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Ball Screw Products

Optimized Efficiency

Ball screws offer a highly efficient means of converting rotary motion to linear motion. A ball screw is an improvement over an acme screw with regards to speed, accuracy, and efficiency. Precision ball screws have a number of bearing balls that transfer the load between the nut and screw. 

  • Low friction improves speed, force, and duty cycle
  • Longer life cycle and requires less motor power 
  • Converts rotational motion into straight motion (and vice-versa)

Precision Metric Ball Screws (PMBS™)

The PMBS™ product line offers linear lead accuracy classes of T10, T7, T5, and T3 which comply to ISO 3408 ball screw standard and mounting per DIN69 051 Part 5 Type C. All ball nuts are precision ground and engineered to operate with precision rolled ball screws or precision ground (T3) ball screws with wipers at both ends (pre-loaded or clearance fit).

  • High precision rolled thread screws for high accuracy at reduced cost.
  • Maximum travel rates with repeatable positioning accuracy.
  • Provide the ultimate in repeatability and lead accuracy using preloaded ball nuts.
  • Wide range of diameters and leads.
  • State-of-the-art ball return mechanisms.
  • Custom sizes and configurations available.
  • Integral wipers

Miniature Metric Ball Screws

Nook annually produces many custom small diameter ball screws and nuts for the aerospace and medical industries. As a result of this experience, we also offer standard miniature ball screws and nuts for the commercial market.

Our small diameter screws are available in both alloy and stainless steel and a globally accepted product for smaller footprint applications requiring high accuracy, repeatability, and durability. 

  • Offered as a complete assembly
  • Screw ends can be machined to customer requirements in nearly any diameter and length 
  • Some sizes are supplied with EZZE MOUNT™ bearing supports to form a complete assembly
  • Smaller screw diameters can be enlarged by fitting a sleeve to the screw to allow mating with an EZZE MOUNT™
  • Precision thread-rolling technology
  • Wide range of diameters and leads
  • State-of-the-art ball return mechanisms
  • Custom sizes and configurations available

 

Single Nut with Flange

Ball Nuts available in Internal Returns with a pilot diameter for ease of installation.

Single Nut with V-Thread

Ball Nuts available in External Returns, Internal Returns, and a Cylindrical Body.

Cylindrical Single Nut with Keyway

Cylindrical nut offers a solution for use in a housing (lube port provided).

Standard Accuracy (SRT)

Standard Rolled Thread (commercial/transport) provide the low friction advantage of anti-friction screws at lower cost. They are capable of higher speeds and longer predictable life when compared to similar acme lead screws.

  • Diameters from 3/8" to 6" and leads from .125" to 1.875"  Manufactured from the same high quality materials and ISO certified procedures as higher precision screws.
  • Most are rolled, induction heat treated and black oxide coated. Three sizes are also available in 17-4 PH stainless steel.
  • Offered with OD threaded, non-preloaded ball nuts. Some sizes available with integral flange nuts and/or with double nuts. Double nuts have a spring loaded adjustable preloading feature for eliminating backlash.
  • For convenience SRT screws can be supplied completely machined and assembled with nuts, flanges, wipers and EZZE-MOUNTS ready for assembly to your product.

Nook easy to install assemblies are turn key solutions that only require a power source. Available for quick delivery from shelf stock.

Should a standard assembly not fit the application, Nook can machine the screw to your specific design requirements.

Inch Standard Accuracy Ball Screw

Will not deviate from nominal lead by more than ±.004 inch/foot on screws through 2 1/2" diameter and ±.008 in/ft on screws 3" and over.

Inch Standard Accuracy Twin-Lead Ball Screw Assembly

Can be assembled with Nook, PowerTrac™ ball nuts, flanges and EZZE-MOUNT™ bearing supports for cost effective systems.

Precision Accuracy (SGT and XPR)

XPR

Precision Rolled Thread ball screws utilize the latest in CNC thread rolling technology and state of the art CNC induction heat treatment for accuracy approaching precision ground at a substantially lower cost. They are ideal for applications that don’t warrant the expense for ground screws but still require more precise positioning than that offered by commercial grade screws.

  • Offered with internally preloaded non-adjustable ball nuts with either an integral flange or an OD thread which allows for the use of a custom flange to fit a specific need.

SGT

Standard Ground Thread ball screws are ground from high carbon alloy steel that has been induction heat treated to a depth greater than the thread. Standard stocked inch precision ball screws have a lead accuracy tolerance of ±0.0005 in/ft and are supplied with internally preloaded nuts (must be factory assembled). They are ideal for applications that require smooth operation, precise positioning, and repeatability.

Both can be supplied completely machined and assembled with nuts and EZZE-MOUNTS ready for assembly.

Should a standard assembly not fit the application, Nook can machine the screw to your specific design requirements

SGT - Inch Precision Accuracy Ball Screw
  • Will not deviate from nominal lead by more than ±.0005 inch/foot.
XPR - Inch Precision Accuracy Ball Screw
  • Will not deviate from nominal lead by more than ±.001 inch/foot.
Inch Precision Accuracy Twin-Lead Ball Screw

PowerTrac™ SGT Twin Lead Ball Screws will not deviate from nominal lead by more than ±.0005 inch/foot.

Inch Precision Accuracy Twin-Lead Ball Screw Assembly

SGN Standard Ground Nuts assembled with SGT Twin Lead Ball Screws.

Standard Accuracy (SRT)

MRT Rolled Ball Screws are manufactured under tightly controlled conditions in the rolling process. Uniform heat treatment is monitored by temperature sensors to ensure high quality and accurate lead.

  • 100µm / 300mm lead accuracy ball screws with high efficiency and long life. Offered in diameters from 16m to 63mm with leads from 5mm to 50mm.
  • Economical, high-performance alternative to ground thread ball screw assemblies to ensure accuracy, consistent repeatability, and high system stiffness at low running torque.
  • Metric Ball nuts can be assembled with a selective fit to minimize lash. Nook provides quality end machining of the rolled ball screw to standard or custom configurations. Can be fitted to Nook Ezze Mounts for simple system integration.
Metric Standard Accuracy Ball Nut
  • Durable, low cost solution with both External and Internal return nut styles in various metric sizes (No preload).
  • Mounting flanges and wiper kits can be installed.
Metric Standard Accuracy Ball Screw

Will not deviate from nominal lead by more than ±100 μm/300 mm.

Precision Accuracy (PMT)

PMT Precision Rolled Ball Screw are manufactured under tightly controlled conditions in the rolling process. Uniform heat treatment is monitored by temperature sensors to ensure high quality and accurate lead.

  • 25µm / 300mm lead accuracy ball screws with high efficiency and long life. Offered in diameters from 16m to 63mm.
  • Feature 25µm/300mm lead accuracy ball screws with precision ground preloaded ball nuts that are an economical, high-performance alternative to ground thread ball screw assemblies.
  • Preloaded ball nut assemblies ensure accuracy, zero backlash, consistent repeatability, and high system stiffness at low running torque.
  • Ball nuts feature a unique solid preload that enhances system smoothness, and are factory-fit on the ball screws, providing a backlash-free system for long life.