Oct . 26, 2025 12:20 Back to list

Oil seal ASSP W 29.85x47x11.3 R NBR SOG/TW - Leak-Proof

Field Notes on a Workhorse Seal: Oil Seal ASSP W 29.85x47x11.3 R NBR SOG/TW

If you’ve been around differentials and crank snouts as long as I have, you quickly learn which seals behave under real-world grit. This one—manufactured in JULU INDUSTRY AREA, XINGTAI CITY, HEBEI, China—lands in that practical sweet spot: dependable NBR, dust lip, garter spring, and a fit that doesn’t fight you.

Where it fits and why mechanics pick it

The seal is commonly specified for front/left crankshaft positions and right-side front axle/differential assemblies on select CITROËN, PEUGEOT, FIAT, and LANCIA platforms—always verify with OE numbers (CITROËN/PEUGEOT OE-312126, FIAT/LANCIA OE-9403121269, CITROËN OE-96080792). Many customers say the seating is forgiving yet snug, and—surprisingly for the price tier—the spring tension feels consistent box to box. Color of the NBR can vary; that’s normal and doesn’t change performance.

Quick spec sheet (real-world use may vary)

Type	A SPW (1) rotary shaft seal, dust lip + garter spring
ID × OD × W	29.85 mm × 47 mm × 11.3 mm
Material	Nitrile rubber (NBR) with plastic reinforcement ring
Hardness	≈70 ±5 Shore A
Temp range	≈ -30°C to +100°C (short peaks to +120°C)
Speed capability	Up to ≈10 m/s, application-dependent
Pressure	Non-pressure; ≤0.5 bar recommended
Standards	Designed to DIN 3760 / ISO 6194 guidelines
Brand / Maker	YJM / JULU YJM HWMF SEAL CO., LTD

Manufacturing flow, testing, and service life

Material selection (NBR per ASTM D2000 classes) → rubber compounding and preform → compression/injection molding around the plastic ring → post-cure → lip finishing → garter spring assembly → trim/deflash → oil mist conditioning → inspection.

Media compatibility checks per ISO 1817 (engine oil, gear oil; splash coolant exposure).
Dimensional audits to ISO 6194-1 tolerances; lip runout and concentricity verified.
Bench leak tests at ≈0.2 bar; friction torque trending for wear prediction.

In mixed urban-use drivetrains, expected life is often 80,000–150,000 km, but honestly, installation quality and shaft finish (Ra ≤ 0.2–0.4 μm) make or break that. Clean the bore, lube the lip, and avoid spiraling the spring—simple, but crucial.

Applications and advantages

Front axle right differential inputs; front/left crankshaft positions on select models (verify OE).
Dust lip helps in gritty, off-city service; NBR balances cost and oil resistance.
Plastic ring keeps weight down and prevents galvanic issues vs. bare steel carriers.

Vendor snapshot (informal comparison)

Vendor	Strengths	Notes
YJM (this item)	Solid NBR mix, consistent spring, value pricing	Docs (ISO/QC) available on request
Global brand (SKF/Corteco)	Broad catalog, premium materials incl. FKM	Higher cost; excellent traceability
Generic import	Lowest upfront price	Spec variability; check lip geometry

Customization and packaging

Need high-heat? Swap NBR to FKM. Want more dirt exclusion? Double-dust-lip variant. Private-label print, OE-style cartons, and batch trace codes can be arranged, typically with reasonable MOQs.

Two quick field cases

Fleet garage in Lyon: swap-in on light vans; post-install seep rate dropped to near-zero over 30k km; mechanics praised lip conformity on lightly worn shafts.
Independent shop in Naples: mixed-brand axles; this seal handled minor shaft wear when paired with a wear sleeve—no comeback after 6 months.

Bottom line: Oil Seal ASSP W 29.85x47x11.3 R NBR SOG/TW is a practical choice when you want a dust-lipped, spring-loaded NBR unit that doesn’t overpromise. It just seals. And yes, I like that.

Fitment reminders

Reference OEMs: CITROËN - PEUGEOT OE-312126 / FIAT - LANCIA OE-9403121269 / CITROËN OE-96080792. Placement often Right/front axle or front/left crank—check your VIN and housing depth. Condition: brand-new in retail packaging from YJM.

Citations

ISO 6194: Rotary shaft lip-type seals — Vocabulary, dimensions, and tolerances.
DIN 3760: Rotary shaft lip seals — Requirements and testing.
ASTM D2000: Standard Classification System for Rubber Products in Automotive Applications.
ISO 1817: Rubber, vulcanized — Determination of the effect of liquids.

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