Does the product come with a Mill Test Report?

Yes, each order includes a comprehensive Mill Test Report (MTR) with full traceability to the heat number.

What are the main applications for this steel bar?

It is used for oil and gas fasteners, petrochemical industrial fasteners, power generation bolts, and pressure vessel studs.

Quality Level B7 Threaded Rod Made From Tough 4140 Steel

Name: Quality Level B7 Threaded Rod Made From Tough 4140 Steel
Brand: Shandong Dajin Metal Material Co., Ltd.
SKU: 2182649782

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

ASTM A193 B7 Compliance: Meets rigorous ASTM A193 Grade B7 standards for high-pressure and high-temperature applications.

Q&T Heat Treatment: Quenched and Tempered process ensures consistent hardness and superior mechanical properties.

Thread-Rolling Ready: Uniform grain structure and tight h9-h11 tolerances reduce tool wear and facilitate thread formation.

Full MTR Traceability: Comprehensive Mill Test Reports provided with full chemical and mechanical verification.

Customizable Materials: Raw material grades like 4140, 304, 316, and quality levels B7, B8m, L7 are customizable.

High Tensile Strength: Minimum tensile strength of 125 ksi (860 MPa) for demanding industrial environments.

Professional Packaging: Anti-rust treatment and robust packaging protect material integrity during maritime transport.

Fast Lead Time: Off-season lead time within 15 workdays; peak season lead time one month.

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: ≤9.25hTerms 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 chemical composition of AISI 4140 B7 steel?

It includes Carbon (0.37-0.49%), Manganese (0.65-1.10%), Phosphorus (max 0.035%), Sulfur (max 0.040%), Silicon (0.15-0.35%), Chromium (0.75-1.20%), and Molybdenum (0.15-0.25%).

Q:What are the mechanical properties of the B7 steel bar?

Minimum tensile strength is 125 ksi, yield strength is 105 ksi, elongation is 16%, and hardness is max 321 HBW or 35 HRC.

Q:Is the product customizable?

Yes, raw material grades (4140, 304, 316, etc.) and quality levels (B7, B8m, B16, L7) are customizable.

Q:What is the lead time for orders?

Off-season lead time is within 15 workdays, while peak season lead time is one month.

Q:What payment terms are accepted?

Accepted terms include LC, T/T, D/P, and Western Union.