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INCh AND METRIC BALL SCREW ASSEMBLY
MANUFACTURING PROCCESSES AND MATERIALS
BALL SCREW MANUFACTURING PROCESSES
BALL NUT STYLES
Inch and Metric Ball Screw Manufacturing Processes and Materials PDF
Ball Manufacturing Processes and Materials PDF
BALL SCREW MANUFACTURING PROCESSES


INCH SRT, XPR and SGT BALL SCREWS
All ball screws are manufactured under controlled rolling or grinding processes. Heat treatment is controlled to guarantee consistent high quality. PowerTrac™ Ball Screws are manufactured from high quality alloy steel, induction hardened to Rc 58-60.

SRT ball screws are given a protective black oxide finish. XPR and SGT ball screws are provided with a polished finish. Selected sizes are available in heat-treated stainless steel (Rc 40-45) for applications in corrosive environments. (SEE chart below)

PowerTrac™ SRT rolled alloy or stainless steel ball screw assemblies
feature ±0.004"/ft lead accuracy.
PowerTrac™ XPR precision rolled ball screw assemblies
feature ±0.001"/ft lead accuracy.
PowerTrac™ SGT precision ground ball screw assemblies
feature ±0.0005"/ft lead accuracy.

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METRIC MRT aND PMT BALL SCREWS
These screw assemblies are similar in construction and materials to PowerTrac™ Inch Ball Screws.

PowerTrac™ MRT Standard lead accuracy: ±100µm / 300mm
PowerTrac™ PMT Standard lead accuracy: ±25µm / 300mm

METRIC CARRY BALL SCREWS
PowerTrac™ Carry™ Metric Rolled Ball Screws are hardworking and durable. Designed for applications which require predictable life while moving a load with high efficiency and duty cycle. These screws are economical and maintain lead accuracy that is appropriate for most industrial applications. Made of hardened alloy or stainless steel.

CARRY™ Standard lead accuracy: ±100µm / 300mm
(±50µm / 300mm available on request).

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BALL NUT MATERIALS AND STYLES

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Nut specifications can be found through the Ball Product Selection pages. Flange and nut dimensions are listed with the screw data.

INCH SRT, XPR and SGT BALL NUTS
PowerTrac™ Ball Nuts are manufactured from carburized steel with ball tracks heat treated to Rc 58-60.

 

Ball Nut Types

SBN Standard Ball Nut (no preload) for SRT screw –
offer durable, low cost linear motion. Mounting flanges and wiper kits can be installed on the SBN nuts.

SGN Standard Ground Nut (“V” thread, no preload)
for SRT, XPR or SGT Screw –

are similar to SBN style ball nuts and have internal threads that are ground into the ball nut body. These nuts provide smooth, precise operation on rolled thread or ground thread ball screws.

SEL Standard Easy-Loc Adjustable Preload Ball Nut for SRT Screw –
designed to eliminate the axial play or movement associated with standard ball nuts. Mounting flanges and wiper kits can be installed on the SEL nuts.

SAR Standard Adjustable Preload Ball Nut Ground Ball Groove,
Integral Flange & Wipers) for SRT Screw –

offer the same high performance features found in precision ground thread ball nut assemblies with the added ability to run on rolled thread or ground thread screws. The SAR ball nut features adjustable preload, ground ball races, integral flange and wipers. The precision ground flange assures alignment of the nut preventing unnecessary wear.

SAG Standard Adjustable Preload Ball Nut
(Ground Ball Groove, Integral Flange and Wipers) for SGT Screw –

offer the precision tolerances of ground ball screw systems with the flexibility of adjustable preload.

PRN Standard Internal Preload Nut (“V” thread end with wipers)
for XPR or SGT Screws –

has a preload that is created by shifted internal threads that areground in a single set-up. The resulting concentricity assures uniform preload. The PRN ball nuts are compact and stiff due to the single nut integral preload configuration. Factory fitting on ball screws provides a backlash-free system with uniform torque, high stiffness and long life.

SSN Standard Internal Preload Nut (Integral flange and wipers)
for XPR or SGT Screws –

have the same features as the PRN nut design while incorporating an integral flange.

METRIC MRT aND PMT BALL NUTS
These screw assemblies are similar in construction and materials to PowerTrac™ Inch Ball Nuts.

Temperature Range for standard applications: -20° to +80° C
Wipers: Plastic

METRIC CARRY BALL NUTS
Made of hardened alloy or stainless steel PowerTrac™ Carry™ ball screws are matched with a range of durable ball nuts with either external low-profile returns or internal returns. Their compact shape enhances the inherent advantages of ball screw design.

Temperature Range for standard applications: -20° to +80° C
Wipers: Plastic or brush

Carry Type Z Internal Return Nut
Carry Type Z Lo-Profile Return Nut
TYPE Z: Internal return or Low-Profile Return
Carry Type FG Internal Return Nut
Carry Type FG Lo-Profile Return Nut
TYPE FG: Internal Return or Low-Profile External Return
Carry Type FB Internal Return Nut
Carry Type FB Lo-Profile Return Nut
TYPE FB: Internal Return or Low-Profile External Return
Carry Type 16 x 50 Internal Return Nut
16x50: Internal Return

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