Factory & Quality

The Nantong plant covers 33,536 m² and runs the whole sequence: wire drawing, strand twisting, rope closing. Sixty-five major machines. Nothing goes out to a subcontractor.

Every stage sits under a certified management system rather than an internal standard the company wrote for itself. Certificate numbers and dates are below.

Facility & Quality at a Glance

Production area	33,536 m²
Major equipment	65 machines across wire drawing, strand twisting, and rope closing
Standing inventory	Approximately 4,000 tons maintained year round
Quality certification	ISO 9001:2015, Certificate No. 18122Q11736R1M, valid through January 16, 2028
Environmental certification	ISO 14001:2015, Certificate No. 18122E20706R1S, valid through September 29, 2028
Energy performance	55.94 kgce per ton of product (2025 audit), down from 56.11 kgce/ton in 2024

Production

Three stages, 65 machines, including servo direct-drive straight-line drawing machines and planetary stranding machines.

There is also an independent R&D division with its own test and fatigue-qualification equipment, including torque and rotation testing gear built in-house for verifying rotation-resistant constructions before they ship.

Around 4,000 tons of finished rope sits in stock year round, which is why standard catalog constructions usually dispatch without waiting for a production slot.

Quality management

Every rope moves through six stages:

Quality planning and standards
Incoming material inspection
In-process inspection, with first-article confirmation and operator self-checks
Final and outgoing inspection before shipment
Material Review Board disposition for anything nonconforming
Continuous improvement through internal audit and management review

All of it under ISO 9001:2015 (GB/T 19001-2016 equivalent, certificate no. 18122Q11736R1M), first issued 17 January 2022, renewed 13 January 2025, valid to 16 January 2028.

Environmental and Energy

ISO 14001:2015, certificate no. 18122E20706R1S, valid to 29 September 2028.

ISO 50001:2018, certificate no. 21125En10013R0S, valid to 9 October 2028. Audited consumption of 56.11 kgce per ton across 2024, improving to 55.94 kgce per ton for the January to August 2025 period.

Health and safety

ISO 45001:2018, certificate no. 18122S10569R1S, valid to 29 September 2028, covering safety management in steel wire rope production at Nantong.

Testing and Traceability

Every rope is tensile tested against its declared minimum breaking force before it ships. Rotation-resistant products go through an additional torque and rotation check on Tongjiang's own equipment.

For marine work, the CCS Certificate of Works Approval (no. JS24PWA00203_01, valid to 17 December 2029) covers single-layer rope from 10 mm to 80 mm and rotation-resistant rope from 10 mm to 52 mm, at grades 1570 to 2160 N/mm².

Test reports, mill certificates and product quality certification documents are available for your procurement records. Most buyers ask for them, and it is easier if you tell us at order stage rather than after shipment.

Frequently asked questions

The Nantong facility covers 33,536 square meters and runs three core production stages (wire drawing, strand twisting, rope closing) across 65 major pieces of equipment. Tongjiang also maintains roughly 4,000 tons of finished-goods inventory year round to support faster dispatch on standard catalog constructions.

Four current CICC-issued certifications: ISO 9001:2015 (Quality, valid through January 16, 2028), ISO 14001:2015 (Environmental, valid through September 29, 2028), ISO 45001:2018 (Occupational Health & Safety, valid through September 29, 2028), and ISO 50001:2018 (Energy, valid through October 9, 2028). The factory also holds a China Classification Society works approval for marine-use wire rope, valid through December 17, 2029.

Every rope is tensile tested against its declared minimum guaranteed breaking force before shipment. Rotation-resistant constructions go through an additional torque and rotation verification procedure on the company's own testing equipment. Any nonconforming product is isolated and reviewed through a formal Material Review Board process rather than shipped and dealt with later.

Under ISO 50001:2018 certification, Tongjiang's audited energy performance shows comprehensive energy consumption per unit of product falling from 56.11 kgce per ton in 2024 to 55.94 kgce per ton in the January to August 2025 audit period, a measured reduction rather than a stated goal.

Nonconforming product is identified, isolated, and reviewed through a formal Material Review Board process, with disposition as rework, scrap, or a documented special release. The root cause is traced and fed into corrective and preventive action, with internal audits and management review checking that the fix holds over time.