Product Overview
DIN933 hex cap bolt is a fully threaded hexagonal head fastener designed for structural and mechanical assemblies requiring uniform load distribution and metric standard compliance. It is used in load-bearing steel structures, heavy machinery, and construction frameworks.
Technical Specifications
| Parameter | Specification |
| Standard | DIN 933 / ISO 4017 |
| Type | Hex Cap Bolt / Hex Cap Screw (Fully Threaded) |
| Thread Type | Metric coarse thread |
| Thread Coverage | Fully threaded |
| Diameter Range | M6 – M36 |
| Length Range | 10 mm – 300 mm |
| Head Type | Hexagonal head |
| Drive Type | Wrench / Socket |
| Strength Grades | 4.8 (Carbon steel), 8.8 (Carbon steel), 10.9 (Alloy steel), 12.9 (Alloy steel) |
| Material Options | Carbon steel, Alloy steel, Stainless steel |
| Surface Treatments | Zinc plated, Hot-dip galvanized, Dacromet / Zinc flake, Black oxide |
| Dimensional Symbols | d: thread diameter, L: bolt length, k: head height, s: width across flats, e: width across corners, d1: shank core diameter |
Key Features
Fully threaded shank enables engagement along the entire fastener length for variable joint thickness assemblies.
Hex head provides defined wrench flats for controlled torque transmission during installation and maintenance.
Continuous thread form allows adjustable nut positioning during assembly.
Hex head geometry maintains consistent tool engagement under repeated tightening cycles.
Applications
Steel structure buildings and frameworks
Bridge engineering and infrastructure projects
Industrial machinery assembly
Mechanical equipment installation
Construction frameworks and heavy-duty structural connections
Standards Comparison
| Standard | Thread Type | Notes |
| DIN 933 | Fully threaded | Full engagement along the shank, suitable for structural connections |
| DIN 931 | Partially threaded | Smooth shank section for shear applications |
| ISO 4017 | Fully threaded | Metric international equivalent of DIN 933 |
| ISO 4014 | Partially threaded | Metric international equivalent of DIN 931 |
FAQ
Q: What is the difference between DIN933 and DIN931 hex bolts?
A: DIN933 is fully threaded, allowing engagement along the entire shank. DIN931 is partially threaded, leaving a smooth shank section for shear applications.
Q: Which strength grade is suitable for structural applications?
A: Grade 8.8 is used for medium to high-load connections, while grade 10.9 is recommended for higher-load or critical assemblies.
Q: Can DIN933 hex cap bolts be used outdoors?
A: Yes, with corrosion-resistant coatings such as hot-dip galvanizing or Dacromet, suitable for outdoor or high-moisture environments.
Q: Are DIN933 bolts compatible with ISO standards?
A: Yes, DIN933 fully threaded hex bolts correspond to ISO4017, ensuring dimensional interchangeability within metric systems.
Q: How to ensure proper torque and installation?
A: Use wrenches or sockets matching the hex head size. Fully threaded bolts allow flexible nut positioning, and the hex head maintains consistent tool engagement under repeated tightening.
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