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China Auxiliary Sheave Assembly for Drilling Rigs - Quality Suppliers and Factory Direct Solutions
Product Specifications
| Product name | Auxiliary Sheave Assembly / Rig Auxiliary Pulley |
| Application | Typically used for redirecting wire rope during auxiliary lifting operations |
| Sheave OD | 400mm (15 3/4 inches) |
| Groove diameter | 16~24mm |
| Material | 45# Alloy Steel (forged and welded alloy steel with mechanical properties equivalent to JIS S45C / AISI 1045 or higher-grade structural steel) |
| Surface Treatment | Rope groove induction hardened for wear resistance |
| Temperature rating | -40°C to 120°C |
| Service life | 8~10 years in standard drilling environments. Induction-hardened grooves and alloy-steel construction extend fatigue resistance, while periodic inspection ensures long-term reliability in both primary and auxiliary hoisting applications. |
| Mounting Compatibility | Designed for mast structure attachment points or auxiliary hoisting brackets on common rig series such as ZJ30, ZJ40, ZJ50, and ZJ70. |
| Pre-delivery Inspection | 100% Magnetic Particle Testing (MT) 100% Ultrasonic Testing (UT) on critical welds and forged sections. |
| Standard | Produced under API 8C |
| Third party witness and inspection report available: Bureau Veritas (BV), CCS, ABS, SJS etc. | |
Product Features
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HIGH OEM Interchangeability: Fully compatible with auxiliary sheave assemblies supplied by BOMCO, HH, LS NOV, RG and other leading rig manufacturers, offering a reliable replacement option for both domestic and international drilling operations.
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Durable Forged-Welded Construction: The sheave body is formed using a forged steel blank welded to a reinforced housing, providing excellent load-bearing capacity and resistance to deformation under cyclic rope loads.
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Heat-Treated Rope Groove: Medium frequency induction hardening enhances wear resistance, extending both the sheave lifespan and the working life of the wire rope.
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Strict Quality Assurance: Every assembly undergoes MT and UT inspection before leaving the factory, ensuring the structural reliability required for hoisting applications.
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Source Manufacturer Advantages: With more than ten years devoted to sheave production, our factory provides stable supply, custom sizing options, and consistent quality for drilling contractors and OEM equipment builders.
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Wide Rig Compatibility: Designed to integrate seamlessly with mast, drawworks auxiliary hoisting systems, and structural lifting points on rigs ranging from 1000 HP to 3000 HP.
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API 8C Certified — Certificate No.: 8C-0349 | All assemblies follow internal production standards aligned with API 8C principles.
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MTPM Auxiliary sheave assemblies are classified as functional components within the hoisting and mast structure of land drilling rigs, rather than standalone equipment. They support the wire rope routing in the lifting system and help maintain proper tension, alignment, and operating stability. Although small compared with crown blocks or traveling blocks, these assemblies play a critical role in the overall reliability of the rig.
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Our auxiliary sheaves are manufactured in a facility with more than a decade of production experience, using forging-welded construction and strict process control. We supply full interchangeability with sheave assemblies used by BOMCO, HH, LS NOV, and other major OEMs, supported by API 8C compliant quality control and documented inspection.
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Contact us for more details about the Auxiliary Sheave Assembly used for HONGHUA, RG, RONGSHENG, EMSCO, LSNOV.
⚠️ All product names, trademarks, and part numbers are used for identification purposes only and are the property of their respective owners. We are an authorized and recognized supplier. If you are looking for specific mud pump safety valve part numbers, please contact our sales team for detailed references or technical support.
Frequently Asked Questions
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What is the sheave OD and groove diameter range of this auxiliary sheave assembly?
The sheave outer diameter (OD) is 400mm (approximately 15 3/4 inches), and the groove diameter range is 16~24mm, making it compatible with a variety of wire rope sizes used in standard drilling operations.
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Which rig models is this auxiliary sheave assembly compatible with?
This assembly is designed for mast structure attachment points or auxiliary hoisting brackets on common rig series including ZJ30, ZJ40, ZJ50, and ZJ70. It also offers full OEM interchangeability with assemblies from BOMCO, HH, LS NOV, RG, HONGHUA, RONGSHENG, EMSCO, and other major rig manufacturers.
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What quality inspections are performed before delivery?
Every assembly undergoes 100% Magnetic Particle Testing (MT) and 100% Ultrasonic Testing (UT) on all critical welds and forged sections prior to shipment. Third-party witness and inspection reports are also available from recognized bodies such as Bureau Veritas (BV), CCS, ABS, and SJS.
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What is the expected service life of the auxiliary sheave assembly?
Under standard drilling environments, the service life is 8~10 years. The induction-hardened rope grooves and alloy-steel construction significantly extend fatigue resistance. Periodic inspection further ensures long-term reliability in both primary and auxiliary hoisting applications.
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Is this auxiliary sheave assembly API 8C certified?
Yes. All assemblies are produced under API 8C standards. Our API 8C certificate number is 8C-0349. Production follows internal quality standards aligned with API 8C principles to ensure load integrity, safety, and long-term stability.
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Can custom sizing or special configurations be arranged?
Yes. As a source manufacturer with over ten years of sheave production experience, we offer custom sizing options and can accommodate special configurations to meet the requirements of drilling contractors and OEM equipment builders. Please contact our sales team for technical support and detailed references.