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All answers having "Fastener" as clue:

3 Character Answers:

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PEG

PIN

ZIP



4 Character Answers:

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BOLT

CLIP

HASP

NAIL

SNAP

STUD

TACK

TIER

TNUT



5 Character Answers:

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CLAMP

CLASP

HINGE

LACER

LATCH

RIVET

SCREW

STRAP

UBOLT



6 Character Answers:

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LUGNUT

PINNER

STAPLE

ZIPPER



7 Character Answers:

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CONVENE

FIXATOR

STAPLER



8 Character Answers:

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HOOKANDI



10 Character Answers:

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HOOKANDEYE



11 Character Answers:

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SLIPPEDDISC



13 Character Answers:

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TRANSGRESSION