California Precision.
Japanese Mastery.
SMI CA, Inc. combines Southern California's AS9100D-certified manufacturing with over 65 years of Japanese spring engineering expertise through our founding partnership with TOHOSEIKO Co., Ltd.
About SMI CA, Inc.
SMI CA, Inc. (Saeilo Manufacturing Industries) is a Southern California contract manufacturer based in Santa Fe Springs — delivering high-precision CNC machining, custom springs, and automation equipment to the world's most demanding industries.
As an AS9100D and ISO 9001:2015 certified facility, SMI-CA holds itself to the same exacting standards trusted by aerospace primes, medical device OEMs, and defense contractors. From complex aluminum airframe components to micro-scale wire springs, every part leaves our facility with full traceability and documented quality control.
What sets SMI-CA apart is our ability to develop and fabricate custom automation equipment in-house — including the proprietary Temperboy series of spring tempering systems — enabling tighter process control and faster turnaround than suppliers dependent on third-party tooling.
About TOHOSEIKO
Founded in December 1957 by Toshio Okamoto in Toyooka City, Hyogo Prefecture, Japan, TOHOSEIKO Co., Ltd. has spent over six decades building a reputation as one of the world's foremost precision spring manufacturers.
Guided by the philosophy of "Contribute to The World with Reliable Technology," TOHOSEIKO specializes in wire springs, flat springs, and custom special springs for industries demanding the tightest tolerances — from optical devices and medical equipment to aerospace and consumer electronics.
Their in-house equipment development capability — including the proprietary Temperboy series of tempering systems — sets them apart from standard spring suppliers and serves as the foundation for SMI-CA's own automation capabilities.
TOHOSEIKO in Action
A Partnership Built on Precision
In March 2018, TOHOSEIKO Co., Ltd. established an investment partnership with SMI CA, Inc. — bringing Japan's most advanced spring manufacturing technology directly to Southern California's aerospace and medical supply chain.
Spring Capabilities
Through our TOHOSEIKO partnership, SMI-CA offers the full spectrum of precision spring types — from ultra-fine micro springs to long special springs for surgical instruments.
Global Network
TOHOSEIKO Co., Ltd.
404-1 Shimokage, Toyooka City, Hyogo 〒668-0012
Founded 1957 · 104 employees · 4,669 m² site
TOHOSEIKO Precision Springs (Shanghai)
No. 47, No. 11 Debao Road, Shanghai Pilot Free Trade Zone · 115 employees · ISO 9001 / 14001 / TS16949
TOHOSEIKO Engineering Inc.
Pacific Trade Centre, 17/F, Kowloon Bay · Regional sales and distribution hub for Southeast Asia
SMI CA, Inc.
14340 Iseli Road, Santa Fe Springs, CA 90670 · Partnership established March 2018 · AS9100D & ISO 9001:2015 certified
Certifications & Recognition
