Short Description:

DIN 557 Square Nuts

In industrial assemblies where rotation resistance, space constraints, and secure retention against bolts are critical, DIN 557 square nuts have become the preferred choice for square-hole and slot-based connections. Handan Haosheng Fastener Co., Ltd., a leading manufacturer based in Handan, China, specializes in producing high-quality DIN 557 square nuts, offering a square external profile and internal metric thread that lets the surrounding structure restrain rotation during tightening.

At Handan Haosheng Fastener Co., Ltd., our DIN 557 square nuts are engineered to match each assembly with the right material, finish, and thread specification, helping equipment builders reduce vibration loosening and assembly rework.

Why Choose Haosheng DIN 557 Square Nuts?

Our square nuts deliver several key advantages:

• ✔ Square anti-rotation design – four flat sides fit square holes and retaining slots, restraining rotation during tightening in assemblies with limited wrench access.
• ✔ Two material groups – carbon steel and stainless steel including A2 and A4 groups, selected by strength, environment, and corrosion needs.
• ✔ Made to DIN 557:2026-02 – produced as Grade C with metric M threads; Grade C covers dimensional, not mechanical, requirements.
• ✔ Five surface finishes – plain, blue zinc, yellow zinc, hot-dip galvanized, and zinc-nickel, chosen for the operating environment.

Haosheng’s Square Nut Solutions

At Handan Haosheng Fastener Co., Ltd., we offer:

• Customizable specs for width across flats, nut height, thread size, and material requirements per drawing.
• Various square nut types (DIN 557 standard, thin DIN 562, weld DIN 928, T-slot) with specified finishes.
• Strict quality control ensuring adherence to DIN 557, DIN 562, DIN 928, and applicable ISO thread standards.

Our DIN 557 square nuts are widely used in:

• Machinery and industrial equipment frames where rotation must be restrained.
• Metal brackets and structural assemblies built on square holes and nut housings.
• Retaining slots and enclosures in control cabinets and equipment panels.
• Equipment components supplied to international distributors and OEM builders.

Why Partner with Haosheng?

• ✅ 33 years of fastener manufacturing as a source factory in Yongnian, Handan.
• ✅ Full-category, full-material coverage across standards with one-stop supply.
• ✅ ISO 9001, 14001, and 45001 certified quality, environmental, and safety management.
• ✅ OEM/ODM and bulk supply with competitive pricing and stable lead times.

For industries demanding reliable, rotation-resistant fastening, Handan Haosheng’s DIN 557 square nuts deliver unmatched reliability.
Contact us today to discuss your requirements!