What payment terms are accepted?

We accept LC, T/T, D/P, and Western Union as terms of payment.

What is the warranty period for this product?

The product comes with a 1-year warranty and 1 year of after-sales service.

4140 Qt Steel Bar with B8 Grade for Optimal Performance

Name: 4140 Qt Steel Bar with B8 Grade for Optimal Performance
Brand: Shandong Dajin Metal Material Co., Ltd.
SKU: 2182542802

Shandong, ChinaShandong Dajin Metal Material Co., Ltd.

US$1,050.00

3 Tons

Sample price:US$0.00/piece.Request sample

Product profile

Customization

Available

After-sales Service

1 Year

Warranty

1 Year

Model NO.

round bar

Type

Alloy Steel Bar

Standard

AISI, ASTM, GB, JIS

Technique

Cold Drawn

Application

B7 Threading Rod

Surface Treatment

Polished

Alloy

Special Use

B7 Studs

Main Quality Leverl

B7 L7 B16 B8

Surface

Polished Surface

Main Grade

B16 4140 Alloy Steel

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, ensuring 125 ksi tensile strength.

Customized Dimensions: Available in diameters 1/2''-3 1/4'' with custom lengths tailored for container loading.

Precision Surface Quality: Strict diameter tolerances (h9-h11) minimize material waste during thread-rolling.

Verified Quality Assurance: Every batch includes MTR verifying chemical composition, tensile strength, and impact properties.

Optimized for Threading: Optimized grain flow and uniform hardness for automatic lathe turning and high-speed thread rolling.

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

Stable Supply Capability: Direct mill pricing with stable, long-term supply capability for overseas fastener factories.

Versatile Alloy Material: AISI 4140 heat-treatable steel offering atmospheric corrosion resistance, toughness, and fatigue strength.

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: ≤7.55hTerms 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 standards does the steel bar comply with?

The product is fully compliant with ASTM A193 Grade B7, AISI 4140, SAE 4140QT, and other standards like ASTM A320 L7.

Q:What are the available size ranges and pitch options?

Diameters range from 1/2'' to 3 1/4''. Custom lengths are available, and pitch sizes are customized for standard and special requirements.

Q:Is the material customizable for specific applications?

Yes, we provide customized lengths tailored for container loading and specific client fabrication lines, along with various diameter options.

Q:What quality certifications are provided with the order?

A Mill Test Report (MTR) is provided for every batch, verifying deep hardenability, structural integrity, chemical composition, and mechanical properties.

Q:What is the typical lead time for production?

The average lead time is one month during peak season and within 15 workdays during the off-season.