SB81 Hydraulic Breaker Parts Excavator Breaker Side Plate Bolt 140 with Double Nuts

The 140 hydraulic breaker clamp bolt (also called through bolt / tie bolt) is the critical load-bearing fastener for 140-series hydraulic breakers. It secures upper/lower cylinders and end caps, withstanding high-frequency vibration and hydraulic pressure to prevent loosening, oil leaks, or catastrophic failure. Forged from 42CrMo alloy steel with quenching & tempering heat treatment, it balances hardness and toughness for 140 hammer’s harsh conditions. Size: 48mm diameter * 420mm length, single-end anti-loose design outperforms outdated double-threaded types, resisting loosening under heavy vibration.

Product Name

140 Hydraulic Breaker Clamp Bolt

Alias

Through Bolt, Hammer Fastening Bolt

Compatible Model

140 Series Hydraulic Breaker

Nominal Diameter

48 mm

Overall Length

420 mm

Thread Specification

Standard Metric Thread

Material

42CrMo Cr-Mo Alloy Steel

Processing

Forging & Precision Grinding

Heat Treatment

Vacuum Quenching & Tempering

Surface Treatment

Anti-rust Oxidation Treatment

Hardness

HRC 38–42

Tensile Strength

≥1200 MPa

Fatigue Resistance

High fatigue resistance, resistant to repeated impact

Anti-loose Accessory

Reinforced Nut + Lock Washer

Application

Mining, Demolition, Heavy Construction

Compared with conventional single-nut low-strength fasteners, this upgraded SB81 side plate bolt optimizes the locking structure with double-nut self-locking design, greatly improving anti-loosening performance over ordinary excavator breaker bolt products. The refined short bolt dimension perfectly matches the compact installation space of 140 series hydraulic breakers, avoiding assembly interference. This high-performance 140 hydraulic breaker short bolt with double nuts adopts upgraded alloy steel and standardized heat treatment process, boosting tensile strength and impact resistance. It effectively prevents bolt bending, fracture and thread slipping under heavy vibration and high-load breaking operations. With uniform and smooth standard threads, it ensures tight fitting and seamless assembly. Capable of maintaining stable fastening force in long-term mining, rock breaking and demolition work, it reduces frequent part replacement and cuts daily equipment maintenance costs significantly.

This clamp bolt is a high-grade fastener specially designed for 140 series hydraulic breakers. Optimized for heavy-duty working conditions including mining, earthwork, building demolition and road construction, it upgrades raw materials, manufacturing techniques and structural design comprehensively. It effectively solves common problems of conventional bolts such as loosening, fracture, poor sealing and short service life, and acts as a reliable core component to ensure stable operation of hydraulic breakers.

We adopt premium 42CrMo Cr-Mo alloy steel instead of ordinary carbon steel or regular 40Cr material widely used by other suppliers. This material features outstanding mechanical properties with high strength, superior toughness and excellent impact resistance. Under continuous high-frequency vibration, instant strong impact and mechanical torque during operation, it will not suffer from material fatigue, brittle fracture or tensile deformation, greatly improving load capacity for all-day heavy workloads.

Every production procedure follows strict industrial standards. The bolt is integrally forged to form a dense internal metal structure and enhance overall rigidity. It is processed with vacuum quenching and tempering heat treatment, keeping the hardness steadily at HRC 38-42. This balanced hardness and toughness prevents wear, impact damage and brittle fracture caused by excessive hardness. The whole body is precision ground with smooth surface, no burrs and no stress concentration points, which ensures tight fitting and avoids cracking during operation. The professional anti-rust oxidation surface treatment protects the bolt from erosion by rain, sediment and hydraulic oil, realizing long-term anti-corrosion performance even in outdoor harsh environments.

Different from traditional double-thread bolts, this product adopts an upgraded single-end integrated structure. Traditional double-thread bolts are prone to uneven tightness and gradual loosening under long-term vibration, which will lead to hammer displacement, poor cylinder sealing, hydraulic oil leakage, and even severe damage to main components like cylinders and clamps. Our single-end design is equipped with reinforced thickened nuts and lock washers to form a multi-layer anti-loose system. It greatly enhances vibration resistance and locking performance. The bolt can stay firmly tightened during long continuous operation, fixing the upper and lower cylinders tightly and maintaining excellent sealing performance to stop oil leakage and reduce equipment downtime and maintenance work.

Manufactured in strict accordance with original factory standards for 140 hydraulic breakers, the bolt is sized 48mm in diameter and 420mm in overall length with ultra-high dimensional accuracy. It supports direct installation without modification, featuring easy assembly and precise alignment. It is highly compatible with most mainstream 140-type hydraulic breakers on the market. The product has passed strict heavy-load durability tests. After over 2000 hours of continuous operation under simulated actual working conditions, it maintains perfect condition without deformation, thread slipping or breakage.

Q1: What models does this bolt fit? Is it universal?

A1:This is a dedicated clamp through bolt for 140 series hydraulic breakers, size 48mm*420mm. It is compatible with most mainstream 140-type breakers of all brands. Made to OEM standard size, direct installation without any modification. Do not use it on other breaker models, as mismatched dimensions may lead to loosening or breakage.

Q2: What material is this bolt made of? How is it different from ordinary bolts?

A2:It is forged from 42CrMo Cr-Mo alloy steel and processed with vacuum quenching and tempering, with stable hardness at HRC 38–42. It delivers excellent strength, toughness and impact resistance. Low-cost bolts are usually made of carbon steel or 40Cr, which have poor fatigue resistance and are easy to slip or break under vibration. Our product is built for heavy-duty scenarios like mining and demolition.