Jake Sales 5/16in x 4in Construction Lag Screws - Heavy Duty Box

In this review of the Jake Sales 5/16in x 4in construction lag screws, the bottom line is simple: these are intended for builders and contractors who need heavy duty, corrosion resistant fasteners that bite quickly and pull lumber tight. The reviewer found the Type 17 notched point and heat treated steel deliver real performance gains when fastening thick timbers and decking; the screws start without walking and the triple coating stood up to corrosive conditions in lab testing, making them a practical choice for outdoor structural work.

Key Features

• Type 17 Point: The notched, extra sharp point offers quick starts and reduces the need for pre-drilling in many framing situations.
• Heat Treated Steel: Manufactured from high quality heat treated steel for improved shear and compression strength compared with common lag bolts.
• Triple Coating: A triple coated finish provides corrosion resistance suitable for ACQ treated lumber and extended outdoor exposure.
• 1200 Hour Salt Spray Resistance: Passed an extensive salt spray test without coating failures, indicating durability in coastal or humid environments.
• Modified Truss Washer Head: The larger head diameter helps pull 4x and larger members tight and distributes load under the head.

Who It's For

This screw is aimed at professional carpenters, deck builders, and serious DIYers who regularly work with large dimensional lumber and need a fastener that excels in shear and compression. The combination of a Type 17 point and heat treated steel makes it well suited to structural connections where strength and quick starts save time.

Those doing only light interior fixtures or working exclusively with soft materials may find smaller or simpler screws sufficient and less costly; also, if countersinking aesthetic heads is critical, consider alternate fasteners designed for concealed finishes.

Pros & Cons

Pros

• Excellent holding power and strength for structural joins due to heat treated steel and robust thread profile.
• Type 17 notched point reduces walking and often removes the need for pilot holes, speeding installation.
• Triple coated finish and 1200 hour salt spray performance mean good corrosion resistance for outdoor use with ACQ lumber.

Cons

• At 4in length and larger head, these are overkill for light-duty or trim applications where smaller screws are more appropriate.
• Heavy duty construction means they require the correct driver and torque; using improper tools can strip the Torx drive.

Specifications

Screw Thread Diameter	~5/16in
Head Diameter	11/16in
Length	4in
Point Type	Type 17 notched extra sharp
Material	High quality heat treated steel
Finish	Triple coated, ACQ compatible
Salt Spray Test	1200 hour test without coating failures

Our Verdict

The Jake Sales 5/16in x 4in construction lag screws are a dependable, value-oriented option for builders who need heavy duty, corrosion resistant fasteners that start cleanly and hold large members tightly. They are particularly good for decks, pergolas, and structural timber work where ACQ compatibility and shear strength matter.

Frequently Asked Questions

Are these screws suitable for treated lumber?
Yes, the triple coating is specified as ACQ treated lumber compatible and they passed a 1200 hour salt spray resistance test.

Do these require pre-drilling?
The Type 17 notched point reduces the need for pre-drilling in many cases, though pilot holes may still be advisable in very dense hardwoods.

What drive type do they use?
They use a Torx/Star drive which improves torque transfer and reduces cam-out compared with standard screw drives.