BUMAX combines strength and corrosion resistance.
**Features** - High Strength: 4 times the yield strength of SUS304 (A2-50) and 2 times that of SUS316 (A4-70) - Corrosion Resistance: No corrosion observed even after 10 years of testing in marine environments - Heat Resistance: Maximum operating temperature in the atmosphere is 600°C - Non-Magnetic: Excellent non-magnetic properties with a permeability of 1.006 (BUMAX 88) - Anti-Seizing: Friction coefficient during bolt tightening is less than 50% of that of SUS316 - Low Cost: Conversion of expensive nickel alloys into affordable BUMAX bolts - Environment: Reduces CO₂ and achieves a clean environment
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basic information
For specifications and materials, please refer to the "Detailed Information" below.
Price information
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Applications/Examples of results
【Applications】 ■ Platforms (marine structures) ■ Subsea laying equipment ■ Particle accelerators ■ Chemical plants ■ Nuclear power plants ■ Hydroelectric power ■ Tankers ■ Screws ■ Transmissions ■ Turbochargers ■ Pressure boilers ■ Paper production lines
Detailed information
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【Lineup】 ■ BUMAX 88・109 Hexagon Socket Bolts ・Product Standards: ISO 4762, JIS B1176, EN 4762, DIN 912 ・Material: A4-SS 2343 316L HiMo ・Thread Standards: ISO 261/262, JIS B0205/B0209 ・Thread Tolerance: 6g ・Strength Class: Class 80 Class 100 ・Tensile Strength: 800N/mm² 1,000N/mm² ・Yield Strength: 640N/mm² 900N/mm² ・Shear Strength: 520N/mm² 650N/mm² ・Elongation: 0.3d 0.2d ・Operating Temperature: -200℃ to 500℃ -200℃ to 600℃
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■ BUMAX 88 Hexagon Socket Head Cap Screw ・Product Standards: ISO 10642, JIS B1194, DIN 7991 ・Material: A4-SS 2343 316L HiMo ・Thread Standards: ISO 261/262, JIS B0205/B0209 ・Thread Accuracy: 6g ・Strength Class: Class 80 ・Tensile Strength: 800N/mm² ・Yield Strength: 640N/mm² ・Shear Strength: 520N/mm² ・Elongation: 0.3d ・Operating Temperature: -200℃ to 500℃
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■ BUMAX 88 Stud Bolt ・Product Standard: DIN 976 ・Material: A4-SS 2343 316L HiMo ・Thread Standard: ISO 261/262, JIS B0205/B0209 ・Thread Accuracy: 6g ・Strength Class: Class 80 ・Tensile Strength: 800N/mm² ・Yield Strength: 640N/mm² ・Shear Strength: 520N/mm² ・Elongation: 0.3d ・Operating Temperature: -200℃ to 500℃
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■ BUMAX 88・109 Hex Bolts ・Product Standards: ISO 4014/4017, JIS B1180 ・Material: A4-SS 2343 316L HiMo ・Thread Standards: ISO 261/262, JIS B0205/B0209 ・Thread Accuracy: 6g ・Strength Class: Class 80 Class 100 ・Tensile Strength: 800N/mm² 1,000N/mm² ・Yield Strength: 640N/mm² 900N/mm² ・Shear Strength: 520N/mm² 650N/mm² ・Elongation: 0.3d 0.2d ・Operating Temperature: -200℃ to 500℃ -200℃ to 600℃
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■ BUMAX 88・109 Hex Nut ・Product Standards: ISO 4032, JIS B1181 ・Material: A4-SS 2343 316L HiMo ・Thread Standards: ISO 261/262, JIS B0205/B0209, ISO 4161 (Flange) ・Thread Accuracy: 6H ・Strength Class: Class 80 Class 100 ・Guaranteed Load: 800N/mm² 1,000N/mm²
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■ BUMAX 88・109 Flat Washers ・Product Standards: ISO 7089, JIS B1256, DIN 125 ・Material: A4-SS 2343 316L HiMo ・Strength Class: For Class 80 For Class 100 ・Hardness: HV200 HV300
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■ BUMAX 88 Locking Nut (Free Spin Type, All Metal Lock Nut) ・Product Standards: ISO 4032, JIS B1181 ・Material: A4-SS 2343 316L HiMo ・Thread Standards: ISO 261/262, JIS B0205/B0209, ISO 4161 (Flanged), DIN 6923 (Flanged) ・Thread Accuracy: 6H ・Strength Class: Class 80 ・Guaranteed Load: 800N/mm²
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■ BUMAX DX 129 Duplex Stainless Steel Hexagon Socket Bolt ・Product Standards: ISO 4762, JIS B1176, DIN 912 ・Material: Duplex Stainless Steel * Equivalent to SUS 329J3L ・Thread Standards: ISO 261/262, JIS B0205/B0209 ・Thread Accuracy: 6g ・PRE Value: >34 * PRE Value (Pitting Resistance Equivalent): Pitting Index ・Tensile Strength: 1,200N/mm² ・Yield Strength: 1,080N/mm² ・Elongation: 0.3d ・Heat Resistance Temperature: 300°C ・Magnetic Property: Present
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Company information
Tobimoto Sangyo Co., Ltd. was established as a specialized trading company for screws and fastening parts in Tanimachi, Osaka City, shortly after World War II, where many shops dealing in machinery and tools lined the streets. Today, we have built over 75 years of history in the Osaka Machinery Wholesale District (commonly known as the Machinery District) located in Higashi-Osaka City, a town of small and medium-sized enterprises. Screws and fastening parts are used in various industries as the unsung heroes behind the scenes. They may not be very noticeable, but they are essential products without which assembly cannot take place. We take great joy and pride in having specialized in these screws and fastening parts for many years. Our ability to continue our business activities over the years is thanks to our customers and all the stakeholders who support us. We wish to maintain this sense of gratitude and continue to build trust with our customers in the future. With the mission of “providing the best solutions for all our customers,” we will continue to work together as a team to contribute, albeit modestly, to the development of our customers and society. We kindly ask for your continued support.