#17 x 10 Construction Lag Screw Full Box - Heavy Duty Structural

In this review the focus is on a full box of #17 x 10 construction lag screws aimed at builders and serious DIYers who need reliable structural fasteners. The bottom line: these screws stand out for heavy duty performance and corrosion resistance, making them a practical choice for deck and outdoor framing projects where strength and long-term reliability matter most. Our review finds the most compelling reason to buy is the combination of a Type 17 extra sharp point that starts quickly and a triple-coated finish that passed a 1200 hour salt spray test, delivering durable holding power in harsher conditions.

Key Features

• Dimensions: The ~5/16in thread diameter and 10in length provide deep embedment for secure connections in large timbers.
• Head design: The 11/16in modified truss washer head spreads clamping force and helps pull lumber tight during assembly.
• Drive: Torx/star drive gives better torque transfer and reduces cam-out compared with standard slotted or Phillips heads.
• Point type: The Type 17 notched extra sharp point starts quickly and reduces the need for pre-drilling in many applications.
• Corrosion resistance: Triple coated finish and ACQ compatibility passed a 1200 hour salt spray test, offering long-term protection in exterior builds.
• Material quality: Manufactured from heat treated steel for improved shear and compression performance over common lag bolts.

Who It's For

These lag screws are best for contractors, deck builders, and homeowners tackling structural outdoor projects where strong long-lasting fasteners are required. The 10in length and robust thread diameter make them suited to 4x6s, large beams, and connection points that demand deep holding power and reliable clamp-down.

Those who should look elsewhere include casual users who only need occasional light-duty screws or anyone working exclusively with thin or delicate materials where a smaller fastener would be more appropriate. If you require specialty stainless steel for extreme marine exposure, consult a corrosion specialist for the exact grade needed.

Pros & Cons

Pros

• High strength heat treated steel gives superior shear and compression resistance for structural connections.
• Triple coated finish and ACQ compatibility deliver proven corrosion resistance after extensive salt spray testing.
• Type 17 notched point and Torx drive speed up installation and reduce walking and cam-out.
• Full box count provides good value for recurring jobs or large projects.

Cons

• At 10in length and ~5/16in diameter these screws are overkill for small-scale or delicate projects.
• Triple coating is protective, but for some extreme marine uses a specific stainless option may still be preferred.

Specifications

Our Verdict

These #17 x 10 construction lag screws are a practical, value-oriented option for anyone building decks, pergolas, or heavy timber connections. Their combination of a Type 17 point, Torx drive, heat treated steel, and a proven triple-coated finish offers dependable holding power and corrosion resistance, making them a solid buy for structural outdoor projects where durability and strength are priorities.

Frequently Asked Questions

Are these screws suitable for ACQ treated lumber?
Yes, the triple coated finish is specified as ACQ compatible to resist corrosion with treated lumber.

Will I need to pre-drill for these 10in screws?
The Type 17 notched extra sharp point reduces the need for pre-drilling in many cases, though pre-drilling may still be advisable for very dense timbers or precise alignment.

Do they resist saltwater corrosion?
The coating passed a 1200 hour salt spray test without failures, indicating good corrosion resistance for exterior use, though stainless options may be chosen for severe marine exposure.