Fasteners, Anchors & Hardware Flashcards
7 cards from real CPI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Fasteners, Anchors & Hardware flashcards as text
What is the purpose of a lock washer used with a bolt and nut assembly?
Answer: To prevent the nut from loosening due to vibration
Lock washers (split-ring or toothed) bite into both the nut and the mating surface to resist rotation and prevent the assembly from loosening under vibration or dynamic loads.
A chemical (adhesive) anchor offers which primary advantage over a mechanical expansion anchor in cracked concrete?
Answer: Chemical anchors bond to the concrete and perform reliably in cracked concrete conditions
Chemical anchors fill and bond within the drilled hole, making them effective in cracked concrete where mechanical expansion anchors can lose clamping force as cracks widen.
When selecting fasteners to connect aluminum components, which material should be avoided to prevent galvanic corrosion?
Answer: Zinc-coated steel
Zinc-coated (galvanized) steel and plain steel fasteners are galvanically incompatible with aluminum in wet environments, accelerating corrosion; stainless 316 or aluminum fasteners are preferred.
What does the 'pullout strength' of an anchor refer to?
Answer: The maximum tensile force the anchor can resist before being pulled out of the base material
Pullout strength (tensile capacity) is the maximum axial load that can be applied along the anchor's axis before it is extracted from the base material.
Which type of rivet is used when only one side of the workpiece is accessible during installation?
Answer: Blind (pop) rivet
Blind (pop) rivets are specifically designed for one-sided access; the mandrel is pulled to expand the tail end without requiring access to the back of the material.
The proof load of a bolt is defined as:
Answer: The load a bolt can sustain without permanent deformation, used as the installation target
Proof load is approximately 90–93% of yield strength and represents the maximum axial load a bolt can sustain without any permanent set; it is the basis for tightening specifications.
When installing masonry screws (e.g., Tapcon) into concrete, what type of drill bit must be used?
Answer: Carbide-tipped masonry bit
Carbide-tipped masonry bits are required to drill into concrete because carbide can withstand the abrasive hardness of cured concrete without dulling rapidly.