SAE 1045 Carbon Steel Steering Knuckle King Pin Kit with 50-63 HRC Hardness - Complete Both-Sides KP-133 MN-53 Kit
| Case Depth: | 0.9-1.2mm | King Pin Size: | Ø35.15 × 205mm (some Channels: Ø35 × 206mm) |
| King Pin Material: | SAE 1045 Carbon Steel | Surface Hardness: | 50-63 HRC |
| Kit Contents: | King Pins ×2, Bushings, Bearings, Seals, Shims, Lock Pins | Installation Position: | Front Axle Steering Knuckle, Both Sides |
| Vehicle Models: | Nissan UD CM-90 (1976-1980), Condor CM-85 | Engine Compatibility: | Nissan UD Diesel Engines (CM-90 Platform) |
| High Light: | SAE 1045 Carbon Steel King Pin Kit,Complete Both-Sides King Pin Kit,50-63 HRC Hardness KP-133 MN-53 Kit |
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This Steering Knuckle King Pin Kit is a verified direct-fit replacement for Nissan UD CM-90 trucks, with OEM numbers 40025-Z5025 / 40025Z5025 and internal codes KP-133 / MN-53. The kit is a complete both-sides assembly containing king pins, bushings, bearings, seals, shims, and lock pins, specifically engineered for Nissan UD CM-90 (1976-1980) and Condor CM-85 platforms.
The king pin is the critical pivot that connects the steering knuckle to the front axle assembly. It supports the vertical load of the vehicle's front end while allowing the wheel hub and steering components to rotate smoothly for steering. The king pin operates in conjunction with bushings and bearings, relying on a lubricant film to minimize friction and maintain precise steering return.
- Excessive steering wheel free play; vehicle wanders or pulls to one side at highway speed
- Uneven or rapid front tire wear (cupping, feathering, or one-sided wear)
- Clunking or metallic knocking noises from the front axle area
- Poor steering returnability and vague on-center feel
- Visible grease leakage or corrosion at the lower king pin area
These symptoms indicate that king pin-to-bushing clearance has exceeded allowable limits and the kit should be replaced promptly to prevent further steering system damage.
- Material Hardness Verified: King pin manufactured from SAE 1045 carbon steel, surface hardness 50-63 HRC, case depth 0.9-1.2mm
- Dimensional Accuracy Verified: King pin size Ø35.15 * 205mm, key dimensions verified by CMM
- OE Cross-Reference Verified: Internal code KP-133, replaces OEM 40025-Z5025 / 40025Z5025, also compatible with 40025-Z5027, 40025-Z5028, 40025-Z5029
- Full Both-Sides Kit: One kit covers both left and right steering knuckles, reducing procurement steps
| Part Number: | 40025Z5025 40025-Z5025 | Product Name: | Steering Knuckle King Pin Kit KP-133 |
|---|---|---|---|
| Car Model: | UD CM-90 | Engine Model: | UD CM-90 |
| Condition: | 100% Brand New | Size: | Standard |
| Material: | High-strength aluminum alloy & precision bearings | Quality Standard: | OEM equivalent / ISO quality control |
| Brand | Model | Platform | Years |
|---|---|---|---|
| Nissan UD | CM-90 | CM-90 | 1976-1980 |
| Nissan UD | Condor | CM-85 | 1976 onward |
- This kit is a full both-sides set — one purchase covers left and right steering knuckles
- Some platforms list both Ø35*205 and Ø35*206 specifications; verify actual king pin diameter before ordering
- Drive configuration (4*2 / 6*4) and LHD/RHD may affect king pin selection; provide chassis number for confirmation
- Inspect steering knuckle bore for wear during installation; replace knuckle if bore is out of specification
Superior bending strength and wear resistance vs. standard carbon steel — verified by hardness test: 50-63 HRC surface, 0.9-1.2mm case depth
Eliminates separate ordering and mismatched part risk — one kit covers both sides, reducing downtime
Higher installation success rate than universal-fit alternatives — king pin Ø35.15*205mm verified by CMM to match OEM knuckle bore
Extended bushing compatibility and reduced early wear risk — case depth 0.9-1.2mm, surface finish meets mating requirements
Prevents grease leakage and contaminant ingress — complete sealing components in one kit, eliminating secondary purchases
| QC Item | Verification Method / Standard |
|---|---|
| King Pin Dimensions | CMM measurement, tolerance control on Ø35.15*205mm |
| Surface Hardness | Rockwell hardness tester, batch sampling 50-63 HRC |
| Case Depth | Metallographic specimen method, standard 0.9-1.2mm |
| Bushing Bore Fit | Air gauge / inside micrometer, ensuring clearance with king pin meets spec |
| Material Composition | Spectrometer verification of SAE 1045 carbon steel |
| Appearance & Marking | Visual inspection, OEM number and model clearly marked |
| Outgoing Sampling | Batch sampling per AQL standard |
King pin replacement on a commercial steering axle is a heavy-duty chassis repair involving front axle disassembly and steering system reassembly. It must be performed by a qualified technician using specialized press equipment. Incorrect installation torque or fitment clearance will directly result in steering failure risk.
- Lift and safely support the front axle; remove wheels, brake components, and tie rod ends
- Remove the steering knuckle assembly; press out old king pin and bushings using a dedicated press tool
- Clean the knuckle king pin bore; inspect for wear and replace the knuckle if the bore is out of specification
- Press in new bushings ensuring oil holes align; ream or finish to the specified fit per the workshop manual
- Apply grease and install the king pin; fit shims and adjust axial end play to the specified range
- Install lock pins and tighten to torque specification. Always refer to the Nissan UD original workshop manual for the exact torque values applicable to your specific chassis model
- Reassemble the steering knuckle and tie rod; verify steering free play and returnability
- Every 10,000 km or at each vehicle lift service, check king pin axial end play with a dial indicator and log the reading
- Every 20,000 km or per fleet maintenance schedule, replenish grease at king pin fittings
- Maintain an end-play log; schedule replacement when clearance exceeds OEM maximum specification
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