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China Suppliers Factory Auxiliary Sheave Assembly for Drilling Rigs - Ideal for Lifting and Maintenance 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
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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.
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Durable Forged-Welded Construction
The sheave body uses a forged steel blank welded to a reinforced housing for excellent load-bearing capacity.
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Heat-Treated Rope Groove
Medium frequency induction hardening enhances wear resistance, extending both sheave and wire rope lifespan.
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Strict Quality Assurance
100% MT and UT inspection before leaving the factory ensures structural reliability for hoisting applications.
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API 8C Certified
Production standards aligned with API 8C principles. Our API 8C certificate number: 8C-0349.
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Source Manufacturer Advantages
Over ten years of production experience providing stable supply, custom sizing, and consistent quality.
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.
Contact for more details about the Auxiliary sheave assembly which used for HONGHUA, RG, RONGSHENG, EMSCO, LS NOV.
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
What is the typical service life of the Auxiliary Sheave Assembly?
In standard drilling environments, the service life is approximately 8 to 10 years. The use of induction-hardened grooves and alloy-steel construction significantly extends fatigue resistance.
Which drilling rig models are compatible with this sheave?
It is designed for common rig series including ZJ30, ZJ40, ZJ50, and ZJ70, and is fully interchangeable with assemblies from BOMCO, HH, LS NOV, and RG.
What quality inspections are performed before delivery?
We conduct 100% Magnetic Particle Testing (MT) and 100% Ultrasonic Testing (UT) on all critical welds and forged sections to ensure structural integrity.
Does the product comply with API standards?
Yes, the assemblies are produced under API 8C standards. Our specific API 8C certificate number is 8C-0349.
What materials are used in the construction?
The assembly is made from 45# Alloy Steel, utilizing forged and welded construction with mechanical properties equivalent to JIS S45C or AISI 1045 grade steel.
Can third-party inspections be arranged?
Yes, third-party witness and inspection reports are available from recognized bodies such as Bureau Veritas (BV), CCS, ABS, and SGS.