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Question

Difficulty: MediumScrewdrivers

When disassembling interior trim on certain vintage vehicles and travel trailers, a mechanic encounters screw fasteners with an hourglass-shaped or bowtie-shaped recess. Which type of screwdriver is designed to properly engage these fasteners?

  1. A
    Robertson screwdriver
  2. Clutch-head screwdriverAnswer
  3. C
    Torx screwdriver
  4. D
    Slotted keystone screwdriver

Answer

Clutch-head screwdriver
A clutch-head screwdriver is manufactured with an hourglass (bowtie) cross-section specifically engineered to engage clutch-head fasteners, which are commonly found in vintage automotive applications, recreational vehicles, and mobile home construction. This design provides positive engagement and resists slipping when turned.

Step-by-Step Solution

1
Analyze the fastener recess geometry described in the scenario.
The fastener head features a distinctive hourglass-shaped or bowtie-shaped recess.
Identifying the specific geometric recess is the prerequisite for selecting the matching driver tip.
2
Correlate the recess profile with standard shop screwdriver designs.
A clutch-head (also called butterfly or hourglass) screwdriver has a tip that narrows at the center and flares at the outer lobes to seat perfectly in this recess.
Using the matching drive profile ensures maximum contact area, allows proper torque transfer, and prevents rounding or camming out.

Key Concept

Screwdriver Drive Profiles and Fastener Head Identification
Estimated Time:45s
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Topics

Screwdrivers

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