Simpson Strong-Drive SDHR COMBO-HEAD Screw - 10 mm x 160 mm, Black E-Coat by Simpson Strong-Tie is a heavy-duty structural fastener engineered for cross-laminated timber (CLT), mass timber construction, and general interior wood applications. The combination hex and 6-lobe head design gives installers the flexibility to drive with either a 15 mm hex-head bit or a T40 6-lobe bit, reducing tool dependency on the job site. Built with a robust knurled shank, a Type-17 self-drilling point, and a black e-coat electrocoating finish, this screw delivers reliable connection strength in dry-service structural conditions - including steel-to-wood and engineered wood assemblies.

Key Features

• Black e-coat electrocoating finish - provides a construction-durable, nonmetallic, and friction-reducing surface for corrosion resistance in interior dry-service conditions, keeping connections protected without metallic coatings
• Optimized hardness profile - helps mitigate field embrittlement issues and is compliant with CSA O86:24 hydrogen embrittlement requirements, giving builders confidence in structural integrity
• Combination (combo) head with T40 6-lobe recess and 15 mm hex compatibility - allows use of either driver type for a secure, slip-resistant drive in demanding applications
• Heavy-duty shank with robust knurl - reduces installation torque during driving, helping installers work faster with less effort
• Type-17 point - ensures fast starts, reduces torque during driving, and eliminates the need for predrilling in most wood applications, saving significant time on large timber projects
• Designed for use with steel side plates - makes this screw a dependable choice for steel-to-wood structural connections including angle connectors and plate hardware
• Partially threaded shank - thread length of 4 3/8 in. draws connected members tightly together for strong, gap-free structural joints
• 6 1/4 in. (160 mm) length - provides the depth needed to achieve full structural engagement in thick timber members and CLT panels

Why This Product

• Built for mass timber and CLT construction - the combination of a long 160 mm body, partial threading, and a knurled shank makes this screw specifically suited for the thick timber members and steel connector assemblies common in CLT and engineered wood structures
• No predrilling required in most applications - the Type-17 self-drilling point gets into wood faster and without the extra step of pilot hole preparation, which is a meaningful time saver on large timber framing projects
• Dual-drive compatibility reduces downtime - the combo head accepts both a T40 6-lobe bit and a 15 mm hex-head driver, so crews can keep working even when one driver type is unavailable
• CSA O86:24 compliant hardness profile - the optimized hardness reduces the risk of field embrittlement, addressing a critical quality concern for structural screw applications in engineered wood systems

Specifications

• Brand: Simpson Strong-Tie
• Product Name: Strong-Drive SDHR COMBO-HEAD Screw
• Length: 6 1/4 in. (160 mm)
• Shank Diameter: 0.275 in.
• Head Diameter: 0.590 in.
• Thread Length: 4 3/8 in.
• Head Type: Combination
• Drive Type: T40 6-Lobe or Hex-Head
• Point Type: Type-17 Point
• Finish: E-coat Electrocoating
• Coating: E-coat Electrocoating
• Color: Black