FastenMaster HeadLOK Heavy-Duty Flathead Fastener 11 in - No Predrill

In this review of the HeadLOK Heavy-Duty Flathead Fastener, the bottom line is simple: this is a time-saving wood-to-wood fastener for builders and serious DIYers who need stronger shear values than 3/8 in lag screws without predrilling. The reviewer found the 11 in length and aggressive threading make it reliable for deck framing, stair stringers and pressure-treated applications, while the patented Spider Drive noticeably reduced cam-out during driving. If you want a heavy-duty screw that zips in and eliminates washers, this HeadLOK fastener is worth considering.

Key Features

• Stronger shear design: Engineered to meet national code and offer greater shear values than 3/8 in lag screws, giving greater confidence in structural connections.
• No predrilling: Sharp gimlet point and aggressive threading allow the fastener to zip into wood or OSB without the time and effort of predrilling.
• Wafer head: Low-profile head removes the need for washers and increases pull-through resistance at connection points.
• Patented Spider Drive: The drive design virtually eliminates cam-out, improving bit life and reducing stripped heads on long runs.
• Included driver bit: Every package ships with a Spider Driver bit, so users can start work immediately without hunting for a compatible bit.
• American made: Manufactured in the USA, which can matter for contractors tracking material origin and quality control.

Who It's For

The HeadLOK 11 in fastener is aimed at contractors, framers and experienced DIYers who work with dimensional lumber and need a heavy-duty connector that saves time by removing the predrill step. It is especially well suited for deck framing, stair stringers, fencing, retaining walls and attaching rigid insulation panels where strong shear and pull-through resistance matter.

Those who should look elsewhere include users needing smaller or fine-finish screws for trim, or those working exclusively with metal or concrete where different fasteners are required. Also, if a flush countersink head or hidden-fastener aesthetic is required, a different screw head style may be preferable.

Pros & Cons

Pros

• Meets national code for stronger shear values than comparable 3/8 in lag screws, useful in structural framing.
• Installs without predrilling thanks to the gimlet point and aggressive threads, saving labor time.
• Spider Drive reduces cam-out and comes with a free driver bit, improving installation speed and consistency.
• Wafer head increases pull-through resistance and removes the need for washers on many connections.

Cons

• At 11 in length these are specialized; users needing shorter lengths will have to choose a different size.
• Designed for wood-to-wood; not intended as a substitute for fasteners required for metal-to-wood or concrete applications.

Specifications

Brand	FASTENMASTER
Product	HeadLOK Heavy-Duty Flathead Fastener
Length	11 in
Count	250 per package
Drive	Patented Spider Drive (bit included)
Head style	Wafer head (no washers needed)
Typical uses	Deck framing, stair stringers, fencing, cabinets, insulation panels

Our Verdict

The HeadLOK 11 in fastener is a practical, labor-saving choice for professionals and advanced DIYers who need higher shear strength and fast installation in wood-to-wood projects. Its no-predrill capability, wafer head and Spider Drive deliver reliable performance and good value for framing and structural tasks where pull-through and cam-out resistance matter.

Frequently Asked Questions

Do these require predrilling?
Answer. No, the gimlet point and aggressive threading allow installation without predrilling into wood or OSB in most applications.

Is a driver bit included?
Answer. Yes, every package includes a Spider Driver bit designed to work with the patented drive and reduce cam-out.

Can these replace 3/8 in lag screws?
Answer. Yes, they are engineered with stronger shear values than 3/8 in lag screws for wood-to-wood connections and are nationally code compliant for such use.