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Minerallac Company 40535 - A coiled, hardened split circular lock washer with a slightly trapezoidal wire section. It is made of steel with a zinc plated finish. Key dimensions are 0.094 in thickness, 0.680 in outside diameter, and 0.385 in inside diameter.
Minerallac Company

40535

Alternate Item Number: 12113982

UPC: 085937405357

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Minimum Qty: 100

Multiplier: 100

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Overview

The Minerallac Company 3/8" Medium Split Lock Washer (SKU 40535USJ) is a coiled, hardened steel fastener with a zinc-plated finish, designed to prevent loosening under vibration, shock, or thermal expansion. Manufactured to ASTM F844 and SAE J995 specifications, this washer provides reliable performance for industrial, construction, HVAC, and electrical applications. Key specifications include a 0.094-inch thickness, 0.680-inch outside diameter, and 0.385-inch inside diameter. The split circular design features a slightly trapezoidal wire cross-section. This geometry increases surface contact pressure, enhancing clamp load and providing consistent spring action to maintain fastener tension under dynamic load conditions, thereby reducing maintenance requirements and operational downtime. This specific model (SKU 40535USJ) is available in bulk packaging, including a 1,000-piece corrugated box (SKU 40535-1000) for cost-effective procurement. For applications requiring enhanced corrosion resistance in challenging environments, an 18-8 stainless steel version is available (SKU 70535USJ). This washer is compatible with 3/8" bolts and is part of Minerallac’s comprehensive split lock washer series, which includes sizes from 1/4" to 3/4" (SKUs 40525USJ, 40537USJ, 40540USJ, 40545USJ, 40550USJ). A Split Lock Washer Kit (SKU 39517) is also offered for mixed-size applications. Ideal for securing electrical panels, machinery mounts, conduit systems, and structural assemblies where vibration resistance is a critical requirement. The zinc plating offers standard corrosion protection, while the hardened steel construction ensures long-term durability. Minerallac’s precision-engineered fasteners deliver dependable performance in demanding industrial settings.
  • Coiled, hardened steel construction with zinc-plated finish
  • 0.094" thickness, 0.680" outside diameter, 0.385" inside diameter
  • Split circular design with trapezoidal wire section for increased contact pressure
  • Prevents fastener loosening due to vibration, shock, or thermal expansion
  • Manufactured to ASTM F844 and SAE J995 specifications

Specifications

Application
Provides a hardened bearing surface, creating more uniform torque control and load distribution.
Color
Silver
Finish
Zinc Plated
Inside Diameter
0.385" IN
Material
Steel
Material
Zinc-plated hardened steel
Material
Hardened Steel with Zinc-Plated Finish
Material
Hardened Steel with Zinc Plated Finish
Material
Steel (Zinc Plated)
Material
Zinc-plated
Material
Zinc-Plated Steel
Material
Zinc Plated Steel
Material
Hardened Steel
Material
Zinc
Outside Diameter
0.680" IN
Rockwell Hardness
C38 - 43
Size
3/8 in. (0.094 in thickness, 0.680 in outside diameter, 0.385 in inside diameter)
Size
0.385 in ID, 0.680 in OD, 0.094 in thickness
Size
3/8"
Size
3/8 Inch
Size
3/8" Medium Split Lock Washer (0.094" thickness, 0.680" OD, 0.385" ID)
Size
3/8" Medium
Size
3/8
Size
3/8 in.
Special Features
Applies greater bolt tension per unit of applied torque. Resists loosening caused by vibration and corrosion.
Thickness
0.094" IN
Type
Split Lock Washer
Package Weight (Imperial)
0.6 lbs
This is a split lock washer. It is made of steel with a zinc plated finish and silver color. The washer has a thickness of 0.094", an outside diameter of 0.680", and an inside diameter of 0.385". It is described as medium and is intended to resist loosening caused by vibration and corrosion while providing a hardened bearing surface for more uniform torque control and load distribution.

