Calibrated Turnbuckle Body & Lock Nut, 3/8" Thread

Rolled UNF Threads


Laser etched calibrations allow accurate, repeatable setting of rig tension.

Sleek modern profile.

Easier to adjust than conventional turnbuckles due to fine thread and single end adjustment.

Threads are UNF (Unified National Fine), short pitch threads for fine adjustment and reduced adjustment effort.

Easily adjusted - by turning the unique adjustment nut.

Lock nut included to secure desired length.

Use of dissimilar but compatible metals avoids the risk of thread seizure.

Toggle end provides full lateral articulation and connection compatability.

Threaded eye, toggle and swage terminal end options available.

Handle kit and swage grip available for 5/16" threaded models


Product Specifications
B.L. (kg)3580
Weight (g)245
Notes:* The sight hole relates to a length (L) slightly less than L MAX. If maximum length (L) is required the threaded end can be unscrewed beyond the sight hole, but the length must not exceed the specified L MAX dimension.

Product Information

Elegant Design, Exceptional Performance. From their clean lines to the use of the highest grade materials and quality finish, Ronstan Type 10 turnbuckles are engineered to deliver performance while enhancing the appearance of any yacht, or tensile project. Calibrated models. For accurate, repeatable settings of rig tension and precise adjustment, calibrated turnbuckle models are available for wire sizes up to 6mm (1/4"); thread sizes 1/4", 5/16", 3/8" UNF Type 10. Type 10 closed body turnbuckles have a sleek, modern profile with no sharp edges. They are easily adjusted by turning the unique adjustment nut, which is free to rotate within the sleeve on the turnbuckle body, and are secured with a quick turn on the locking nut. A sight hole is provided in the body to verify adequate thread engagement. With fine thread and single end adjustment, Type 10 turnbuckles are much easier to adjust than conventional turnbuckles, and the use of dissimilar but compatible metals for the threaded components avoids the risk of thread seizure. Toggles are designed with full lateral articulation for easy installation and connection compatibility. Matching Ronstan rigging fittings have rolled external threads for maximum strength and reliability - unlike cut threads, the stainless steel bar is formed up and down to create a thread with the grain remaining unbroken and flowing the full length of the thread. Threads are UNF (Unified National Fine), short pitch threads for fine adjustment and reduced adjustment effort Roll swage integrity. Matching swage fittings suit industry-standard roll swaging presses and dimensions are derived from the original 'Milspec' for maximum integrity. They are suitable for use with modern and traditional wire constructions, including 1x19, 7x19 and compact strand Wire termination options. A full range of eye, fork and toggle fittings complement the turnbuckles to permit assembly of finished rigging elements to suit virtually any application

Technical Information

Specification Details

Specification Details
A (mm)10.5
B (mm)14.4
C (mm)162
D (mm)23.2
E (mm)9.4


Grade 316 stainless steel body, lock nut, toggle and pins. Aluminium bronze adjustment nut


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