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Rigging Screws

Rigging Screws

Rigging Screws

Rigging screws are turnbuckles with jaw (clevis) fittings at each end instead of plain eyes. The jaws accept rigging hardware (toggles, T-terminals, swageless terminals) for clean in-line installation without intermediate connectors. The screw body adjusts tension over a wide range as the rigging is set up or re-tensioned over service life.

Also known as: Jaw Jaw Turnbuckle, Stainless Rigging Screw, Architectural Turnbuckle, Balustrade Tensioner.

Stainless A4-70 G316 with jaw & jaw end fittings. M5 x 130mm and M6 x 150mm body sizes covering balustrade, awning and small-marine cable tensioning. For larger sizes or eye-end configurations, see the Turnbuckles sub-cat.

GRADES AND MATERIALS

Stainless A4-70 G316 (marine grade): 700 MPa minimum tensile, 316-family austenitic stainless with added molybdenum (2-3%) for chloride-pitting resistance. The standard for direct saltwater exposure, ocean spray, chlorinated pool plant and food-grade processing. Largely non-magnetic - cold-formed sections may show slight residual magnetism from manufacture.

INSTALLATION AND USE

Open the body fully (unscrew the two end fittings to mid-position before installing). Connect the jaw ends to the cable hardware. Tighten the body to develop cable tension - as the body turns, both end threads pull together. Most rigging screws have a left-hand thread on one end and right-hand on the other so a single body-turn tensions both ends.

A NOTE ON GALLING

Stainless threads can gall under tension - apply a thin film of nickel-based anti-seize from the Anti-Seize range to the male thread before assembly. Tighten slowly, never with an impact driver.

SIZE AND WLL

M5 body = ~250kg WLL on the wire-rope rigging it tensions; M6 = ~400kg. The published WLL applies to a fully made-up screw with the threads engaged to the rated depth - if the body is wound out to maximum extension, WLL drops sharply.

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