Frequently Asked Questions

We were established in 1999 as Shanghai Yong Zheng Bearing Co., Ltd. and rebranded as SYZ Machine in 2012. With over 26 years of experience, we supply precision vehicle parts and accessories to customers worldwide.

Our 35,000 m² modern facility is equipped with CNC machining centers, lathes, grinders, and injection molding equipment. We produce more than 15,000 parts daily, covering both small-batch development runs and bulk production.

We specialize in off-road, UTV/ATV, race car, motorcycle, golf cart/go-kart, and watercraft components, spanning suspension, steering, drivetrain, and body applications.

We have shipped to more than 20 countries, including the USA, Germany, Brazil, Canada, Australia, and Japan, delivering parts and accessories to global markets.

Yes. We provide 24/7 customer support, technical assistance, and logistics handling to make sure your parts arrive safely and perform reliably after delivery.

We follow strict QC processes at every stage of production, and our factory is certified to ISO 9001, SGS, and RoHS standards. All parts are tested to meet or exceed international requirements before they ship.

We accept STEP, IGES, DWG, and PDF drawings, and we can also work directly from a physical sample if you don’t have CAD files on hand.

Yes. Send us the physical part or sample and our engineering team will reverse-engineer it, flag any structural improvements, and produce prototype samples for your approval — the same process we use to take customers from zero files to stable mass production.

Yes, this is a routine part of our process. In one documented case, a customer supplied only an OEM part with no drawings; our team reverse-engineered it, improved the structure, and moved from sample approval to a 50-set first order and then to 3 SKUs in stable repeat production.

Engineering evaluation and an initial quotation are typically completed within 2–3 business days of receiving your drawings or samples, and some product lines commit to a 24-hour turnaround. Complex custom development (DFM review, material sourcing) can take a little longer.

Yes. We understand the importance of protecting proprietary designs and are prepared to sign your NDA for custom projects before analyzing any files, so your drawings stay confidential from the first submission.

Yes. If you don’t have technical drawings yet, our engineering team can assist with spec development based on your target application, vehicle platform, and reference information before we move to quoting.

Yes, for critical or high-load builds we can provide FEA stress simulation references, DFM feedback, and drawing review — we aim to act as a technical partner during development, not just a part supplier.

It depends on the part: simple hardware and limit-strap samples typically ship in 5–7 business days, while more complex assemblies such as ball joints or steering wheels run 3–4 weeks. We confirm a specific sample lead time once we’ve reviewed your drawing.

MOQ varies by product. Standard catalog parts generally start around 50 pieces or a $500 minimum order value. Ball joints and similar model-specific components typically start at 100 pieces per model. CNC billet-machined parts can start as low as 10–20 sets due to setup cost, while welded assemblies start around 50 sets, and bulk items like wholesale limit straps start at 200 sets. Send us the specific part and target volume for an exact number.

We accept payment by wire transfer or PayPal. Common terms are 30% deposit in advance and 70% balance before shipment; special terms can be discussed for established partners.

Yes. We provide samples for evaluation so you can confirm quality, dimensions, and performance before placing a bulk order. A sample fee may apply on some product lines but is typically refunded once the official order is confirmed.

Standard production lead time runs roughly 30–45 days from final drawing or sample approval and deposit, depending on part complexity, tooling, and surface treatment. Machined hardware and steering wheels typically run 3–5 weeks, and welded or bulk-strap programs run 4–6 weeks.

Yes. As a direct factory we offer tiered pricing by volume and can provide low-MOQ samples for quality and fitment testing, so new brands can start a private-label product line with minimal inventory risk.

Contact us directly through our website or sales team with your part requirements and target quantity. We support wholesale orders with flexible MOQ depending on the part type.

Yes, expedited production can be arranged on request — share your timeline requirements when you submit your inquiry and we’ll confirm whether a rush schedule is workable for that part.

Multi-SKU orders are assessed model by model rather than against a single blanket minimum, so mixed-model orders have some flexibility. Contact us with your SKU list for a combined quote.

Our core materials are 6061-T6 and 7075-T6 aluminum, 4130/4140/4340 chromoly and alloy steel, DOM steel, and stainless steel, with titanium available for weight-critical or corrosion-critical parts. Material choice is matched to load, weight target, and application environment.

