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359
0
500
50
100
RONSTAN
Brass Body
Rig Load (lbf)
Adjustment Torque (lbf.in)
Brand
S
Bronze Body
Brand
H
Bronze Body
Brand
J
Bronze Body
St/St Body
1000
1500
2000
Torque Comparison for 1/4" Turnbuckles
OPEN BODY TURNBUCKLES
Ultimate Quality, Superior Adjustment Performance
Ronstan open body turnbuckles are made from polished chrome plated high grade brass bodies with grade 316 stainless steel end fittings.
This combination of materials not only avoids the risk of excessive thread wear or seizure under load, but also provides the considerable
advantage of easier adjustment.
As shown on the accompanying graph, for a given level of torque, up to
47% more tension can be achieved with the Ronstan brass body turnbuckle
than with competitors bronze body turnbuckles, or up to 71% more than an
equivalent stainless steel body turnbuckle. Conversely, for a given required
rig tension the torque required to adjust a competitors bronze or stainless
steel body turnbuckle is up to 40% or 75% more respectively than that of the
Ronstan brass body turnbuckle.
After tensioning, cross-drilled ends in the threaded terminals enable the use of
split-pins to lock and secure the adjustment. For easy thread identification an
etched “R” identifies the right-hand threaded end of the body.
As with all Ronstan turnbuckles, toggles are designed with full universal
movement for easy installation and connection and allow the assembled
cable to move where the structure is subject to wind loads or vibration.
Fine, Rolled Threads
Ronstan rigging fittings have ‘rolled’ 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
up and down the threads. Threads are UNF (Unified National Fine), shor t
pitch threads for fine adjustment and reduced adjustment effor t.
Roll Swage Integrity
Swage fittings suit ‘roll swaging’ in Wireteknik
®
type 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.
Termination Options
A full range of terminal fittings complements the turnbuckles to permit assembly of finished rigging elements
to suit vir tually any application. Details of eye swage terminals and fork swage terminals can be found on
our website, at www.ronstan.com, and in our Ronstan Marine Catalogue RPM101.
