Simpson Strong-Tie SDHR31400-R25 Strong-Drive® SDHR COMBO-HEAD Screw — 0.315 in. x 4 in., Blue Zinc (25-Qty)

The Strong-Drive® SDHR Combo-Head screw is a structural fastener designed for cross-laminated timber construction, mass timber construction and general interior applications. These partially-threaded, sturdy 0.390 in. and 0.470 in. outer-diameter structural fasteners are designed to pull structural members together while providing excellent connection strength. The unique “combination” head allows for effortless driving using either a hex driver bit or T40 6-lobe driver bit. The SDHR Combo-Head has an interior-grade, blue-zinc coating, a robust knurled shaft and Type-17 point for fast starts and low-torque driving.

This Simpson product is designed for construction, connector, fastening, anchoring, and structural applications where dependable performance, durability, and jobsite-ready installation matter.

Features

• Designed for use with steel side plates
• Can be driven by either a hex-head or 6-lobe driver bit
• Heavy-duty, partially-threaded shaft with knurl provides strength, with superb pull-out resistance
• Type-17 point ensures fast starts, reduces installation torque and eliminates the need for predrilling in most applications
• Deep T40, 6-lobe recess for a secure drive
• Interior grade blue-zinc coating
• Shank diameter: 0.315 in. (8.1 mm)
• Length: 4 in. (100 mm)
• Quantity: 25 per package

Application

• Steel-to-Wood/Engineered Wood
• Engineered Wood
• Factory-Built/Modular Construction
• Mass Timber / Cross-Laminated Timber

Specifications

• ERP Part Number: SDHR31400-R25
• UPC: 707392012160
• GTIN: 707392012160
• Feature 01: Designed for use with steel side plates
• Feature 02: Can be driven by either a hex-head or 6-lobe driver bit
• Feature 03: Heavy-duty, partially-threaded shaft with knurl provides strength, with superb pull-out resistance
• Feature 04: Type-17 point ensures fast starts, reduces installation torque and eliminates the need for predrilling in most applications
• Feature 05: Deep T40, 6-lobe recess for a secure drive
• Feature 06: Interior grade blue-zinc coating
• Feature 07: Shank diameter: 0.315 in. (8.1 mm)
• Feature 08: Length: 4 in. (100 mm)
• Feature 09: Quantity: 25 per package
• Install With: Install using 6-lobe T40 or 17-mm hex-head driver bit
• Applications List: Steel-to-Wood/Engineered Wood
• Applications List.1: Engineered Wood
• Applications List.2: Factory-Built/Modular Construction
• Applications List.3: Mass Timber / Cross-Laminated Timber
• Assembled Depth - Imperial: 0.669
• Assembled Depth UOM - Imperial: in.
• Assembled Height - Imperial: 4
• Assembled Height UOM - Imperial: in.
• Assembled Width - Imperial: 0.669
• Assembled Width UOM - Imperial: in.
• Base Product ID: SDHR_Screw
• Base Product Name: Strong-Drive® SDHR COMBO-HEAD Screw
• Brand Name: Simpson Strong-Tie®
• Category Tree (Computed): Fasteners > Interior Wood Screws > Hand-Drive Screw
• Coating: Blue-Zinc Coated
• Country of Origin: TW
• Customer Unit: Yes
• Display Unit/Measure: EA
• Drive Type: T40 6-Lobe or Hex-Head
• GUID: 326307301664485004080182532067487668856
• Head Diameter (in.): 0.669
• Head Type: Combination
• Length (in.): 4
• Logo Image: https://images.salsify.com/image/upload/s--Lkh4Jm6c--/vkrqlmpfxgflsa4yytuq.png
• Measurement Unit Text: each
• MFG Name: Simpson Strong-Tie®
• Number Category Description: UPC
• Packaging Quantity: 25
• Packaging Type: Mini-Bulk
• Point Type: Type-17 Point
• Product Class: Hand-Drive Screw
• Product Includes: Includes T40, 6-lobe driver bit (replacement bit: BIT40T-134-R2)
• Prop 65 - Cancer: Wood Dust
• Prop 65 - Long Text: WARNING! This product can expose you to chemicals including wood dust which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov
• Prop 65 - Short Text: WARNING! Cancer - www.P65Warnings.ca.gov
• Prop 65 Warning: Yes
• Quantity: 1
• Shank Diameter (in.): 0.315
• Shipping Weight: 3
• Short Product Name: SDHR 31 x 4IN zinc 25ct
• Strongtie.com URL: https://www.strongtie.com/strongdrive_interiorwoodscrews/sdhr_screw/p/strong-drive-sdhr-combo-head-screw
• Subcategory: Fasteners
• Subcategory 2: Interior Wood Screws
• Thread Length (in.): 2 1/8
• Warranty PDF: https://images.salsify.com/image/upload/s--K_9ww28_--/bgqxyqo1uhaqsqcvudu7.pdf
• Brand Video: https://images.salsify.com/video/upload/s--N-SMFYx9--/wpz3sdgci9c512ppr9df.mp4
• CAR Reference: 10707392012167
• PAL Reference: 50707392012165