Fastener Selection & Application Flashcards
7 cards from real CFS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Fastener Selection & Application flashcards as text
What is the primary purpose of applying anti-seize compound to a fastener before installation?
Answer: To prevent galling, corrosion, and seizure for easier future removal
Anti-seize compounds lubricate the threads and contact surfaces to prevent metal-to-metal seizure, corrosion bonding, and galling, enabling easier disassembly.
A set screw is used without a nut. Where does the set screw thread engagement occur?
Answer: Directly into a tapped hole in the mating component
Set screws thread entirely into a tapped hole in the outer component and bear against (or embed into) the inner component to prevent relative motion.
Which thread engagement length is generally considered the minimum for a steel screw threading into aluminum to develop full thread strength?
Answer: 1.5 × nominal diameter
For steel fasteners in aluminum, a minimum engagement length of 1.5× the nominal bolt diameter is recommended to compensate for aluminum's lower shear strength.
A Huck bolt (lockbolt) system is preferred over a conventional nut-and-bolt system primarily because it:
Answer: Provides permanent, vibration-resistant fastening with controlled clamp load
Lockbolts are swaged in place using a pulling tool, creating a permanent, vibration-proof joint with consistent and reliable clamp load.
In structural steel applications governed by AISC, what is the difference between a 'snug-tight' and 'fully pretensioned' bolt installation?
Answer: Snug-tight is the condition when the full effort of a worker with a spud wrench brings the plies into firm contact; fully pretensioned applies a specified minimum bolt tension
Snug-tight is a minimum installation level (plies in contact) while fully pretensioned requires achieving a specified minimum clamping force per AISC/RCSC specifications.
Which SAE Grade bolt specification has a minimum tensile strength of 150,000 psi (150 ksi)?
Answer: SAE Grade 8
SAE Grade 8 bolts have a minimum tensile strength of 150 ksi (150,000 psi), making them the highest common SAE inch-series bolt grade.
When selecting a fastener for a joint that will be repeatedly assembled and disassembled, which thread form is preferred and why?
Answer: Coarse (UNC), because it is less susceptible to cross-threading and damage during repeated assembly
Coarse threads are more tolerant of damage and wear from repeated assembly cycles and are less likely to cross-thread, making them ideal for frequent disassembly.