What is the maximum straightness tolerance?

The maximum straightness is 3mm per meter.

How are the steel bars packaged?

Bars are bundled and securely metal strapped in 3 places, with optional plastic bag or pallet loading.

Premium 5140 4140 B7 Cold Drawn Alloy Steel Round Bar

Name: Premium 5140 4140 B7 Cold Drawn Alloy Steel Round Bar
Brand: Shandong Dajin Metal Material Co., Ltd.
SKU: 750280152

Shandong, ChinaShandong Dajin Metal Material Co., Ltd.

US$700.00-900.00

10 Tons

Sample price:US$1.00/piece.Request sample

Product profile

Customization

Available

Type

Profile

Standard

AISI, ASTM, DIN, JIS, GB

Model NO.

BAR

Composition

Alloy Steel or Carbon Steel

Technique

Hot Rolled or Cold Drarwn

Shape

Bar Hexagon Square

Surface Treatment

Polished

Special Use

Cold Heading Steel, Free Cutting Steel

Application

Structural Steel Bar

Cold Drawn Diameter

10mm-130mm

Hot Rolled Diameter

20mm-310mm

Forged Diameter

200mm-1000mm

Heat Treatment

Qt/Annealed/Nomalized

Surface

Cold Drawn+Smoothly/Peeled+Polished/Black

Delivery Time

30days

Transport Package

Anti-Rust Packaging

Specification

diameter: 10mm-300mm

Trademark

customized

Origin

China

Production Capacity

5000tons

Key features

Wide Diameter Range: Cold drawn 10-130mm, Hot rolled 20-310mm, Forged 200-1000mm available.

Multiple Surface Treatments: Options include polished, peeled, cold drawn, and black finish.

Custom Heat Treatment: Available in QT, Annealed, or Normalized states per client request.

Strict Quality Control: Includes spectral, microstructure, hardness, and UT testing.

International Certifications: ISO9001, ISO/TS16949, CE Mark, JIS MARK, and KS MARK certified.

Fast Stock Delivery: 7-10 days for stock items, 30 days for new material orders.

Free Sample Available: Customers can request free samples for quality verification.

Flexible Packaging: Bundled with metal straps, plastic bag wrapped, or pallet loaded.

Company profile

Shandong Dajin Metal Material Co., Ltd.

Shandong, China

Business Type: Manufacturer/FactoryExport Year: 2017-03-04Nearest Port: Qingdao port, Tianjin port, Shanghai portAverage Response Time: ≤9.77hTerms of Payment: LC, T/T, D/P, etc.International Commercial Terms(Incoterms): FOB, CFR, CIF, FAS, DDP, CPT, FCA, EXW

AI-Powered supplier vetting

SummaryShandong Dajin Metal Material Co., Ltd. is identified as a Chinese manufacturer/factory based in Shandong, with four production lines, stated production capacities for several steel-bar categories, and export activity across multiple regions. It holds ISO 9001 and OHSAS/OHSMS 18001 certifications and states that it can supply multiple international standards and customized steel products. The supplier reports export activity since 2017 and that exports represent 51%–70% of total sales. Evidence supports production scale, certification, customization, and international trading capability. However, the provided information does not sufficiently establish after-sales service processes, innovation capability, or financial credibility. Trade records show named buyers and shipments involving Brazil and Pakistan, but the limited transaction evidence does not establish broad or sustained customer performance.

Supplier typeThe supplier is explicitly classified as a Manufacturer/Factory and operates as Shandong Dajin Metal Material Co., Ltd., a limited company located in Shandong, China. This directly supports its status as a manufacturing supplier rather than only a trading entity.

CertificationsThe supplier reports holding ISO 9001 and OHSAS/OHSMS 18001 management-system certifications. These stated certifications provide explicit evidence of quality-management and occupational health and safety systems, although certificate validity dates and scope are not provided.

Production capacityThe supplier reports four production lines, 11–20 years of total R&D-engineer experience, 11–20 quality-control staff, and substantial stated capacities for steel bar, carbon steel round bar, and cold-drawn steel bar. It also reports ready stock of 1,000–1,500 tons for specified products and exports to multiple global regions, providing explicit evidence of meaningful production and fulfillment capability.

Customization capabilityThe supplier explicitly states that it can provide products to GB, American, German, Japanese, industry, and special steel standards and can offer customized services according to customer requirements. Its listed grades and 5 mm–300 mm size range for certain stocked products further support product configuration flexibility.

Client casesTrade records associate the supplier with named buyers in Brazil and Pakistan and show shipments involving steel-related products through Qingdao, including a recorded transaction count of one for one buyer and two for another. These records provide evidence of actual international customer transactions, but the limited number of documented cases does not establish a broad, long-term, or independently verified customer portfolio.