🔍 Key Concepts

• Determine the pitch of a 3/4-13 NF thread (how many inches per thread). • Use the illustration to see how many thread pitches are included in dimension H. • Remember that 13 threads per inch means a small distance between crests; convert this to a decimal to compare with the choices.

💭 Think About

• From the callout 3/4-13 NF, what part tells you how many threads there are per inch, and how do you turn that into the distance between adjacent crests? • Looking closely at the sketch, does dimension H span the distance of one, two, or several thread spaces? How many full pitches are shown inside H? • Once you know the pitch and how many pitches are in H, what multiplication do you perform, and which choice is closest to that result?

✅ Before You Answer

• Be sure you have converted threads per inch to pitch correctly: ( \text{Pitch} = 1 / \text{TPI} ). • Double-check how many complete thread spaces (from crest to crest or root to root) fall within dimension H on the illustration. • Confirm that your final number is in inches as a decimal and matches one of the answer choices.