CFS Fastener Selection & Application 2

Question 1

Which fastener type is best suited for joining two thin sheet metal panels where access is only available from one side?

Accepted Answer

Blind rivet (pop rivet)

Answer

Blind rivets are designed for one-sided access applications where the back of the joint is inaccessible.

Question 2

A fastener is needed to connect wood to masonry in an outdoor environment. Which option is most appropriate?

Accepted Answer

Hot-dip galvanized lag screw

Answer

Hot-dip galvanized fasteners provide superior corrosion protection for outdoor wood-to-masonry connections.

Question 3

When selecting a fastener for a joint subject to significant vibration, which feature is most important?

Accepted Answer

Locking capability

Answer

Vibration loosening is the primary concern, so locking features such as nylon inserts, serrated flanges, or lock washers are critical.

Question 4

Which thread form is standard for general-purpose fasteners in the United States?

Accepted Answer

Unified National (UN)

Answer

The Unified National thread system is the US standard for general-purpose fasteners, encompassing UNC, UNF, and UNEF series.

Question 5

A bolt is specified as 1/2-13 UNC Grade 5. What does '13' represent?

Accepted Answer

Threads per inch

Answer

In the designation 1/2-13, '13' is the number of threads per inch (TPI) for that diameter.

(CFS) Certified Fastener Specialist Practice Test