40535J

This is a split lock washer. It is made of steel with a zinc plated finish and silver color. The washer has a thickness of 0.094", an outside diameter of 0.680", and an inside diameter of 0.385". It is described as medium and is intended to resist loosening caused by vibration and corrosion while providing a hardened bearing surface for more uniform torque control and load distribution.
Metric Lock Washer, Steel, Zinc finish, Fits M4 bolt sizes, 100 per pack

JMLW04

Metric Lock Washer, Steel, Zinc finish, Fits M4 bolt sizes, 100 per pack
A coiled, hardened split circular washer with a slightly trapezoidal wire section. It is made of steel with a zinc plated finish. The washer has a thickness of 0.125 in, an outside diameter of 0.869 in, and an inside diameter of 0.512 in.

40540

A coiled, hardened split circular washer with a slightly trapezoidal wire section. It is made of steel with a zinc plated finish. The washer has a thickness of 0.125 in, an outside diameter of 0.869 in, and an inside diameter of 0.512 in.
A coiled, hardened split circular lockwasher with a slightly trapezoidal wire section. It is made of steel with a zinc-plated finish and is intended to provide a hardened bearing surface for more uniform torque control and load distribution. The washer has a thickness of 0.040 in, an outside diameter of 0.293 in, and an inside diameter of 0.174 in.

40510

A coiled, hardened split circular lockwasher with a slightly trapezoidal wire section. It is made of steel with a zinc-plated finish and is intended to provide a hardened bearing surface for more uniform torque control and load distribution. The washer has a thickness of 0.040 in, an outside diameter of 0.293 in, and an inside diameter of 0.174 in.
A coiled, hardened split circular washer with a slightly trapezoidal wire section. It is made of steel with a zinc-plated finish and is intended to provide a hardened bearing surface for more uniform torque control and load distribution. The washer measures 0.031 in thick, with a 0.250 in outside diameter and a 0.148 in inside diameter.

40505

A coiled, hardened split circular washer with a slightly trapezoidal wire section. It is made of steel with a zinc-plated finish and is intended to provide a hardened bearing surface for more uniform torque control and load distribution. The washer measures 0.031 in thick, with a 0.250 in outside diameter and a 0.148 in inside diameter.
A split lock washer for use with 3/4" bolt sizes. It is made of steel with a zinc plated finish and silver color. The washer has an outside diameter of 1.265", an inside diameter of 0.780", and a thickness of 0.188". Rockwell hardness is C38 - 43.

40550

A split lock washer for use with 3/4" bolt sizes. It is made of steel with a zinc plated finish and silver color. The washer has an outside diameter of 1.265", an inside diameter of 0.780", and a thickness of 0.188". Rockwell hardness is C38 - 43.
3/8 in. split lock washer in medium size. It is made of steel with a zinc plated finish and silver color. The washer has a thickness of 0.094 in., an outside diameter of 0.680 in., and an inside diameter of 0.385 in. Rockwell hardness is C38 - 43.

40535BFG

3/8 in. split lock washer in medium size. It is made of steel with a zinc plated finish and silver color. The washer has a thickness of 0.094 in., an outside diameter of 0.680 in., and an inside diameter of 0.385 in. Rockwell hardness is C38 - 43.
This is a split lock washer with a medium profile. It is made of steel with a zinc plated finish and is silver in color. The washer is 0.094" thick, with an outside diameter of 0.680" and an inside diameter of 0.385". It is designed to apply greater bolt tension per unit of applied torque and resist loosening caused by vibration and corrosion.

40535-1000

This is a split lock washer with a medium profile. It is made of steel with a zinc plated finish and is silver in color. The washer is 0.094" thick, with an outside diameter of 0.680" and an inside diameter of 0.385". It is designed to apply greater bolt tension per unit of applied torque and resist loosening caused by vibration and corrosion.

Frequently Asked Questions

What is the size of this Minerallac split lock washer?

This Minerallac split lock washer is 3/8" in size.

What material is the Minerallac 40535 lock washer made from?

The Minerallac 40535 lock washer is made from zinc-plated steel.

What is the primary function of a split lock washer?

A split lock washer is used to prevent bolted joints from loosening, especially in applications with vibration or dynamic stress.

Is this lock washer available in different quantities?

Yes, this lock washer is available in bulk packaging of 1,000, 2,500, or 8,000 pieces.

Where are Minerallac split lock washers commonly used?

Minerallac split lock washers are suitable for industrial, construction, electrical, and mechanical assemblies.

