Stainless Steel Nuts Product Description and Publication

Product Overview

Stainless steel nuts are internally threaded fasteners designed to mate with bolts, studs, or threaded rods. They provide reliable clamping force and are widely used in environments where corrosion resistance, hygiene, and mechanical strength are required. Common types include hex nuts, heavy hex nuts, flange nuts, nylon insert lock nuts, dome nuts, and square nuts.

Material Grades

Stainless steel nuts are produced from a range of corrosion-resistant alloys. The most frequently used grades are listed below.

Applicable Standards

Stainless steel nuts are normally manufactured according to international and national standards, including:

• ISO 4032, ISO 4033, ISO 4034
• DIN 934, DIN 985, DIN 6923
• ASTM A194 / A194M
• ASME B18.2.2
• GB/T 6170, GB/T 6172

Mechanical Properties

Mechanical performance depends on the grade and standard selected. Typical values for common austenitic stainless steel nuts are provided in the following table.

Heavy hex nuts made to ASTM A194 grades such as 8M, 8T, or B8 are available for high-temperature and high-pressure bolting applications.

Corrosion Resistance and Surface Finish

Stainless steel nuts resist oxidation and corrosion through a passive chromium oxide layer. Passivation treatment can be applied to remove free iron and enhance this protective film. Common surface finish options include:

• Bright polished
• Satin finish
• Passivated finish
• Anti-galling coating

Dimensional Range

The standard production range covers:

• Metric sizes: M3 to M64
• Imperial sizes: #4-40 to 2-1/2 inch
• Thread pitches: coarse, fine, and special pitch on request

Typical Applications

Stainless steel nuts are suitable for use in demanding environments, including:

• Marine and offshore equipment
• Chemical and petrochemical processing plants
• Food and beverage machinery
• Pharmaceutical production equipment
• Construction and architectural fittings
• Automotive exhaust and trim systems
• Water treatment facilities

Packaging and Marking

Products are supplied in cartons, poly bags, or wooden pallets depending on size and quantity. Standard packaging options range from 100 pcs to 10,000 pcs per package. Custom packaging with labels, barcodes, and export packing is also available. Each lot includes traceability information such as heat number, material grade, size, and applicable standard.

Quality Assurance

All stainless steel nuts are manufactured under an ISO 9001 certified quality management system. Inspection procedures include:

• Dimensional checks with thread gauges
• Optical sorting for surface defects
• Hardness and tensile testing
• Salt spray testing for corrosion resistance
• Material certification and traceability documentation

Ordering Information

To place an order, specify the following details:

• Nut type: hex, heavy hex, flange, lock nut, dome nut
• Material grade: 304, 316, 316L, 410, 904L, or other
• Thread size and pitch
• Applicable standard: DIN, ISO, ASTM, ASME, GB/T
• Surface finish
• Quantity and packaging requirements

This product description is intended to assist purchasing, engineering, and quality teams in selecting the correct stainless steel nut for their application.