What is a turnbuckle (turn buckle) used for?

A turnbuckle — also called a bottle screw or rigging screw — adjusts tension in wire rope, guy wires, bracing rods and cable assemblies. Rotating the body draws both end fittings together or apart, letting you fine-tune preload without cutting cable. Common uses include shade structures, fencing, telecom guy wires, scaffolding bracing and marine rigging.

Turn buckle 12mm vs 16mm — how do I choose?

Size refers to the body/thread diameter (M12 ≈ 12mm, M16 ≈ 16mm). Choose based on the stamped safe working load (SWL) required for your cable or rod, not just cable diameter. A 12mm turnbuckle suits lighter guy wires and signage bracing; 16mm is the go-to for heavier structural tensioning. Always match end fittings (eye-eye, jaw-jaw, hook) to your connection points and verify SWL on the body before use.

Stainless steel vs cast iron turnbuckle — which is better?

Stainless steel turnbuckles resist corrosion in coastal, marine and outdoor installations — ideal when you search for stainless steel 16mm turnbuckles for long service life. Cast iron / galvanised turnbuckles are cost-effective for general structural bracing, shade nets and temporary rigging where periodic inspection and replacement is planned. Match material to environment and duty cycle.

What is the safe working load on a turnbuckle?

SWL is stamped on the turnbuckle body or tag and must never be exceeded. It varies by body size, material and end fitting — our JIS-type and bottle-screw listings state rated capacity in kg or ton. For 12mm and 16mm body sizes, check the stamped WLL on each unit; do not guess from thread diameter alone.

Eye-eye vs jaw-jaw turnbuckle — what is the difference?

Eye-eye turnbuckles connect to shackles or wire-rope thimbles through round eyes — common on guy wires and bracing. Jaw-jaw (bottle screw) turnbuckles use clevis jaws for rod ends, turnbuckle toggles or pinned connections — popular in structural steel and heavy rigging. Pick the end type that matches your existing hardware to avoid side loading or pin mismatch.

How do I install and tension a turnbuckle safely?

Back off both end fittings so roughly half the thread is engaged, attach to fixed anchor points, then rotate the body (not the fittings) to take up slack. Tighten gradually and equally — over-tightening can gall threads or overload the SWL. Lock nuts or wire seizing may be required on vibration-prone installations. Inspect threads and pins before each use.

What is the HSN code and GST rate for turn buckles in India?

Turnbuckles and rigging screws are commonly invoiced under HSN 7318 (screws, bolts and similar articles of iron or steel) or related steel hardware codes at 18% GST, depending on exact classification. We provide GST-compliant invoices on every order — share your GSTIN for B2B procurement records.

Do you supply turn buckles in bulk from Delhi NCR?

Yes. We fulfil turnbuckle bulk orders for contractors, rigging dealers and project tenders nationwide. Share size (e.g. 12mm or 16mm), material (SS, cast iron, JIS) and quantity for a GST quote — WhatsApp or use the Enquire button on any listing below.