CPI Fasteners, Anchors & Hardware 3

Question 1

What is the standard practice for minimum embedment depth when installing a wedge anchor into concrete?

Accepted Answer

At least the length specified by the manufacturer, typically 2.5 to 4 times the anchor diameter

Answer

Manufacturers specify minimum embedment depths (typically 2.5–4× the anchor diameter) to ensure the expansion mechanism develops full bearing against undisturbed concrete.

Question 2

A Grade 5 SAE bolt has head markings of how many radial lines?

Accepted Answer

3 radial lines

Answer

SAE Grade 5 bolts are identified by 3 radial lines on the bolt head, indicating medium-strength carbon steel with a tensile strength of approximately 120,000 psi.

Question 3

Which anchor is most appropriate for suspending mechanical systems from a poured concrete ceiling?

Accepted Answer

Drop-in anchor

Answer

Drop-in anchors are installed flush into a drilled concrete hole and internally expand when a setting tool is driven in, making them ideal for overhead concrete suspension applications.

Question 4

What effect does overtightening a threaded fastener beyond its proof load have?

Accepted Answer

It causes permanent elongation (yielding) that reduces clamping force and can lead to bolt failure

Answer

Overtightening past the proof load yields the bolt, permanently stretching it; the reduced cross-section weakens the fastener and the reduced spring-back lowers actual clamping force.

Question 5

In drywall construction, which fastener type is specifically designed to hold in the gypsum core rather than relying on the paper facing?

Accepted Answer

EZ Ancor or self-drilling drywall anchor

Answer

Self-drilling drywall anchors (e.g., EZ Ancor) thread into and expand within the gypsum core, distributing load beyond just the paper facing and providing higher pull-out resistance.

(CPI) Certified Professional Installer Practice Test

(CPI) Certified Professional Installer Practice Test

CPI Fasteners, Anchors & Hardware 3