200 Pcs Lag Screws #14 x 5 in Structural Wood Screws - Heavy Duty

In this review the reviewer looks at a bulk pack of 200 #14 x 5 in structural lag screws aimed at builders, deck installers and serious DIYers. The bottom line is simple: if you need a large, consistently coated fastener that reduces driver torque and holds heavy timber connections without frequent coating failures, these screws deliver solid, predictable performance. The pack and head design are most valuable for repetitive construction tasks, while the T30 star drive and knurled thread make installation noticeably easier in wood applications.

Key Features

• Generous pack: The 200-count package keeps a steady supply on hand for large projects so you do not run out mid-job.
• Three-layer coating: The multilayer yellow coating resists corrosion and passed a 1000 hour salt spray test, offering durability in exterior use.
• Truss washer head: A larger bearing surface helps disperse load and keeps the connection surface cleaner under heavy timber loads.
• Knurled thread and self-tapping design: The knurled shaft reduces torque demand on the drill and helps cut threads into wood without excessive pre-drilling.
• T30 star drive: The star drive style reduces cam-out for safer, more efficient fastening with compatible bits.
• Sharp 17-groove tip: The pointed, grooved tip eases initial penetration and can reduce the need for pre-drilling in many wood species.

Who It's For

These lag screws are best for professional contractors, deck builders and homeowners tackling large structural projects who value a bulk supply and consistent fastener performance. The larger #14 size and 5 in length suit heavy timber connections, ledger installations and structural framing where strong bearing and corrosion resistance matter.

Those who should look elsewhere include people who only need a few fasteners for light tasks, or customers requiring stainless steel or a different finish for specialized corrosion environments; this product is a coated carbon steel fastener meant for general exterior use rather than marine-grade stainless applications.

Pros & Cons

Pros

• High quantity per pack provides good value for big projects and reduces reordering interruptions.
• Durable three-layer yellow coating held up to the 1000 hour salt spray test for improved exterior resistance.
• Knurled thread and sharp tip reduce required torque and can cut installation time by limiting pre-drilling needs.
• T30 star drive minimizes slipping and protects fastener heads during high-torque driving.

Cons

• The coated finish is not a substitute for stainless steel in harsh marine conditions, so buyers needing maximum corrosion resistance should select a different material.
• At #14 x 5 in these are heavy-duty and may be overkill for light carpentry or trim work.

Specifications

Brand	Threlaco
Quantity	200 pcs
Size	#14 x 5 in
Drive	T30 star drive
Head	Truss washer head
Coating	Three-layer yellow exterior coating
Tip and thread	17-groove sharp tip with knurled thread, self-tapping

Our Verdict

These 200 pack #14 x 5 in lag screws are a practical choice for builders who need reliable, coated structural fasteners in bulk; the truss washer head, knurled thread and T30 drive make installation faster and sturdier, and the proven salt spray resistance adds real exterior value for the price.

Frequently Asked Questions

Can these lag screws be used outdoors?
Yes, the three-layer coating passed a 1000 hour salt spray test and is intended for exterior applications, though extreme marine environments may call for stainless steel.

What driver bit is required?
The screws use a T30 star drive, so a T30 star bit or driver will be required for proper installation.

Do these screws require pre-drilling?
The knurled thread and sharp 17-groove tip reduce the need for pre-drilling in many wood types, but pre-drilling may still be advisable for very hard or split-prone timbers.