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.
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).
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.