| Bit of hardware that prevents a screw from loosening |
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| Fastener to clunk discordantly (7) |
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| Block nutcase holding fastener (7) |
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| Metal fastener screwed on top of another (7) |
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| Device for keeping a bolt fastener tight (7) |
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| Metal fastener designed to stop accidental loosening |
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| Supplementary fastener (7) |
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| Security device — not luck (anag) |
The Guardian Quick |
15 Jul 2022 |
| Fastener that resists loosening |
Wall Street Journal |
25 Aug 2018 |
| Fastener that resists loosening |
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| Bar has devotee providing an extra level of security in a tight space |
Irish Times Crosaire |
03 Dec 2016 |
| It prevents loosening of hair on head |
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| Item for securing hair on head |
The Telegraph Toughie |
19 Aug 2015 |
| Sturdy fastener |
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| Special sort of fastener. |
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