What standards do you follow?

We follow DIN, ASTM/ANSI, JIS, EN, ISO, AS, and GB standards.

What is the packaging?

Standard packaging is 20-25 kg per carton, 36-48 cartons per pallet. Custom packaging with logos is available.

ASTM A325 A490 Heavy Duty Carbon Steel Structural Bolt Hex Head Bolt Black Oxide

Name: ASTM A325 A490 Heavy Duty Carbon Steel Structural Bolt Hex Head Bolt Black Oxide
Brand: Bolnut Fastener Co., Ltd
SKU: 2243472125

Jiangsu, ChinaBolnut Fastener Co., Ltd

US$0.10

1 Piece

Sample price:US$0.10/piece.Request sample

Product profile

Customization

Available

Material

Carbon Steel

Type

Hexagon Head

Model NO.

ASTM A325/ASTM A490

Connection

Common Bolt

Head Style

Hexagonal

Standard

DIN, ANSI, GB, JIS, BSW

Grade

A2-70

Application

Machinery, Chemical Industry, Environmental, Building

Finish

Zinc, Plain, Black, Hot Dipped Galvanized

MOQ

10000 Pieces

Thread

Metric

Name

Heavy Hex Structutal Bolts

Certificate

ISO9001

Transport Package

20-25kg/Carton+900kg Pallet

Specification

M2-M36

Trademark

BNT

Origin

China

HS Code

731815

Production Capacity

1000ton/Month

Key features

Wide Material Selection: Available in Carbon Steel, SS201, SS304, SS316, and other stainless steel grades.

Multiple Finishing Options: Zinc, Black Oxide, Hot Dipped Galvanized, Geomet, and Nickel plated finishes.

Customization Service: Supports customization from samples, designs, and full bespoke fastening solutions.

Free Samples Available: Free samples for standard fasteners; weight under 1kg shipped free for new customers.

Professional Manufacturing: Cold/Hot forging and CNC machining for sizes M2-M100 with rigorous quality testing.

Flexible Delivery: Stock items deliver in 2-5 days; bulk orders take 10-30 days depending on season.

Certified Supplier: Verified supplier with ISO9001 certification and 13 years of export experience.

Competitive Pricing: Cost-effective solutions with competitive pricing strategy and high value delivery.

Company profile

Importers and ExportersHigh Repeat Buyers ChoiceYears of Export ExperienceFast Delivery

Bolnut Fastener Co., Ltd

Jiangsu, China

CertifiedBusiness Type: Trading Company CertifiedR&D Capacity: ODM Service Available & OEM Service Available CertifiedCustomization Options: Customization from Samples, Customization from Designs, etc. CertifiedExport Year: 13 YearsNearest Port: SHANGHAI , NINGBO ,ZHAPU , SHENZHEN, TIANJINGAverage Response Time: ≤0.90h

AI-Powered supplier vetting

SummaryThe supplier is identified as a trading company in Zhangjiagang, Suzhou, with business scopes covering labor protection products, apparel, textiles, communication equipment, electronics, and certain medical protective products. It is described as a professional technical supplier and offers multiple customization modes, ODM services, and OEM services for popular brands. However, it has only one R&D engineer, launched no new products in the past year, and does not provide 3D software or SDK services. Service procedures and complaint-handling procedures exist, but supplier approval records are incomplete. Financial information is represented only by reporting years, without performance values. No overseas warehouse, showroom, overseas branch or offline trade-show participation is reported.

Supplier typeThe supplier is explicitly classified as a trade company, while its stated scope includes labor protection products, apparel, textiles, medical protective equipment, communication equipment, and electronic products. It is also identified as a professional technical supplier, indicating a trading-oriented business with technical and customization support rather than confirmed manufacturing status.

After-Sales capabilityThe supplier has a clear complaint-handling procedure with followed records, and it has a corrective and preventive action mechanism with implementation records. However, its general service-assessment procedure has no records, and its approved-supplier list lacks approval signatures or dates, indicating documented but incompletely controlled service processes.

R&D capabilityThe supplier is identified as a professional technical supplier and offers ODM services, but it has only one R&D engineer, launched no new products in the past year, and lacks both 3D software design and SDK capabilities. This shows some technical development and design support, but limited demonstrated innovation output and digital R&D capability.

Customization capabilityThe supplier explicitly supports customization from samples, customization from designs, full customization, minor customization, and flexible customization. It also provides ODM services, directly evidencing broad customization and design-manufacturing support.

Client casesA repeat-buyer preference of 50%–80% is reported, and the supplier states that it provides OEM services for popular brands. These are positive customer-related indicators, but no named customers, specific projects, order examples, or independently verifiable case details are provided.