Thread-Craft, Inc.
ANABISO 9001:2008 & AS9100:2009 Rev C Registered

Custom Ball Screw Manufacturing

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At Thread-Craft, we've been in business and supplying custom ball screws, lead screws and precision machined components to Fortune 500 customers in the aerospace, defense, military, and general industrial markets for more than 50 years. We operate a modern facility staffed with professional craftsmen expert at fabricating precision ground, rolled thread, and commercial ball screw assemblies. Unlike OEM's with limited production flexibility, Thread-Craft can manufacture virtually every return system used in the market today;  internal flopover, external return tubes, or even hybrid return systems. Offered in sizes up to 4" dia x 35' length, or 6" dia x 15' length. Our custom products provide mission-critical accuracies of up to 0.0002 in./ft to meet the performance requirements of the most demanding applications. No one has more precision CNC thread grinders, experienced assemblers or more technical capabilities than Thread-Craft.

Constructed from case hardened alloys for long life operation, our custom ball screws can be designed with a choice of return systems, with virtually any lead and either full radius or Gothic arch thread forms. All external return assemblies feature seamless return tubes, and all internal flopover designs are mechanically shelved and assembled from the inside of the ballnut as a safety feature. All ball screws have and nylon, brush, or felt wiper seals to protect the bearings from contamination. High precision and high performance are guaranteed - our rigorous quality management system meets ISO 9001:2008 as well as AS9100: 2009 Rev C standards, and our lab houses the most accurate test and inspection equipment available today.

Custom Ball - Screw Manufacturing
Custom Ball - Screw Manufacturing

Request for Quote

At Thread-Craft, we pride ourselves at being responsive, flexible, and adaptive. To learn more about our custom ball screws and how they can improve your application, contact us today.

Examples of Our Work

Custom Ball Screw Capabilities

Product Name
Precision Ground Ball Screws
Rolled Thread Ball Screws
OEM Replacement Ball Screws
Machine Tool Ball Screws
Acme Retrofit Ball Screws
Process Thread Grinding
Ball Screw Types Precision Ground
Rolled / Commercial
Ball Screw Shaft
Ball Nut
Ball Return System
Wiper Seals
Ball Bearings
Return Systems
Button / Flopover
End Return / Cap
Return Tube
Single Ball Nut
Double Nut
Thread Forms Full Radius
Gothic Arch
Materials Ball Screw Shaft: 4150 PHT & Induction Hardened
Ball Nut: 8620 / 9310 Controlled Carburization Hardened
Return Tubes: 4130 Seamless Tubing
Wiper Seals: Nylon, Brush or Felt
Ball Bearings: 52100 Chrome Steel Grade 25
440C Stainless Steel
Diameter Up to 6.5 in
Length Up to 38 ft
Lead Error 0.0002 in/ft
Conformity Ratio .52 to .65
Contact Angle 35 to 50°
Optimum 45°
Oil Vactra #2 (Smaller Machines)
Vactra #4 (Larger Machines)
Grease Mobilgrease 28 (Break-In)
Kluberplex BEM 34-132 (Lifetime)
Coordinate Measuring Machine
Optical Comparators
Hardness Checking
Lead Checking
Surface Finish Checking
Load Testing (tension & compression) Up to 12,000 lbs and 1300 RPM
Additional Capabilities
OD / ID Grinding
Surface Grinding
Reverse Engineering
Production Volume Prototype to Medium Volume
Lead Time New Manufacture: 6 to 8 weeks
Engineered: 8 to 10 weeks
Warranty 12 month In-Service

Additional Information

Industry Focus
Industry Standards
ISO 9001:2008
AS9100 C:2009
File Formats MasterCAM
Siemens NX 8.0
Multiple CAD formats

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