ASME B18.22.1 USS Flat Washer Carbon Steel Zinc Plated

Product Overview

ASME B18.22.1 USS Flat Washer Carbon Steel Zinc Plated is an oversized flat washer engineered to ASME B18.22.1 industry standard. Specifically built for UNC & UNF inch bolt assemblies, it features a wider outer diameter than regular SAE washers. This design evenly spreads clamping force over a larger contact surface, preventing indentation and surface damage on substrates. Widely adopted in machinery assembly, trailer fabrication, solar mounting frames and steel structure connections.

As a professional fastener manufacturer, our company completes the full production workflow in-house, from raw steel stamping, edge deburring, surface coating to final QC inspection. We maintain ready stock of popular inch sizes, supporting sample orders, small batch purchases and large-volume structural projects.

Key Features

- Premium carbon steel base with zinc plated finish for reliable indoor corrosion resistance

- Oversized OD design, distributes bolt load broadly to protect workpiece surface

- Strictly manufactured to ASME B18.22.1 inch standard, fully compatible with UNC/UNF bolts and threaded rods

- Multiple inch sizes in stock: 1/4", 3/8", 1/2", 5/8", 3/4", 7/8", 1"; custom non-standard sizes available upon request

ASME B18.22.1 USS Flat Washer Carbon Steel Zinc Plated is produced on our calibrated stamping lines. Each production step is monitored to control dimensions, flatness and edge quality. Burr-free finish and stable dimensional tolerance guarantee consistent performance under high torque and static load for industrial fastening.

Technical Specifications

Surface Finish Selection

Applications

ASME B18.22.1 USS Flat Washer Carbon Steel Zinc Plated pairs perfectly with inch hex bolts, heavy hex nuts and full-thread threaded rods. It serves heavy-duty industries including equipment assembly, trailer manufacturing, photovoltaic bracket installation and steel beam connection. The enlarged contact area greatly enhances joint stability under vibration and static loads.

Customization Service

Beyond standard stocked sizes of ASME B18.22.1 USS washers, we support tailored solutions for special project demands. We can adjust raw material composition, edge treatment and coating parameters to match unique working conditions. Send us your drawings or technical requirements, and our technical team will evaluate and offer feasible solutions for your custom orders.

Quality & Packing

We implement a complete quality management system. Raw material incoming inspection, in-process monitoring and finished goods sampling check are performed for every batch. Our QC team checks outer diameter, inner diameter, thickness and coating appearance before shipment.

In addition to dimensional inspection, we also conduct hardness testing on carbon steel washers to ensure consistent material performance and reliable load-bearing capacity under industrial fastening conditions. ISO certification can be provided for your supplier audit and project tender.

Products are packed in export cartons, labeled with size and finish information, then stacked on wooden pallets for safe sea or land shipment. Custom marking, private labels and customized packaging are available for bulk orders.

Why Choose Gangtong Zheli

Ningbo Gangtong Zheli Fasteners Co., Ltd. is a professional fastener manufacturer with rich export experience. We produce ASME inch standard washers in-house, strictly following ASME B18.22.1 specifications. Our integrated production line ensures stable dimension accuracy and consistent surface finish for ASME B18.22.1 USS Flat Washer Carbon Steel Zinc Plated.

We maintain ready stock of popular inch sizes and offer flexible order volumes, covering sample requests, small batch purchases and large structural project orders. Our QC team carries out full-process inspection, and we can provide relevant certification documents to support your supplier audit and bidding projects.

We provide responsive pre-sales and after-sales support for global buyers. Our engineering team can assist you with size selection and technical inquiries for your fastening projects. We understand overseas shipping requirements and prepare proper export documents to make your procurement smooth.

FAQ

Q: What is the difference between USS washer and SAE flat washer?

A: With the same nominal bolt size, USS washers have a larger outer diameter. The wider contact area distributes fastening load better, ideal for structural connections.

Q: Does ASME B18.22.1 USS washer have metric sizes?

A: No. This standard only defines inch dimensions for UNC/UNF bolts. Metric large washers follow DIN9021 and are not interchangeable.

Q: Can I get samples of ASME B18.22.1 USS Flat Washer Carbon Steel Zinc Plated?

A: Yes. Free samples are available, customers only need to bear the courier freight.

Q: What surface finishes can you supply?

A: Zinc plated is our standard option. Black oxide and hot dip galvanized finishes are also available for different application environments.