Ninthore Overseas is one of the Leading Manufacturer And Exporter of Alloy Steel B7 Washers, which are completely tested on diverse parameters so as to ensure its flawlessness. Alloy Steel B7 Flat Washers is often use in food industries, chemical industries, electrical industries, generator industries, shaft industries, cement industries, gas industries power project, etc. These Alloy Steel B7 Lock Washers further, goes through cut – off, hydrostatic testing, annealing, straightening and pickling. Alloy Steel B7 Sealing Washers are available to our clients in various thicknesses, sizes, weights and grades as per their requirements.

In addition to this, our offered range of these Alloy Steel B7 Split Washers is available in different customized options to suit various residential, commercial and other applications. Alloy Steel B7 Slot Washers has some excellent features to offer such as High strength, Heat resistance, Produce reliable and more. The higher calibers of chromium in these Alloy Steel B7 Machine Washers provide excellent corrosion and oxidation resistance, which is a must in sour gas applications.

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Taking our expertise and proficiency into consideration, we are valued as a prestigious provider of Alloy Steel B7 Star Washers, which are accurately manufactured by making use of the top grade alloy steel and cutting edge techniques at our end. We hereby also assure you of our lowest rates of these Alloy Steel B7 Spring Washers, along with best quality materials and our prompt & personalized services.

Alloy Steel B7 Washers Specifications
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.

B7 Alloy Steel Washers Chemical Composition

Alloy Steel B7 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

Mechanical Properties:

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

Alloy Steel B7 Washers Application Industries

  • Off-Shore Oil Drilling Companies
  • Power Generation
  • Petrochemicals
  • Gas Processing
  • Specialty Chemicals
  • Pharmaceuticals
  • Pharmaceutical Equipment
  • Chemical Equipment
  • Sea Water Equipment
  • Heat Exchangers
  • Condensers
  • Pulp and Paper Industry

B7 Alloy Steel Washers Test Certificates

We at Ninthore Overseas provide Manufacturer TC (Test Certificate) in accordance to EN 10204/3.1B, Raw Materials Certificate, 100% Radiography Test Report, Third Party Inspection Report. We also provide Standard certificates like EN 10204 3.1 and additional requirement like. NACE MR 01075. FERRIT CONTENT as per norms if requested by clients.

• EN 10204/3.1B,
• Raw Materials Certificate
• 100% Radiography Test Report
• Third Party Inspection Report, etc.

Material Testing

We at Ninthore Overseas ensure that all our materials go through strict quality tests before dispatching them to our clients.

• Mechanical Testing Such as Tensile of Area
• Hardness Test
• Chemical Analysis – Spectro Analysis
• Positive Material Identification – PMI Testing
• Flattening Test
• Micro and Macro Test
• Pitting Resistance Test
• Flaring Test
• Intergranular Corrosion (IGC) Test


• Commercial Invoice which includes HS Code
• Packing List including net weight and gross weight, number of boxes, Marks and Numbers
• Certificate of Origin legalized/attested by Chamber of Commerce or Embassy
• Fumigation Certificates
• Raw Material Test Reports
• Material Traceability Records
• Quality Assurance Plan (QAP)
• Heat Treatment Charts
• Test Certificates certifying NACE MR0103, NACE MR0175
• Material Test Certificates (MTC) as per EN 10204 3.1 and EN 10204 3.2
• Guarantee Letter
• NABL approved Laboratory Test Reports
• Welding Procedure Specification/Procedure Qualification Record, WPS/PQR
• Form A for the purposes of the Generalized System of Preferences (GSP)