6061-T6 has a tensile strength of roughly 310 MPa and is a strong, cost-efficient choice for street performance and most aftermarket parts. 7075-T6 reaches about 572 MPa — around 85% higher — and is our recommendation for motorsport and heavy-duty applications where maximum strength-to-weight matters most; it costs more and is the standard material for premium performance products.

4130 chromoly offers a higher strength-to-weight ratio and better fatigue resistance under repeated high-impact loads, which is why we specify it for racing-grade radius rods, A-arms, and control arms. DOM steel is offered as a mid-point option where a customer wants a performance-to-cost balance rather than full chromoly.

Typical CNC tolerance on critical dimensions such as bore, thickness, and bolt circle diameter is ±0.02mm, with bore-specific work such as shock eyelets held to ±0.01mm where required. General machining tolerance runs to IT6–IT7 grade with straightness controlled to ≤0.05mm; tighter tolerances can be discussed for specific applications.

Standard production achieves Ra ≤ 0.2μm; a precision option at Ra ≤ 0.1μm is available for applications that need tighter seal compatibility or lower-friction surfaces.

Standard hard chrome plating is controlled to 15–30μm thickness, achieving HV 800–1200 surface hardness, with chrome adhesion tested on every production batch.

We offer standard and hard anodizing (hard anodizing typically reaches roughly HRC50 surface hardness), zinc plating for steel components, and E-coating for uniform coverage on complex geometries, with custom anodize colors available for branding.

Coilover and adjustable-length hardware is typically machined with ACME or trapezoidal thread profiles, which give higher load capacity, smoother adjustment, and better vibration resistance than standard V-thread profiles. Interference fit classes such as H7/K6 and H7/M6 are available where zero-play rotation is required.

Not all studs are rated the same: budget hardware often uses Grade 8.8 studs (about 800 MPa tensile), while our standard is Grade 12.9 (≥1,220 MPa tensile, fatigue-rated to ≥2,000,000 stress cycles). Wheel studs see repeated tension and bending in use, so it’s a fatigue application — stud grade is what determines how long the connection lasts before micro-cracking begins.

Yes. Material certificates, hardness test reports, and dimensional inspection records are available on request, and for larger or ongoing orders we provide batch-level documentation as standard.

Our factory is certified to ISO 9001:2015 and SGS, with products also tested to RoHS requirements, giving customers documented assurance of process and material compliance.

Our QC runs in stages: raw material inspection, CNC precision and dimensional checks, fitment/bolt-pattern testing, surface finish inspection, and a final assembly and functional check before packing — every batch passes through each stage before it ships.

Yes. Every new part goes through first article inspection and sample approval before any mass production run begins, so there’s no dimensional drift or surprise once the batch ships.

CMM (coordinate measuring machine) inspection uses 3-coordinate measurement to verify critical geometry with high precision. We run CMM checks on new parts and on request for ongoing production to confirm dimensions match the approved sample.

Yes. Dimensional inspection reports, hardness reports, and surface roughness verification are available on request for each production batch, giving your incoming QC team documentation rather than verbal assurances.

Where the application calls for it, yes — for example, every set of limit straps is 100% load tested and rated to a specific breaking strength, with QR-based traceability carried through to shipment.

Yes. We offer laser engraving or embroidery for logos, part numbers, or batch codes, along with custom branded packaging — this is a standard part of our OEM service, not an add-on.

Yes, including neutral packaging and Amazon-ready packaging options. Artwork turnaround is typically about 2 weeks after your artwork is approved.

Yes. We can coordinate custom retail boxes, inserts, and label design so the product arrives shelf-ready and requires no secondary packaging work on your end.

Several of our custom product lines (steering wheels, camber plates, shock eyelets, steering racks) are B2B and OEM manufacturing only — we do not fulfill single-piece retail orders on those lines. Other catalog product lines do support smaller trial orders; ask us about the specific part you need.

Yes. We support tiered pricing based on volume and can supply low-MOQ samples for quality and fitment testing, so new brands can validate a product before committing to a larger inventory position.

Send your logo in vector format (AI, EPS, or DXF), the target part, and your packaging requirements (retail box, neutral, or private-label). We’ll confirm engraving placement, packaging options, and turnaround with the quote.

