Thin Hexagon Nuts (DIN 439)
Q1: What is DIN 439?
A1: DIN 439 specifies the dimensions and requirements for Metric Thin (Low-Height) Hexagon Nuts. These nuts are characterized by a significantly reduced height—approximately half that of a standard hex nut—making them a space-saving solution for assemblies with limited clearance. They are designed for light to medium-duty fastening applications and can also serve effectively as jam nuts when tightened against a primary nut to prevent it from loosening.
Q2: What is the ISO equivalent of DIN 439?
A2: The internationally recognized equivalent standard is ISO 4035 for metric thin hexagon nuts.
Q3: Material Selection Guide for DIN 439 Thin Hex Nuts
The choice of material determines the nut's strength, corrosion resistance, and suitability for specific environments and functions.
| Material Category | Typical Grade/ Class | Standard Finish / Properties | Performance & Key Characteristics | Typical Applications | Pros & Cons |
| Medium-Strength Steel | 5 / 04 | Zinc-Plated: Provides basic protection against occasional moisture. | Standard strength for general-purpose fastening in non-corrosive environments. The thin profile saves space. | General machinery, equipment, and as jam nuts in dry or indoor settings. | Pros: Cost-effective, readily available. Cons: Limited corrosion resistance. |
| Stainless Steel A2 (18-8) | A2-70 | Naturally corrosion-resistant; no plating needed. | Good corrosion resistance, suitable for wet, outdoor, and mildly chemical environments. | Outdoor fixtures, food industry, marine interiors, and damp applications requiring a low-profile nut. |
Pros: Good balance of corrosion resistance and strength. Cons: Not for severe chemical exposure. |
| Stainless Steel A4 (316) | A4-80 | Naturally corrosion-resistant; no plating needed. | Excellent corrosion resistance, withstands harsh weather, salt water, and most chemicals. | Highly corrosive environments: chemical processing, marine exteriors, coastal installations. |
Pros: Maximum corrosion resistance. Cons: Higher cost; lower strength than equivalent steel grades. |
| Brass | (Commonly Commercial Grade) | Naturally corrosion-resistant, conductive, and non-magnetic. | Softer metal, will not gall or damage mating threads. Excellent electrical conductivity. | Electrical enclosures, circuit boards, grounding connections, and applications where non-magnetic or spark-resistant properties are needed. | Pros: Conductive, non-magnetic, corrosion-resistant, non-sparking. Cons: Lower mechanical strength than steel; not for high-stress applications. |
General Notes & Application Guidelines:
Primary Use: Designed for fastening in unthreaded holes or as a jam nut. The low height is ideal for confined spaces.
Strength Matching: As with all nuts, it is crucial to match the nut's strength grade (e.g., Grade 5) with a comparable or higher-strength bolt/screw to prevent thread stripping during installation.
Jam Nut Function: When used as a jam nut, it is typically tightened against the face of a primary (full-height) nut to lock it in position, rather than to provide significant clamping force itself.
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DIN 439 Dimensions |
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Active Stock List (All items are currently in stock)：
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PIC |
PRODUCT |
SIZE |
GRADE |
FINISH |
THREAD |
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Thin Hexagon Nuts (DIN 439) - Stainless Steel (A2) |
M1.6-M42 |
A2 Grade |
Natural |
Coarse |
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Thin Hexagon Nuts (DIN 439) - Marine Stainless Steel (A4) |
M1.6-M42 |
A4 Grade |
Natural |
Coarse |
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Thin Hexagon Nuts (DIN 439) - Brass |
M1.6-M42 |
Brass |
Natural |
Coarse |
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Thin Hexagon Nuts (DIN 936) - Zinc Plated Mild Steel (Grade 4.6) |
M1.6-M42 |
Class 4 |
Zinc plated |
Coarse |
