Every automotive electrical assembly ends at the same point: two or more parts that must stay locked together for the life of the vehicle. Threaded fasteners loosen. Adhesives age. Welds distort thin-gauge housings. That is why so many of the small joints inside a seat adjustment motor, a wiper linkage or a switch housing are still closed with a cold-headed rivet — a single piece of formed metal that needs no torque spec, no thread locker and no re-inspection after twenty thousand vibration cycles.
Wuyuan Joy Automobile Electric Appliances Co., Ltd. has been making those joints since January 2010. We produce solid rivets, tubular rivets and custom cold-headed components in volume for OEM programs and the aftermarket, alongside our automotive micro-motor lines. This article explains what our rivet range is built to do, how it is controlled in production, and where it fits on a vehicle.
What the Product Range Looks Like
The rivets in our current catalog are cold-headed from metal wire in a single continuous forming operation. What that produces is visible on the part itself: a bright, uniform metallic finish across the entire body, a straight cylindrical shank with no seam or joint line, and a formed head with a clean, square edge where it meets the shank. Our photography shows several head profiles in the same family — a low flat head, a slightly domed pan-style head, and a wider flange-style head for load spreading on softer materials.
Shank lengths vary across the range, from short studs intended for stacked thin-plate joints to longer bodies sized for through-hole assembly in motor end caps and bracket plates. One variant in the range is formed with a hollow bore at the tail end — a tubular rivet designed to be rolled or flared over on the far side of the joint rather than upset into a solid head. That distinction matters at the design stage, because tubular rivets set at far lower force and are the right choice where the mating part is ceramic, plastic or a thin electrical laminate that cannot take a solid upset load.
All shapes share the same forming logic: the head is created by compressing the wire end in a die, not by machining it away. No chips, no cut grain, no wasted material.
Why Cold Heading Beats Machining for Fastener Volume
Cold heading does three things that machined fasteners do not.
Grain flow follows the shape. When the wire is upset into a head, the metal's internal grain structure bends around the head-to-shank transition instead of being cut across it. That continuous grain is what resists head shear and shank fatigue in a part that will live its whole service life under vibration.
Cycle time is measured in parts per second, not minutes. A cold header forms a rivet in one or two blows. For a buyer specifying 200,000 pieces a quarter, that difference in process is the difference between a viable landed cost and a quote that never gets approved.
Tolerances hold across the run. Because the die cavity does not wear the way a cutting tool wears, the thousandth piece measures like the first. We hold h6/h7 grade tolerances on the shank diameter, and every production lot passes through 100% optical sorting so that dimensional outliers and head defects are removed before packing rather than found on your assembly line.
Applications: Where These Rivets Actually Sit
Our fasteners are developed alongside the micro-motor programs we already supply, which means we know the joint from the inside.
Seat adjustment motors. Rivets fix the gearbox cover to the housing, retain the brush plate, and secure the motor can to the end cap. These are permanent joints in a part that will cycle tens of thousands of times over a vehicle's life, and they sit within centimeters of the occupant.
Wiper motors and linkage. Link pivots, armature retention and housing closures rely on solid rivets that must hold preload without loosening through thermal cycling and water exposure.
Electrical terminals, contacts and switchgear. Solid rivets give a metal-to-metal joint with defined contact area — useful where a bolted connection would work loose or where a screw head would foul a moving contact.
Brackets, hinges, latches and trim hardware. Wider flange heads spread clamp load across thin-gauge steel and plastic panels, avoiding the pull-through that a small-head fastener causes.
Beyond automotive, the same cold-headed capability serves appliance, power tool, electrical equipment and general industrial assembly programs where a permanent mechanical joint is preferred to a threaded one.
The Plant Behind the Part
Our facility in Wuyuan County, Jiangxi Province covers 10,000 square meters and runs at a stable daily output of 1.5 million pieces. We operate as a direct manufacturer rather than a trading house, which means a drawing change, a tolerance question or a capacity request is answered by the people who own the tooling.
Quality management is certified to IATF 16949 and ISO 9001. In practice that means documented process control, traceability by lot, PPAP-ready documentation for new programs, and a measurement regime built around the tolerances the drawing actually calls for. We supply tier-one and vehicle-manufacturer programs including SAIC, Geely and Chery, and the discipline those customers require is the same discipline applied to every export order, whatever its size.
Our product development work is concentrated in three areas: seat adjustment motors, wiper motors, and custom cold-headed fasteners. We take on custom profiles — head geometry, shank diameter and length, material grade, and the tail form (solid upset or tubular flare) — and we develop the die to match.
Industry Insight: Why Fastener Consolidation Is Happening Now
Three pressures are reshaping how buyers source small fasteners.
Supplier count reduction. Purchasing teams are collapsing long fastener lists into fewer approved suppliers who can cover rivets, cold-headed pins and motor assemblies under one quality system. A vendor that already holds IATF 16949 and ships to OEM lines removes an audit cycle from the buyer's schedule.
Lightweighting and thin-gauge construction. As housings get thinner, joints get more sensitive to clamp load. Wider flange heads and correctly specified tubular rivets are increasingly chosen over standard solid profiles for exactly this reason.
Electrical content growth. More motors, more actuators, more sensors — every added electrical function means more small permanent joints inside a housing that cannot be serviced. A rivet that fails is not a warranty repair; it is a replaced assembly. That raises the bar on first-pass yield and on dimensional consistency, which is why optical sorting at 100% has moved from a premium option to a baseline expectation.
Working With Us
Send a drawing, a sample, or a joint description and we will come back with a manufacturable profile, a material recommendation and a production plan. Custom cold-headed development is our core work, not a side offer.
Wuyuan Joy Automobile Electric Appliances Co., Ltd.
Precision automotive micro-motors and cold-headed fasteners
IATF 16949 | ISO 9001 | h6/h7 tolerances | 100% optical inspection
Website: www.jieyimotor.com
Visit the site to review the full rivet and motor range, then contact our team with your specification. We will tell you plainly whether our process fits your joint, and if it does, we will build the tooling and hold the tolerance.
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