Yes. We have shipped to more than 20 countries and our logistics team arranges international shipping and assists with customs documentation so parts reach your warehouse or port reliably.

Off-road vehicles, UTV/ATV, race cars, motorcycles, golf carts and go-karts, and watercraft are our core markets, with suspension-related hardware also reaching agricultural, industrial, and fitness-equipment applications where similar linkage and load-bearing components are used.

We supply parts for platforms including Jeep Wrangler, Ford Bronco, Toyota Tacoma TRD Off-Road, Chevrolet Silverado ZR2, Ram TRX, Land Rover Defender, Nissan Navara, and Mitsubishi Outlander (Ralliart), among others — contact us to confirm an unlisted model.

Core platforms include the Polaris RZR family (Pro XP, XP 1000, Turbo S, General, Ranger), Can-Am Maverick X3 and Defender, Yamaha YXZ, and Honda Talon, plus custom development for any other UTV or ATV platform from drawings or a sample.

Our race car parts are compatible with a wide range of vehicles including Porsche, BMW, Ford, and Chevrolet — contact us to confirm compatibility for other makes and models.

We supply motorcycle parts for popular models such as the Harley-Davidson Iron 883, Ducati Monster, Honda Grom, Yamaha MT-09, and Suzuki Hayabusa, along with fully customized parts based on your drawing or sample.

We supply parts compatible with TrailMaster, Club Car, E-Z-GO, and Yamaha platforms, and can confirm compatibility for other models on request.

We supply parts for yachts, jet skis, and fishing boats; if your model isn’t listed, contact us and we can confirm compatibility or develop a custom part.

COM-T uses a bonded PTFE liner and is completely maintenance-free, which suits performance and motorsport suspension where re-lubrication isn’t practical. GE series is steel-on-steel with grease lubrication, giving higher static load capacity at a lower cost, and is preferred for heavy-duty applications with accessible lubrication points.

Yes, we support full drawing-based custom production. Submit your bore diameter, outer diameter, width, clearance specification, and material requirement, and our engineering team will respond within 24 hours; small-batch prototypes are available before a volume commitment.

It’s a bearing with modified inner-race geometry that allows greater angular deflection than a standard COM-T or GE series bearing. This matters for long-travel off-road suspension, where a standard bearing would bind or generate internal stress at full droop or compression — often paired with misalignment spacers.

We offer F1 (tight — racing/low play), F2 (standard — performance suspension), and F3 (looser — heavy-duty/high load). The right choice depends on application load, housing tolerance, operating temperature, and noise requirements; share your housing bore spec and we can recommend a grade.

The standard outer ring is 35CrMo or 40Cr alloy steel, heat-treated and precision ground; the inner ball is GCr15 bearing steel, with a hard chrome option for higher load and corrosion resistance. Stainless steel construction is available for marine or chemical environments, with phosphate, zinc, and black oxide surface treatments offered.

Yes. We help with housing tolerance recommendations, outer-diameter adjustment for press-fit specification, and clearance-grade selection based on your assembly requirements — this is included as standard OEM cooperation, not billed separately.

Yes, including customer-specified part numbers, drawings, and packaging requirements, plus private-label packaging with custom branding for customers building an ongoing product line rather than a one-time order.

A tie rod end is a steering component made up of a threaded rod, ball joint housing, ball stud, dust boot, clamp ring, castle nut, and cotter pin. It sits at each end of a rack-and-pinion steering rack, connecting the rack to the steering knuckle — this is normally called the outer tie rod end.

Common symptoms are a vibrating or shaking steering wheel, a misaligned front end, abnormal clunking noise, uneven tire wear, and difficulty steering — any of these is worth a steering-system inspection.

They belong to different systems. Ball joints are part of the suspension system and support vehicle weight while allowing the wheel to turn and articulate; tie rod ends are part of the steering system and keep the wheels aligned. Both connect to the spindle and work together — the tie rod can’t function without the ball joint also doing its job.

Some designs need periodic greasing to reduce friction between the ball stud and bearing. SYZ Machine’s tie rod ends are greased and sealed at the factory, so they don’t require additional maintenance in service — we still recommend checking steering components regularly and replacing them if steering feel becomes unusual.

