When Standard Tools Are Not Enough

Not every fastening application can be solved with an off-the-shelf product. Limited access, unusual fastener locations, high reaction torque, and unique production requirements often require customized tooling designed specifically for the application.

Working closely with our customers, NMS develops custom fastening solutions that improve accessibility, increase productivity, and maintain tightening accuracy while integrating seamlessly with existing production equipment. From custom torque wrench heads to specialized geared attachments and reaction fixtures, our engineering team helps transform difficult fastening applications into reliable production processes.

From Concept to Production
Every custom solution begins with understanding the customer’s assembly challenge. Our engineering process typically includes:

  1. Application review 
  2. Joint analysis 
  3. Concept development 
  4. CAD design 
  5. 3D printed prototype (when required) 
  6. Customer evaluation 
  7. Final manufacturing 
  8. Production implementation 

Our Custom Engineering Solutions
Custom Spanner Heads, extend the capability of torque wrenches for inaccessible fasteners. Many tightening applications cannot be reached using standard interchangeable heads.

NMS designs and manufactures custom spanner heads compatible with Tohnichi CSP interchangeable torque wrench bodies, allowing customers to maintain calibrated tightening accuracy while accessing difficult fastening locations.

Our custom heads have been successfully supplied for a wide range of automotive, industrial machinery, and special assembly applications.

Typical designs include:

  • Offset heads 
  • Extended reach heads 
  • Special opening sizes 
  • Deep access heads 
  • Thin profile heads 
  • Customer-specific geometries 

Geared Drive Heads : Transmit torque into spaces where conventional tools cannot operate.

Some fasteners are positioned where there is insufficient clearance for a standard shutoff wrench or screwdriver. Our geared drive heads redirect torque through precision gear mechanisms, allowing pneumatic or cordless shutoff tools to tighten fasteners in confined spaces while maintaining fastening performance. Available configurations include:

  • Hold & Drive 
  • Open Rotating Spanner 
  • Closed Rotating Spanner 

These solutions are commonly used in automotive assembly, powertrain production, and industrial equipment manufacturing.

Torque Reaction  Jigs
Control reaction force while improving operator safety. High-torque fastening often generates significant reaction forces that can affect operator comfort, tightening consistency, and workplace safety.

NMS designs custom reaction fixtures that securely absorb tightening reaction while allowing the fastening process to remain stable and repeatable.

Benefits include:

  • Improved operator safety 
  • Better tightening consistency 
  • Reduced operator fatigue 
  • Improved ergonomics 
  • Increased productivity 

3D Printed Prototype Service : Validate the design before manufacturing.
Many custom fastening heads are used inside extremely confined assemblies where even detailed CAD models cannot fully demonstrate real-world accessibility.

To reduce project risk, NMS offers rapid 3D printed prototypes that allow customers to physically evaluate the proposed design before final manufacturing. Customers can verify:

  • Tool accessibility 
  • Fastener engagement 
  • Clearance to surrounding components 
  • Operator handling 
  • Assembly sequence 
  • Potential design improvements 

By identifying issues early, prototype evaluation helps reduce development time while avoiding costly design revisions after production tooling has been manufactured.

Why Choose a Custom Solution?

A customized fastening solution can often eliminate production problems that cannot be solved by standard catalog products.

Typical benefits include:


  • Reach inaccessible fasteners 
  • Improve tightening accuracy 
  • Reduce assembly time 
  • Increase operator safety 
  • Improve ergonomics 
  • Maintain calibration accuracy 
  • Eliminate unnecessary production modifications 
  • Support automation projects 

Industries We Support
Our custom fastening solutions have been supplied for:

  • Automotive manufacturing 
  • Electric vehicle production 
  • Electronics 
  • Industrial machinery 
  • Heavy equipment 
  • Aerospace 
  • Special machinery 
  • General manufacturing 

Engineering Support

Every application is unique. Our engineering team works closely with customers from concept through production to develop fastening solutions that meet the specific requirements of their assembly process.

Whether modifying an existing tool or creating an entirely new fastening solution, we help manufacturers overcome challenging assembly applications while maintaining quality and productivity.

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