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Empower Off-Road Suspensions

Johnny Joints |
Rebuildable Flex Joints

Discover the Johnny Joint high-performance solution. Forged 4130 chromoly housing. Greaseable zerk fitting. Polyurethane or Delrin bushing. Fully rebuildable — 20 standard configurations, RH/LH and custom sizes, direct from the factory and shipping to the USA, Canada and worldwide.

See Size Chart ↓ Get a Quote
Two forged Johnny Joints rebuildable flex joints
4130 Chromoly
Forged housing & hard-chromed ball
Poly / Delrin
Replaceable bushing — fully rebuildable
20 Configs
SYZ-F001 → SYZ-F020 · RH/LH & custom
Zerk Fitting
Greaseable and field-serviceable
ISO 9001:2015 Certified
Factory Direct Pricing
15–30 Day Lead Time
Manufacturing Since 1999
OEM / ODM Customization

Design Concept

What Is a Johnny Joint / Rebuildable Flex Joint?

Unlike a sealed rod end, a flex joint is designed to be rebuilt. The forged housing retains a chromoly ball running on a replaceable polyurethane or Delrin bushing, and a zerk fitting lets you grease it in the field. When the bushing wears, you rebuild the joint instead of throwing the whole assembly away.

That is what makes it the default pivot for 4-link and 3-link off-road suspension, where high articulation and repeated impact destroy a conventional joint. “Johnny Joint” has become the widely used generic name for this style of rebuildable 4-bar joint; SYZ forged flex joints are a functional equivalent, made in our own factory.

Field Serviceability
Instead of discarding the entire rod end when the race wears out, you press in a new polyurethane bushing. On rock crawlers and trail rigs that see severe abuse, that is the difference between a consumable and a capital part.
A Bushing Joint, Not a Bearing
The ball rides on a compliant polymer bushing rather than a hard race, so the joint absorbs vibration and impact instead of transmitting it into the chassis — quieter and kinder to the link than a metal-to-metal heim.
Standard, Offset and Adjustable
Beyond the standard forged joint we also build offset-housing designs and adjustable spanner-nut covers, plus a weld-on rebuildable uniball version and a stainless variant for corrosive service.

Sourcing Challenges

Are You Struggling to Choose the Right Johnny Joints?

Choosing the right supplier is key to your success. We offer more than just Johnny Joints — we offer a partnership you can plan around.

Supply Chain Fluctuations
Disrupting your production plans and causing delays?
Product Consistency Issues
Quality varying across bulk-ordered parts, driving up your quality control costs?
Lack of Technical Support
Running into difficulties during product development and integration?
Seeking Exclusive Designs
Unable to find a partner who offers flexible, precise customization?

Why Choose Us

More Than a Manufacturer — Your Trusted Partner

By choosing our Johnny Joints, you gain:

Unparalleled Technical Expertise
Years in the off-road parts market mean we hold the core technology, and every product meets or exceeds the highest industry standards. Customization services cover the unique design requirements of your product line.
Stable Bulk Supply Capacity
A scaled production line and strict quality control processes get large-volume orders out on time, so supply chain problems do not become your problems.
Cost-Effective Long-Term Value
The rebuildable design significantly extends service life, cutting your inventory cost and your customers’ maintenance expense — which is business value you can quote against.
Professional Pre-Sales and After-Sales Support
Technical consultation, selection advice and after-sales service from an expert team, so the partnership runs smoothly from first enquiry onward.

About SYZ Machine

Forged Johnny Joints, Made In-House

SYZ Machine is a manufacturer of machinery and vehicle parts in China, and Johnny joints are one of our best-selling products. The housing and ball of our forged johnny joints are made from heat-treated 4130 chrome moly steel, and the bushing material can be polyurethane or Delrin to your requirement.

Beyond the standard johnny joints we also produce rebuildable flex joints with offset housing designs and adjustable cover designs. As a manufacturer we can customise deeply — material, surface treatment, logo, packaging — and we work with customers to upgrade the product over time, so our johnny joints get safer and longer-lived rather than staying still.

