4-1/4 in. SIPHD Heavy-Duty T-30 Flat-Head Fine-Thread Self-Drill TRU-KOTE Screws (500 Pack) | TFS-SIPHD-4250

TRUFAST's SIPHD Heavy-Duty T-30 Fine-Thread Self-Drill TRU-KOTE Screws are commonly used in residential and commercial SIP assemblies where fastener performance directly impacts panel integrity. The extended length supports thick panel connections, and the heavy-duty construction helps maintain consistent clamping force across large assemblies. Packaged for professional use, these screws support efficient installation and reliable structural performance over the life of the building envelope.

• Designed for attaching panels to 16 ga. - 3/16 in. steel members without pre-drilling
• Specifically engineered for attaching structural insulated panels (SIPs) and nailable insulation panels to wood and steel substrates
• Features a large, pancake head with a 6-lobe drive
• Drives quickly and smoothly, and draw panels securely without the need of a washer
• Two T-30 Driver Bits included in each package