panels and engineered wood members.
  • High Load Capacity: Provides superior shear and withdrawal resistance compared to nails or bolts.
  • Faster Installation: Self-tapping design eliminates pre-drilling in most applications, saving time on the jobsite.
  • Code-Compliant: Tested and approved for structural CLT and glulam connections.
  • Corrosion Resistant: Protective coatings make them suitable for both interior and exterior mass timber applications.

When to Use CLT Screws

CLT screws are designed for modern engineered wood construction projects that demand both strength and efficiency. Common applications include:

  • Fastening CLT panels in mass timber walls, floors, and roofs
  • Securing glulam beams and posts
  • Attaching structural timber members without through-bolts
  • Large-scale residential, commercial, and institutional timber projects

By using CLT screws, builders reduce labor time, avoid the mess of through-bolting, and achieve reliable, code-compliant connections in large timber assemblies.

Cross-Laminated Timber Screws FAQ

What makes CLT screws different from regular structural screws?

CLT screws are engineered in extra-long lengths to fasten thick CLT panels and engineered wood members. Standard structural screws are often too short or not rated for these applications.

Do CLT screws replace through-bolts?

Yes. CLT screws are designed to replace traditional bolting methods, offering easier installation, cleaner finishes, and equal or greater structural performance.

Are CLT screws code approved?

Yes. Many CLT screws are ICC-ES approved for use in mass timber applications, ensuring compliance with building codes and engineering specifications.

Can CLT screws be used outdoors?

Yes. Many are available with corrosion-resistant coatings or stainless steel options, making them suitable for exterior timber construction.

Still have questions about structural wood screws? Check out our FAQ on Structural Screws, or learn What are Better: Nails or Screws.

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