LEADING TOOL STEEL & ALLOY STEEL SUPPLIER

SUPPLY TOP QUALITY TOOL STEEL WORLDWIDE

Why Us

Over 20 Years Experience

Otai has over 20 years of professional experience for 4140 / 42CrMo4 plate, 4140 round, 1.2738 steel plate, and 34CrNiMo6 round bar etc. We know customers’ concerns and avoid problems with delivery.

ISO 9001 Certified & SGS

We are ISO9001:2015 certified and our supplied products also pass SGS inspection. Quality is key to winning long-term cooperation with customers.

10000+ Tons 4140 Plate

As the No. 1 Stockist of AISI 4140 / 42CrMo4 steel plate, we keep daily stock of over 10000 tons from 4mm to 300mm thickness. Machined and finished ground pieces are also available.

Professional Staff

Our skilled and professional staff will solve your problems and worries pre-sales or after-sales. You are comfortable during our cooperation.

Featured Customers

UDDEHOLM- buys from otai continuously
fastenal-buys from Otai for fasten products
thyssenkrupp is also our key important customer on plastic mold steel material
schlumberger-buys 8620 steel round bar from Otai with required technical specification
BOHLER is OTAI's VIP customer in alloy steel and tool steel

Latest News & Blog

How to Buy 4140 Steel: A Complete Purchasing Guide

How to Buy 4140 Steel: A Complete Purchasing Guide

Choosing the correct steel grade is only the first step. Selecting the right supplier, delivery condition, size, testing requirements, and quality standard is equally important. Many buyers focus only on […]

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Common Applications of 4140 Steel

One of the biggest reasons for the worldwide popularity of 4140 alloy steel is its versatility. Instead of being limited to one industry, 4140 steel is used across dozens of […]

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SAE AISI 4140-steel-plate--2

4140 Steel Heat Treatment: Unlocking Its Full Performance

One of the biggest reasons engineers choose 4140 alloy steel is its outstanding response to heat treatment. Unlike ordinary carbon steels, 4140 can achieve a wide range of mechanical properties […]

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