What is the surface treatment of the steel bar?

The steel bar features a polished surface and is available in Cold Drawn or Centerless Ground conditions.

What are the main applications for this steel bar?

It is primarily used for heavy-duty applications such as oil and gas fasteners, petrochemical industrial fasteners, power generation bolts, and offshore/marine grade fasteners.

Where is the factory located?

The factory is located in Guanli Road, Fengcheng Industry Zone, Laicheng District, Laiwu, Shandong, China.

Tough SAE4140 Qt Steel Bar for Heavy-Duty Applications

Name: Tough SAE4140 Qt Steel Bar for Heavy-Duty Applications
Brand: Shandong Dajin Metal Material Co., Ltd.
SKU: 2182685382

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

Thread-Rolling Ready Design: Uniformly refined grain structure and h9-h11 diameter tolerances minimize tool wear and enhance thread precision.

Superior Mechanical Consistency: Quenching & Tempering process ensures uniform hardness across the entire cross-section for exceptional stress performance.

Full MTR Traceability: Every order includes a Mill Test Report with chemical and mechanical verification traceable to the original heat number.

Export-Ready Packaging: Professional anti-rust treatment and reinforced packaging protect material integrity during maritime shipments.

High Strength & Durability: AISI 4140 alloy steel with min tensile strength of 125 ksi and max hardness of 35HRC for demanding applications.

Customizable Material Grades: Available in various raw material grades including 4140, B16, 304, 316, and quality levels like B7, B8m, L7.

Ready Stock Availability: Inventory is maintained in stock for immediate dispatch, ensuring fast turnaround for urgent production needs.

Factory Direct Supply: Directly sourced from the factory, offering competitive pricing and guaranteed quality control for bulk orders.

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.