OEM & Custom Orders

Non-standard specifications are routine work here, not a favour. There is a defined intake process, a naming convention that removes ambiguity, and a technical team that reviews the spec before anything reaches the factory floor.

This page covers what can be changed, how a rope gets built from your own drawing, and what the sales team needs in order to quote. Order terms like minimum quantity and payment are on Export & Logistics.

Customization at a Glance

Customizable parameters	Construction, diameter, core type, coating, lay type and direction, length, marking
Diameter range	6mm to 80mm; larger available for mining and oil-drilling applications
Naming convention example	TG 40mm 6x36WS IWRC 1770 U sZ
Drawing-based orders	Guy wire and other application-specific rope built from buyer-supplied engineering drawings
Order process	Structured technical intake checklist completed before production begins

What you can change

Seven parameters: construction, diameter, core type (fiber, steel, or plastic-injected steel), surface coating (bright or galvanized), lay type (regular or Lang's), lay direction (left or right), length, and marking.

Diameters run 6 mm to 80 mm across the general range, with larger sizes available for mining and oil-drilling work on request.

Most custom orders are less exotic than the word suggests. Usually it is a standard construction with one parameter changed: a plastic-injected core instead of a plain steel one, galvanized instead of bright, a non-standard length, or specific marking for a fleet. Several of Tongjiang's best-selling products are exactly that, a catalog construction adapted once for a customer and then kept.

Rope from your drawing

For guy wire and other application-specific rope, Tongjiang manufactures from the buyer's own engineering drawing rather than only from its construction list. You specify the design, the factory builds to it.

Guy wire is the most common case, used on crawler cranes, tower cranes and truck-mounted cranes where the anchoring requirement belongs to the machine and the site rather than to a catalog.

The naming convention

Products follow a fixed code. For example:

TG 40mm 6x36WS IWRC 1770 U sZ

Brand, diameter, construction, core type, wire grade, surface finish, lay direction, in that order. Use the same structure when you specify a custom order and there is no room for either side to misread what was agreed.

What we need to quote

Every order, standard or custom, goes through a technical intake before production. It covers application, length and tolerance, nominal diameter, construction, grade or brand, core type, wire surface coating, lay type, lay direction, minimum breaking force, end finish, packaging, marking, and any third-party certification you need for the destination.

It reads like a lot. In practice it is one conversation, and it is the reason custom orders arrive matching what was ordered.

How a custom order runs

You complete the intake. The technical team reviews the specification and quotes.

Once you confirm, a deposit (typically 30% by telegraphic transfer) puts the order into the production schedule. Full payment terms are on Export & Logistics.

Production is scheduled against the factory's current load rather than a published lead time, because custom specifications are not sitting in stock the way catalog constructions are. When the rope is made it goes through the same tensile test as everything else, plus torque and rotation verification if it is a rotation-resistant construction. Factory & Quality covers that process.

Frequently asked questions

Construction, diameter, core type, surface coating, lay type, lay direction, length, and marking can all be customized. Diameters from 6mm to 80mm are standard, with larger sizes available for mining and oil-drilling applications.

Yes, for guy wire and other application-specific rope. The buyer supplies the design requirements and Tongjiang manufactures to that specification, which is common for applications with no standard catalog equivalent.

Tongjiang's standard 1,000-meter minimum order quantity applies to most custom specifications as well as standard catalog orders. Buyers considering a smaller custom run should confirm feasibility with the sales team directly, since requirements vary by construction and diameter.

Application, length and tolerance, nominal diameter, construction, grade, core type, wire surface coating, lay type and direction, minimum breaking force, end-finish, packaging and marking requirements, and any third-party certification requirement such as LR, DNV, or ABS. Providing this upfront speeds up the quoting process.

A code such as TG 40mm 6x36WS IWRC 1770 U sZ encodes brand, diameter, construction, core type, minimum breaking grade, surface finish, and lay direction in a fixed order. Buyers can use the same structure when specifying a custom order to avoid ambiguity about what is being requested.

A standard catalog order draws from a construction Tongjiang already manufactures and often holds in inventory, so it can move faster. A custom OEM order requires the full technical intake checklist before production is scheduled, since the specification, whether a non-standard core, coating, or a rope built from a buyer's own drawing, has to be confirmed before manufacturing begins rather than pulled from stock.

Often it is a standard base construction with one parameter changed for the application: EPIWRC is a plastic-injected independent steel core. A polymer layer sits between the outer strands and the core, spreading internal pressure and holding lubricant in the rope. The benefit is service life under multi-layer spooling and high cycle counts, not corrosion resistance. Corrosion is handled by galvanizing. PWRC is a plastic-covered wire rope core. The plastic is inside the rope around the core, not a coating over the outside of the finished rope. Several of Tongjiang's bestselling products are exactly this kind of adapted specification rather than an unusual one-off design.