SPAX 1/4" x 3" Exterior Washer Head Structural Wood Lag Screws Powerlags Torx T-Star (50 EA) Bit Included Heavy Duty Rust Resistant

I used several hundred of these screws on a small cattle barn and corral I built. They have plenty of holding power. Only one broke and I’m pretty sure that was my fault. Be sure to use with a good impact driver!!

Great structural screw for use in treated lumber and composite lumber. I used in building a large deck with composite lumber, has great pullout resistance and corrosion resistance and the washer head holds pieces together tight.

Love these ! Wish I could get them local!!

Extra sturdy and the washer head keeps your screw from sinking through without pulling the boards together like deck screw tend to do. I’m building a barn with them and haven’t regretted using them. Fantastic product for a low price.

Excellent product prompt shipping

TLDR: Spax stands behind their product and provides great customer support; will definitely buy again. I don't leave reviews very often, but I was so impressed I thought this was worth sharing. I was doing a large project on my deck and was replacing some old posts/railings. These screws arrived and they were not an actual .250" diameter; they were thinner (.200", if I recall correctly). The rest of the hardware I was using would not work as well with those tolerances, so I returned them. These screws are shipped directly from Spax, and not an Amazon warehouse. The only return option available to me was shipping them back to Spax via UPS. When I took the screws to The UPS Store along with several other Amazon returns, the UPS employee slapped a label on it and gave me a receipt. As time passed and I realized my refund hadn't come yet, I checked the tracking number and realized a mistake was made. The UPS employee printed the wrong shipping label and the bucket of screws was sent back to the wrong location (UPS said it went to an Amazon return center in another state instead of shipping it back to Spax like they were supposed to). I spoke to four people from UPS who took no responsibility for the mistake (including the employee who made the mistake and a manager) and UPS ultimately told me to talk to Amazon; UPS said Amazon got it, so Amazon should give me a refund. The Amazon rep understood the issue but was unable to explain it very well to Spax; the Amazon rep also stated it was UPS's mistake and did not understand why UPS didn't do something to help me. I agreed and was pretty frustrated at this point. The Amazon rep asked Spax to reach out to me, the customer. I was able to send the Spax rep screenshots and pictures, and the Spax rep immediately owned the situation. They processed the refund without delay and gained one very satisfied customer.

Bought some 8 years ago, more in Dec 2022. Used to buld and/or repair rose beds made with 4x4 'ground contact timbers'. Some of the timbers have been eaten by carpenter ants and/or rotted. While deconstructing these beds to do timber replacements, I have retreived many of the Spax screws. I cleaned them of debris and found them to be in as-new condition. Some of them I had to cut with a sawzall (darn!) in order to get the old timbers out when the heads weren't accessible. This was very difficult work using the best metal cutting blades! I will never use any other fasteners for these beds and other exterior projects! Thank you SpaxUS for a superior product.

I sunk a a couple hundred of the 5/16 X 6 inch lag screws in my landscape projects this past year which was mostly 4X4 plastic recycled logs and wood logs. The 5/16 version uses T40 heads which are much more robust than another brand's T30 heads. If I had to remove the 5/16 screws for one reason or another (screw-up), the T40 head was usually worn enough to not trust to be reused. I am currently building a gravel pad for a shed with a 10 inch grade out of 4X6's. Used 1/2" rebar for lower tiers and 5/16 lag screws. Ordered 3/8" X 6 inch from Amazon and used those for the upper tiers. What a difference 1/16 makes. The flighting and the head are so much more robust compared to the 5/16. The T50 head was not wearing down after driving them into the timbers. I am predrilling 1/4" pilot holes. Not that these screws could not pull themselves all the way in, but to attempt to keep the timbers from cracking anymore that they were.