Practice Test Geeks(CFS) Certified Fastener Specialist Practice Test
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Torque & Tension Specifications 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 Torque & Tension Specifications flashcards as text

  1. What is the recommended torque re-check procedure when gaskets are used in a bolted flange assembly?

    Answer: Re-torque once after ambient temperature soak to compensate for gasket creep

    Gaskets creep under sustained clamp load, so a re-torque (hot re-torque for high-temperature joints) is standard practice to restore preload.

  2. In the torque formula T = K × D × F, what does the variable D represent?

    Answer: Bolt diameter in inches or mm

    D is the nominal bolt diameter, which along with the nut factor K and desired clamp load F determines the required torque T.

  3. A torque multiplier (gearbox multiplier) is rated at 5:1. If the operator applies 40 N·m input, what is the output torque at the fastener?

    Answer: 200 N·m

    Output torque = input torque × multiplication ratio = 40 N·m × 5 = 200 N·m.

  4. Which ASME standard governs the calibration and accuracy requirements for torque wrenches used in industrial applications?

    Answer: ASME B107.300

    ASME B107.300 (formerly B107.14) defines torque wrench accuracy requirements and test procedures for industrial torque tools.

  5. When using the torque-angle method, what is measured after reaching a threshold torque?

    Answer: Additional degrees of rotation beyond the threshold

    After a snug or threshold torque is reached, additional rotation (angle) stretches the bolt a predictable amount into the target clamp load range.

  6. Hydrogen embrittlement is most likely to cause fastener failure at which stage?

    Answer: Within hours to days after installation under sustained tension

    Hydrogen diffuses to high-stress regions under sustained tensile load, causing delayed brittle fracture typically within 24–200 hours after installation.

  7. A field inspector finds that several bolts were installed with an air impact wrench without any torque verification. The best corrective action is:

    Answer: Re-torque all bolts using a calibrated torque wrench to specification

    Impact wrenches do not control torque accurately, so a calibrated re-torque is the proper corrective action to verify and establish correct preload.