Ribbed Neck Carriage Bolt
Description
Technical Parameters
The ribbed neck carriage bolt is designed for structural connections requiring resistance to bolt rotation during tightening. It features a smooth domed head and a ribbed section directly beneath the head. The ribs engage with a compatible mating material or prepared hole, helping hold the bolt in position while the nut is tightened.
Ribbed neck carriage bolts can be used in selected vehicle assemblies, agricultural equipment, and wood-to-metal connections. Suitability depends on the neck geometry, hole dimensions, substrate properties, fastener grade, and joint requirements.
Product Features
Anti-Rotation Ribbed Neck
The ribs beneath the head provide mechanical engagement with the mating material or prepared hole. The effectiveness of this feature depends on rib geometry, hole tolerance, substrate properties, and installation conditions.
Domed Head Profile
The rounded head provides a smooth exposed surface without external wrench flats. Head diameter and height should be checked against the assembly's clearance and installation requirements.
Threaded Shank
Metric or inch-series threads can be selected according to the mating nut, component design, and applicable fastener specification. Thread diameter, pitch, tolerance, and thread length must match the joint requirements.
Material and Surface Finish Options
Carbon steel and alloy steel may be selected according to the required mechanical properties and applicable product specification. Zinc plating and hot-dip galvanizing are potential finish options, subject to compatibility with the selected fastener grade and dimensions.
Custom Dimensions
Non-standard head dimensions, ribbed neck geometry, shank length, and thread length can be evaluated against an approved engineering drawing or physical sample before production confirmation.
Technical Specifications
|
Parameter |
Specification |
|
Product Type |
Ribbed Neck Carriage Bolt |
|
Head Style |
Domed Round Head |
|
Neck Design |
Ribbed Anti-Rotation Neck |
|
Thread System |
Metric or Inch-Series |
|
Metric Thread Sizes |
M6, M8, M10, M12, M16, M20 |
|
Inch Thread Sizes |
1/4", 5/16", 3/8", 1/2", 5/8", 3/4" |
|
Bolt Length |
20–200 mm |
|
Material |
Carbon Steel or Alloy Steel |
|
Inch-Series Grades |
Grade 5, Grade 8 |
|
Metric Property Classes |
Class 8.8, Class 10.9 |
|
Thread Types |
UNC, UNF, Metric Coarse, Metric Fine |
|
Surface Finishes |
Clear Zinc, Yellow Zinc, Black Zinc, Hot-Dip Galvanizing, Dacromet, Geomet |
|
Dimensional Inspection |
Head Diameter, Head Height, Shank Diameter, Overall Length, Thread Dimensions, Ribbed Neck Dimensions |
|
Mechanical Testing |
Tensile Strength, Proof Load, Hardness |
|
Quality Documents |
Material Certificates, Dimensional Inspection Records, Mechanical Test Reports |
Applications
Commercial Vehicle and Trailer Assemblies
Ribbed neck bolts may secure flooring or side panels to compatible supporting structures. Selection should account for panel material, hole geometry, vibration exposure, and joint loading requirements.
Agricultural Machinery
For equipment panels and structural attachments, verify that the ribbed neck engages with the mating component without damaging the substrate during tightening.
Wood-to-Metal Connections
The ribbed section may resist rotation when installed in a compatible prepared hole. Hole dimensions, timber properties, edge distance, and the risk of splitting should be considered.
Material Handling Equipment
For frames, enclosures, and related assemblies, evaluate fastener dimensions, strength requirements, coating compatibility, and installation access.
Key Selection Factors
Mating Hole Dimensions
Compare the ribbed neck's outside diameter and geometry with the specified hole dimensions. Excessive interference may damage the mating material, while insufficient engagement may allow the bolt to rotate during tightening.
Strength Grade and Joint Design
Select the fastener grade according to the required load, joint design, and governing specification. The nut, washers, mating components, and installation method must also be compatible with the selected grade.
Bolt Length and Thread Engagement
Specify the material thickness, grip length, nut dimensions, and required thread engagement. Confirm that sufficient usable thread is available without creating unnecessary protrusion or interference.
Corrosion Protection
Choose the surface finish according to moisture, chemical exposure, temperature, and other operating conditions. Hot-dip galvanizing can affect thread dimensions and may require compatible thread allowances. For high-strength fasteners, assess hydrogen embrittlement risks associated with the selected coating process.
Our Certificate
Frequently Asked Questions
Q: How does a ribbed neck carriage bolt resist rotation?
A: The ribs engage with the mating material or prepared hole to provide resistance while the nut is tightened. Actual performance depends on the neck geometry, hole dimensions, substrate, and installation conditions.
Q: Can ribbed neck carriage bolts be customized?
A: Custom dimensions can be evaluated using an approved drawing or sample. Confirm head dimensions, rib geometry, shank length, thread details, material grade, and surface finish before production.
Q: Are ribbed neck carriage bolts suitable for outdoor use?
A: They may be suitable when the material and surface finish meet the environmental requirements. Coating selection should account for moisture, chemical exposure, and compatibility with mating materials.
Q: What quality documents can buyers request?
A: Depending on the purchase specification and available quality procedures, buyers may request material certificates, dimensional inspection records, and applicable mechanical test reports.
Request a Technical Quote and Samples
To evaluate ribbed neck carriage bolts for your application, provide the following information:
Required Thread Size and Series: Metric, UNC, or UNF
Dimensions: Overall length, grip length, thread length, head dimensions, and ribbed neck dimensions
Material Grade and Standard: Specify the required grade and applicable product specification
Surface Finish: Zinc plating, hot-dip galvanizing, or another specified coating
Order Quantity: Estimated order quantity and purchasing schedule
Technical Documents: Engineering drawings in PDF, STEP, or DWG format
Sample Requirements: Specify whether samples are required for dimensional checks or assembly testing before production approval.
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