Minimum order quantity is 100 pieces per model. For multi-SKU orders, each model is assessed individually, so mixed-model orders have some flexibility — contact us for that discussion.

Yes, 300M is available as an upgrade on most models and fits the same housing as the standard grade. Just specify it when requesting a quote and we’ll confirm dimensional compatibility and pricing.

TitanX is our modular composite ball joint, conceptually similar to a Keller-style ball joint system. It uses a multi-piece precision assembly that allows higher articulation angles and field-replaceable internals, and it’s built for extreme off-road builds and custom OEM applications where a standard cartridge ball joint isn’t enough.

We produce full custom steering rack and pinion systems — housing, rack shaft, pinion gear, sealing system, mounting brackets, and input shaft interface — assembled and tested as a complete, installation-ready unit, not sold as loose components.

Heavy-duty upgraded racks use a reinforced rack shaft in 4140/4340 alloy steel, a hardened and ground pinion gear, a heavy-duty housing, and upgraded sealing for extreme off-road conditions; gear ratio can also be optimized for oversized tires or modified suspension geometry.

Control arms allow the suspension to move vertically while connecting the chassis to the wheel assembly or steering knuckle, maintaining constant tire contact and stability as the suspension reacts to uneven terrain.

In front suspension systems, a control arm is frequently called an A-arm because of its shape — it’s the same structural link connecting the chassis to the wheel assembly or steering knuckle, just named after its geometry.

It depends on the suspension configuration. In rear suspension layouts, trailing arms can function as control arms; front suspensions typically use A-arm geometry instead of the linear trailing-arm design found at the rear.

Watch for clunking or popping noise over bumps, reduced steering precision or wandering, uneven or accelerated tire wear, and noticeable vibration or chassis shudder — these point to worn bushings, a failing ball joint, or structural damage to the arm itself.

The RZR XP 1000 front suspension uses a dual A-arm configuration (left and right) paired with two high-clearance radius rods, with a four-link radius rod assembly at the rear. The Maverick X3 front uses two A-arms with four high-clearance radius rods, and the rear uses a four-link or six-link radius rod setup depending on model and trim.

Unlike passenger-vehicle mileage intervals, UTV components see extreme off-road stress, so replacement should be based on structural inspection during scheduled maintenance rather than a fixed mileage number — replace promptly if any bad-control-arm symptoms appear.

Yes. We also produce ball joints and bushings, so we can supply matched sets based on your request rather than leaving you to source wear components separately.

Welded (tubular or boxed) A-arms start at 50 sets. CNC billet-machined A-arms have a lower MOQ, around 10–20 sets, because the setup-intensive CNC process makes small runs more economical — this makes billet A-arms a good fit for prototype development and niche builds.

Rubber (OEM-standard, best NVH absorption for street/daily use), polyurethane (most popular for off-road/performance, more durable and firmer), and Delrin/acetal (rigid, zero compliance, the standard for racing suspension) — we supply all three, matched to your application.

A radius rod is a rear suspension link that connects the chassis to the rear hub assembly, maintaining wheel alignment, controlling fore-aft axle movement, and stabilizing the vehicle under off-road stress. When an OEM radius rod bends or fails, it directly affects handling, tire wear, and safety.

Yes, in-stock kits are engineered as direct bolt-on replacements using OEM mounting points and thread specifications, with no vehicle modification required. Rod geometry maintains factory suspension alignment while solid billet construction and upgraded end joints add strength over the standard part.

XM Series uses a single-body ladder-slot design that’s compact and well-suited to standard OEM replacement. JMX Series is a 3-piece rod end offering greater structural strength, making it the preferred choice for performance builds and higher-load applications. Both are manufactured in-house, precision ground, and replaceable as standalone components, so a worn rod end doesn’t mean replacing the whole rod.

Yes, pillow-ball camber plates are one of our core configurations — the standard choice for performance coilover systems that need precise, repeatable camber-angle adjustment. We manufacture the plate body and source compatible pillow-ball assemblies to your specification.

Adjustable designs (pillow-ball type and slotted mounting) are available depending on your suspension geometry, and fixed-angle camber plates are also available for OEM applications where the angle is set at the design stage.

