Import 30311 Truck Bearing — Buy in wholesale FOB from Supplier in China

The 30311 is a single-row tapered roller bearing engineered for heavy-duty truck and bus wheel hub assemblies, manufactured by Linqing Huaxu Bearing Manufacturing Co., Ltd. in Liaocheng, Shandong Province, China. This metric-series bearing conforms to the 30311 designation within ISO 355 / DIN 720 dimensional standards, with a 55mm bore diameter, 120mm outer diameter, and 32.5mm total width. The design features conical inner and outer ring raceways with tapered rollers arranged at a calculable contact angle, enabling simultaneous support of radial loads and significant axial loads in one direction. Chrome steel GCr15 material provides the hardened bearing-grade steel composition standard to Chinese and international tapered roller bearing manufacture.

GCr15 chrome steel, equivalent to AISI 52100, offers typical hardness of 60-65 HRC after through-hardening and tempering, with excellent wear resistance and fatigue life under rolling contact stress. The 30311 geometry includes a separable design: the cone assembly (inner ring with rollers and cage) detaches from the cup (outer ring), facilitating separate mounting and field maintenance. For truck applications, paired opposed mounting is standard practice to handle bidirectional thrust loads during braking and cornering. Linqing Huaxu specifies compatibility with DFMC, KINGLONG, and YUTONG commercial vehicle platforms, indicating dimensional interchangeability with OEM wheel hub bearing assemblies for these Chinese bus and truck manufacturers.

Fleet operators, aftermarket distributors, and commercial vehicle repair networks represent the primary buyer segments for this bearing category. The 30311 ships under HS code 8482.20 for tapered roller bearings, classifying it within international trade statistics for automotive powertrain components. Standard export packaging is noted without detail; confirm inner plastic wrap, preservative oil, and outer carton or wooden case specifications with the supplier. Warranty coverage of one year is stated, though terms and claim procedures require clarification. Delivery time ranges from 3-35 days according to the source, suggesting stock availability for common sizes with longer lead times for bulk or customized orders.

Linqing Huaxu Bearing Manufacturing Co., Ltd. is located in Liaocheng City, Shandong Province, China, postal code 252600. The supplier holds a harbor trust tier with a 0.00% response rate and zero recorded average response hours, indicating minimal platform engagement data rather than verified performance history. The company positions itself within the concentrated bearing manufacturing cluster of Linqing, a region known for tapered roller bearing and ball bearing production serving domestic automotive aftermarket and export markets. The listing focuses narrowly on truck bearing applications rather than presenting a broad industrial bearing portfolio.

No verified production capacity, employee count, annual revenue, quality system certifications (ISO 9001, IATF 16949), or named OEM supply agreements appear in the source description. The stated one-year warranty and 3-35 day delivery window represent the only explicit service commitments visible to buyers. Company history, founding date, export experience years, and major client references are absent from available data. Buyers should conduct independent due diligence on manufacturing capabilities, quality control procedures, and metallurgical testing capacity before relying on this supplier for safety-critical wheel bearing applications in commercial vehicles.