About Zhejiang Jiayue Machinery Manufacturing Co., Ltd. - Screws Supplier in China

Zhejiang Jiayue Machinery Manufacturing Co., Ltd. is located in China and lists twelve active products across several mechanical categories. The catalogue includes various screw and barrel assemblies for injection molding machines, specialised rubber screws, barrier and nitrided screws for plastic extrusion, and a tungsten carbide screw with a WC insert on a hardened steel body. The product titles reference brands such as Haitian and Yizumi and cover both single‑screw and multi‑screw configurations. The tungsten carbide item is classified under HS code 8477.90. The supplier also mentions packaging drums and barrels among its broader categories, though specific items are not detailed in the provided list.

The remaining entries focus on components for rubber and plastic processing equipment, including a rubber screw for rubber machines and a barrier screw for extrusion lines. Several items are described as alloy or nitrided screws, indicating surface‑treatment processes used to improve wear resistance. The catalogue does not provide quantitative specifications such as screw diameter, L/D ratio, or material grades beyond the tungsten carbide description. Overall, the product set reflects a focus on machinery parts for the injection molding and extrusion sectors.

Product Range and Specialties of Zhejiang Jiayue Machinery Manufacturing Co., Ltd.

The listed screw and barrel products are typical of injection‑molding machine components. In the industry, screws are usually made from hardened tool steel (for example H13 or P20) with L/D ratios between 20 and 30, tolerances of ±0.02 mm, and surface treatments such as nitriding or alloying to increase wear resistance. Barrier screws for extrusion are designed with high melt‑compression ratios (often 2.5 : 1 to 3 : 1) and may incorporate wear‑resistant coatings. Tungsten carbide inserts, like the WC‑on‑steel screw in the catalogue, are employed where extreme abrasion resistance is required and are commonly supplied under HS code 8477.90.

Rubber‑processing screws are generally fabricated from heat‑resistant alloy steel and may feature nitrided surfaces with hardness above 600 HV to withstand continuous friction. Nitrided screws for injection moulding are often specified with a surface hardness of 55‑60 HRC and are inspected for dimensional stability after heat treatment. Buyers typically request material certificates that state the exact steel grade (e.g., 1.2367 or 1.2379) and the results of hardness or wear‑resistance tests. These specifications help align the supplier’s offerings with standard industry requirements for durability and performance.

Trade and Export Information - Zhejiang Jiayue Machinery Manufacturing Co., Ltd.

China is a leading exporter of injection‑moulding and extrusion machine parts, with primary destinations in Southeast Asia, Europe and North America. Products such as screws, barrels and specialised machine components fall under HS chapter 84 (machinery parts), with the tungsten carbide screw specifically classified under HS 8477.90. Importers usually request compliance with ISO 9001 quality management systems, CE marking for equipment sold in the EU, and RoHS conformity for any electronic‑related accessories. Shipping is commonly arranged in 20‑ft or 40‑ft containers, packed in wooden crates or on pallets, using Incoterms like FOB Shanghai or CIF Hamburg. Export documentation typically includes a commercial invoice, packing list, certificate of origin and, where applicable, a material safety data sheet for tungsten carbide parts.

The Chinese export environment for machine‑tool components emphasizes strict customs verification of HS codes and material declarations. Buyers often require pre‑shipment inspection reports (e.g., SGS or Bureau Veritas) to confirm that dimensional and material specifications meet the cited standards. For tungsten‑carbide inserts, additional testing such as X‑ray fluorescence (XRF) for composition and Rockwell hardness testing is standard practice before clearance at the destination port.

Sourcing from Zhejiang Jiayue Machinery Manufacturing Co., Ltd. - Buyer Guidance

When sourcing screws or barrels from this supplier, request a detailed material certificate that identifies the steel grade, heat‑treatment condition and any surface‑treatment (nitriding, coating) applied. Ask for dimensional drawings showing screw diameter, L/D ratio, clearance tolerances and barrel length, together with a third‑party inspection report confirming compliance with the stated dimensions. For the tungsten carbide screw, obtain a composition analysis, wear‑resistance test results and a certification that the product complies with the HS 8477.90 classification requirements.

Verify packaging specifications - typically wooden crates with internal bracing or bulk bags for larger barrels - and confirm that the supplier can provide a phytosanitary certificate or MSDS where required. Typical lead times for custom‑machined screws range from four to eight weeks, with minimum order quantities often set at one complete screw‑and‑barrel assembly per model. Ensure that the supplier can issue ISO 9001 compliance documentation or other relevant quality‑system certificates before finalising the contract.

What types of screw and barrel assemblies does Zhejiang Jiayue list in its catalogue?

The catalogue includes single‑screw and barrel units for Haitian and Yizumi injection‑moulding machines, alloy‑treated screws, nitrided screws, barrier screws for extrusion, rubber screws for rubber machines, and a tungsten carbide screw with a WC insert on a hardened steel body.

Which HS code applies to the tungsten carbide screw product?

The tungsten carbide screw with a WC insert is classified under HS code 8477.90, which covers parts and accessories of machines for working metal or other materials.

What material is used for the tungsten carbide screw?

The product is described as a tungsten carbide (WC) insert mounted on a hardened steel body.

What surface treatments are mentioned for the supplier’s screws?

The catalogue references nitrided screws and alloy‑treated screws, both of which are common surface‑hardening processes to improve wear resistance in moulding applications.

Which certifications should a buyer request for these machine parts?

Buyers should request a material certificate, heat‑treatment report, and evidence of ISO 9001 quality‑management compliance; for EU shipments, CE marking and RoHS compliance are also typical requirements.

What are the typical packaging and shipping methods for these components?

Components are usually packed in wooden crates or on pallets, suitable for 20‑ft or 40‑ft containers, and shipped under Incoterms such as FOB Shanghai or CIF to the buyer’s destination port.

What documentation is needed for customs clearance of the tungsten carbide screw?

Customs clearance generally requires a commercial invoice, packing list, certificate of origin, HS code declaration (8477.90) and, for the carbide insert, a material safety data sheet or composition certificate.

What lead time and minimum order quantity can a buyer expect?

Typical lead times for custom‑machined screws are four to eight weeks, and the minimum order quantity is often one complete screw‑and‑barrel set per model, unless the buyer negotiates larger batch production.