When you need dependable torque and clean driving, square head screws deliver consistent performance. The deep square recess reduces cam-out and keeps the bit engaged, even during high-torque fastening. For contractors and serious DIYers, that means fewer interruptions and smoother installs.
Stainless steel options in this collection are well-suited for exterior decks, fencing, and specialty wood construction where corrosion resistance matters.
Type 305 Stainless Steel - Wood Screws Type 17 notched point for fast penetration Self-countersinking bugle head Square drive recess reduces driver cam-out Threaded approximately 2/3 of shank on most sizes Deep coarse threads for better hold Important Installation Instructions: If the screws are to be driven by a screw gun, be sure the bit is securely seated in the square recess of the screw. Start slowly and gradually increase speed until the head is driven flush. A high driving speed increases the chance of stripping the square drive recess. If the tool has an adjustable torque collar, use a piece of scrap lumber to determine the proper setting needed to drive the head flush with the surface. This will prevent twisting off the screw head.
$103.10 - $462.20
For Attaching Fiber Cement Siding through Furring Strips to Wood Studs Fasten fiber cement to stressed-skin panels or lap siding to wood .390" diameter wafer head with countersinking nibs #2 square drive - threaded full length Type 17 point with coarse threads Type 316 Stainless Steel for the ultimate in corrosion resistance Use 1-1/4" screws to attach fiber cement siding to Stress-Skin panels Use 1-5/8" & 2-1/4" screws to blind fasten fiber cement lap siding to wood studs AISI Grade 316 Stainless Steel has lower carbon content than 305 or 302HQ and contains molybdenum for superior corrosion resistance in salt water and other highly corrosive environments. It is the grade of stainless steel to be specified in any seaside application.
$56.60 - $272.00
316 Stainless Steel - Wood Screws Salt Water Safe Type 17 notched point for fast penetration Self-countersinking bugle head Square drive recess reduces driver cam-out Threaded approximately 2/3 of shank on most sizes Deep coarse threads for better hold Use with cedar, redwood, engineered wood and preservative treated *Type 316 Stainless Steel should always be specified for salt water applications. 316 grade stainless steel has a lower carbon content than 18-8 type stainless (302HQ, 304 and 305) and contains molybdenum for superior corrosion resistance in salt water and other highly corrosive environments. It is the grade of stainless steel to be specified in any seaside application to prevent rusting & bleeding through. Important Installation Instructions: If the screws are to be driven by a screw gun, be sure the bit is securely seated in the square recess of the screw. Start slowly and gradually increase speed until the head is driven flush. A high driving speed increases the chance of stripping the square drive recess. If the tool has an adjustable torque collar, use a piece of scrap lumber to determine the proper setting needed to drive the head flush with the surface. This will prevent twisting off the screw head.
$20.75 - $571.40
Square Drive #1 Square Drive - small unobtrusive .230" head Type 17 point for fast penetration Self-countersinking trim head Square drive recess reduces driver cam-out problems Dry lubricated with non-stick film Our stainless steel trim head screws are threaded approximately 2/3 of shank Available in AISI type 305 and 316 stainless steel AISI Grade 316 Stainless Steel has a lower carbon content than 305 or 302HQ and contains molybdenum for superior corrosion resistance in salt water and other highly corrosive environments. It is the grade of stainless steel to be specified in any seaside application.
$103.05 - $571.40
This screw fastens all materials to wood or wood substitute materials. #2 Square Drive Type 17 point Course Thread
$21.40 - $223.30
For Attaching Fiber Cement Siding through Furring Strips to Steel Studs Hardened 410 Stainless Steel .390" diameter ribbed wafer head with self-countersinking nibs #3 drill point - tapping screw thread #2 square drive #8 x 1-5/8" threaded to within 5/16" of top of head #8 x 2-1/4" threaded approximately 2/3 of shank
$192.55 - $503.65
