Cap Nuts (DIN 917)
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: Compare DIN 917 Hex Cap Nuts by material type.
| Material Category | Typical Grade/ Designation | Standard Finish / Properties | Performance & Key Characteristics | Typical Applications | Pros & Cons |
| Low-Strength Steel | Class 6 | Zinc-Plated: Provides basic protection against occasional moisture. | Low strength, suitable for light-duty fastening where clamping force is not critical. | Concealing threads on access panels, covers, or non-structural components in dry environments. |
Pros: Most economical option. Cons: Very limited strength and corrosion resistance. |
| Stainless Steel A2 (18-8) | A2-70 | Naturally corrosion-resistant; often polished for aesthetics. | Good corrosion resistance, suitable for damp, outdoor, and mildly chemical environments. | Architectural metalwork, food & beverage equipment, marine interiors, and outdoor fixtures. |
Pros: Excellent balance of corrosion resistance, strength, and appearance. Cons: Not for severe chemical exposure (e.g., chlorides). |
| Stainless Steel A4 (316) | A4-80 | Naturally corrosion-resistant; can be polished. | Excellent corrosion resistance, withstands harsh weather, salt water, and most chemicals. | Marine exteriors, chemical processing plants, coastal installations, and highly corrosive settings. |
Pros: Maximum durability in aggressive environments. Cons: Higher material cost. |
General Notes:
Primary Purpose: Used as a decorative cover and thread protector. Not designed to be a primary load-bearing nut, though medium and high-strength versions can be used in structural applications if properly rated.
Alternative Names: Also known as Blind Nuts, Acorn Nuts (though these often have a higher dome), or Hex Blind Nuts.
Thread Compatibility: Available in various thread pitches (e.g., metric, UNC, UNF) to match corresponding bolts and screws.
Download DIN 917 Dimensions pdf and DIN 917 Weight Chart or views online
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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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M3-M30 |
A2 Grade |
Natural |
Coarse |
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M3-M30 |
Class 4 |
Zinc plated |
Coarse |
