
310Express Company is the export division of the SAIMA Group
SAIMA, the core company of the SAIMA Group, is a manufacturer specialized in technically advanced screw and fastener solutions.
Within Japan, we not only produce our proprietary SAIMA PB Fasteners but also offer technical consultations for a wide range of fastening issues, such as:
- Anti-loosening solutions
- Torque management
- Tapping screw pilot hole recommendations
- Prevention of bolt breakage
At 310Express Company, we also handle these kinds of technical consultations.
Even at more basic stages, we support design decisions like:
- Choosing between pan head and truss head screws
- Selecting between hex socket, hexalobular, or Torx drive systems
- Deciding whether to use stainless steel A2 or A4
- Choosing between Grade 2 and Grade 5 titanium screws
- Addressing red rust from nickel plating and exploring better plating alternatives
- Resolving white rust issues with trivalent chromate treatments

Japan has an abundant inventory of highly specialized and diverse screws.
At 310Ex, we maintain a strong network with Japan’s expert fastener suppliers, enabling us to respond to technical inquiries from customers and mechanical designers all over the world.
【Writer】Tak Saima/CEO, Technical Sales