Double Linear Ball Bearings
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Double linear ball bearing, closed, with a 30mm ID (inner diameter). Featuring a heat-treated alloy steel shell for durability, a resin retainer polymer cage for reduced noise and a low coefficient of friction for speed. Handles cantilevered loads better than plain bearings, overcoming the 2:1 binding ratio limitation of plain..
$118.02
Double linear ball bearing, closed, with a 12mm ID (inner diameter). Featuring a heat-treated alloy steel shell for durability, a resin retainer polymer cage for reduced noise and a low coefficient of friction for speed. Handles cantilevered loads better than plain bearings, overcoming the 2:1 binding ratio limitation of plain..
$33.28
Double linear ball bearing, closed, with a 16mm ID (inner diameter). Featuring a heat-treated alloy steel shell for durability, a resin retainer polymer cage for reduced noise and a low coefficient of friction for speed. Handles cantilevered loads better than plain bearings, overcoming the 2:1 binding ratio limitation of plain..
$39.13
Double linear ball bearing, closed, with a 1" inner diameter (ID). The twin-size format equals two standard linear ball bearings mounted back-to-back for added stability. Its ball bearing design provides a low coefficient of friction and offers an advantage in cantilevered applications where plain bearings may be limited by the..
$68.08
Double linear ball bearing, closed, with a 5/8" inner diameter (ID). The twin-size format equals two standard linear ball bearings mounted back-to-back for added stability. Its ball bearing design provides a low coefficient of friction and offers an advantage in cantilevered applications where plain bearings may be limited by the..
$34.18
Double linear ball bearing, closed, with a 1/2" inner diameter (ID). The twin-size format equals two standard linear ball bearings mounted back-to-back for added stability. Its ball bearing design provides a low coefficient of friction and offers an advantage in cantilevered applications where plain bearings may be limited by the..
$32.67
Double linear ball bearing, closed, with a 3/4" inner diameter (ID). The twin-size format equals two standard linear ball bearings mounted back-to-back for added stability. Its ball bearing design provides a low coefficient of friction and offers an advantage in cantilevered applications where plain bearings may be limited by the..
$38.15
Double linear ball bearing, closed, with a 50mm ID (inner diameter). Featuring a heat-treated alloy steel shell for durability, a resin retainer polymer cage for reduced noise and a low coefficient of friction for speed. Handles cantilevered loads better than plain bearings, overcoming the 2:1 binding ratio limitation of plain..
$236.45
Double linear ball bearing, closed, with a 40mm ID (inner diameter). Featuring a heat-treated alloy steel shell for durability, a resin retainer polymer cage for reduced noise and a low coefficient of friction for speed. Handles cantilevered loads better than plain bearings, overcoming the 2:1 binding ratio limitation of plain..
$136.94
Double linear ball bearing, closed, with a 20mm ID (inner diameter). Featuring a heat-treated alloy steel shell for durability, a resin retainer polymer cage for reduced noise and a low coefficient of friction for speed. Handles cantilevered loads better than plain bearings, overcoming the 2:1 binding ratio limitation of plain..
$48.14
Double linear ball bearing, closed, with a 25mm ID (inner diameter). Featuring a heat-treated alloy steel shell for durability, a resin retainer polymer cage for reduced noise and a low coefficient of friction for speed. Handles cantilevered loads better than plain bearings, overcoming the 2:1 binding ratio limitation of plain..
$70.00
Double linear ball bearing, closed, with a 1.25" inner diameter (ID). The twin-size format equals two standard linear ball bearings mounted back-to-back for added stability. Its ball bearing design provides a low coefficient of friction and offers an advantage in cantilevered applications where plain bearings may be limited by the..
$114.27
Double linear ball bearing, closed, with a 1.5" inner diameter (ID). The twin-size format equals two standard linear ball bearings mounted back-to-back for added stability. Its ball bearing design provides a low coefficient of friction and offers an advantage in cantilevered applications where plain bearings may be limited by the..
$136.58
Double linear ball bearing, closed, with a 2" inner diameter (ID). The twin-size format equals two standard linear ball bearings mounted back-to-back for added stability. Its ball bearing design provides a low coefficient of friction and offers an advantage in cantilevered applications where plain bearings may be limited by the..
$233.62
Linear ball bearing, double-sized and closed, with a 50mm ID JIS Metric, featuring a double wide heat-treated alloy steel shell for greater durability and higher load capacity under cantilevered conditions. Double seals add protection, a low coefficient of friction enables higher speeds, and a resin retainer polymer cage reduces noise...
$240.93
Linear ball bearing, double-sized and closed, with a 20mm ID JIS Metric, featuring a double wide heat-treated alloy steel shell for greater durability and higher load capacity under cantilevered conditions. Double seals add protection, a low coefficient of friction enables higher speeds, and a resin retainer polymer cage reduces noise...
$48.12
Linear ball bearing, double-sized and closed, with a 30mm ID JIS Metric, featuring a double wide heat-treated alloy steel shell for greater durability and higher load capacity under cantilevered conditions. Double seals add protection, a low coefficient of friction enables higher speeds, and a resin retainer polymer cage reduces noise...
$117.18
Linear ball bearing, double-sized and closed, with a 40mm ID JIS Metric, featuring a double wide heat-treated alloy steel shell for greater durability and higher load capacity under cantilevered conditions. Double seals add protection, a low coefficient of friction enables higher speeds, and a resin retainer polymer cage reduces noise...
$136.42
Linear ball bearing, double-sized and closed, with a 25mm ID JIS Metric, featuring a double wide heat-treated alloy steel shell for greater durability and higher load capacity under cantilevered conditions. Double seals add protection, a low coefficient of friction enables higher speeds, and a resin retainer polymer cage reduces noise...
$69.96
Linear ball bearing, double-sized and closed, with an 8mm ID JIS Metric, featuring a double wide heat-treated alloy steel shell for greater durability and higher load capacity under cantilevered conditions. Double seals add protection, a low coefficient of friction enables higher speeds, and a resin retainer polymer cage reduces noise...
$30.43
Twin-sized linear ball bearings are extended-length linear bearings that use recirculating balls for fast, low-friction travel on round linear shafts. While plain linear bearings can bind when cantilevered loads exceed the common 2:1 ratio guideline, twin-sized linear ball bearings help support higher moments and offset loads by providing the equivalent support of two standard-sized bearings mounted back to back. The longer bearing surface improves rigidity, load distribution, and shaft guidance, helping reduce rocking, twisting, and deflection when supporting overhung components or applications with greater moment-load requirements.
Each bearing features a steel outer cylinder for strength and dimensional stability, a polymer ball retainer that guides the recirculating balls quietly for consistent motion, hardened steel balls for low-friction rolling contact, and two double seals to help retain lubrication and protect against contamination. Available in inch, metric, and JIS sizing options, these bearings are fully interchangeable with industry-standard linear ball bearings and the Simplicity® series. ID sizes range from 0.25 in to 2 in and 8 mm to 50 mm. Flanged twin-sized variants are also available with end and center mounts.
- Double size is the equivalent of two standard-sized bearings mounted back to back
- Flanged ball bearings available with center and end mounts
- Static load capacities up to 3,500 lb (15,900 N)
- Dynamic load capacities up to 1,300 lb (6,000 N)
- Static moment capacities up to 290 ft-lb (399 Nm)
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