This is the third part of our URAL disc-type CV joint mini-series. After the sliding yoke (375-2303072 and its -Б variant), we come to the joint knuckle — listed, like the yoke, under two numbers: 375-2303074 and 375-2303074-Б. This guide covers the base number: what it does, which trucks take it, and how to decide between the suffixes.
What this part does
The knuckle 375-2303074 is the front-axle joint knuckle of URAL trucks — an element of the disc-type constant-velocity joint in the steering knuckle. The joint disc 375-2303075 fits into the knuckle slot, connecting the assembly to the outer half-axle fork. Torque flows through yoke → disc → knuckle to the steered, driven wheel.
The knuckle's slot is a wear surface: once it develops play, the joint knocks at full steering lock — the classic symptom on high-mileage pre-2003 URAL 6x6 trucks.
Specifications
| Property | Value |
|---|---|
| Part number | 375-2303074 (also written 3752303074) |
| Name | Universal joint (joint knuckle) |
| Brand | URAL |
| Group | Front axle — differential and axle shafts |
| Weight | 3.74 kg |
| Quantity per vehicle | 4 (per the front-axle drawings) |
Which trucks does it fit?
Three pre-2003 URAL 6x6 models:
- Ural-375 — the classic petrol V8 military truck
- Ural-4320 — the diesel 6x6 successor
- Ural-5557 — 6x6 chassis for special bodies
Later (post-2003) axles use a different steering-knuckle joint design — always confirm the truck's year first.
375-2303074 vs 375-2303074-Б: which suffix?
The Cyrillic -Б marks a design variant of the same knuckle:
- 375-2303074 (this part) — the base drawing number, catalogued for the three models above.
- 375-2303074-Б — the variant, which additionally appears on Ural-4320-31, Ural-4420 and Ural-55571 drawings (including the 2010 catalogue at position 43, quantity 4 per vehicle).
Same role, same ~3.74 kg, same joint family — suppliers generally treat them as interchangeable, but parts books are strict about suffixes:
- Match the exact number — with or without -Б — against your vehicle's parts book.
- If your truck is a 4320-31, 4420 or 55571, check the -Б variant specifically.
- If the old part and the parts book disagree, send the number plus a photo and your truck model to the supplier before ordering.
Buying smart: the joint wears as a system
The yoke, disc and knuckle share the same contact loads. The classic overhaul approach:
- Jack up the front axle and check play at each joint position.
- Order knuckles (375-2303074), yokes (375-2303072) and discs (375-2303075) together for the worn positions.
- Count 4 knuckles per vehicle when planning fleet orders.
Where to look it up
Full specifications and the complete fitment list are on the part page:
375-2303074 Universal joint — kamaz-parts.com
Its sibling with a photo: 375-2303074-Б Universal joint — and the mating 375-2303075 joint disc.
The catalogue covers 87,000+ KAMAZ, URAL, MAZ, MTZ and TATRA part numbers organized by the original OEM drawing structure (brand → model → assembly group → position table), so you can verify any number against the actual assembly drawing before ordering. Wholesale inquiries go straight from the part page — mixed pallets welcome, export paperwork included.
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