The Fastenio Blog
How-tos, comparisons and spec explainers for people who buy and install fasteners. Looking for quick reference charts? See the buying guides.
Thread & Sizing · · 4 min read
Coarse vs. Fine Thread (UNC vs. UNF): Which Should You Use?
Coarse is the right default. Here is when fine thread is worth it, with a side-by-side TPI chart.
How-To · · 4 min read
How to Measure Bolts and Screws: Diameter, Thread Pitch & Length
Three measurements identify almost any fastener. Here is exactly where to put the calipers.
Materials · · 4 min read
Stainless Steel Galling: Why Bolts Seize and How to Prevent It
Galling turns a nut and bolt into one piece of metal. Here's how to stop it before it starts.