How are bolts specified?

A bolt’s size is classified based on a number of dimensions, namely the bolt’s diameter, length of shank, thread pitch, grade, thread length and head size. Bolts can me specified in metric using millimeters, but the standard, internationally-recognized descriptions of bolt sizes are in inches.

How do you read a nut size?

Unified screw diameters are measured in inches — lowest to highest as 0 to 10. Measurements equal 0.060″ + 0.013″ x measured diameter. For example: 4-30 x . 10 has a major diameter of 0.112″.

What size is M10?

Size Clearance Hole Tapping Drill (fine pitch)
M8 9 7 mm
M10 11 9.0 or 8.75 mm
M12 14 10.5 mm
M16 18 16.5 mm

What are the bolt standards?

Bolts Dimension Standards

Description Standard Measurement System
Square & Hex Head Bolts ANSI/ASME B18.2.1 Inch Series
Hex Head Bolts ANSI/ASME B18.2.3.5M Metric
Heavy Hex Bolts ANSI/ASME B18.2.3.6M Metric
Heavy Hex Structural Bolts ANSI/ASME B18.2.3.7M Metric

How do I choose nuts for bolts?

Match the threading of a nut to the bolt.

  1. Coarse-threaded nuts and bolts are the most common and have more space between the threads. They’ll be labeled with a higher thread pitch.
  2. Fine-threaded nuts and bolts with lower thread pitches have smaller gaps between the threads, giving them a tight, strong hold.

What are the strongest bolts made?

Grade 9 structural bolts, also known as grade 9 hex cap screws, are one the strongest structural bolts that can be used today. While the typical grade 8 bolt has a tensile strength of 150,000 PSI, a grade 9 bolt has a tensile strength of 180,000PSI.