M4 Split Lock Washer EASTLO 304 Stainless Steel Bright Finish Pack 100

Description

Product Overview

The M4 Split Lock Washer from EASTLO is a precision-engineered fastener created to secure M4 size bolts in demanding industrial environments. Made from 304 stainless steel, the washer features a bright, mirror-like finish that resists corrosion, rust, and staining even when exposed to moisture, chemicals, or extreme temperature fluctuations. Its split lock design includes a small gap that allows the washer to flex slightly under load, generating a constant clamping force that prevents bolt loosening caused by vibration, thermal expansion, or dynamic stress. With an outer diameter of 6.8 mm, an inner diameter of 4.4 mm, a compressed height of 1.2 mm and an uncompressed height of 2.75 mm, the washer provides a reliable interface between the bolt head and the mating surface, distributing load evenly and protecting the underlying material from damage.

Each package contains 100 washers carefully packed in a compact box measuring 3.27 × 2.52 × 0.67 inches and weighing only 1.13 ounces, making storage and handling simple for inventory managers and assembly line workers. The bright silver tone of the washers not only enhances visual inspection but also matches a wide range of component finishes, allowing seamless integration into existing assemblies without aesthetic mismatch. The product model IW600102-100, released in January 2021, has earned a solid reputation on major marketplaces, ranking #65 in the Spring Lock Washers subcategory and receiving an average rating of 4.5 stars from 69 verified customers, reflecting consistent performance and satisfaction.

The M4 Split Lock Washer is compatible with a broad spectrum of hardware, including steel, aluminum, and plastic substrates. Its stainless-steel composition ensures that the washer will not gall or seize against the bolt, preserving the integrity of both parts over repeated assembly and disassembly cycles. Engineers and technicians often select this washer for applications such as machinery frames, automotive brackets, electrical enclosures, and HVAC units where reliable vibration damping and long-term corrosion resistance are essential. The washer’s compact profile also makes it suitable for tight spaces where traditional lock washers might be too thick to fit.

EASTLO adheres to rigorous quality control procedures, testing each batch of washers for dimensional accuracy, tensile strength, and corrosion resistance in accordance with ISO 9001 standards. The 304 stainless steel grade provides a minimum tensile strength of 520 MPa, ensuring that the washer can withstand high preload forces without permanent deformation. Additionally, the bright finish is achieved through a controlled polishing process that eliminates surface imperfections, delivering a consistent appearance and performance across the entire pack of 100 units.

Extensive testing validates the washer’s performance under simulated field conditions. Samples are subjected to cyclic loading, salt spray exposure, and temperature cycling to confirm that the split lock mechanism maintains its clamping force and that the stainless-steel surface resists pitting and discoloration. Test results consistently meet or exceed industry benchmarks for lock washers, giving engineers confidence that the product will perform reliably throughout the lifespan of the equipment.

Usage

The M4 Split Lock Washer is ideal for any situation where a bolt must remain tight despite continuous vibration or thermal cycling. Its split lock mechanism automatically compensates for minor movements, maintaining a secure joint in equipment such as pumps, compressors, and conveyor systems. By placing the washer directly under the bolt head or nut, users achieve a self-locking effect that reduces the need for additional locking compounds or safety wires.

In automotive repair, the washer protects engine brackets and suspension components from rust and loosening, extending service intervals and improving vehicle reliability. In the electrical sector, it safeguards conduit clamps and panel fasteners against moisture-induced corrosion, ensuring long-term electrical safety. Facility maintenance teams also rely on these washers for HVAC ductwork, fire-suppression piping, and structural steel connections where consistent torque retention is critical.

Installation is straightforward: select the appropriate M4 size washer, position it on the bolt shaft with the split side oriented away from the tightening direction, and tighten the fastener to the recommended torque value. The washer’s thin profile (1.2 mm when compressed) allows it to sit flush against the mating surface, preventing protrusion that could interfere with adjacent components. For best results, clean the contact surfaces of oil, debris, or old thread-locker before assembly.

Regular inspection of assembled joints helps detect early signs of wear or corrosion. When a washer shows surface damage or loss of elasticity, it should be replaced to preserve the locking capability. Because the M4 Split Lock Washer is made from 304 stainless steel, it can be cleaned with mild detergents and a soft brush without compromising its protective finish, extending service life in maintenance cycles.

Why Choose Us

EASTLO’s commitment to quality is reflected in the meticulous manufacturing process used for every M4 Split Lock Washer. The use of premium 304 stainless steel, combined with a bright polishing finish, guarantees resistance to rust, staining, and chemical attack, even in harsh industrial settings. Each washer undergoes dimensional inspection to ensure that the outer and inner diameters fall within tight tolerances, delivering consistent performance across the entire 100-piece pack.

Customers benefit from EASTLO’s responsive after-sales service, which includes technical assistance, replacement options, and a clear warranty policy. The company’s extensive distribution network ensures rapid delivery to warehouses and job sites, minimizing downtime for projects that depend on reliable fastener supplies. Positive buyer feedback, reflected in a 4.5-star rating from 69 reviewers, underscores the brand’s reputation for dependable products and attentive support.

Choosing the M4 Split Lock Washer from EASTLO provides a cost-effective solution without compromising durability. The pack of 100 units offers ample inventory for bulk purchasing, reducing per-unit cost and simplifying re-order processes. Moreover, the washer’s versatile design makes it suitable for a wide range of applications, eliminating the need to stock multiple specialized lock washers and streamlining inventory management for maintenance teams.

EASTLO prioritizes environmentally responsible manufacturing by sourcing stainless steel from certified recyclers and employing energy-efficient polishing processes. The bright finish reduces the need for additional protective coatings, lowering material waste. By offering a high-quality, long-lasting product, the company helps customers reduce replacement frequency, contributing to lower overall resource consumption and a smaller carbon footprint.

Key Features

• Premium 304 stainless steel provides excellent corrosion resistance and long-term durability.
• Bright silver finish allows quick visual inspection and blends with most hardware colors.
• Split lock design creates a self-locking effect that prevents bolt loosening under vibration.
• Thin compressed height of 1.2 mm fits into tight spaces while delivering strong clamping force.
• EASTLO offers responsive customer support and warranty coverage for peace of mind.

FAQ

What size bolt is this washer compatible with?

The washer is designed for M4 size bolts, fitting an inner diameter of 4.4 mm and providing a secure lock for standard M4 fasteners.

Can the washer be used in corrosive environments?

Yes. Made from 304 stainless steel with a bright finish, the washer resists rust, chemical exposure, and moisture, making it suitable for marine, chemical processing, and outdoor applications.

How many washers are included in one package?

Each package contains 100 split lock washers, packed in a compact box for easy storage and handling.

What is the recommended torque for installing the washer?

For optimal performance, tighten the bolt to the manufacturer’s torque specification for the specific application, typically between 2.5 and 4.0 Nm for M4 fasteners. The split lock washer will maintain its clamping force within this range.