What are the main applications for this steel bar?

It is widely used for high-strength fasteners in oil and gas, petrochemical, power generation, offshore marine, and pressure vessel industries.

What is the typical lead time for orders?

Lead time is within 15 workdays during the off-season and approximately one month during the peak season.

Can I customize the raw material grade?

Yes, we offer customization for raw material grades including 4140, B16, 304, 316, and others based on your requirements.

High-Strength B7 Threaded Bar ASTM A193 Grade 4140 Steel

Name: High-Strength B7 Threaded Bar ASTM A193 Grade 4140 Steel
Brand: Shandong Dajin Metal Material Co., Ltd.
SKU: 2186776492

Shandong, ChinaShandong Dajin Metal Material Co., Ltd.

US$1,050.00

2 Tons

Sample price:US$1.00/piece.Request sample

Product profile

Customization

Available

Standard

AISI, ASTM, GB, JIS, ASTM A193 B7 B16,ASTM A320 L7

Technique

Cold Drawn

Model NO.

round bar

Application

B7 L7 B16 Threading Rod

Surface Treatment

Polished

Alloy

Special Use

B7 L7 B16 Studs

Raw Material Grade

4140 B16 304 316 etc.

Quality Level

B7 B8m B16 L7

Ready Stock

Yes

Factory Directly

Yes

Transport Package

Anti-Rust Pacakging

Specification

1/2''-4''

Trademark

dajin

Origin

China

Production Capacity

5000

Key features

High-Strength Material: AISI 4140 alloy steel meeting ASTM A193 Grade B7 standards for superior strength.

Precision Machinability: Cold drawn with h9-h11 tolerance, optimized for thread-rolling and low tool wear.

Uniform Hardness: Quenched & Tempered process ensures consistent hardness across the entire cross-section.

Full Traceability: Complete Mill Test Report (MTR) provided for every order, linking to specific heat numbers.

Ready Stock Available: Inventory ready for immediate dispatch, ensuring fast turnaround for urgent projects.

Export-Ready Packaging: Professional anti-rust treatment and reinforced packaging for safe long-distance transport.

Multi-Industry Application: Ideal for oil & gas, petrochemical, power generation, and offshore marine fasteners.

Custom Material Grades: Available in 4140, B16, 304, 316, and other grades based on specific project needs.

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: ≤10.33hTerms 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.

Product Q&A

Q:What is the standard and grade of this steel bar?

The product is AISI 4140 alloy steel compliant with ASTM A193 Grade B7 standard.

Q:Does the product come with a Mill Test Report (MTR)?

Yes, every order includes a complete MTR with detailed chemical analysis and mechanical property verification, ensuring full traceability to the heat number.

Q:What is the diameter tolerance for the cold drawn bars?

The bars feature precision h9 to h11 diameter tolerances, ensuring uniform grain structure and excellent thread formation.

Q:Is the material suitable for thread rolling?

Yes, the bars are specifically engineered for thread-rolling applications, offering reduced tool wear and high machinability.

Q:What are the available surface treatments?

The product is available in polished and semi-finished states, with professional anti-rust treatment for export.