High-strength hex socket bolt Unbrako
Optimal for specifications requiring high strength and high tension Robust hex socket bolts that can withstand high tightening torque 【Features】 ○ By shaving off the pre-formed high top portion, the chamfered area is eliminated, allowing for a deeper engagement with the wrench, enabling a higher tightening torque. ○ The neck fillet section adopts a composite R known as an elliptical fillet, reducing stress concentration, possessing four times the strength of standard products, and preventing neck breakage accidents. ○ The bottom of the screw valley is raised by approximately 17%, increasing the valley R to enhance durability. ○ The head is molded in two stages. By maximizing the seating surface area, the tightening force is effectively transmitted to the counterpart material, ensuring thorough consideration against seating surface collapse. ○ Thanks to advanced heat treatment technology developed through the design and mass production of aerospace screws, it guarantees a strength of 130-140 kgf/mm² while also ensuring a 9% elongation rate.
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Optimal for specifications requiring high strength and high tension Robust hex socket bolts that can withstand high tightening torque 【Features】 ○ By shaving off the pre-formed elevated top section, the chamfered area is eliminated, deepening the effective engagement with the wrench, allowing for a higher tightening torque. ○ The neck fillet section employs a composite R known as an elliptical fillet, reducing stress concentration, possessing four times the strength of standard products, and preventing neck breakage accidents. ○ The bottom of the screw valley is raised by approximately 17%, increasing the radius of the valley for enhanced durability. ○ The head is molded in two stages. By maximizing the seating surface area, the tightening force is effectively transmitted to the counterpart material, ensuring thorough consideration for seat surface collapse. ○ Thanks to advanced heat treatment technology developed through the design and mass production of aerospace screws, it guarantees a strength of 130-140 kgf/mm² while also ensuring a 9% elongation rate.
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Our company was established in 1961 as "Japan Ambraco" to sell hex socket bolts "Ambraco" products in the Japanese market by SPS Technologies, Inc. in the United States. In 1984, we changed our name to "SPS Ambraco" and obtained Japanese corporate status as a 100% subsidiary of SPS. Since then, we have supplied Boeing standard parts to various heavy industries that began producing parts for the 767 and 777, and we are involved as a key supplier for the 787. In 2000, we started selling products from Penn Engineering (PEM), a manufacturer of clinching nuts, and since 2004, we have been handling high-strength stainless bolts "BUMAX," continuing our contributions in the field of industrial equipment for civilian use. In 2003, Precision Castparts Corp. (PCC) in the United States conducted an M&A. In 2017, we changed our name to "PCC Distribution Japan" and became part of the PCC group, which is under the capital umbrella of Berkshire Hathaway, led by renowned investor Warren Buffett, continuing to import and sell high-value-added industrial components loved in the global market.