Answers Before You Send an RFQ

We have more than 20 years of manufacturing experience in chains and hardware. If you are evaluating a project, you can ask our team to review your requirements for welded or weldless chains, springs, wire forms, and related fittings.

Yes. You can send us your drawing and technical requirements. Our engineering team can review the part’s manufacturing feasibility, including material, dimensions, tolerances, process, and finish, before we quote or arrange production.

Yes. If you do not have a drawing, you can send us a physical sample. We can review its measurable external dimensions, material, and likely manufacturing process before quoting, but we may ask you to confirm hidden features, material grade, tolerances, and functional requirements.

Yes. We can review OEM and private-label requirements for your product, packaging, labels, and tags. Please include your branding files, packaging specifications, quantity, and destination in the RFQ so we can confirm the available options.

For planning purposes, many standard production orders may take about 30–35 days, but this is not a fixed lead time for your order. Your actual lead time depends on the product, drawing or sample, tooling, material, finish, inspection, quantity, packaging, approvals, and current schedule. Please refer to your quotation or order confirmation for the lead-time start date and planned ship date; transit time is separate.

We focus on bulk orders and generally do not accept retail orders. If you need a trial quantity, please share your product and specification so we can check the applicable MOQ.

Yes. You can request custom packaging for your order. Possible options include reels, cartons, PP bags, plastic buckets, fiber drums, metal drums, sacks, clamshell boxes, and header cards. Availability depends on your product, quantity, destination, artwork, labels, and required packing method.

A standard product sample may be available without a sample fee, although you would normally pay the shipping cost. If you need a custom sample or new tooling, a fee may apply. Please check your quotation for the exact charges, sample schedule, and whether any amount can be credited to a later production order.

You may be able to start with a small trial order for many standard products. Your MOQ for a custom item depends on its size, material, finish, tooling, and production requirements. Please send your product details and target quantity so we can confirm the applicable MOQ.

Yes. We can handle your drawings, samples, and technical information under agreed confidentiality terms. If you need an NDA or specific restrictions on use, storage, or sharing, please have the agreement signed before you send detailed information.

Yes. You can send us any drawing you have or a physical sample, together with the intended use, working conditions, and target requirements. We can review feasibility before we prepare a quotation or begin sampling.

We design and build some chain-making and wire-forming machines for selected production processes. If your product requires a special process, you can ask us to review whether the equipment, tooling, or process settings can be adapted. If you want to purchase production equipment, please ask us separately whether the required equipment is available for sale.

We ship chain products to more than 20 countries and regions, including markets in North America, Europe, Australia, and Southeast Asia. If you need delivery to a particular market, please share your destination and document requirements so we can check the current options.

Depending on your material and order requirements, a material certificate may be available. Please state the exact document you need, the required issuer, heat or batch traceability, and file format in your RFQ so we can confirm its availability, scope, cost, and when it can be provided for your order.

For an accurate quotation, please send your drawing or sample, material grade, dimensions and tolerances, finish, application, quantity, packaging, destination, required tests, and target date. If some details are not final, please identify them so we can clearly state the assumptions used in your quotation.

We can review drawings in any file format. You can send us a 2D drawing, an image, or a native 3D CAD file. Please make sure your drawing clearly shows the part number, revision, units, material, critical dimensions, tolerances, finish, and inspection notes. If any information is unclear, we will check it with you before quoting or arranging production.

Yes. You can ask us for a basic manufacturability review before sampling. The review may cover forming, tooling, joining, material, finish, tolerances, and inspection points relevant to your part. Please agree with us on the review scope, approval conditions, and final design responsibility for your project before sampling.

Please include your part number and drawing revision on every RFQ and purchase order. Before you place a repeat order, we can confirm with you the drawing revision, approved sample, material, finish, packaging, and inspection plan that will govern production.

We produce both welded and weldless chains. Single loop chain (also called lock link chain) is one of our main chain products. We also produce double loop, single and double jack, sash, plumber’s, ladder, decorative, pet, anchor, safety, elevator balancing, and welded steel chains in various grades and link shapes. These chain types are not interchangeable, so please share your application, required standard or size, material, finish, and load requirements for review.

We can supply chains made to American (ANSI), German (DIN), Australian, Japanese (JIS), and Swedish standards, and we can manufacture non-standard chain sizes for your project. Availability depends on the chain type, so please provide the exact standard designation and revision, chain type, and size for confirmation.

Depending on the chain type, you can request carbon steel, alloy steel, stainless steel, brass, copper, or aluminum. Please specify the exact material grade, required properties, and any certificate or batch-traceability requirement, because not every material is suitable or available for every chain design.

Depending on the chain type and base material, you can request polishing; electro-galvanizing or hot-dip galvanizing; copper, brass, nickel, or chrome plating; e-coating; powder coating; passivation; or another product-specific finish. Please specify your required process, coating specification, color, corrosion test method, duration, and acceptance criteria. Not every finish is suitable or available for every product and service environment.

Yes. You can request custom dimensions, material, finish, length, and packaging. Please send your drawing or physical sample and state the intended application, load requirements, applicable standard, quantity, and acceptance criteria so we can review feasibility before sampling or production.

