Agalma Sourcing

Contract assembly and box build companies in Sonora, Mexico

Plants that assemble finished products from your parts and subassemblies: box build, electromechanical assembly, kitting, and packout. Profiles say whether they buy the parts (turnkey) or use yours (consigned). We list 101 contract assembly manufacturers in Sonora. 11 have researched profiles with capabilities quoted from their own websites, and 30 are confirmed to take outside orders.

Describe your part to rank these suppliers for your job:

Top 30 of 101

Researched profiles first, then by size · Updated October 15, 2026

  1. Fabricación de Componentes Electrónicos

    Nogales, Sonora·251+ employees·Contract manufacturer

    • ✓Electromechanical assembly

    “EDS Manufacturing, Inc. is an IATF 16949 and ISO 9001 certified world-class supplier of electrical wire harnesses, battery cables, and electro-mechanical assemblies to the Automoti…”

    edsmanufacturing.comTakes outside ordersProfile →
  2. Mefasa

    Agua Prieta, Sonora·251+ employees·Contract manufacturer

    • ✓Electromechanical assembly

    “Manufactura Y Ensamble de: MOTORES, ROTORES, BRUSH BLOCKS, PC BOARDS, ARNESES, CAPSULAS, SLIP RINGS, SLIP RINGS PLATTERS, FIBRA OPTICA y CONECTORES.”

    mefasa.orgTakes outside ordersProfile →
  3. Circuit Works Corporation Mexico

    Agua Prieta, Sonora·251+ employees·Contract manufacturer

    • ✓Final assembly and box build
    • ✓ISO 13485
    • ✓ISO 9001

    “All our associates are trained in workmanship and inspection — assembling to any IPC Class (1–3) standard.”

    cwcems.comTakes outside ordersProfile →
  4. Integrated Cable Assembly y Holdings

    Nogales, Sonora·251+ employees·Contract manufacturer

    • ✓Electromechanical assembly

    “Wire Harness, Cable Assembly & Electromechanical Manufacturer”

    icaholdings.comTakes outside ordersProfile →
  5. NAI Planta 2 Palo Verde 1

    Hermosillo, Sonora·251+ employees·Contract manufacturer

    • ✓Electromechanical assembly

    “electro-mechanical assemblies”

    nai-group.comTakes outside ordersProfile →
  6. Necontech de Mexico

    Hermosillo, Sonora·101–250 employees·Contract manufacturer

    • ✓Electromechanical assembly
    • ✓IMMEX
    • ✓ISO 9001

    “Operating Stamping, Molding & Assembly 24 hours a day”

    newconcepttech.comTakes outside ordersProfile →
  7. Demsa

    Imuris, Sonora·101–250 employees·Contract manufacturer

    • ✓Electromechanical assembly
    • ✓IMMEX
    • ✓ISO 9001
    • ✓UL

    “Imuris, Sonora — Manufacturing. Our 80,000 square foot production facility in Imuris is where the building happens: wire harness assembly, electrical and mechanical sub-assembly, t…”

    micromex.comTakes outside ordersProfile →
  8. Pencom CSS de Mexico

    Nogales, Sonora·101–250 employees·Job shop

    • ✓Final assembly and box build
    • ✓AS9100
    • ✓ISO 9001
    • ✓NADCAP

    “For those looking for additional services, PENCOM-Nogales offers in-house anodizing, passivating, welding, and assembly capabilities.”

    pencomsf.comTakes outside ordersProfile →
  9. American Precision Assemblers de Mexico

    Hermosillo, Sonora·101–250 employees·Contract manufacturer

    • ✓Final assembly and box build
    • ✓Electromechanical assembly

    “At APA, box build contract manufacturing is among our core competencies.”

    apaconnects.comTakes outside ordersProfile →
  10. LG Automation

    Hermosillo, Sonora·51–100 employees·Contract manufacturer

    • ~Final assembly and box build
    • ✓Electromechanical assembly

    “We have specialized in the design and manufacturing of fully automated assembly machines and work stations.”

