coach screw
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English
Noun
coach screw (plural coach screws)
- (hardware) A large metal wood screw with a hexagonal head.
- Synonym: lag screw
- 1943 September and October, “Railway Construction and Operation at War Department Depots”, in Railway Magazine, page 263:
- In turnouts the special fittings are secured by coach screws. Portable air compressors with special tools for boring holes and driving the coach screws save both time and labour.