Operating from the heart of Hamilton’s industrial landscape, Latham Steel has built a trusted reputation as a manufacturer and supplier dedicated to precision and durability. We understand that the integrity of a project often rests on the smallest components, which is why we take great pride in producing our Alloy Steel Gr B7 Washer. Our commitment is to deliver a fastener accessory that consistently meets the rigorous demands of heavy industry, providing our customers with a reliable foundation for their most critical assemblies.
The strength of this washer comes from its specific composition, primarily chromium and molybdenum, which give it distinct characteristics. This alloy mix allows the washer to be heat-treated, resulting in a high tensile strength and excellent resistance to creeping under sustained tension. It’s specifically engineered to handle high-pressure and high-temperature environments, maintaining its clamping force where standard washers would fail. This ensures the bolt preload is effectively maintained, which is vital for the safety and longevity of the entire joint.
| Specifications | : | ASTM A 194 ASME SA 194 |
| Standard | : | IS, ASTM, BS and all International Standards |
| Length | : | 3 mm to 200 mm |
| Size | : | M3 – M56 | 3/6″ to 2″ | Custom Sizes |
| Type | : | Flat Washer, Lock Washer, Sealing Washer, Split Washer, Slot Washer, Machine Washer, Star Washer SPRINGS – Wire Spring & Flat Spring. |
| Alloy Steel GR 7 | C | Mn | P | S | Si | Mo | Cr |
| 0.37-0.49% | 0.65-1.10% | 0.04% | 0.04% | 0.15-0.035% | 0.15-0.25% | 0.75-1.20% |
| Grade | Size | Tensile ksi, min | Yield, ksi, min | Elong, %, min | RA % min |
|---|---|---|---|---|---|
| B7 | Up to 2-1/2 | 125 | 105 | 16 | 50 |
| 2-5/8 – 4 | 115 | 95 | 16 | 50 | |
| 4-1/8 – 7 | 100 | 75 | 18 | 50 |
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
You’ll typically find these washers playing a crucial role in demanding settings like oil and gas pipelines, power generation plants, and heavy machinery. They are the preferred choice for use with B7 studs and bolts in pressure vessel flanges, valve assemblies, and other high-stress connections. Essentially, anywhere that involves elevated temperatures and significant pressure, the Grade B7 washer provides the necessary support to prevent the bolted joint from loosening, making it a fundamental component for safety and operational reliability in critical infrastructure projects.
Latham Steel is a leading manufacturer, supplier and exporter of high-quality Carbon Steel, Alloy Steel, Mild Steel and Galvanized Steel products. Our extensive product range includes Pipes, Tubes, Flanges, Pipe Fittings, Forged Fittings, Sheets and Plates, catering to various industries in Hamilton, New Zealand.
Copyright 2025 Latham Steel. All rights reserved
