3/8 x 6 Stainless Lag Bolt (25-Pack) - Heavy Duty 18-8 Stainless

Our review of the 3/8 in x 6 in Stainless Lag Bolt (25-Pack) finds it a solid choice for anyone replacing rusted hardware or fastening heavy timber. These lag screws are made from mill certified 18-8 stainless steel and meet ASME B18.2.1 standards, which is the single biggest reason to consider them: corrosion resistance and consistent manufacturing quality for long-term outdoor or structural use. The 25-per-bag quantity and heavy duty hex head make them convenient for small jobs or for stocking a workshop.

Key Features

• 18-8 (304) stainless construction: Provides reliable corrosion resistance for exterior and moisture-prone applications.
• 6 in length and 3/8 in diameter: Offers deep bite and shear strength ideal for timber and large beams.
• Hex head with 9/16 in size: Allows high torque installation with common sockets and reduces rounding during driving.
• Pack of 25: Supplies enough fasteners for multiple projects without buying in bulk quantities.
• ASME B18.2.1 tested: Ensures dimensional consistency and commercial/industrial grade reliability.
• Pilot hole recommended: Helps prevent splitting in hardwoods and ensures straighter, easier installation.

Who It's For

These lag bolts are aimed at contractors, deck builders, and DIYers who need durable stainless fasteners for outdoor structures, large timber repairs, or replacing rusted lag screws. The combination of 6 in length and 3/8 in diameter gives enough holding power for beams, ledger boards, and heavy framing where corrosion resistance matters.

Those who should look elsewhere include buyers needing metric sizes, shorter or much longer lengths, or specialty coatings beyond stainless; also users on a strict budget who prefer cheaper plated steel for interior non-corrosive projects may find stainless overkill.

Pros & Cons

Pros

• High-quality stainless steel construction resists rust and holds up in outdoor environments.
• Commercial grade and ASME-tested for consistent dimensions and fit with standard hardware.
• Hex head design accepts common sockets and handles high torque without stripping.
• 25-pack quantity is convenient for repeat tasks and small professional jobs.

Cons

• Some customers note the value is mixed as stainless options cost more than plain steel alternatives.
• Pilot holes are recommended, adding time and requiring appropriate bits for best results.

Specifications

Diameter	3/8 in
Length	6 in (measured from bottom of head to point)
Head size	9/16 in hex
Material	18-8 (304) stainless steel
Quantity	25 lag screws per bag
Standard	Tested to meet ASME B18.2.1

Our Verdict

The 3/8 in x 6 in Stainless Lag Bolt (25-Pack) is a reliable, heavy duty option for outdoor and structural woodwork where corrosion resistance and consistent sizing matter. Professional installers and serious DIYers will appreciate the durability and ASME-tested quality; budget buyers for interior tasks may prefer a less expensive plated fastener.

Frequently Asked Questions

Are pilot holes necessary?
Yes. A pilot hole is recommended to prevent splitting and to make driving these 6 in lag screws easier, especially in hardwoods.

What material are these screws made from?
They are manufactured from mill certified 18-8 (304) stainless steel for corrosion resistance.

How many screws come in a pack?
The product is packaged with 25 lag screws per bag for small projects or replacement work.