Product Summary

Longze Heavy-Duty Turnbuckles are the industry's choice for precision tensioning and adjusting the length of wire ropes, tie rods, and guy wires. Manufactured in Yongnian, China, our turnbuckles

are available in both forged and cast options, featuring elongated bodies for maximum take-up. Whether you are stabilizing a transmission tower or securing maritime cargo, Longze turnbuckles provide

the mechanical reliability and safety factors required for heavy-lift rigging.

• ✔ Multi-Configuration Versatility: Available in Hook & Eye, Eye & Eye, and Jaw & Jaw combinations to suit any terminal fitting.

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• ✔ Superior Corrosion Protection: Heavy hot-dip galvanizing exceeds ASTM A153 requirements, ensuring decades of rust-free service in coastal areas.

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• ✔ Safety & Reliability: Forged bodies provide higher fatigue resistance compared to standard cast alternatives, preventing sudden failure under cyclic loads.

• Standards: ASTM F1145 (formerly FF-T-791), DIN 1480, BS 4429.

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• Diameter Range: M6 to M48 | 1/4" - 2-3/4".

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• Take-up Length: 100mm to 600mm (Custom lengths available).

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• Material Grade: High Tensile Carbon Steel | Stainless Steel 304 & 316.

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• Surface Finish: Hot Dip Galvanized (HDG), Zinc Plated, Polished (Stainless).

Mechanical Properties & Material Standards

• Matching the steel grade to the structural requirements of the transmission line.

• Material Grade	Tensile Strength	Yield Strength	Safety Factor	Environmental Rating
  Forged Carbon Steel	430 - 580 MPa	250 MPa	5:1	Heavy Industrial
  Alloy Steel	800 - 1000 MPa	640 MPa	5:1	Mining / Heavy Rigging
  Stainless Steel 316	500 - 700 MPa	210 MPa	4:1	Marine / Coastal

Standard Cross Arm Dimensions

• Common angle steel configurations for standard utility pole mounting.

• Thread Size (D)	Body Length	Min. Take-Up	WLL (Metric Tons)	Proof Load (kN)
  1/2" (M12)	150 - 230 mm	110 mm	0.68 - 1.0 Ton	13 - 15 kN
  5/8" (M16)	230 - 300 mm	180 mm	1.00 - 1.5 Ton	22 - 25 kN
  3/4" (M20)	300 - 450 mm	230 mm	2.30 - 3.2 Ton	45 - 50 kN
  1" (M24)	450 - 600 mm	300 mm	4.50 - 5.5 Ton	90 - 100 kN

Galvanizing & Corrosion Resistance

• Ensuring 30+ years of service life in corrosive environments.

• Surface Treatment	Coating Thickness	Salt Spray Test	متانة	Best Application
  Zinc Plated	8 - 12 μm	72 - 120 Hours	Moderate	Indoor / Temporary
  Hot Dip Galv.	≥ 86 μm	500 - 800 Hours	Maximum	Transmission Towers
  SS316 Polished	N/A	1000+ Hours	Extreme	Marine / Chemical

Avoid Pitfalls:

• Thread Jamming & Galling: We prevent "thread seizing" in hot-dip galvanized turnbuckles by precision-tapping the body after the galvanizing bath, followed by a protective lubricant coating for smooth adjustment.

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• Weld Integrity: For DIN 1480 open-body turnbuckles, we utilize high-penetration welding on the eye/hook ends to ensure the joint is stronger than the threaded rod itself.

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• Over-Tensioning Safety: Never exceed the Working Load Limit (WLL). Longze turnbuckles are marked with batch codes for full traceability, allowing site managers to verify load ratings instantly.

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Perfect Fit Assembly:

• Lock-Nut Options: We can supply every turnbuckle with matched Hex Jam Nuts to prevent self-loosening caused by wind vibration on guy wires.

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• End Fitting Choices: ملكنا Jaw & Jaw models feature high-strength pins and cotter keys for a permanent, tamper-proof connection to mast plates.

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Quality Control & Logistics:

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• ISO 9001 Certified: 5-step QC including 200% Proof Load testing, ultrasonic testing for internal voids in forged bodies, and thread gauge verification.

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• Sea-Worthy Packaging: Bodies and end fittings are protected with moisture-proof wrap, bundled in heavy-duty crates, and secured with steel strapping for maritime export.

• Q: Do you offer long-reach turnbuckles for specific guy-wire projects? A: Yes, we can manufacture custom bodies with extended take-up lengths up to 900mm for specialized structural tensioning.

• Q: Can I mix fittings, such as a Jaw on one end and an Eye on the other? A: Absolutely. We offer "Jaw & Eye" as a standard configuration to provide flexibility for various attachment points.