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China Auxiliary Sheave Assembly for Drilling Rigs - Top Suppliers & Factory Quality for Lifting Operations
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, SGS etc. | |
Product Features
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.
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.
Heat-Treated Rope Groove
Medium frequency induction hardening enhances wear resistance, extending both the sheave lifespan and the working life of the wire rope.
Strict Quality Assurance
Every assembly undergoes MT and UT inspection before leaving the factory, ensuring the structural reliability required for hoisting applications.
API 8C Certified Quality
All assemblies follow internal production standards aligned with API 8C principles to ensure load integrity, safety, and long-term stability. Our API 8C certificate number: 8C-0349.
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.
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.
Our auxiliary sheaves are manufactured in a facility with more than a decade of production experience, using forging-welded construction and strict process control. Each sheave assembly is designed to integrate seamlessly with the mast, drawworks auxiliary hoisting systems, and structural lifting points on rigs ranging from 1000 HP to 3000 HP. 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.
Contact for more details about the Auxiliary sheave assembly which used for HONGHUA, RG, RONGSHENG, EMSCO, LSNOV.
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Frequently Asked Questions
Q1: What is the main application of the Auxiliary Sheave Assembly?
A1: It is typically used for redirecting wire rope during auxiliary lifting operations on drilling rigs, supporting wire rope routing, and maintaining proper tension, alignment, and operating stability in the hoisting system.
Q2: Are these auxiliary pulleys compatible with major rig brands?
A2: Yes, they offer high OEM interchangeability and are fully compatible with auxiliary sheave assemblies from BOMCO, HH, LS NOV, RG, and other major rig manufacturers.
Q3: What manufacturing standards and certifications apply to these assemblies?
A3: The sheave assemblies are produced under the API 8C standard (API 8C certificate number: 8C-0349), ensuring structural load integrity, safety, and long-term operating stability.
Q4: What materials and surface treatments are used to prevent wear?
A4: They are made of 45# Alloy Steel (forged and welded alloy steel equivalent to JIS S45C / AISI 1045 or higher). The rope groove undergoes medium frequency induction hardening to enhance wear resistance and extend service life.
Q5: What quality inspections are conducted before delivery?
A5: Every sheave assembly undergoes 100% Magnetic Particle Testing (MT) and 100% Ultrasonic Testing (UT) on critical welds and forged sections. Third-party inspection reports (BV, CCS, ABS, SGS) are also available.
Q6: What is the expected service life of the sheave assembly?
A6: In standard drilling environments, the service life is approximately 8 to 10 years. The induction-hardened grooves and alloy-steel construction provide excellent fatigue resistance.