Amazon.co.jp: Iron (SCM435)/Trivalent Black Hex Bolt, Strength Classification: 10.9 [Made of Japanese Zipper] (Full Thread) M6 x 10 (Pack of 10) : Industrial & Scientific
Amazon.com: (10 pcs) M20-2.5 X 130mm, DIN 931 / ISO 4014, Metric, Hex Head Cap Screws Bolts, Part Thread, Class 10.9 Steel, Plain : Industrial & Scientific
Amazon.com: (10 pcs) M20-2.5 X 110mm, DIN 931 / ISO 4014, Metric, Hex Head Cap Screws Bolts, Part Thread, Class 10.9 Steel, Plain : Industrial & Scientific
Amazon.com: Class 10.9 Steel Bolts M20 x 2.5 mm x 90 mm Long PT 5 pcs : Industrial & Scientific