MTW™ Mass Timber Angled Washer
Product Details
Inclined screws greatly increase the strength and stiffness of mass timber connections. The Simpson Strong-Tie® MTW45-8 is designed for use with a wide variety of connection plates and 8 mm-diameter Simpson Strong-Tie Strong-Drive® SDCF Timber-CF screws driven at a 45º angle.
Key Features
- Recessed hole provides a clean finish with the SDCF countersunk head
- Guides screw to an accurate 45º angle
- High capacity reduces number of screws required in a connection
- Material: ASTM A27, Grade 70–40
- Finish: Zinc electroplated
Installation
- Use all specified MTW45-8 washers and Strong-Drive SDCF Timber-CF screws.
- Allowable connector plate thickness is 10 gauge (0.134") minimum and 1/2" maximum, with minimum specified tensile properties of Fy = 33 ksi and Fu = 45 ksi.
- Fabricate plates with obround holes as given in the installation images. If plates are galvanized after holes are punched, oversize holes to account for galvanized thickness.
- Insert MTW45-8 into obround holes and drive Strong-Drive SDCF Timber-CF screws at a 45º angle in the direction specified by the designer. Countersunk screw heads shall be fully seated into MTW45-8 screw hole.
Loads
- Allowable loads for straps using the MTW45-8 are the responsibility of the designer. See L-MTW45SDCF for design information.
Related Links
Catalog Pages
Related Literature
Product Information Table
| Model No. | Coating/Material | Packaging Qty. |
|---|---|---|
|
Footnotes
|
||
| MTW45-8-R10 | Zinc Galvanized, G90 | 10 |
Load Tables
Allowable Tension Loads
| Washer | Fastener | Fastener Dimensions (in.) | Group Action Factor | Reference Allowable Shear Load (lb.) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Length, L |
Thread Length, T |
Major Thread Diameter | Minor (root) Thread Diameter | DF/SP | SPF/HF | |||||||||
| Steel Side Plate Thickness | Steel Side Plate Thickness | |||||||||||||
| 10 gage (0.134") | 1/4" | 3/8" | 1/2" | 10 gage (0.134") | 1/4" | 3/8" | 1/2" | |||||||
| MTW45-8 | SDCF22434 | 4.72 | 4.29 | 0.315 | 0.205 | 0.75 | 765 | 730 | 700 | 665 | 655 | 630 | 600 | 575 |
| MTW45-8 | SDCF22512 | 5.51 | 5.08 | 0.315 | 0.205 | 0.75 | 910 | 880 | 845 | 815 | 785 | 760 | 730 | 700 |
| MTW45-8 | SDCF22614 | 6.3 | 5.87 | 0.315 | 0.205 | 0.75 | 1,060 | 1,030 | 995 | 965 | 915 | 885 | 860 | 830 |
| MTW45-8 | SDCF22700 | 7.09 | 6.65 | 0.315 | 0.205 | 0.9 | 1,210 | 1,180 | 1,145 | 1,100 | 1,040 | 1,015 | 985 | 955 |
| MTW45-8 | SDCF22858 | 8.66 | 8.23 | 0.315 | 0.205 | 0.9 | 1,210 | 1,210 | 1,210 | 1,210 | 1,210 | 1,210 | 1,210 | 1,210 |
- Tabulated loads are for MTW45-8 with SDCF22 screws installed with minimum edge distance of 1 5/8" and side plate thicknesses shown. Maximum side plate thickness is 1/2".
- Tabulated loads may be linearly interpolated for intermediate side-plate thicknesses. See engineering letter, L-F-MTW45SDCF for additional information.
- For SDCF screws longer than 7 in., the reference allowable shear load is 1,210 lb. for any wood specific gravity or equivalent specific gravity, and side plate thickness up to 1/2".
- Allowable loads are shown at the wood load duration factor of CD = 1.00. Loads may be increased for load duration as permitted by the building code up to a CD = 1.60.
- For LRF D values, the reference connection design values shall be adjusted in accordance with NDS®-2018, Section 11.3
- When MTW45-8 with SDCF22 fasteners are installed in groups, the group action factor should be applied.
Code Reports & Compliance
Drawings
| DWG | DXF | RFA | IFC | SAT | |||
|---|---|---|---|---|---|---|---|
