1550 Universal Joint | Class 5-6 Medium-Duty U-Joint Cross Kit (42×104.5mm)
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| Dimension | Metric | Imperial | Notes |
|---|---|---|---|
| A — Cap Outer Diameter | 42 mm | 1.654″ | Bearing cap OD; determines yoke bore size |
| B — Snap-Ring Span | 104.5 mm | — | Outside face to outside face across opposite caps |
| C — Groove Width | 1.75 mm | — | Snap-ring (circlip) seat width |
| Peak Torque Capacity | 1250 Nm | At 0° operating angle | |
| Max Operating Angle | 30° | Continuous duty | |
| Material | Case-hardened Cr-Mo alloy steel | Surface HRC 58–62 | |
| Grease Fitting | 1/4-28 UNF Zerk (greaseable) | Non-greaseable sealed version available | |
| Surface Finish | Manganese phosphate + oil | 240 h salt-spray resistance | |
| OEM Cross References | Spicer 5-1550X | Dana 1550 | Moog — | ||
What Is the 1550 Universal Joint?
Precision-engineered to SAE 1550 series specifications, the 1550 universal joint (Jiukai model 42.01) is a direct OEM-grade replacement cross kit designed for demanding driveline applications. With a cap outer diameter of 42 mm (1.654″) and a snap-ring span of 104.5 mm, this cross kit installs directly into any yoke or flange engineered for the 1550 envelope without shimming, machining, or modification.
All three OEM references — Spicer 5-1550X, Dana 1550, and Moog — — share exactly the same SAE 1550 series dimensional envelope. Our Jiukai 42.01 is manufactured to the same standard and installs without modification into any yoke or flange originally engineered for those references. When you order from universaljoint.net, you receive a part whose every critical dimension has been independently verified against the SAE 1550 specification before leaving the production line.
Common applications for the 1550 series include Class 5-6 medium-duty trucks and heavy commercial transport vehicles. Well-known vehicle platforms that use this cross kit include the Peterbilt 220, Kenworth T270, International DuraStar 4400, Isuzu FVR, Hino 268, among many others. The universal joint series size chart above details every SAE series alongside our Jiukai model numbers for rapid identification.
Measure the cap outer diameter (A) and snap-ring span (B) on your existing joint. The 1550 series uses a 42 mm (1.654″) cap OD and a 104.5 mm span. If those figures do not match, visit the Spicer cross reference to identify the correct series, or contact our sales team for direct assistance.
Key Features of the Jiukai 1550 Cross Kit
Chromium-molybdenum steel, through-hardened then case-hardened to HRC 58–62 on cap surfaces. The hard shell resists fretting wear from the needle rollers while the tougher core absorbs shock loads from aggressive acceleration and terrain transitions.
Caps are cylindrically ground to h6 tolerance (+0 / −0.013 mm), producing a slip-fit in standard yoke bores. Correct fit eliminates the micro-rocking that destroys imprecisely made aftermarket caps within tens of thousands of kilometres.
Each cap carries a full complement of needle rollers — no cage reduction — to maximise the contact area and distribute load across the entire bearing envelope. This raises dynamic load capacity without enlarging the overall cross-kit footprint.
A standard 1/4-28 UNF Zerk nipple allows field re-lubrication without removing the driveshaft. Regular re-greasing is the single most effective way to extend cross-kit life, and this fitting keeps that option open for the entire service life of the part.
Manganese phosphate coating over the journal surfaces provides corrosion protection during shipping and storage while remaining chemically neutral to all NLGI Grade 2 EP greases specified for drive-shaft applications.
Jiukai’s quality management system is registered under ISO 9001, ISO 14001, and TS/16949, and the product carries CE marking for European market compliance. Dimensional inspection reports are available on request for OEM and fleet procurement teams.
1550 Universal Joint Dimensions vs Neighbouring Series
The 1480 universal joint below shows your series in context. The highlighted row is the 1550. Use cap OD (A) and span (B) together to positively identify any cross kit — a single dimension alone is insufficient because some series share one value while differing in the other.
| SAE Series | Cap OD (mm) | Cap OD (in) | Span (mm) | Spicer Ref | Typical Use |
|---|---|---|---|---|---|
| 1310 | 27 | 1.062″ | 74.6 | 5-153X | Light trucks, SUVs, half-ton pickups |
| 1330 | 30.2 | 1.188″ | 92 | 5-178X | 3/4-ton trucks, vans |
| 1350 | 35 | 1.375″ | 106.5 | 5-1350X | 1-ton HD trucks, tow packages |
| 1410 | 41 | 1.625″ | 108 | 5-1410X | Class 4-5 medium-duty trucks |
| 1550 ← You are here | 42 | 1.654″ | 104.5 | 5-1550X | Class 5-6 medium-duty trucks and heavy commercial transport vehicles |
| 1480 | 41 | 1.625″ | 118 | 5-1480X | Class 4-6 medium commercial |
| 1710 | 48 | 1.890″ | 127 | 5-1710X | Class 6-8 heavy trucks |
| 1810 | 50 | 1.969″ | 118 | 5-1810X | Class 8 semis, off-highway |
Applications
The 1550 U-joint cross kit is the OEM specification for the following driveline positions and vehicle categories:
- ✓Class 5–6 medium-duty commercial truck propshafts (Peterbilt 220, International DuraStar)
- ✓Refuse collection and recycling truck drivelines
- ✓Utility service trucks — digger derricks and cable-reel trailers
- ✓Regional delivery truck chassis (Isuzu FVR, Hino 268)
- ✓Heavy emergency vehicles — fire appliances and aerial platforms
- ✓Crane carrier drivelines — rough-terrain and all-terrain cranes
- ✓Construction aggregate trucks and off-road dumpers
Snap Ring and Packaging
The 1550 series cross kit uses an external snap-ring (C-clip) with a groove width of 1.75 mm. Snap rings are included in every shipment. The ring seats in the groove on the outer face of the yoke bore and is the primary axial retention method for the bearing cap.
