What quality standards do you follow?

We follow strict ISO9001 standards for quality control in our manufacturing process.

What is the minimum order quantity?

We accept orders of all sizes, so there is no strict minimum order quantity.

What is the product standard and material?

Our hex nuts are made of steel, follow ISO standards, and are available in grades 4, 6, and 8.

Heavy Duty Black Hex Nuts

Name: Heavy Duty Black Hex Nuts
Brand: Ningbo Steel Bolt Co., Ltd
SKU: 2116884365

Zhejiang, ChinaNingbo Steel Bolt Co., Ltd

US$0.10-1.00

1,000 Pieces

Product profile

Customization

Available

Material

Steel

Standard

ISO

Model NO.

DIN934

Grade

4 6 8

System of Measurement

Metric

Product Name

Hex Nut

Measurement System

Metric

Finish

Zinc/Black Plated/HDG

Application

General Industry

Transport Package

Cartons+Plastic Bags

Specification

M20

Origin

Zhejiang, China

Production Capacity

100000 Piece/Pieces Per Month

Key features

OEM/ODM Services: Full customization available from samples, designs, or flexible requirements.

ISO9001 Quality Control: Strict quality management system ensuring high-standard fastener production.

Fast Delivery: Quick delivery for in-stock items with one-month lead time during peak season.

Customizable Packaging: Flexible packaging options tailored to specific customer needs.

Free Samples: Free samples provided for new customers (shipping charges apply).

Versatile Applications: Suitable for general industry use including bolts, nuts, and washers.

Multiple Payment Options: Accepts T/T, L/C, D/P, PayPal, and Western Union for various order sizes.

Certified Manufacturer: Gold member of Made in China with years of industry experience.

Company profile

High Repeat Buyers Choice

Ningbo Steel Bolt Co., Ltd

Zhejiang, China

CertifiedBusiness Type: Manufacturer/Factory & Trading Company CertifiedR&D Capacity: ODM Service Available & OEM Service Available CertifiedCustomization Options: Customization from Samples, Customization from Designs, etc. CertifiedExport Year: 6 Years CertifiedNearest Port: Ningbo PortAverage Response Time: ≤24h

AI-Powered supplier vetting

SummaryThe supplier is identified as a professional technical supplier and operates as a combined company involved in producing and selling fasteners, hardware products, auto parts, and oil pipeline fittings. It supports extensive product customization, including samples, designs, full customization, minor customization, and flexible customization. The supplier reports two production lines and one presence in a main export market, with an average lead time of one month in both peak and off-season periods. However, it lacks 3D software design services, SDK availability, in-stock capacity, overseas warehouses, overseas agents or branches, and offline trade-show participation. Finished products are checked by packing staff, while no written procedures or records are used for assessing service capability. The provided information does not establish certifications, financial strength, after-sales performance, or customer case history.

Supplier typeThe supplier is explicitly identified as a professional technical supplier. It is a combined company whose stated business scope includes production and sales of fasteners, hardware products, auto parts, and oil pipeline fittings, as well as related import and export activities.

R&D capabilityThe supplier is identified as having professional technical research and development capability, and it offers multiple forms of customization. However, it explicitly does not provide 3D software design services and has no available SDK, so the evidence supports technical customization but not broader digital or software innovation capability.

Production capacityThe supplier reports two production lines, one-month average lead times in both peak and off-season, and six years of exporting experience. Countervailing controls are limited: finished products are checked by packing staff, there is no continuous quantity reconciliation for each batch or production run, no outsourcing SOP, no valid manufacturing-capacity contract with related subcontractors, and no in-stock capacity.

Customization capabilityThe supplier explicitly supports customization from samples, customization from designs, full customization, minor customization, and flexible customization. This is direct evidence of broad product-design and modification capability, although 3D software design services are not available.