We primarily use ACME and trapezoidal thread profiles for coilover sleeves and adjusters, which give higher load capacity, smoother adjustment rotation, and better vibration resistance than standard V-thread profiles; custom pitches and tolerance classes are available.

We routinely achieve ±0.01mm bore tolerance for precision bushing and bearing press-fit applications, with every bore inspected against your specified tolerance using precision gauging before shipment.

Limit straps control suspension extension (droop) and engage before full extension to prevent overextension damage to shocks, CV joints, and control arms. Bump stops absorb compression forces instead. They serve different purposes, and many serious off-road builds use both together.

Our heavy-duty limit straps use reinforced multi-layer industrial stitching and are rated up to 25kN breaking strength, with every set 100% load tested and carrying QR-based traceability before shipment.

We manufacture both. Hub-centric spacers are precision machined to match your vehicle’s exact center-bore diameter, which eliminates vibration and ensures proper load distribution — we recommend hub-centric for high-speed and performance applications.

Our CNC centers hold ±0.02mm on critical dimensions such as thickness, center bore, and bolt circle diameter, with tighter tolerances achievable if your application requires it; every dimension is verified with precision measuring equipment before shipment.

Yes. Center bore (hub-lip outer diameter) is machined to ±0.02mm to match your specific vehicle hub OD, and bolt pattern (PCD) and stud count are fully customizable, including adapter configurations where the vehicle-side and wheel-side PCDs differ.

Standard hub-centric spacers use a single-diameter lip that centers against either the vehicle hub or the wheel bore, not both. A multi-stage design uses stepped geometry that engages both simultaneously, tightening concentricity and reducing runout — the practical result is zero vibration even on wheels with slightly larger wheel-side center bores.

No. Pockets are positioned away from all structural load paths — the hub-lip engagement zone, stud-seating surfaces, and the perimeter ring that carries lateral load stay at full material thickness, with structural ribs maintaining lateral stiffness. Pocket placement is FEA-validated, and the load rating matches the solid version even though roughly 30% of the weight is removed.

Grooves machined into the spacer’s outer face create a pumping effect as the wheel rotates, drawing cooler air across the brake rotor and hub assembly. This measurably reduces brake-zone heat buildup in track-day and motorsport use, and also reduces thermal soak into the hub bearing on the street; groove count, depth, and pattern are all customizable.

Yes. If you have an existing spacer that fits correctly, send it to us and we’ll reverse-engineer it, produce drawings for your approval, and manufacture identical units — useful when drawings aren’t available but you need a consistent reproduction.

Typical MOQ for standard configurations is 100–500 sets. Fully custom specifications that require new tooling may need a higher minimum, though a small prototype batch (around 5–10 sets) can usually be produced first for dimensional verification and fit approval.

No. We specialize in structural and external suspension components only — piston rods, sleeves, bearings, bump stops, mounts, and boots. We do not manufacture hydraulic internal valve systems or assemble complete shock absorber units.

Standard production achieves Ra ≤ 0.2μm, with a precision option at Ra ≤ 0.1μm available for applications that need tighter seal compatibility or lower friction.

Standard hard chrome plating is controlled at 15–30μm thickness, reaching HV 800–1200 hardness, with adhesion tested on every production batch.

Yes. Production is fully drawing-based — we accept any thread specification and custom length or diameter, generally within a 12.5–32mm diameter range for piston rods, plus matching lock collars, spring perches, and lower spring retainers for coilover sleeves. Submit your drawings for engineering review.

The most common sizes are 330mm and 350mm, but we manufacture any size from 300mm to 380mm depending on driving style and cockpit ergonomics — racing builds often prefer smaller diameters for faster steering response.

No. Fitment depends on bolt pattern, hub-bore size, spline specification, and vehicle type, so a wheel specified for one UTV platform won’t fit a different one without adaptation — each product is engineered to your specific vehicle application.

It’s not recommended. Passenger-car steering wheels aren’t designed for off-road vibration, shock loads, and grip conditions, and typically use different bolt patterns and hub sizing. Our steering wheels are engineered specifically for ATV/UTV applications and off-road use.

Aluminum, steel, and carbon fiber for the structural components, with grip options in PU foam, genuine leather, and suede in smooth, textured, or perforated finishes — material selection is based on your strength requirement, weight target, and price point.