Quick Specs

What Buyers Should Know Before Sourcing DIN 7349 Heavy Duty Washers

DIN 7349 washers are often chosen when a standard flat washer is too thin for the joint condition. The heavier washer body helps spread load over a larger bearing area and gives better support around holes, slots, soft base materials, or painted surfaces. Buyers sourcing them with industrial bolts should confirm the full assembly condition, not only the washer size.

In factory production, small details matter. A washer that meets nominal diameter but has burrs, uneven coating, mixed thickness, or incorrect hole size can slow down installation. For repeat orders, XZ Fastener recommends locking the drawing, coating, hardness expectation, packing label format, and inspection method before releasing mass production.

Common Purchasing Descriptions

For combined orders, buyers can review related fastener products and request washers, bolts, and nuts in one quotation package.

Detailed Specifications Table

Material and Grade Explanation

DIN 7349 heavy duty washers are usually selected for bearing support, so material choice should match the bolt strength and the joint surface. For general machinery, carbon steel may be enough. For high-load equipment or structural assemblies, buyers may request controlled hardness or alloy steel according to project documents.

When washers are supplied with high-strength fasteners, the washer must not become the weak part of the assembly. The washer face should remain stable under tightening load, and the hole should allow proper bolt fit after coating.

Surface Finish Selection Guide

The finish should be selected by service environment, assembly method, and storage condition. Black finish is common for indoor machinery. Zinc plating is often used where a clean appearance and moderate corrosion protection are needed. Hot dip galvanizing is preferred for outdoor use, but the buyer should confirm coating build-up and hole clearance.

For projects where bolts, nuts, and washers need the same coating system, XZ Fastener can coordinate washer supply with related coated fasteners.

Manufacturing and Quality Control

Stable washer production depends on raw material control, blanking accuracy, deburring, heat treatment when required, surface finishing, final inspection, and packing discipline. For factory orders, XZ Fastener focuses on repeatable dimensions and clean sorting so the customer can use the washers directly on the production line or project site.

1. Confirm DIN 7349 dimensions, drawing revisions, size list, and order quantity.
2. Check material and hardness requirements before raw material preparation.
3. Control inside diameter, outside diameter, thickness, flatness, and burr condition.
4. Inspect coating appearance and thickness when plating or galvanizing is specified.
5. Pack by size, finish, and lot with clear labels for warehouse and installation control.

If the washer requires non-standard dimensions, buyers can use XZ Fastener’s custom fasteners support to confirm drawings before production.

Applications

DIN 7349 washers can also be ordered with other standard fasteners when the purchasing team wants one coordinated shipment.

How to Get a Faster Quotation

A clear RFQ helps the factory quote faster and reduces back-and-forth confirmation. For DIN 7349 heavy duty washers, the most useful information is the washer size list, finish, quantity, packing rule, and any inspection document needed by the buyer or project owner.

• Send nominal washer sizes and quantity per size.
• State DIN 7349 or provide a drawing for non-standard dimensions.
• Confirm material, hardness requirement, and finish.
• List packing requirements such as bags, cartons, pallets, labels, or barcodes.
• Specify inspection reports, coating checks, and any third-party inspection need.

For direct support, buyers can contact XZ Fastener with the size list and project requirement.

FAQ