What size hexagonal (hex) cap is found on slack adjusters with square adjusting bolts?
- 1 inch
- 3/4 inch ✓
- 2/3 inch
- 1/2 inch
Answer: B. 3/4 inch
The hex cap on slack adjusters with square adjusting bolts is 3/4 inch.
Why this is the answer
The handbook describes slack adjusters that have a square adjusting bolt at the bottom of the body. For those units, it says the hexagonal cap on the slack adjuster body measures 3/4 inch. That cap covers the spring and pawl you have to disengage (or remove) before you can turn the adjusting bolt, so knowing the right size matters when you go to work on that type of slack adjuster.
Why the other answers are wrong
- A. 1 inch — The handbook gives the hex cap size as 3/4 inch, not 1 inch.
- C. 2/3 inch — No 2/3 inch size appears in the handbook; the stated cap size is 3/4 inch.
- D. 1/2 inch — 1/2 inch does not match the handbook's cap size — the handbook mentions a 1/2 turn of the adjusting bolt, which is a different thing.
Remember it
Square bolt at the bottom means a covered unit, and the cover you pry or remove is the 3/4 inch hex cap.