DIN 603 Carriage Bolt
Description
Technical Parameters
The DIN 603 carriage bolt features a smooth, rounded head and a square neck beneath the head. The square neck helps prevent rotation during tightening by engaging with wood or a matching square hole in a metal component. This design allows the nut to be tightened from the accessible side without needing to hold the bolt head with a wrench.
Carriage bolts are commonly used in timber connections, trailer assemblies, agricultural equipment, fencing, and general mechanical applications. Selection depends on the required dimensions, material, property class, surface finish, and compatibility with the connected components.
Product Features
Anti-Rotation Square Neck
The square neck engages with wood or a matching square opening in a metal component to resist rotation while the nut is tightened.
Smooth Dome Head
The rounded head provides a finished external appearance without an exposed drive recess.
Multiple Material Options
Carbon steel and stainless steel options can be selected according to mechanical requirements and environmental conditions.
Surface Finish Options
Available finishes may include zinc plating, hot-dip galvanizing, and plain finishes, depending on the product specification.
Technical Specifications
|
Parameter |
Specification |
|
Product Standard |
DIN 603 |
|
Thread Sizes |
M5–M20 |
|
Length Range |
16–200 mm |
|
Thread Type |
Metric thread |
|
Head Type |
Round head / dome head |
|
Neck Type |
Square neck |
|
Drive Type |
No drive recess; tightened using a mating nut |
|
Material |
Carbon steel or stainless steel |
|
Property Classes |
Confirm according to the applicable material and product standard |
|
Surface Finish |
Zinc plated, hot-dip galvanized, or plain finish |
|
Thread Direction |
Right-hand thread, unless otherwise specified |
Applications
Timber Construction
Used for timber-to-timber connections, wooden frames, fencing, and other assemblies where the square neck can engage with the wood.
Trailers and Vehicle Bodies
Suitable for fastening wooden deck boards, side panels, and selected brackets where the joint design and load requirements are compatible with carriage bolts.
Agricultural Equipment
Used in equipment panels, attachments, and frame assemblies where a smooth bolt head and resistance to rotation during tightening are useful.
Industrial Equipment and Enclosures
Suitable for selected brackets, guards, racks, and enclosure components with compatible mounting holes.
Key Selection Factors
Thread Diameter and Bolt Length
Select the thread diameter according to the joint design and required load capacity. Bolt length should account for the combined thickness of the connected materials, washers, and the nut, with sufficient thread engagement.
Square Neck Dimensions
Check the neck dimensions against the mating material. For metal components, the square opening must match the neck geometry. For timber, consider the wood type, hole size, and risk of crushing or splitting.
Material and Property Class
Choose the material and mechanical properties according to the application load, service conditions, and relevant fastener standard. Do not select a higher property class without checking the requirements of the connected components and joint design.
Surface Finish and Corrosion Protection
Choose the finish based on moisture, chemicals, outdoor exposure, and the expected service environment. For hot-dip galvanized fasteners, verify dimensional compatibility with the mating threads and nuts. Stainless steel grades should be selected according to the actual corrosion environment.
Applicable Standard
Confirm that the bolt dimensions and mechanical properties meet the required standard. If a project specifies DIN 603, verify dimensional compatibility before substituting another standard.
Our Certificate
FAQ
Q: What is the purpose of the square neck on a DIN 603 carriage bolt?
A: The square neck engages with wood or a matching square hole in a metal component to resist rotation while the nut is tightened.
Q: Can carriage bolts be used in blind holes?
A: DIN 603 carriage bolts are generally used in through-hole joints where a nut can be installed on the opposite side. Blind-hole applications usually require a different fastening arrangement.
Q: What is the difference between property classes 4.8 and 8.8?
A: Property class 4.8 has a nominal tensile strength of 400 MPa, while class 8.8 has a nominal tensile strength of 800 MPa. Actual requirements and suitability depend on the applicable standard, bolt dimensions, material, and joint design. Confirm that the selected class is available for the specified carriage bolt.
Q: Are custom lengths available?
A: Custom lengths may be possible depending on manufacturing capability, tooling, material, and order quantity. Provide a drawing or detailed specification for confirmation.
Q: What documents can be supplied with an order?
A: Documentation depends on the agreed order requirements and the supplier's actual inspection and traceability systems. Specify any required material certificates, inspection reports, or compliance documents when requesting a quotation.
Request a Quote
For a quotation, provide the required thread diameter, bolt length, applicable standard, material or property class, surface finish, order quantity, and delivery destination.
For non-standard requirements, attach a technical drawing or sample specification. Include any special dimensional tolerances, inspection requirements, and documentation needs so the product can be assessed against your purchasing specifications.
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