Hillman Fasteners 41600 No. 10 X 2.5 in Ss Flat Head Screw 25-pack

Product Description

The HILLMAN FASTENERS 41600 is a No. 10 x 2.5-inch flat countersunk head screw made from Type 305 stainless steel. It features a No. 2 square recess drive, which provides a positive bit engagement and reduces cam-out during installation. The flat countersunk head sits flush with or below the work surface when driven into a pre-countersunk hole. These screws are sold in a 25-piece pack and are suited for structural, exterior, and corrosion-sensitive fastening applications where standard carbon steel fasteners would fail prematurely. Licensed tradespeople and experienced DIYers use these in decking, trim, and marine-adjacent assemblies.

Type 305 stainless steel provides strong corrosion resistance, making these screws appropriate for outdoor, coastal, and high-humidity environments. Typical applications include wood decking, fascia boards, exterior trim, dock and marina hardware, and other installations where moisture exposure is a constant factor. The flat countersunk head profile makes them a practical choice wherever a flush or recessed finish is required. The No. 2 square recess drive is compatible with standard square-drive bits common in contractor tool kits.

Key Features

• Type 305 stainless steel construction for strong corrosion and oxidation resistance
• Flat countersunk head seats flush with the work surface when driven into a countersunk hole
• No. 2 square recess drive reduces cam-out compared to slotted or Phillips drives
• No. 10 x 2.5-inch size suits medium-duty wood-to-wood and wood-to-substrate fastening
• 25-piece pack provides a practical job-site quantity for small-to-medium fastening tasks

Compatibility

Designed for use in wood, composite, and similar substrate applications requiring a No. 10 x 2.5-inch flat countersunk fastener with a No. 2 square recess drive. Compatible with any standard No. 2 square-drive bit.

Installation Notes

A licensed carpenter, contractor, or qualified tradesperson should confirm fastener spec requirements before installation in structural or load-bearing applications. Pre-drilling and countersinking the receiving material is recommended to achieve a flush head seating and prevent splitting, especially in hardwoods. Use a No. 2 square-drive bit at controlled torque to avoid overdriving and stripping the recess. Consult applicable building codes when using fasteners in decking, framing, or other regulated assemblies.