Practice Test Geeks(CFS) Certified Fastener Specialist Practice Test
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Metric & Imperial Conversion 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 Metric & Imperial Conversion flashcards as text

  1. What is the tensile stress area of an M12×1.75 bolt in mm²? (Use the formula: As = 0.7854 × (d - 0.9743/n)²)

    Answer: 84.3 mm²

    For M12×1.75 the standard tensile stress area is 84.3 mm² per ISO 898 tables.

  2. Convert a clamping force of 10,000 N to pound-force (lbf).

    Answer: 2,248 lbf

    1 N = 0.2248 lbf, so 10,000 N × 0.2248 = 2,248 lbf.

  3. A 3/8-16 UNC bolt has a pitch of how many millimeters?

    Answer: 1.588 mm

    Pitch = 25.4 ÷ TPI = 25.4 ÷ 16 = 1.5875 mm ≈ 1.588 mm.

  4. An engineer specifies a surface finish of 1.6 μm Ra. What is the approximate equivalent in microinches (μin)?

    Answer: 63 μin

    1 μm = 39.37 μin, so 1.6 μm × 39.37 ≈ 63 μin.

  5. A nut has a width-across-flats of 19 mm. Which standard inch wrench size is the closest fit?

    Answer: 3/4 inch (19.05 mm)

    19 mm is nearly identical to 3/4 inch (19.05 mm), making it the closest standard inch wrench.

  6. A fastener's shear strength is listed as 90,000 psi. What is this in ksi?

    Answer: 90 ksi

    1 ksi = 1,000 psi, so 90,000 psi ÷ 1,000 = 90 ksi.

  7. Convert 8.8 mm bolt grip length to the nearest 1/16 inch increment.

    Answer: 11/32 inch (8.73 mm)

    8.8 mm ÷ 25.4 = 0.346 in; the nearest 1/16-inch increment is 11/32 in (0.344 in = 8.73 mm).