GRK Fasteners 5/16 in. x 3-1/8 in. RSS Star Drive Washer Head Alternative Lag Screw (5/16" x 3-1/8")

GRK’s RSS™ Rugged Structural Screw is a structural fastener designed for ease of installation and the strongest of connections. RSS fasteners drive into most woods without the need for pre-drilling. The specially engineered design results in a low-effort installation,
especially compared to conventional lag screws.

Fast Bite Tip: Provides a fast start for one-step installation
Zip-Tip™: Eliminates pre-drilling1
W-Cut™: Low torque, faster drive
Precision Fit: Reduces wobble between RSS screws and GRK bits for improved productivity2
Integrated Washer Head: Maximum clamping force
Star Drive Recess: Zero stripping, with 6 points of contact
GRK Head Markings: Easy identification of genuine GRK screws
CEE Thread™: Enlarges hole to reduce splitting3
Climatek™ Coating: ICC-ES AC257 code approved for use in treated lumber3
Code Approved: For structural applications (see ESR-2442)4
Some sizes also available in PHEINOX™ 305 and 316 grade Stainless Steel• For interior / exterior use