Nestled in the heart of Hamilton’s industrial sector, Latham Steel has built a reputation as a trusted partner for demanding projects. We combine local expertise with a commitment to supplying components that are built to last, including the specialized Alloy Steel Gr B7M Washer. We understand that reliability starts with the materials you choose, which is why we focus on providing high-integrity hardware engineered to meet the toughest challenges. Our team is dedicated to ensuring you have the right components to keep your operations running safely and efficiently.
The Alloy Steel Gr B7M Washer is carefully formulated, primarily from chromium and molybdenum, to create its distinct character. This specific composition is the key to its impressive mechanical strength and, more importantly, its exceptional resistance to sulfide stress cracking. The material undergoes a precise quenching and tempering heat treatment, resulting in a hardness that typically falls within the range of 237 to 293 Brinell. This balance ensures the washer is robust enough for high-pressure applications without becoming brittle.
| Specifications | : | ASTM A 193 ASME SA 193 |
| 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 B7M | C | Mn | P | S | Si | Cr | Mo |
| 0.37-0.49 | 0.65-1.10 | 0.035 Max | 0.04 Max | 0.15-0.35 | 0.75-1.20 | 0.15-0.25 |
| Grade | Size | Tensile ksi, min | Yield, ksi, min | Elong, %, min | RA % min |
|---|---|---|---|---|---|
| B7M | 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 the oil and gas industry, where they are essential for flanges and valves in sour service environments containing hydrogen sulfide. Their resistance to corrosive cracking also makes them invaluable in chemical processing plants and in demanding offshore applications. Essentially, wherever high tensile strength must be paired with a defense against aggressive, corrosive elements, the Grade B7M washer provides a reliable and safety-critical solution for securing bolted joints under extreme pressure.
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
