Timken NP392358/NP739603 Tapered Roller Bearing 317.5x447.675x85.725mm Heavy Duty Industrial Reducer Pump

The NP392358/NP739603 is a large-bore single-row tapered roller bearing, dimensionally equivalent to HM259048/HM259010. With a bore of 317.5 mm (12.5 in) , an outer diameter of 447.675 mm (17.625 in) and a cone width of 85.725 mm (3.375 in) , it sits firmly in the heavy industrial size range, with a single-row set weight of approximately 40.6 kg.

The separable cone (NP392358) and cup (NP739603) design allows independent mounting and inspection — a practical advantage in large reducers and pumps where the housing is not easily disassembled. The tapered geometry carries combined radial and axial loads in one direction, making it suitable for shafts that experience both the weight of rotating components and thrust from helical gears or impeller forces.

Model:
NP392358/NP739603
Brand:
Timken/CHIK

Model:	NP392358/NP739603
Type:	Tapered Roller Bearing
Size:	317.5x447.675x85.725mm
Availability:

Quantity:



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Product Overview

Item	Details
Model	NP392358/NP739603 (Cone NP392358 + Cup NP739603)
Equivalent Model	HM259048/HM259010
Bearing Type	Single Row Tapered Roller Bearing
Product Status	Aftermarket replacement, interchangeable with common part numbers
Primary Application	Heavy industrial reducers, pumps, mining/metallurgical equipment, general heavy-duty power transmission
Design Advantage	Tapered geometry carries combined radial and axial loads; separable cone and cup simplify mounting and inspection in large assemblies
Weight	Approx. 40.6–40.7 kg (single-row TS set)

Specifications

Item	Data
Cone Part Number	NP392358 (HM259048)
Cup Part Number	NP739603 (HM259010)
Bore Diameter (d)	317.500 mm (12.5000 in)
Outer Diameter (D)	447.675 mm (17.6250 in)
Cone Width (B)	85.725 mm (3.3750 in)
Cup Width (C)	68.263 mm (2.6875 in)
Total Width (T)	85.725 mm (3.3750 in)
Dynamic Radial Rating C90 (90M revs)	438,000 N (98,500 lbf)
Dynamic Radial Rating C1 (1M revs)	1,690,000 N (380,000 lbf)
Dynamic Axial Rating Ca90 (90M revs)	251,000 N (56,500 lbf)
Static Radial Rating C0	2,790,000 N (628,000 lbf)
e Factor	0.33
K Factor	1.74
Y Factor	1.79
Weight	40.60 kg

Supply

Item	Details
MOQ	100 pcs
Stock Status	Generally available from stock; for bulk orders, availability depends on the production schedule.
Packaging	Individual box + outer carton + pallet; neutral or customized packaging available for bulk orders
Lead Time	3–7 days for stock; 7–15 days for bulk; 15–25 days for customized/OEM orders
Shipping Methods	Bulk orders: air / sea / rail. Sample orders: DHL / FedEx / UPS / TNT for B2B evaluation only
Trade Terms	EXW, FOB, CIF, DDP (negotiable)
Loading Port	Shanghai / Ningbo / Qingdao / Shenzhen (or as required)
Sample Order	Available for B2B evaluation only; sample cost and freight to be confirmed
OEM / ODM	Accepted for bulk orders; custom logo, packaging and labels available
Quality Control	100% inspection before shipment

Payment

Item	Details
Payment Methods	T/T, PayPal, Credit Card, etc.
Payment Terms	Small orders: 100% payment in advance. Bulk orders: 30% deposit, 70% before shipment. Negotiable for long-term partners.
Currency	USD / EUR / CNY
Trade Terms	EXW, FOB, CIF, DDP (negotiable)
Invoice	Commercial invoice, packing list and required shipping documents provided