Determining the Weight of 3″ Deck Screws

A couple of days ago I mentioned I was trying to figure out the weight of 3″ deck screws I needed to purchase to complete my experiment site construction projects. I need approximately 1200 screws, but since they are sold by weight I had no idea how to go about estimating what quantity to buy.

After conducting some online research I decided that 75-85  3″ deck screws per pound was a reasonable estimate. This means I will need 16lbs of screws. The deck screws I was looking at came in 1lb, 5lbs, or 25lbs packaging. Buying three 5lbs packages and one 1lb package worked out to be almost the identical price as the 25lbs pail.

So I super sized it. Early this morning I bought 25lbs of 3″ Grip Rite Primeguard  Ten™ screws at Home Depot.

3" Deck Screws

Then I went to my lab, busted out the scales, and proceeded to find out how many screws I had purchased.

After multiple random samples I found that there were 77 screws per pound. Every sample would be just shy of a full pound with 77 screws, yet go over with the addition of one more screw. The mean screw weight was 5.85 grams (I was recording my data in grams, so I have to convert the measure to determine the screws/pound).

A rather average 5.8464 gram 3" deck screw.

This means I have approximately 1938 screws in the 25lbs pail.

So if you’re purchasing 3″Grip Rite Primeguard  Ten™ screws here is a breakdown of what you could expect the quantity of screws to be in the three common package sizes:

1lb = 77 screws

5lbs = 388 screws

25lbs = 1938 screws

I learned something new today. Now the next time 3″ deck screws come up in conversation I’ll have something to say.


Filed under General

5 responses to “Determining the Weight of 3″ Deck Screws

  1. Mary Ostrem

    Oddly enough, this is exactly what I needed to know for my own project, right down to the count of 1200!

  2. Grip rite catalogue says 76/pound but the picture was not of a deck screw so go with the 77 stated here. Thanks for the info, you would think that hardware stores would have this info at the tip of their fingers.

  3. Justin

    Sir, thank you for figuring the weight of a 3 inch deck screw. I needed to know the weight to determine how many screws I need to add to the inside of my tennis racket handle two help manipulate the racquets balance.
    Best regards,

  4. Anonymous

    Exactly what I needed. Thank you.

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