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China Auxiliary Sheave Assembly for Drilling Rigs - Reliable Suppliers & Factory for Efficient Wire Rope 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, SJS etc. | |
Product Features
API 8C Certified — No. 8C-0349
10+ Years Manufacturing Experience
100% MT & UT Pre-Delivery Inspection
OEM Interchangeability
Compatible with BOMCO, HH, LS NOV, RG & more
Heat-Treated Groove
Induction hardening for maximum wear resistance
Strict QA Control
MT & UT inspection on every assembly
Forged-Welded Build
High load capacity under cyclic rope loads
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.
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.
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
Q
What is an auxiliary sheave assembly and what role does it play on a drilling rig?
An auxiliary sheave assembly is a functional pulley component mounted on the mast or hoisting structure of a land drilling rig. It redirects the wire rope during auxiliary lifting operations, helping maintain proper tension, alignment, and operating stability throughout the hoisting system. Although smaller than crown blocks or traveling blocks, it plays a critical role in the overall reliability of the rig.
Q
Which rig models is this auxiliary sheave assembly compatible with?
This auxiliary sheave assembly is designed for mast structure attachment points or auxiliary hoisting brackets on common rig series including ZJ30, ZJ40, ZJ50, and ZJ70, covering rigs ranging from 1000 HP to 3000 HP. It is also fully interchangeable with assemblies supplied by BOMCO, HH, LS NOV, RG, HONGHUA, RONGSHENG, EMSCO, and other major OEM manufacturers.
Q
What quality standards and inspections does the auxiliary sheave assembly meet?
Every assembly is produced in alignment with API 8C principles (certificate number: 8C-0349) and undergoes 100% Magnetic Particle Testing (MT) and 100% Ultrasonic Testing (UT) on critical welds and forged sections before delivery. Third-party inspection reports are available from Bureau Veritas (BV), CCS, ABS, SJS, and others upon request.
Q
What is the expected service life of the auxiliary sheave assembly?
Under standard drilling environments, the expected service life is 8 to 10 years. The induction-hardened rope grooves and alloy-steel construction significantly extend fatigue resistance. Regular periodic inspections further ensure long-term reliability in both primary and auxiliary hoisting applications.
Q
What material is used in the sheave body, and why is induction hardening applied to the groove?
The sheave body is manufactured from 45# Alloy Steel (equivalent to JIS S45C / AISI 1045 or higher-grade structural steel) using forged and welded construction for superior load-bearing capacity. Medium frequency induction hardening is applied to the rope groove to enhance surface wear resistance, which extends both the sheave lifespan and the operational life of the wire rope running through it.
Q
Can custom sizes or configurations be ordered, and how do I get a quote?
Yes. As a source manufacturer with over ten years of sheave production experience, we offer custom sizing options and configurations to meet specific project requirements. Whether you need a direct OEM replacement or a tailored solution for a particular rig model, please contact our sales team with your technical specifications for a detailed quotation and reference documentation.