A complete range of high quality ring-locked studs, ring-locked inserts and various other fittings, inserts and studs designed for a variety of high specification applications to meet individual customer requirements. 

Rosan fasteners comprise ring locked inserts and studs with superior torsional resistance in hard and soft parent materials. The internal serration of the lockring engages with a mating serration on the fastener. Upon installation, the lockring’s external serration is driven into the parent material preventing any rotational movement.

Ring Locked inserts and studs come standard with an oversized pitch diameter on the thread which mates with the parent material. The result is a slight interference fit that is especially advantageous in high vibration and/or fatigue environments.

Ring Locked inserts are available with internal threads that are either free-running, or come with locking devices such as deformed threads, Vespel™ insert, or beam lock.

Ring Locked products are easy to install. Standard drills, taps and gages are used in combination withinstallation and removal tools.

Both inserts and studs come in a variety of materials including 303, A286, and 17-4 PH Corrosion Resistant Steels along with Inconel 718 Nickel-Chromium Alloy, 6Al-4V Titanium, and 4130 Alloy Steel. Lockring materials consist of 303 and A286 Corrosion Resistant Steels along with Inconel 718

Variations of the standard insert design include blind, hydraulic, solid and captive lockring. Stud variations include size-on-size, pin types, hydraulic, terminal, full shank, and reduced-shank nut ends.

A complete line of unified and metric products is available, along with oversize replacements for repair of damaged parent material. The Ring Locked products are covered by “AS”, “DIN”, “DOD”, “LN”, and “MS” standards.

Typical Ring Locked applications include fixed and rotary-wing aircraft, engines, gearboxes, tracked vehicles, and accessory housings.

Manufactured by Howmet, and distributed throughout Europe by the Howmet Fastening Systems Industrial Telford facility.

For more information, or to request pricing for Rosan specialty fasteners, please contact us by email at enquiries@hfsindustrial.com