Please start with your chainwheel brand and model or the required trade size. If you cannot provide these, send us your application details; a drawing, photo, or sample of the chainwheel; and the required wire diameter, inside link length, material, finish, continuous loop length, quantity, packaging, and working load. We can review the proposed match before quoting, but final compatibility should be checked against the approved chainwheel and chain specifications.

No. You should not use our single loop chain (lock link chain) for overhead lifting or hoisting. It is intended for manual chainwheel operation and other light-duty uses, not for lifting suspended loads. Please use the selected size only within its documented working load limit and approved application.

We produce compression, extension (tension), torsion, drawbar, and custom-shaped springs. Please tell us your required function, geometry, working conditions, and load or torque target so we can review the design before sampling.

Depending on the spring type and wire size, you can request music wire, spring steel, carbon steel, alloy steel, stainless steel, copper-based alloys, or nickel-based alloys. Please specify the exact grade, required mechanical performance, operating temperature, and corrosion resistance so we can check availability and manufacturability for your design.

Depending on your material and spring function, possible processes include shot peening, suitable plating, phosphating, powder coating, stainless-steel passivation, and black oxide. We can review the options against your base material, spring movement, service environment, and acceptance criteria because not every treatment fits every design.

Yes. We can review a custom spring from your drawing or physical sample. Please include the size, shape, material, finish, load, spring rate, torque, or other functional requirement, quantity, working conditions, and inspection criteria. Feasibility and tolerances should be confirmed in your approved drawing before production.

For an accurate review, please provide your spring type, wire diameter, coil diameter, free length, end or leg geometry, material, finish, quantity, and working conditions. Depending on the design, include the required load, spring rate, or torque at a defined working position, together with any operating temperature, required cycle life, corrosion exposure, and function-critical dimensions.

Yes. We can review your requested tolerances before sampling. Feasibility depends on the material, wire size, geometry, heat treatment, finish, and whether control is dimensional or load-based. Please mark your function-critical characteristics and record the approved tolerances in the final drawing and inspection plan before production.

We can provide quick links, R-clips or R-pins, swivels, rings, S hooks, locking pins, spring hooks, fixture hangers, snap hooks, and related wire-formed fittings. Please tell us your intended application because similar-looking fittings can have different load, locking, and safety requirements.

Depending on the fitting type and forming method, you can request carbon steel, stainless steel, zinc alloy, or aluminum. Please specify the exact grade, required strength or load, service environment, and any certificate or traceability requirement so we can check suitability and availability for your design.

Depending on your base material and part design, possible options include electroplating, e-coating, polishing, or a specifically defined oxidation process. Please state your appearance, wear, corrosion exposure, and acceptance requirements so we can review suitable options.

Yes. We can review a custom size, shape, material, and finish from your drawing or physical sample. Please include your application, intended load, quantity, applicable standard, and inspection criteria. If your fitting is safety- or load-critical, also specify the required working load limit, proof or break test, and traceability. Please do not assume a general-purpose custom fitting is suitable for lifting unless its rating and test plan are agreed.

We generally prefer T/T. Depending on your order, a letter of credit (L/C), Western Union, or PayPal may also be available. Please use your quotation or pro forma invoice to confirm the approved method, deposit and balance schedule, currency, beneficiary account, and bank charges, and verify the beneficiary details through a known Tuohai contact before you pay.

You may request EXW, FOB, CIF, or DDP, and you can ask whether DAP is available for your route. We can confirm the approved option in your quotation. Please make sure it states Incoterms® 2020, the exact named place or port, and each party’s responsibility for freight, insurance, customs clearance, duties, and taxes.

We generally accept RMB and USD. Your quotation or pro forma invoice should confirm the approved currency, beneficiary account, and exchange-rate basis for your order. If you need another currency, please ask before the quotation is issued.

Our published information refers to more than 150 chain-production machines and more than 50 wire-forming machines. If these figures affect your supplier approval or capacity plan, please request a dated breakdown by site, ownership or operating relationship, machine type, automation level, product, and the resources expected to support your order.

Our published information refers to a team of more than 50 people across engineering, sales, and other functions. If headcount is part of your supplier audit, please request a dated breakdown by site and function, including the team expected to support your order.

Our published information refers to annual capacity above 2,000 tons for chains and above 1,000 tons for springs and hardware accessories. These figures are planning references, not a commitment for your order. Please share your exact product, quantity, specification, and required schedule so we can check the current capacity and timing applicable to your project.

Depending on your destination, cargo, schedule, and Incoterms rule, possible options include sea freight, air freight, express delivery, road or container trucking, rail, and sea–rail transport. Your quotation or shipping plan should confirm the route, booking party, cost scope, handover point, and transit estimate.

Yes. You can use your own freight forwarder if this is confirmed in the shipping terms for your order. Before shipment, please provide the forwarder’s contact and booking instructions and agree the handover point, export documents, pickup and cut-off dates, local charges, and each party’s responsibilities under the selected Incoterms rule.

You can email aftersale@tuohaichain.com or contact the Tuohai representative named on your order. Please include your order number, product or lot reference, affected quantity, photos or video, measurements, inspection records, and a clear description of the issue.

If you find a product problem, please send your order number, product or lot reference, affected quantity, photos or video, measurements, and inspection records. We can then review the evidence and confirm the investigation steps with you. Any response-time target, claim deadline, repair, replacement, credit, refund, or freight responsibility will follow the applicable specification, sales contract, and approved claim policy for your order.