Are free samples available?

Yes, free samples are provided for customers to verify quality before placing bulk orders.

What quality inspections are performed on the steel bars?

Inspections include Spectral Tested, Microstructure Tested, Hardness Test, Macrostructure Test, and UT test.

Premium 4140 B7 Cold Drawn Alloy Round Steel Bar

Name: Premium 4140 B7 Cold Drawn Alloy Round Steel Bar
Brand: Shandong Dajin Metal Material Co., Ltd.
SKU: 767628142

Shandong, ChinaShandong Dajin Metal Material Co., Ltd.

US$900.00

5-9 Tons

US$880.00

10+ Tons

Sample price:US$1.00/piece.Request sample

Product profile

Customization

Available

Type

Round

Standard

AISI, ASTM, DIN, JIS

Model NO.

steel bar

Composition

Ferrous Steel Scrap

Technique

Cold Drawn

Shape

Bar

Surface Treatment

Polished

Special Use

Cold Heading Steel, Mold Steel

Application

Shaft,Bolts,Studs,Nuts

Raw Material

Hot Rolled Alloy Steel Bar

Supply Condition

Cold Drawn.Qt Steel Bar

Surface

Balck Surface or Bright Surface

Main Grade

4140 4130 B7 Scm415 Scm420 Scm435 Scm440

Transport Package

Seaworthy Packaging

Specification

10-300mm

Trademark

dajin

Origin

China

HS Code

72283000

Production Capacity

5000

Key features

High Strength & Toughness: Chromium and molybdenum content ensures uniform hardness, high strength, and excellent wear resistance.

Customizable Surface Finish: Available in Black Surface, Bright Surface, Polished, Turned, or Ground finishes based on client needs.

Wide Size Range: Round bars from 5mm-130mm, Square 6x6-100x100mm, Flat 3x20-50x100mm, and Hex 6mm-100mm.

Flexible Tolerance Options: Standard tolerances h9, h10, h11 available, or custom tolerances according to client requirements.

Fast Delivery for Stock Items: 7-10 days delivery for stock items; 30 days for new material orders after confirmation.

Free Sample Availability: Free samples are provided for quality verification before placing bulk orders.

Comprehensive Quality Inspection: Includes Spectral, Microstructure, Hardness, Macrostructure, and UT tests to ensure material integrity.

Multiple Grade Standards: Available in AISI 4140, ASTM, DIN 1.7225, JIS SCM440, and GB 42CrMo equivalents.

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: ≤8.06hTerms 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.