Unrivalled Controlled Bolting and Joint Integrity Expertise from HTL Group. HTL Group are controlled bolting and joint integr ... ity specialists. Headquartered in the North East of England, with strategically located facilities across the UK and Australasia. HTL Group offers complete support to customers in the hire and purchase of controlled bolting, flange working, lifting solutions, and portable machine equipment. Alongside the extensive product range, the HTL Group is an Authorised Enerpac Distributor and Service Centre, providing a complete service offering with the Calibration, Repair, Servicing and Training, providing our customers with a single-source supplier. Supported by our dedication to serving our customers needs with our incomparable Customer Support, we aim to solve any challenges they face in a timely manner. read more