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China Auxiliary Sheave Assembly for Drilling Rigs - Suppliers & Factory for Efficient Wire Rope Handling
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
API 8C Certified — No. 8C-0349
OEM Interchangeable
MT & UT Inspected
10+ Years Manufacturing
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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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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.
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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.
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
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What rig models is this Auxiliary Sheave Assembly compatible with?
The auxiliary sheave assembly is designed for mast structure attachment points and auxiliary hoisting brackets on common rig series including ZJ30, ZJ40, ZJ50, and ZJ70. It is also fully interchangeable with assemblies supplied by BOMCO, HH, LS NOV, RG, HONGHUA, RONGSHENG, EMSCO, and other major OEM rig manufacturers.
Q
What material and surface treatment is used for the sheave?
The sheave is manufactured from 45# Alloy Steel using forged and welded construction, with mechanical properties equivalent to JIS S45C / AISI 1045 or higher-grade structural steel. The rope groove undergoes medium frequency induction hardening to significantly improve wear resistance and extend the service life of both the sheave and the wire rope.
Q
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 inspection and formal reports are available from Bureau Veritas (BV), CCS, ABS, SJS, and other recognized certification bodies.
Q
What is the expected service life of the auxiliary sheave assembly?
Under standard drilling environments, the service life is typically 8 to 10 years. The induction-hardened grooves and alloy-steel construction contribute to enhanced fatigue resistance. Periodic inspection and proper maintenance further ensure long-term reliability in both primary and auxiliary hoisting applications.
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Is the product manufactured in compliance with API 8C standards?
Yes. All auxiliary sheave assemblies are produced following internal quality standards aligned with API 8C principles, covering load integrity, structural safety, and long-term operational stability. Our API 8C certificate number is 8C-0349.
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Can custom sizes or configurations be provided?
Yes. With over ten years of dedicated sheave manufacturing experience, our factory offers custom sizing options to meet specific rig requirements. We support drilling contractors and OEM equipment builders with flexible configurations, consistent quality, and stable supply. Please contact our sales team with your technical requirements for a tailored solution.