An inside-snap-ring variant (suffix -IC) is available for yokes whose ear design does not accommodate external retention. Contact [email protected] for availability and lead times on non-standard configurations.
Frequently Asked Questions
Available Variants and Ordering
| Part Number | Description | Grease Fitting | Lock Type |
|---|---|---|---|
| 42.01 | Standard cross kit — external snap ring, greaseable | Yes — Zerk 1/4-28 UNF | External C-clip |
| 42.01-NG | Non-greaseable (sealed-for-life) | None (sealed caps) | External C-clip |
| 42.01-IC | Inside-snap-ring variant | Yes — Zerk 1/4-28 UNF | Internal C-clip |
Minimum order quantities, volume pricing tiers, and OEM private-label packaging are available for wholesale and trade buyers. Email [email protected] with your target quantity and destination port for a freight-inclusive quotation.
Contact us at [email protected] or use the enquiry form. We respond within 24 hours.
Browse the Full Cross Kit Series
1550 Universal Joint: Design Rationale and Field Identification
The 1550 series illustrates that cap outer diameter, not span length, is the primary determinant of torque capacity in cross-kit engineering. By increasing the cap OD from 41 mm to 42 mm while shortening the snap-ring span from 118 mm to 104.5 mm relative to the 1480, the 1550 achieves a higher 1,250 Nm peak torque rating in a shorter overall body. The wider cap provides greater cylindrical bearing contact area at the journal-to-cup interface where Hertzian contact stress governs fatigue life, making this geometry correct for Class 5 and 6 applications where the driveshaft envelope is constrained and the 1480 series span cannot be accommodated without compressing the telescoping section below its minimum operating length.
Refuse truck and emergency vehicle applications are among the most demanding environments for the 1550. High-frequency wheel-lock events and compaction shock loads in rear-loader refuse trucks create severe cyclic stresses in the propshaft, and the 1,250 Nm peak provides adequate margin with the greaseable 42.01 configuration allowing re-lubrication during routine weekly wash-out inspections. Positive field identification requires two measurements: 42 mm cap OD and 104.5 mm snap-ring span. A 41 mm reading indicates a 1410 or 1480 series; a 127 mm span indicates a 1710 series. For high-temperature applications above 80 degrees Celsius, a high-temperature cap seal variant of the 42.01 is available from [email protected].
1550 Universal Joint: Wear Symptoms in Class 5-6 Service
The 1550 universal joint in Class 5 and 6 trucks gives earlier and clearer warning of wear than lighter-duty series because the higher operating torque amplifies the mechanical effects of bearing clearance. The characteristic early symptom is a clunk during gear engagement at low vehicle speed, followed within weeks by a sustained vibration that tracks road speed and disappears when the driveshaft is decoupled in neutral. Refuse truck operators should pay particular attention to any new vibration, because the high-frequency shock loading in refuse collection service accelerates wear progression once it begins. Perform hands-on lash checks at each PM visit; replace both cross kits on the same driveshaft simultaneously when one reaches the wear limit to avoid residual vibration from unequal service life between the front and rear joints.
Identifying and Replacing a Worn 1550 Universal Joint
Early identification of a failing 1550 U-joint prevents catastrophic driveshaft separation in Class 5–6 service. Listen for a low-frequency clunk during gear engagement or load reversal; feel for a vibration at cruise speed that varies in frequency with vehicle speed rather than with engine rpm. A worn 1550 cross kit typically shows radial play of 2–4° in the yoke bore before the first vibration complaint; by the time the clunk is audible, the bore surface is usually damaged as well as the needle raceways.
When replacing, confirm the 42 mm cap OD and 104.5 mm snap-ring span to verify a 1550 series before ordering. Use a press with proper cap-size receive sockets (42 mm OD supports). Seat the 1.75 mm external snap rings fully, reinstall the driveshaft in its original phasing, and torque all fasteners. Prime the Jiukai 42.01 Zerk with NLGI Grade 2 EP grease at installation; schedule the next re-grease at 25,000 km or six months, whichever comes first.
1550 Universal Joint: Sourcing for Parts Distributors
Parts distributors carrying 1550 series cross kits need a supplier with documented quality processes and consistent lead times. Jiukai’s 12,000 m² facility in Haining operates three shifts with standard production lead times of 15–20 days for standard stock SKUs. Express production for urgent orders is available at a lead time premium for quantities above 100 pieces.
Distributor accounts receive access to Jiukai’s inventory portal for real-time stock checking, CMM reports and hardness certificates for each batch, and optional private-label packaging from 200 pieces. The 42.01 cross kit is kept in stock continuously due to its Class 5–6 truck application base. Contact [email protected] for distributor account terms.