3/8 Flat Washer
- Buy 50 or more $0.23 Save 12%
- Buy 200 or more $0.21 Save 19%
- Buy 500 or more $0.19 Save 27%
3/8 Flat Washer
Bobco's 3/8-inch Flat Washers are essential industrial hardware components designed to distribute the load of a threaded fastener, such as a bolt or screw. By providing a smooth bearing surface, they prevent pull-through and damage to the material surface, ensuring a secure and lasting connection. These industrial-grade washers are ideal for a wide range of MRO, fabrication, and construction applications in the Los Angeles area.
- Distributes Fastener Load
- Meets ASME B18.21.1 Standards
- Low Carbon Steel
- Zinc-Plated (ASTM B633)
Manufactured from high-quality low carbon steel, our 3/8" flat washers provide excellent durability and performance in general-purpose fastening systems. They are engineered to meet the stringent dimensional and material requirements of ASME B18.21.1 standards, ensuring consistent fit and function. The standard zinc plating, conforming to ASTM B633, offers a layer of corrosion resistance, making these washers suitable for various indoor and moderate outdoor environments. Their primary function is to increase the bearing surface under a fastener's head or nut, distributing clamping force over a wider area.
These versatile washers are a staple in maintenance, repair, and operations (MRO) kits and are critical for new assembly and fabrication projects. They are compatible with Grade 2, Grade 5, and Grade 8 bolts, making them suitable for everything from light-duty framing to heavy machinery assembly. Use them in structural steel connections, equipment mounting, and general construction to improve the integrity of bolted joints. Bobco Metals keeps a large warehouse stock of 3/8 Flat Washer specifications in Los Angeles for same-day pickup.
Specifications
- Material: Low Carbon Steel
- Standards: ASME B18.21.1 (Dimensional), ASTM F844 (Material)
- Strength/Tensile: N/A; Hardness specified by ASTM F844
- Dimensions: Nominal Size: 3/8 inch
- Finish: Zinc-Plated per ASTM B633
- Certifications: Mill Test Reports (MTR) available upon request.
Applications
- Construction: Used with structural bolts to secure connections in framing, decking, and supports.
- Machinery & Equipment: Essential for assembling and mounting components, reducing vibration and distributing load.
- Automotive: Applied in chassis and body assembly to ensure proper torque and prevent surface damage.
- General Fabrication: Used in metalwork, fencing, and custom projects to provide a clean, secure bearing surface.
Target Users
Fabricators, construction contractors, mechanics, and MRO technicians rely on industrial-grade 3/8 Flat Washer units for creating reliable bolted joints. They are a fundamental component for any project involving threaded fasteners.
Finish Options
Our standard in-stock 3/8 Flat Washers come with a zinc-plated finish for moderate corrosion resistance. Other finishes, such as hot-dip galvanized for superior outdoor protection or plain steel, may be available upon request. Contact our Los Angeles team for custom finish options.
How to Measure
To specify the correct flat washer, identify the size of the bolt it will be used with. The Inside Diameter (ID) of the washer is designed to match the nominal bolt diameter, while the Outside Diameter (OD) and Thickness are standardized by ASME specifications.
Example: For use with a 3/8" bolt, simply request a '3/8 Flat Washer'.
Order Checklist
- Product name and required dimensions (e.g., 3/8")
- Grade/material specification and quantity (Boxes or Bulk)
- Cutting instructions (if applicable)
- Surface finish requirements (Zinc-Plated, Galvanized)
- Certifications required (Mill Test Report - MTR)
- Special handling or delivery requirements
Quick Facts
- Product
- 3/8 Flat Washer
- Material
- Low Carbon Steel
- Standards
- ASME B18.21.1, ASTM F844
- Key Properties
- Distributes clamping load, prevents surface damage, meets dimensional standards for consistent fit.
- Primary Applications
- Construction, MRO, Machinery Assembly, Fabrication
- Location
- Los Angeles warehouse - Same-day pickup available
Available Sizes
We stock a comprehensive range of standard flat washer sizes, from 1/4" up to 1-1/2". The 3/8 Flat Washer is one of our most common commercial hardware sizes available for immediate pickup in bulk.
Custom sizes and cutting services are available.
Contact for Sizing