About SYZ → Manufacturing → Quality Control →
1999
Manufacturing Since
2,200 m²
Own Facility in Ningbo
20
Flex Joint Configurations
SYZ Machine quality certifications

Product Specifications

Johnny Joint Overview

Full Configuration Table →
SpecificationValueFeatures
Ball Dia.2.5″ / 2.0″ / CustomHigh-load spherical contact
ThreadRH / LH, custom available3/4″-16 · 7/8″-14 · 1″-14 · 1 1/4″-12
Articulation Angle10–20°Wide suspension travel
Offset Housing0° · 9° · 10°SYZ-F001 to SYZ-F004
GreasingZerk fittingServiceable in the field
RebuildableYesBushings & slips replaceable
FinishZinc / black oxideRust-proof and durable

Mounting width 7/8″ – 2-5/8″, bolt diameter 7/16″ – 3/4″, housing O.D. 2.1″ – 3″ across the 20 standard configurations. Full per-part dimensions in the size charts below.

Material and Finish Specification

ComponentMaterialFinish
Housing4130 heat-treated chromoly, forgedZinc plated, custom colour
BushingAs-molded polyurethane or DelrinWear-resistant, replaceable
Ball4130 chromoly steelHard chrome plated
Welded Rebuildable Uniball4130 chromoly steelHard chrome plated
Corrosion Resistant Johnny JointStainless steelPolished
Disassembled Johnny Joint showing ball, housing, bushings, washer and snap ring

Comparison

Flex Joint vs Sealed Rod End vs Poly Bushing

Three different answers to “how does this link pivot”. Pick on travel, service life and how much vibration you want reaching the chassis.

Joint StyleRebuildable?Articulation RangeRide Comfort / NVHBest Applications
Rebuildable Flex JointYes — replace the bushingHigh range of motionCompliant, dampens vibration and noiseHigh-wear 4-link and 3-link trail suspensions
Sealed Chromoly Rod EndNo — replace the whole assemblyHigh range of motionFirm, transmits metallic vibrationCompetition vehicles, race steering linkages
Standard Poly Bushing MountYes — replace the bushingLow range of motionHighly compliant, maximum NVH dampingStreet links, leaf spring shackle ends

If you land on the middle row, see chromoly rod ends; if you land on the bottom row, see forged poly bushings.

Bushing Material Guide — Polyurethane or Delrin?

Polyurethane bushings: firm, durable, and they damp road noise and vibration. The right pick for trail rigs, daily-driven off-road vehicles and 4-link rear suspensions. Used on SYZ-F001–F004 and SYZ-F015–F020.

Delrin bushings: extra firm, low friction and highly rigid, with effectively zero compression under load. The right pick for competition buggies and rock crawlers where you want the geometry to stay exactly where you set it. Used on SYZ-F005–F014.

Size Charts

Hot Selling Johnny Joints

The three most popular rebuildable flex joint families, with full size charts. Low MOQ · great price · high quality · custom service.

Polyurethane bushing forged Johnny Joint Round head Johnny Joint, white zinc plated Round head Johnny Joint
Polyurethane Bushing Forged Johnny Joint

SYZ-F001 to SYZ-F004 — Round Head Design

The round-head housing design with polyurethane bushings. Ideal for general suspension articulation needs. This is also the only family with a built-in offset housing angle — 0°, 9° or 10° — for links that need to clear a bracket or run off-axis.

Part No.Mounting Width WBolt Dia. BThread UNFThread Length CHousing O.D. DBushingOffset Angle
SYZ-F0012-5/8″9/16″1 1/4″-125″3″Polyurethane0
SYZ-F0022-5/8″9/16″1 1/4″-125″3″Polyurethane10
SYZ-F0032″7/16″7/8″-143.15″2.36″Polyurethane0
SYZ-F0042-5/16″9/16″7/8″-143.15″2.36″Polyurethane9
Delrin POM bushing forged flex joint Square head Johnny Joint
Offroad Forged Johnny Joint

SYZ-F005 to SYZ-F014 — Square Head Design, Delrin Bushing

The square-head housing design gives better grip during welding or adjustment. The Delrin bushing offers high precision and excellent wear resistance — the widest family in the range, covering mounting widths from 7/8″ up to 2-5/8″.

