Capped nuts are used
- prevent overtightening due to the threaded portion being restricted by the cap.
- to provide a dry torque joint.
- to stop leaks.
Explanation from PART66Online
A capped (acorn/dome) nut has a closed top that seals the thread end, so it is used to stop fluid leaking past the exposed thread and to protect the protruding bolt end. It does not provide a dry-torque joint or assure dry bolting.
C
cpster asked · 31 Jan 2014
need expanation
Community Comments (4)
R
Roman Raicu
2 Apr 2018
What kind of leaks??
J
Jordi
18 May 2020
leaks man ,leaks from hydraulics leaks from fuel etc.
M
m.dimitris
16 Apr 2021
i think it is wrong this question .! the first answer is correct
en.wikipedia.org/wiki/Acorn_nut
this link explain
en.wikipedia.org/wiki/Acorn_nut
this link explain
M
mau__17
18 Jan 2026
I dont get it, capped nuts aren't leak proof right?
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