This is a high-strength stainless steel fastener made from SUS 304CUN.
SUS 304CUN is an austenitic stainless steel (A2) that boasts high strength (A2-90, A2-100), high heat resistance, high corrosion resistance, and non-magnetic properties, making it a strong and rust-resistant high-strength material. By adding copper (CU) and nitrogen (N), it is possible to increase strength while ensuring non-magnetic properties, and it has stress corrosion cracking resistance comparable to SUS 316. Furthermore, SUS 304N2, which is SUS 304 with added nitrogen (N) and niobium (Nb), is a stainless steel that enhances strength while minimizing the reduction in ductility. It is used in structural strength members and high-pressure vessels. High-strength stainless steel washers that can withstand A2-100 specifications using SUS 304N2 have also been developed. These washers prevent plastic deformation (dimpling) around the holes of the mating components that occurs during tightening with high-strength fasteners, providing a locking effect against loosening.
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basic information
**Features** ■ High Strength - Tensile strength of 900–1,000 N/mm² - Achieved mass production level of A2-90/100, which is outside the mechanical property standards for austenitic materials JIS B1054 - Comparable high strength to SUH 660 and SCM 435 ■ Untreated - Strength increase possible through cold forging only (A2-90) - No concerns about market complaints due to heat treatment processes (aging cracks, delayed fractures) ■ High Heat Resistance - No carbon precipitation occurs at 500–700℃ - High temperature range for grain boundary corrosion ■ High Corrosion Resistance - Stress corrosion cracking resistance comparable to SUS 316 ■ Non-Magnetic - Permeability (μ) of 1.01–1.03 ■ Weight Reduction - Overall weight reduction by changing from A2-50 to A2-90 - Possible 70% weight reduction by reducing the nominal diameter by three sizes (changing from A2-50 to A2-100 with a yield strength of 900 MPa allows for changing from M20 to M12) ■ Convenience - Domestic product with high adaptability and flexibility
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Detailed information
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【Lineup】 ■ SUS 304CUN A2-100 Hexagon Socket Bolt ・Product Standard: JIS B1176 Part Grade A ・Material: SUS 304CUN ・Thread Standard: JIS B0205/B0209 ・Thread Accuracy: 6g ・Surface Treatment: Passivation ・Strength Class: A2-90 A2-100 ・Tensile Strength: 900N/mm² 1,000N/mm² ・Yield Strength: 700N/mm² 800N/mm² ・Aging Treatment: None Yes
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■ SUS 304CUN A2-100 Hexagon Socket Bolt ・Product Standard: JIS B1176 Part Grade A ・Material: SUS 304CUN ・Thread Standard: JIS B0205/B0209 ・Thread Accuracy: 6g ・Surface Treatment: Passivated ・Strength Class: A2-100 ・Tensile Strength: 1,000N/mm² ・Yield Strength: 800N/mm² ・Aging Treatment: Yes
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■ SUS 304CUN A2-100 Low Head Hexagon Socket Bolt ・Material : SUS 304CUN ・Thread Standard : JIS B0205/B0209 ・Thread Accuracy : 6g ・Surface Treatment : Passivated ・Strength Class : A2-100 ・Tensile Strength : 1,000N/mm² ・Yield Strength : 800N/mm² ・Aging Treatment : Yes
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■ SUS 304CUN A2-100 High Tension Nut ・Product Standard: JIS B1181 Hex Nut Style 2 Part Grade A (M20 is Part Grade B) Both Sides Machined ・Material: SUS 304CUN ・Thread Accuracy: 6H ・Surface Treatment: Passivated ・Strength Class: A2-100 ・Guaranteed Load: 1,000N/mm²
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■ SUS 304CUN E-LOCK Nut ・Manufacturing Standard: JIS B1181, processed from the main standard (Style 2) * The flat diameter (across corners) for M10 and M12 is reduced by 1mm compared to the old JIS based on the new JIS. ・Material: Nut body: SUS 304CUN Friction ring: SUS 301-CSP EH (black oxide) ・Thread Accuracy: 6H ・Strength Class: A2-100 ・Guaranteed Load: 1,000N/mm²
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■ SUS 304CUN A2-90 Cut Bolt ・Material : SUS 304CUN ・Thread Accuracy: 6g ・Strength Class : A2-90 ・Guaranteed Load : 900N/mm²
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■ SUS 304N2 High Tension Washer HV300 ・Material : SUS 304N2 ・Surface Treatment : Passivation ・Hardness : HV300
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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.