Product Overview
The Precision Rolled Nut is a high-grade nut manufactured through a cold-forming precision rolling process. This technique forms threads by displacing material rather than cutting it, resulting in a continuous, unbroken grain flow that follows the thread contour. This significantly enhances the nut’s mechanical strength, fatigue resistance, and dimensional consistency compared to machined alternatives. It is engineered for critical applications demanding reliable, high-clamp-force bolted joints.
Key Features & Benefits
Superior Mechanical Properties: The cold-rolling process work-hardens the material and creates a dense, uninterrupted grain structure, offering higher tensile and fatigue strength.
Exceptional Thread Accuracy: Produces threads with precise pitch, flank angle, and lead, ensuring smooth engagement and optimal load distribution. Compliant with ISO (International), DIN (German), and ASME (American) thread standards.
Excellent Surface Finish: Rolled threads have a smoother, harder surface than cut threads, reducing friction during installation and improving corrosion resistance.
Material & Cost Efficiency: The process minimizes material waste (no chips) and allows for high-volume, consistent production, offering excellent value for performance-critical applications.
Consistent Quality: Automated production ensures uniform mechanical properties and dimensions across large batches.
Material Specifications & Strength Grades
| Material Standard | Grade / Class | Proof Load / Strength | Core Hardness | Characteristics & Typical Applications |
|---|---|---|---|---|
| Medium Carbon Steel | Grade 8 / Class 10 | 830 MPa min | HRC 24-32 | Quenched & tempered. General high-strength use in machinery & construction. |
| Alloy Steel | Grade 12 / Class 12 | 970 MPa min | HRC 33-39 | Quenched & tempered. For highest strength demands in critical assemblies. |
| Stainless Steel (Austenitic) | A2-70 / A4-80 | 450 MPa min | – | AISI 304 (A2-70) & 316 (A4-80). Corrosion resistance for harsh environments. |
| Brass / Copper Alloy | – | – | – | Good conductivity, corrosion resistance, non-magnetic for electrical/special uses. |
Standard Series & Specifications
Our Precision Rolled Nuts are manufactured to meet or exceed the following international standards for dimensions, mechanical properties, and tolerances:
Metric Hex Nuts (ISO/DIN): ISO 4032 / DIN 934 (Style 1), ISO 4034 / DIN 934 (Style 2 – thicker). Common property classes: 8, 10, 12.
Imperial Heavy Hex Nuts (ASME): ASME B18.2.2. Grades: 5, 8, 10K.
Nylon Insert Locknuts: DIN 985 / ISO 7040. Prevailing torque type with non-metallic locking element.
Flange Nuts: DIN 6923 / ISO 4161. Integrated washer face for load distribution.
Size Range: Metric: M3 to M36. Imperial: 1/4″ to 1-1/2″.
Available Surface Finishes & Treatments
| Finish Type | Specification / Standard | Typical Salt Spray Resistance (Neutral) | Primary Purpose |
|---|---|---|---|
| Zinc Plating, Blue/Yellow Chromate | ASTM B633 | 72 – 96 hours to white rust | Economical, standard corrosion protection. RoHS compliant. |
| Zinc-Nickel Alloy Plating | – | 500+ hours to red rust | High-performance corrosion resistance for automotive & offshore. |
| Hot-Dip Galvanized | ASTM A153 | Variable, very high | Thick coating for extreme outdoor exposure (e.g., structural steel). |
| Black Oxide/Phosphate & Oil | MIL-DTL-13924 / Commercial | Minimal, provides appearance & break-in | Mild corrosion resistance, reduces glare, aids in break-in. |
| Electroless Nickel Plating (ENP) | MIL-DTL-32119 / ASTM B656 | 96+ hours | Good wear & corrosion resistance, uniform coating. |
| Passivation (Stainless Steel) | ASTM A967 / ISO 16048 | Enhances inherent resistance | Removes free iron and maximizes the passive oxide layer on SS. |
| Geomet® / Delta Protekt® | Proprietary | 500 – 1000+ hours | Dry-film, lubricious coating. Excellent corrosion & torque-tension control. |
Quality Assurance & Traceability
Manufacturing Standards: Production is governed by a certified ISO 9001:2015 Quality Management System. We are also compliant with IATF 16949 standards for automotive applications.
Process Control: In-process inspections include dimensional checks (go/no-go gauges, optical comparators), thread profile verification, and hardness testing.
Documentation: Full material traceability is maintained. Certificates of Compliance (CoC) and Mill Test Reports (MTR) are available upon request for each production batch, detailing chemical composition and mechanical properties.
About Our Manufacturing
Our Precision Rolled Nuts are produced by Hebei Wohe Fastener Manufacturing Co., Ltd., a specialist manufacturer with over 15 years of expertise in cold-forming technology. Our facility, located in China’s major industrial region, is equipped with modern multi-station cold-headers, precision thread-rolling machines, and automated heat-treatment lines. This integrated process ensures control over the entire manufacturing cycle, from raw material to finished product, guaranteeing the high strength and consistency that define precision rolled components. Our products are supplied to OEMs and distributors worldwide in industries including automotive, agricultural equipment, industrial machinery, and general engineering.
Technical & Commercial Support:
Samples: Available upon request for qualification testing.
Customization: We support production of non-standard sizes, special heights, unique markings, and proprietary surface treatments.
Packaging: Standard export packaging in carton boxes or kegs, with neutral or customer-specific labeling options.
MOQ: For standard items, Minimum Order Quantity starts at 5,000 pieces. Custom specifications are negotiable.
Lead Time: Standard items: 15-20 working days. Custom or large-volume orders: quoted based on specific requirements.
*Note: All technical data provided is based on laboratory testing under standard conditions and is for reference purposes. The suitability of a fastener for a specific application must be evaluated by the user, considering all service conditions, including load, environment, and assembly practices. Product specifications are subject to continuous improvement and may change without prior notice.
