Tap Drill Quiz

1. Which is smaller…17/64 or 5/8?

17/64

Use 5/8

2. What drill bit would you use for a 5/8-11 Tap if you did not have a 35/64” drill?

17/32”

5/8”

2/3”

3/8”

3. What does BSW stand for?

British Standard Whitworth

British Straight Winding

British Strong Whitworth

British Strong Winding

4. What does UNC stand for?

Unified National Coarse

United Natural Coarse

Unity Nature Culturist

United National Coarse

5. Which of the following are types of taps?

Spiral

Bottoming

Centering

Both a and b

6. What is the preferred drill size for a 1/4-20 tapped hole?

13/64”

1/4”

1/5”

1/2”

7. What does BSF stand for?

British Standard Finish

British Standard Fine

British Strong Finish

British Strong Fine

8. What is the decimal equivalent to 9/64?

0.1406

0.9644

0.01406

0.09644

9. 3/8-18 is which type of thread?

UNF

NPT

NPTF

UNC

10. Metric thread is determined by which?

Threads per inch

Length - diameter

Mm between each thread

Threads per mm

11. What does NPT stand for?

National Pipe Taper

National Pipe Thread

Natural Pipe Tester

Natural Pipe Thread

12. How many different fine thread pitches are there for an M12 tap?

1

2

3

4