What is the lead time for orders?

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

What payment terms do you accept?

We accept LC, T/T, D/P, and Western Union for international transactions.

Can you supply for high-temperature applications?

Yes, our ASTM A193 B7 raw material is designed for high-temperature and high-pressure service bolting.

High Strength 4140 Qt Steel Round Bar for Industrial Use

Name: High Strength 4140 Qt Steel Round Bar for Industrial Use
Brand: Shandong Dajin Metal Material Co., Ltd.
SKU: 2176956282

Shandong, ChinaShandong Dajin Metal Material Co., Ltd.

US$1,050.00

1 Ton

Sample price:US$1.00/piece.Request sample

Product profile

Customization

Available

After-sales Service

1 Year

Warranty

1 Year

Model NO.

steel round bar

Type

Alloy Steel Bar

Standard

AISI, ASTM, GB, JIS, ASTM 193 B7 ASTM A320 L7

Technique

Cold Drawn

Application

B7 Threading Rod

Surface Treatment

Polished

Alloy

Special Use

B7 Studs

Main Quality Level

B7 L7 B16 B8m

Main Grade

4140 B16 4150

Steel Type

Alloy Steel

Ready Stock

Yes

Transport Package

Anti-Rust Packaging

Specification

1/2''-4''

Trademark

DAJIN

Origin

China

Key features

ASTM A193 B7 Compliance: Fully compliant with ASTM A193 B7 mechanical requirements including 125 ksi tensile strength.

Cold Drawn Q&T Process: Quenched and Tempered cold drawn AISI 4140 alloy steel for superior hardness and machinability.

Mill Test Report Included: Complete MTR provided with chemical analysis, heat treatment details, and mechanical test results.

Precision Diameter Tolerance: Strict diameter tolerances (h9-h11) minimize material waste during thread-rolling processes.

Custom Length Availability: Available in various diameters (1/2"-3 1/4") with custom lengths for immediate dispatch.

Large Stock Capacity: Maintain 1500-3000 tons of raw material in factory for stable long-term supply.

1-Year Warranty Coverage: Comprehensive 1-year warranty covering mechanical defects and material integrity.

Global Logistics Support: Expert export packaging, anti-rust bundling, and secure shipping to global industrial hubs.

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: ≤6.18hTerms 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.