Frequently Asked Questions about Minerallac Company

What are the main product lines offered by Minerallac Company?

Minerallac Company offers multiple comprehensive product lines including Minerallac Traditional (electrical fasteners), Strut Fittings, Stainless Steel Fasteners, Black Claw, Impact Staples, and Redmore. Their Traditional line features over a thousand electrical fastener variations covering conduit/cable/wire products, nail straps, beam clamps, metal stud & drywall accessories, acoustical supports, voice/data hardware, and miscellaneous electrical installation components.

What is Minerallac Company's warranty policy?

Minerallac Company provides a limited warranty that guarantees all products are free from defects in material and workmanship. If a product fails to meet this warranty, Minerallac's sole liability is to replace the product at no charge. The warranty is exclusive and does not cover consequential damages, lost profits, or implied warranties of merchantability or fitness for a particular purpose.

What industries and applications are Minerallac Company products used for?

Minerallac Company products are used extensively across electrical, construction, and industrial applications, including conduit and cable support, beam mounting, metal stud and drywall installation, voice/data infrastructure, and low voltage systems. Their product lines cover critical fastening solutions for electrical contractors, with specialized offerings in conduit hangers, straps, beam clamps, cable supports, and mounting hardware for various industrial environments.

What technical support does Minerallac Company offer?

Minerallac Company offers comprehensive technical support through multiple channels, including a toll-free customer service line at 800-927-3293, email support at [email protected], and online resources at www.minerallac.com. Their support covers product selection, technical specifications, and customer service for their extensive line of electrical fasteners, hangers, straps, and hardware across multiple product brands including Minerallac Traditional, Cully, Black Claw, IMPACT Staples, and Minerallac Stainless Steel. Support hours are 8:00 A.M. to 5:00 P.M. CT for their corporate office and 8:00 A.M. to 5:00 P.M. PT for their regional office.

What are the key features of Minerallac Company products?

Minerallac Company products feature a comprehensive range of electrical fasteners and hardware with exceptional versatility, including over 1,000 different sizes, styles, and finishes. Key features include multiple product lines such as Traditional, Strut Fittings, and Stainless Steel options with specialized finishes like 304/316 Stainless Steel, Hot-Dipped Galvanized, and Zinc Electroplate. Their products are engineered for electrical contractors, offering time-saving solutions with high-quality fasteners designed for durability, corrosion resistance, and worker safety across various installation environments.

What environmental ratings do Minerallac Company products have?

Minerallac Company products have robust environmental ratings, including UL 508A Type 1, 2, 3, 4, 4X, 12, and 13 certifications, CSA Type 1-4X, 12, and 13 ratings, and IEC 60529 IP66 protection. The products are WEEE and RoHS compliant, with UV and oil resistance, and can operate in extreme temperatures ranging from -55°C to 105°C, making them suitable for harsh industrial environments.

What accessories are available for Minerallac Company products?

Minerallac Company offers a comprehensive range of accessories across multiple product categories, including hardware, fasteners, and mounting solutions. Key accessories include stove bolts with nuts, wing nut washers, bar joist washers, stud clip adapters, brackets, perforated strapping, cable support options like J-hooks and bridle rings, box mounting brackets, outlet retainers, and various stud and drywall supports. Their accessories are available in multiple finishes such as stainless steel, hot-dipped galvanized, zinc electroplate, and powder-coated options.

How are Minerallac Company products typically installed?

Minerallac Company products are typically installed using a variety of specialized fastening solutions, including conduit hangers, straps, beam clamps, and mounting brackets designed for different electrical and construction applications. Installation methods vary by product type, with options for metal studs, drywall, beams, acoustical surfaces, and low voltage systems. The company offers multiple installation styles such as one-hole and two-hole straps, universal beam clamps, and specific mounting hardware to ensure secure and efficient attachment across diverse electrical and construction environments.

What communication protocols do Minerallac Company products support?

Minerallac Company's Brad product line supports multiple industrial communication protocols, including Ethernet, DeviceNet, PROFIBUS, Modbus, CANopen, Serial, AS-interface, and CC-Link. Their comprehensive portfolio covers over 40 industrial protocols, providing flexible communication solutions for various industrial automation applications from PC-based control to PLC systems.