How is your after-sales service?

For defective products, please send pictures. If the issue is ours, we will provide a free replacement without extra fees.

Can I get free samples before ordering?

Yes, free samples are available for quality checking, but you need to pay for the express shipping cost, which takes about 2-4 days.

What is your delivery time?

Our delivery time is usually 20-30 days after receiving the deposit.

How can I trust you for the first cooperation?

You can check our quality via samples, visit us face-to-face, or start orders through Alibaba Trade Assurance.

High Quality Zinc Alloy Cylindrical Lock Key Door Knob Lock

Name: High Quality Zinc Alloy Cylindrical Lock Key Door Knob Lock
Brand: Guangzhou Longterm Technology Co.,Ltd.
SKU: 924719265

Guangdong, ChinaGuangzhou Longterm Technology Co.,Ltd.

US$3.50-5.70

500 Sets

Sample price:US$5.00/set.Request sample

Product profile

Customization

Available

Material

Zinc Alloy

Type

Key Lock

Model NO.

LB-C5888SS

Style

Modern

Shape

Ball

Anti-theft Standard

Part

Key

Backset

60mm

Door Thickness Fits

35-50mm

Lock Cylinder Length

65mm

Usage

Household Door Locks

Features

Strong Corrosion Resistance, High Quality, Elegant

MOQ

500sets Each Size Each Color

Packing

Poly Bag+Inner Box+Master Carton, 1 PCS 1poly Bag

Technics

Die-Cast/Deburr/Process/Polish/QC/Plate/QC/Packing

Die-Cast/Deburr/Process/Polish/QC/Plate/

Die-Cast/Deburr/Process/Polish/QC/Plate/QC/Packing

Die Casting Machine

160 Tons, From Germany

Electroplating Layer

>=20um Each

Supply Ability

50000 Sets Daily Output

Samples

Reasonable Quantity Samples Are Free for Quality C

Transport Package

Poly Bag+Inner Box+Master Carton, 1 PCS 1poly Bag,

Specification

60mm

Trademark

Longterm

Origin

Foshan City, Guangdong Province

HS Code

8301400000

Production Capacity

50000 Sets Daily Output

Key features

Durable Zinc Alloy Material: Constructed from high-quality zinc alloy for heavy-duty performance and long-lasting durability.

Strong Corrosion Resistance: Features high-quality electroplating with a layer thickness of 20um or more for anti-rust protection.

Customizable Design Options: OEM and ODM services available since 2007 with R&D support for custom designs and samples.

Wide Door Thickness Compatibility: Fits door thicknesses ranging from 35mm to 50mm for versatile household installation.

Comprehensive Quality Control: Every process from die-casting to polishing is inspected by dedicated QC staff before packing.

High Production Capacity: Daily output of 50,000 sets supported by 160-ton German die-casting machines.

Secure Packaging Solution: Multi-layer protection including EPE bags, poly bags, hardboard boxes, and 5-layer master cartons.

Free Sample Availability: Free samples provided for quality checking, with express shipping costs covered by the buyer.

Company profile

High Repeat Buyers ChoiceYears of Export ExperienceQuality AssuranceR&D Capabilities

Guangzhou Longterm Technology Co.,Ltd.

Guangdong, China

CertifiedBusiness Type: Manufacturer/Factory & Trading Company CertifiedR&D Capacity: ODM Service Available & OEM Service Available CertifiedCustomization Options: Customization from Samples, Customization from Designs CertifiedExport Year: 13 years CertifiedNearest Port: Guangzhou PortAverage Response Time: ≤9.45h

AI-Powered supplier vetting

SummaryThe supplier is a Foshan-based hardware manufacturer with a production base exceeding 20,000 square meters, nine stated workshops, four production lines, and listed output across hinges, handles, locks, and smart locks. It supports customization from samples and designs and reports established export activity, with 71%–90% of sales from exports and 13 years of exporting. However, it reports no private-mold R&D, no 3D software design service, no SDK availability, and only one year of total R&D engineer experience. Certification management is weak because supplier-management-system certification is listed as NIL. Service controls are mixed: written procedures and records exist for service assessment, but there is no approved-supplier list and no written corrective-action or complaint-handling procedures. Financial evidence is limited to year labels without performance metrics. Customer cases are not provided.

Supplier typeThe supplier identifies itself as GUANGDONG HYH HARDWARE INDUSTRIAL Co., Ltd., operates from Foshan, China, and describes a factory with more than 20,000 square meters, nine workshops, and hardware manufacturing equipment. Its listed products and facilities support classification as a hardware manufacturer rather than a purely trading or service company.

CertificationsThe supplier-management-system certification field is explicitly listed as “NIL.” No other certification evidence is provided in the supplied slices, so the available evidence indicates a certification shortfall for this field.

After-Sales capabilityThe supplier has written procedures and followed records for assessing service capability, and it offers defined quotation and payment terms with a stated one-month lead time in both peak and off-season periods. However, it has no written corrective/preventive-action procedures or records and no written customer-complaint-handling procedures, which directly weakens after-sales governance.

R&D capabilityThe company description states that it has an R&D department for novel and popular designs, but the detailed capability data reports no private-mold R&D, no professional-technical-supplier capability, no 3D software design service, no SDK availability, and only one year of total R&D engineer experience. These explicit limitations outweigh the general statement about having an R&D department.

Production capacityThe supplier reports four production lines, nine workshops, integrated manufacturing equipment, and output covering multiple hardware categories, including 6,000,000 door hinges, 2,000,000 cabinet handles and knobs, 600,000 door-lock sets, 120,000 smart locks, and 6,000,000 cabinet hinges. Finished-product inspection instructions are uniformly followed, but the factory does not continuously reconcile quantities for each batch or production lot.

Customization capabilityThe supplier explicitly offers customization from samples and customization from designs. This directly supports product customization, although the supplier separately states that it does not provide 3D software design services and has no private molds.

Product Q&A

Q:Are you a factory or trading company?

GUANGZHOU LONGTERM HARDWARE CO., LTD. is a professional manufacturer and subsidiary of Guangdong Yunhui Industrial Limited Company (HYH group).

Q:Where is your factory located?

Our factory is located in Foshan, established in 1992, with 20,000m2 space and over 100 employees, just 30 minutes from Guangzhou CBD and Baiyun International Airport.

Q:Can you produce handles according to customer designs?

Yes, we have been offering OEM and ODM services since 2007. Please provide samples or 3D drawings for us to check the best prices.

Q:How do you handle quality control?

We have staff to check every process including die-casting, polishing, and electroplating. Each product is inspected by QC staff before packing.

Q:What is your packing method?

Products are packed with EPE bags, thick poly bags, hardboard inner boxes, and 5-layer master cartons. Pallets are available upon request with additional charge.