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Zorluk: KolayScrewdrivers

A cross-recess screw head features sharp internal corners and a pointed center with 45∘45^\circ flutes. Which type of screwdriver is designed to fit this specific fastener without camming out?

  1. A
    Phillips screwdriver
  2. Frearson (Reed & Prince) screwdriverCevap
  3. C
    Clutch-head screwdriver
  4. D
    Cabinet-tip slotted screwdriver

Cevap

Frearson (Reed & Prince) screwdriver
The Frearson (also known as Reed & Prince) screwdriver is engineered with a sharp, pointed cross tip and true 45∘45^\circ flutes, allowing one driver size to fit multiple screw sizes while preventing slippage under high torque.

Adım Adım Çözüm

1
Analyze the fastener head geometry described in the stem.
The fastener has a cross-recess with a pointed center, sharp internal corners, and 45∘45^\circ flutes.
Identifying specific drive geometry prevents tool slippage and fastener damage.
2
Distinguish between cross-slot drive profiles.
While Phillips drivers have blunt tips and rounded internal corners, Frearson drivers come to a sharp point with straight 45∘45^\circ flutes.
Matching the driver tip to the recess profile ensures proper torque transfer and prevents cam-out.

Anahtar Kavram

Distinguishing Frearson (Reed & Prince) cross-slot screwdrivers from Phillips drivers based on tip point sharpness and flute geometry.
Tahmini Süre:40s
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