Simpson Strong-Tie Trim-Head Screw - Square Drive, Type 305 Stainless

Ideal for decking applications, this trim-head screw features a square drive for secure, slip-free engagement during installation. The low-profile, trim-style head sits flush with the surface, delivering a clean finish. A Type-17 point allows for quick starts, while coarse threads on the lower two-thirds of the shank provide powerful pull-through - drawing deck boards tightly to the joists for a secure hold. 

This trim-head, square-drive screw includes models in both Type 305 and Type 316 stainless steel for corrosion resistance and is available in stainless steel with a 6-lobe drive (and painted heads) for hand-drive applications, as well as in collated square-drive versions (with and without painted heads) for our Quik Drive® auto-feed screw driving systems.

• Trim-style head for flush seating and cleaner appearance on decking surfaces
• Square-drive design for easy installation and secure driving
• Type-17 point for fast starts
• Coarse threads on approximately two-thirds of the shank for pulling the decking and other material tightly to the framing
• Predrilling recommended near board ends to prevent splitting
• Driver bit included in each package
• Replacement bit part number: BIT1S-2-R2
• 350-count packs contain enough screws to fasten 100 sq. ft. of decking (6" nominal-width boards installed on 16" o.c. joists)
• Choose Type 316 stainless steel for seaside applications and superior corrosion resistance

Specifications (all models)

• Material: Type 305 Stainless Steel

Available options (see each model for exact values)

• Fastener Callout Size: #7 x 1 in., #7 x 1-1/4 in., #7 x 1-5/8 in., #7 x 2 in., #7 x 2-1/4 in., #7 x 2-1/2 in., #7 x 3 in., #9 x 3-1/2 in., #9 x 4 in.
• Screw Size: #7, #9
• Length (in.): 1, 1 1/4, 1 5/8, 2, 2 1/4, 2 1/2, 3, 3 1/2, 4
• Length (mm): 25, 32, 41, 51, 57, 64, 76, 89, 102
• Head Diameter (in.): 0.230, 0.250
• Drive Type: #1 Square, #2 Square
• Packaging Type: Clamshell, Tub, Bucket
• Approx. Count per lb: 61, 62, 98, 126, 138, 154, 195, 256, 316