How to Use Fastener Measuring Tools | Fasteners 101

[@DirectorWD40]

Could you tell me what are all of the numbers that are in the grid at the bottom where it sats INCn UNCand UNF? Thanks

[@AlbanyCountyFasteners]

I assume you are referring to the blue fastener gauge? The grid at the bottom lists off common fastener sizes in imperial and metric and their respective coarse (UNC) and fine (UNF) threads per inch / thread pitches. Most fasteners of a given size will have their thread pitch be one of those 2 numbers, with rare exceptions.

[@LEGOCAMARO]

When i order rivets the company's go by size of hole and length ex. 1/8in.x 3/8in. never seen #6x64

[@AlbanyCountyFasteners]

Rivets are measured by their diameter x grip range, like the size you gave in your comment. The numerical sizes (6-4, 6-6, 4-4, etc.) are another way to represent the diameter and grip range. Here's how those numbers work: Let's use a 6-6 as an example. The first number is the diameter in 32nds, so 6/32" which is simplified to 3/16." The second number is the grip range in 16ths, so a 6/16" which is simplified to 3/8." So putting that together, a 6-6 would be a 3/16" x 3/8" pop rivet. The pop rivet numerical system is a common way to represent pop rivet sizes, but, as you can see from the explanation above, it's easy to see why some companies may omit that sizing system, or at the very least have those numbers with the actual measurements. You can find a more detailed explanation of rivet sizing here: www.albanycountyfasteners.com/Rivet-Guide-s/1158.htm

[@ellsworthm.toohey7657]

Useless crap. Go metric, easy, any mechanic can see what diam a bolt is and the reuired spanner. On very rare occasion, one can find UNC bolt recognisable because the pitch is coarse like a wood screw. Just remove it, throw it away to avoid any future problem.

[@johnclark7957]

Erm! Umm! Erm!

[@jarisipilainen3875]

that caliber is only need. plastic stuff useless

[@AlbanyCountyFasteners]

Thank you for your comment!