Part No.Mounting Width WBolt Dia. BThread UNFThread Length CHousing O.D. DBushing
SYZ-F0052-5/8″9/16″1 1/4″-123.5″2.68″Delrin
SYZ-F0062-5/8″9/16″1″-143.5″2.68″Delrin
SYZ-F0072-5/8″9/16″7/8″-143.5″2.68″Delrin
SYZ-F0081.6″9/16″1″-142.6″2.1″Delrin
SYZ-F0091.6″9/16″7/8″-142.6″2.1″Delrin
SYZ-F0101.6″9/16″3/4″-162.6″2.1″Delrin
SYZ-F0111.6″7/16″1″-142.6″2.1″Delrin
SYZ-F0121.6″7/16″7/8″-142.6″2.1″Delrin
SYZ-F0131.6″7/16″3/4″-162.6″2.1″Delrin
SYZ-F0147/8″3/4″3/4″-162.6″2.1″Delrin
Adjustable Johnny Joint rebuildable flex joint Lock nut enhanced Johnny Joint design Lock nut enhanced Johnny Joint design detail
Adjustable Johnny Joint Rebuildable Flex Joint

SYZ-F015 to SYZ-F020 — Lock Nut Enhanced Design

These models feature a threaded stainless spanner lock nut design, making installation and future disassembly considerably more convenient — the family to specify if the joint will be rebuilt often rather than occasionally.

Part No.Mounting Width WBolt Dia. BThread UNFThread Length CHousing O.D. DBushing
SYZ-F0152-5/8″9/16″1 1/4″-123.5″2.68″Polyurethane
SYZ-F0162-5/8″9/16″1″-143.5″2.68″Polyurethane
SYZ-F0172-5/8″9/16″7/8″-143.5″2.68″Polyurethane
SYZ-F0182-5/8″5/8″1 1/4″-123.5″2.68″Polyurethane
SYZ-F0192-5/8″5/8″1″-143.5″2.68″Polyurethane
SYZ-F0202-5/8″5/8″7/8″-143.5″2.68″Polyurethane

All dimensions in inches. Housing: 4130 heat-treated chromoly steel, zinc plated — custom sizes and RH/LH available. Ball: 4130 chromoly, hard chrome plated. Available in male thread and weldable sleeve; inner configurations can be customised with threaded spanner nuts or standard steel balls with different spacers. Filter and quote by part number on the rebuildable flex joint spec page, or browse every flex joint product.

Service Parts

Johnny Joint Rebuild Kit

Replace worn bushings, balls and hardware without buying a new joint. Available in polyurethane, Delrin (POM) and high-misalignment chromoly ball configurations. Custom kit sizes supported.

Adjustable Johnny Joint rebuild kit
Adjustable Rebuild Kit
A machined end ring that allows easy tightening or rebuilding when necessary.
Weld-on rebuildable uniball Johnny Joint
Rebuildable Uniball
Weld-on Johnny Joint rebuild joint — see also uniball cups.
Polyoxymethylene bushing rebuild kit
Polyoxymethylene Bushing Rebuild Kit
Custom rebuild kit configurations available.
Delrin POM bushing rebuild kit
Delrin (POM) Bushing Rebuild Kit
With high-misalignment chromoly steel ball.
Polyurethane bushing rebuild kit
Polyurethane Bushing Rebuild Kit
For offset-angle housings.
Request Rebuild Kit Quote

Applications

Johnny Joint Application

Where high articulation meets repeated impact — and where a sealed joint would not survive the season.

Johnny Joint on off-road control arm Control arms fitted with Johnny Joints
Off-Road Vehicle Manufacturers & Modifiers
For critical components such as suspension systems, control arms and tie rods. See off-road applications.
Mine truck linkage using rebuildable flex joints Track bar fitted with a Johnny Joint
Heavy Machinery & Engineering Vehicles
For demanding conditions in agriculture, construction and mining — loaders, bulldozers, excavators, dump trucks and mining trucks.
Military vehicle using rebuildable flex joints Suspension links fitted with Johnny Joints
Military & Special Purpose Vehicles
For reliable components that must withstand extreme environments and long service intervals.

