ALCA Fasteners are a major supplier of large diameter bolts & nuts to the Petro-chemical, gas, oil and construction industries. With experience dating back to the 1970's ALCA has led the way with service, reliability on quality products - supplied fully certified. We carry over 2,000 tonnes of large diameter finished and semi-finished blanks and bolts in high grade materials 95% are certified to BS EN 10204.31.