    lgautomation.com.mxTakes outside ordersProfile →
  11. Amphenol Alden

    Hermosillo, Sonora·251+ employees·Contract manufacturer

    • ~Final assembly and box build
    • ~Electromechanical assembly
    amphenolalden.comTakes outside ordersProfile →
  12. Latecoere

    Hermosillo, Sonora·251+ employees·Job shop

    • ~Final assembly and box build
    latecoere.aeroTakes outside ordersProfile →
  13. FlexNot yet researched

    San Luis Río Colorado, Sonora·251+ employees·Contract manufacturer

    • ~Final assembly and box build
    • ~Electromechanical assembly
    flex.comTakes outside ordersProfile →
  14. ICAGNot yet researched

    Nogales, Sonora·101–250 employees·Contract manufacturer

    • ~Final assembly and box build
    • ~Electromechanical assembly
    icag.bizTakes outside ordersProfile →
  15. Charles e Gillman Company

    Nogales, Sonora·101–250 employees·Contract manufacturer

    • ~Electromechanical assembly
    • ✓ISO 9001
    gillman.comTakes outside ordersProfile →
  16. Metal Master IndustrialNot yet researched

    Nacozari de García, Sonora·101–250 employees·Job shop

    • ~Final assembly and box build
    mmi.mxTakes outside ordersProfile →
  17. Sonitronies HitranNot yet researched

    Nogales, Sonora·101–250 employees·Job shop

    • ~Final assembly and box build
    • ~Electromechanical assembly
    hitran.comTakes outside ordersProfile →
  18. US Wire Group

    Hermosillo, Sonora·101–250 employees·Contract manufacturer

    • ~Electromechanical assembly
    us-wire-harness.comTakes outside ordersProfile →
  19. MesabiNot yet researched

    Hermosillo, Sonora·51–100 employees·Job shop

    • ~Final assembly and box build
    • ~Electromechanical assembly
    mesabi.com.mxTakes outside ordersProfile →
  20. Mobiliario de Azar

    San Luis Río Colorado, Sonora·51–100 employees·Private label

    • ~Final assembly and box build
    angelplayingcards.comTakes outside ordersProfile →
  21. Carrocerias y Remolques Kuzzy

    Hermosillo, Sonora·31–50 employees·Job shop

    • ~Final assembly and box build
    kuzzy.comTakes outside ordersProfile →
  22. CIP Centro de Innovacion y Prototipado

    Hermosillo, Sonora·31–50 employees·Job shop

    • ~Final assembly and box build
    • ~Electromechanical assembly
    cipautomation.comTakes outside ordersProfile →
  23. Girsa

    Navojoa, Sonora·31–50 employees·Job shop

    • ~Final assembly and box build
    grupogirsa.comTakes outside ordersProfile →
  24. Manufacturas Especializadas en Sistema de Refrigeracion

    Hermosillo, Sonora·31–50 employees·Job shop

    • ~Final assembly and box build
    • ~Electromechanical assembly
    mer-sa.com.mxTakes outside ordersProfile →
  25. Neon Aa A

    Hermosillo, Sonora·11–30 employees·Job shop

    • ~Final assembly and box build
    neonaaa.comTakes outside ordersProfile →
  26. Signos Anuncios

    Hermosillo, Sonora·11–30 employees·Job shop

    • ~Final assembly and box build
    signosanuncios.comTakes outside ordersProfile →
  27. Metalmecanica RLC

    Hermosillo, Sonora·11–30 employees·Job shop

    • ~Final assembly and box build
    • ~Electromechanical assembly
    rlc.com.mxTakes outside ordersProfile →
  28. Industrial COM

    Hermosillo, Sonora·11–30 employees·Job shop

    • ~Final assembly and box build
    • ~Electromechanical assembly
    industrialcom.com.mxTakes outside ordersProfile →
  29. ContinentalNot yet researched

    Nogales, Sonora·251+ employees·Electrical and electronic equipment and parts manufacturing for motor vehicles

    • ~Electromechanical assembly
    continental.comProfile →
  30. Cooper Standard Automotive FHSNot yet researched

    Empalme, Sonora·251+ employees·Other motor vehicle parts manufacturing

    • ~Electromechanical assembly
    Profile →

71 more. Search to see suppliers ranked for your part