Fitment

Johnny Joints for Jeep Track Bars and Control Arms

The applications our customers build most often. Tell us the platform and the arm, and we will match the housing thread, mounting width and bolt diameter for you — then supply the chromoly tube and weld-in adapters to finish the link if you want the whole assembly from one source.

TJ Adjustable Front Track Bar JK Front Track Bar XJ / ZJ Adjustable Front Track Bar TJ Adjustable Rear Track Bar JK Lower Adjustable Control Arms JK 4-Link Control Arms JK Radius Long Arms JK Upper & Lower Control Arms TJ / LJ / KJ / MJ / ZJ Upper & Lower Control Arms TJ / LJ / XJ / ZJ Front Upper & Lower Control Arms TJ / ZJ Rear Upper & Lower Control Arms
Johnny joint application on linkage rods

FAQ

Common Questions

What is a Johnny Joint / rebuildable flex joint?
A rebuildable, high-misalignment joint for 4-bar suspension. The chromoly ball runs on a replaceable polyurethane or Delrin bushing, so a worn joint is rebuilt rather than replaced. “Johnny Joint” is a common generic name for this style of bushing joint.
Can Johnny Joints be rebuilt or serviced?
Yes. Many models feature a serviceable design with replaceable bushings and ball surfaces, allowing easy maintenance and extended product life. The SYZ-F015 to SYZ-F020 family adds a threaded spanner lock nut specifically to make repeated rebuilds easier, and rebuild kits are available separately.
What are they made of?
A forged 4130 heat-treated chromoly housing, zinc plated, with a hard-chrome-plated 4130 chromoly ball and a polyurethane or Delrin bushing. A weld-on rebuildable uniball version and a polished stainless version for corrosive service are also produced.
Polyurethane or Delrin bushing — which should I choose?
Polyurethane is compliant and damps noise and vibration — better for trail rigs and daily-driven vehicles. Delrin is firmer, lower friction and effectively non-compressing — better for competition buggies and rock crawlers where you want the geometry to hold. SYZ-F001–F004 and F015–F020 use polyurethane; F005–F014 use Delrin.
What size and offset should I choose?
Match three things to your bracket and link: mounting width (7/8″ to 2-5/8″ across the range), bolt diameter (7/16″ to 3/4″) and housing thread (3/4″-16, 7/8″-14, 1″-14 or 1 1/4″-12). Offset housings — 9° and 10° — are available in the SYZ-F001 to SYZ-F004 family for links that need to run off-axis; everything else is a straight 0° housing. Send us your geometry and we will pick the part number.
Which machines or vehicles typically use Johnny Joints?
They are commonly used in loaders, bulldozers, excavators, dump trucks, mining trucks and heavy-duty suspensions where high articulation and vibration resistance are required — plus Jeep track bars and control arms, rock crawlers, pre-runners and UTV builds.
Do you provide OEM / ODM customization?
Yes. We support OEM branding (logo laser marking, etching or engraving), customized structures, custom materials and surface treatments, and packaging options to meet your requirements. Inner configurations can be customised with threaded spanner nuts or standard steel balls with different spacers.
How do you ensure product quality?
We have strict quality control processes in place from raw material sourcing through production to final inspection. All products undergo 100% quality inspection before leaving the factory.
How can I track the progress of my order?
Once your order is confirmed and enters production we provide regular progress updates. You can also contact our customer service team by email or phone for the latest status and delivery information.
How do I place an order?
Two ways. Contact our sales team directly with your requirements or design drawings and we will prepare a quotation and lead time. Or submit your request through the form below and we will reply within 24 hours.

Factory Direct

Send Your Johnny Joint Inquiry

Leave your request details — part numbers, housing thread, mounting width, bolt diameter, quantities — and we reply within 24 hours.

We reply within 24 hours · Factory direct · Or email [email protected]

Request a Quote

Please submit the form or email [email protected]

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