What payment terms are accepted?

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

What are the main applications for this steel?

It is primarily used for high-strength B7/L7 threaded rods, stud bolts, and fasteners in oil & gas, petrochemical, power generation, and offshore industries.

How is the product packaged for export?

Products undergo professional anti-rust treatment and are reinforced packaged to ensure integrity during maritime transport.

Tough SAE4140 Qt Steel for High-Strength B7 Threaded Rod

Name: Tough SAE4140 Qt Steel for High-Strength B7 Threaded Rod
Brand: Shandong Dajin Metal Material Co., Ltd.
SKU: 2182544082

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 meets ASTM A193 Grade B7 standards for demanding applications.

Precision Tolerances: Diameter tolerance precision h9-h11 ensures uniform grain structure for thread-rolling.

Superior Consistency: Quenched & Tempered process guarantees uniform hardness across the entire cross-section.

Full Traceability: Each order includes a Mill Test Report (MTR) traceable to the original heat number.

Customizable Grades: Raw material grades include 4140, B16, 304, 316, etc., to suit specific needs.

Export-Ready Packaging: Professional anti-rust treatment and reinforced packaging safeguard material integrity.

Fast Delivery: Off-season lead time within 15 workdays; ready stock available for immediate dispatch.

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

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: ≤7.47hTerms 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 the steel?

The steel is AISI 4140 (Cr-Mo Alloy) compliant with ASTM A193 Grade B7, featuring specific ranges for Carbon, Manganese, Phosphorus, Sulfur, Silicon, Chromium, and Molybdenum.

Q:What are the mechanical properties?

Minimum tensile strength is 125 ksi (860 MPa), with a maximum hardness of 35 HRC (close to 30 HRC guaranteed) and elongation of 16-18% depending on diameter.

Q:Is the product customizable?

Yes, we offer customization for raw material grades (4140, B16, 304, 316, etc.) and quality levels (B7, B8m, B16, L7).

Q:Do you provide Mill Test Reports (MTR)?

Yes, every order comes with a comprehensive MTR detailing chemical analysis, heat treatment details, mechanical test results, and traceability to the heat lot.

Q:What is the lead time for orders?

Off-season lead time is within 15 workdays, while peak season lead time is approximately one month. Ready stock is also available.