Import 51300-381-B Varco Top Drive — Buy in wholesale FOB from Supplier in China

The 51300-381-B VARCO TOP DRIVE from Amlpp Petroleum Parts is a precision-engineered fastener designed for integration into National Oilwell Varco top driveScripts drive drilling systems used in oil and gas exploration. This component functions as critical hardware within the top drive assembly, where it must maintain structural integrity under axial and torsional loads transmitted during drilling operations. The supplier specifies alloy steel or high-strength steel material construction, appropriate for the fatigue and离 cyclic loading conditions encountered in top drive systems. Varco top drive systems operate with static hook loads frequently exceeding 500 short tons and continuous torque output in the range of 30,000 to 50,000 foot-pounds, placing stringent demands on every fastened joint in the drive train.

Top drive fasteners in this size and specification category typically conform to API Spec 7-1 for rotary drilling equipment, with material grades selected for tensile strength of 120 ksi or above and Charpy V-notch impact requirements suited to low-temperature drilling environments. The 51300-381-B designation follows Varco's internal part numbering system, where the prefix often indicates assembly group and the suffix specifies revision level. Standard surface treatment for such fasteners includes phosphate coating or zinc plating with chromate conversion for corrosion resistance in marine atmospheres common to offshore drilling. Thread forms are typically UN or UNJ profile with Class 2A or 3A fit to prevent galling in high-torque applications. The supplier's extensive catalogue of drilling equipment spares suggests sourcing relationships with multiple OEM and aftermarket manufacturers across China.

Purchasers of this fastener include drilling contractors maintaining NOV top drive fleets, oilfield equipment rental companies, and petroleum parts distributors serving upstream exploration markets. The component is relevant to both land and offshore rig operations where Varco TDS-11SA, TDS-8SA, or similar models are deployed. When sourcing, buyers should confirm the fastener's exact dimensional interchangeability with the original Varco part, including grip length, thread engagement, and head configuration for proper tool access in the confined top drive housing. Material certification, hardness testing documentation, and magnetic particle inspection reports are standard requirements for critical drilling fasteners. Buyers should also verify whether Amlpp Petroleum Parts provides material test reports with chemical composition and mechanical properties traceable to a specific heat lot.

Amlpp Petroleum Parts operates from No. 2550 Hongqiao Road, Changning District, Shanghai 200050, China. The supplier holds a harbor trust tier on the platform with a 0.00 response rate and zero average response hours, indicating no recent platform-based communication activity. The company's catalogue spans an exceptionally broad range of petroleum drilling equipment spares, including top drive components, mud pump parts, rotary table assemblies, BOP elements, drawworks accessories, and diesel engine components for drilling power packages. This breadth suggests a trading or distribution model rather than single-product manufacturing, with sourcing networks across Chinese industrial centres.

The supplier's source description lists hundreds of individual parts without categorised product pages, presenting a parts-list format typical of oilfield spare parts traders. There is no stated manufacturing capability, factory certification such as API Q1, or specific quality management system accreditation in the provided data. The address in Shanghai's central business district rather than an industrial zone further supports a trading company profile. Buyers should approach Amlpp Petroleum Parts with explicit requirements for original manufacturer certificates of conformance, material test reports, and inspection documentation, as the supplier's value proposition lies in parts availability rather than in-house engineering or manufacturing oversight.