Simpson Strong-Tie F12C250FDB Self-Drilling Flat-Head Screw with Wings, #12 x 2-1/2-in. #3 Square Type 410, 1800-Pack

• Flat countersunk head with self-countersinking nibs
• Machine screw thread, threaded full length
• Shank slot enhances thread formation in steel and removes exhaust
• Wings above drill point provide clearance hole in work piece so it won’t climb up the shank; wings break off as point engages the steel substrate
• Compatible driver bit: #2 square drive (model BIT3S-2-R2)
• 2-1/2 in. length for 2x wood
• Type 410 stainless steel is coated for additional corrosion protection
• Quantity: 1,800

Use this screw for securing wood, plywood and fiber cement to steel (up to 0.209″ thick). Wings bore through wood to create a clearance hole so piece does not climb up shank and then break off as they engage with steel.

• Flat countersunk head with self-countersinking nibs
• Machine screw thread, threaded full length
• Shank slot enhances thread formation in steel and removes exhaust
• Wings above drill point provide clearance hole in work piece so it won’t climb up the shank; wings break off as point engages the steel substrate
• Compatible driver bit: #2 square drive (model BIT3S-2-R2)
• 2-1/2 in. length for 2x wood
• Type 410 stainless steel is coated for additional corrosion protection
• Quantity: 1,800