🔍 Key Concepts

• Standard National Coarse (SNC/UNC) thread series for bolts • Relationship between bolt diameter and typical threads per inch (TPI) in coarse vs fine series • How fine-thread (NF/UNF) compares to coarse-thread (NC/UNC) for the same diameter

💭 Think About

• First, recall or look up the standard threads-per-inch for a 1/2 inch bolt in the coarse series, not the fine series. • Compare the answer choices to what you would expect: which values are more typical of fine threads vs coarse threads? • Eliminate any TPI values that are unusually high for a 1/2 inch coarse-thread bolt.

✅ Before You Answer

• Confirm you are using National Coarse (NC/UNC), not National Fine (NF/UNF)**. • Verify the standard TPI chart for 1/2 inch diameter bolts in the coarse series. • Check which of the listed TPIs is commonly used for general-purpose structural bolts, not precision or fine-thread fasteners.