Flat Head Step Rivet
Products Description
A Flat Head Step Rivet is a precision riveting fastener with a stepped shaft structure. Its main body typically consists of:
Flat Head structure
Step Shank
Riveting tail structure
Positioning and mating area
Compared to ordinary solid rivets, step rivets can achieve multi-layered structural positioning and assembly mating through areas of different diameters, improving connection stability while effectively enhancing assembly efficiency and stress uniformity.
The flat head design facilitates quick positioning and maintenance operations with installation tools, making it more suitable for automated or semi-automated assembly environments.
Product Features
Multi-stage shoulder with integrated functionality
A single piece integrates a large-diameter locating shoulder, a small-diameter mating shaft, and a tail-end upsetting area, replacing the traditional multi-piece combination of "sleeve + pin + washer + screw," compressing interlayer spacing and structural connection into a single part.
01
Flat head and surface continuity
The top surface of the head is flush with or slightly recessed from the plate surface, eliminating protrusions and meeting the stringent requirements for surface contour continuity in fluid equipment, handheld panels, and sliding mechanisms.
02
Multiple engineering functions of the slot
Slotted Head Step Rivet serves as a metal flow compensation zone during cold heading, a posture orientation reference on the assembly line, and an anti-rotation interface after installation, achieving "one slot, three uses."
03
Axial metal flow line integrity
The multi-stage rod is continuously deformed by cold heading, with grains extending axially along each diameter segment. The transition zone between stages is not machined, resulting in ductile fracture rather than brittle disintegration under shear loads.
04
Adaptive layer thickness
By adjusting the axial length of each step, the Step Flat Head Rivet can precisely adapt to multi-layer riveting of plates from 0.5 mm thin plates to 6 mm thick plates without the need for additional shims.
05
Manufacturing Process: Multi-station Cold Forging and Micron-level Sculpting of Fracture Grooves
| Multi-station high-speed cold forging and stepped forming | Using a multi-station cold forging machine, coiled wire is subjected to forward and reverse extrusion to sequentially shape flat-head, slotted, large-diameter, and small-diameter rivets. The work-hardening effect endows the Slotted Flat Head Step Rivet shank with a dense microstructure and extremely high mechanical strength. The dimensional accuracy of the stepped transition zone is controlled at the micron level, ensuring a perfect fit with the sheet metal during riveting and preventing eccentric expansion. |
| Mandrel thread rolling and precision turning of fracture grooves | The mandrel's thread is crafted using a precision thread rolling process, resulting in a full tooth profile and extremely high engagement with the Flat Head Step Blind Rivet gun teeth, preventing slippage. The most crucial aspect is the machining of the fracture groove. A specialized forming tool is used to precisely control the groove depth and bottom radius, ensuring that the fracture torque difference of each mandrel is kept within an extremely narrow range. This is the core secret to achieving consistent riveting. |
| Automated assembly and online torque screening | The assembly of the mandrel and Flat Head Step Break-Stem Rivet body is completed in a dust-free automated workshop. Automatic orientation via a vibratory feeder allows the mandrel to penetrate the rivet body and be flared and locked. A tensile testing sensor integrated at the end of the production line provides 100% online monitoring of the mandrel pull-out force and fracture force of the rivets, automatically rejecting defective products with torque drift. |
Application Advantages: Irreplaceable Cross-Domain Integration
Automotive Body-in-White and Lightweight Hybrid Connections: In body structures combining steel, aluminum, and carbon fiber, dissimilar materials cannot be welded, and hole diameters often vary due to manufacturing processes. Flat Head Step Structural Rivets perfectly fit the different diameter holes in steel and aluminum. The flat head does not damage the carbon fiber's appearance, and blind-end expansion provides high shear strength, making them a core fastener for achieving lightweight multi-material connections.
Building Curtain Walls and Ventilation Ducts: Large-area thin-panel splicing requires extremely high surface flatness and wind vibration resistance. The flat head ensures the flush and aesthetically pleasing alignment of the curtain wall frame and decorative panels, while the stepped structure adapts to the mechanical characteristics of thicker frames and thinner decorative panels, providing vibration resistance and preventing loosening, ensuring structural safety under extreme wind loads.
Server Racks and Internal Electronic Equipment Components: In the confined space of server racks, cables and motherboards are densely packed. The flat-head design does not take up extra space, and the straight groove can serve as a positioning reference for wiring or labeling; the stepped riveting firmly locks the internal rails and brackets, withstanding the reciprocating shearing forces from frequent insertion and removal.
contact us
We not only offer standard Slotted Head Step Break-Stem Blind Rivet products, but also provide integrated engineering fastening solutions based on customer assembly structures, automation processes, and end-use environments, from material selection and structural optimization to mass production, helping projects achieve more stable and efficient mass production implementation.
Hot Tags: flat head step rivet, China flat head step rivet manufacturers, suppliers, factory, Hot Dip Galvanized Hex Nut, Hexagon Head Fange Bolt Screw, Hex Flange Weld Nut, Stainless Steel Hex Bolts and Nuts, Expansion Bolt Hook, Sealing Washers For Bolts
You Might Also Like
Send Inquiry