DEF Series Telescopic Linear Guides

The DE Series is a high capacity telescopic rail assembly where the stroke is approximately equal to the overall length of the rail assembly.   This series is constructed with cold drawn steel rails that are hardened to provide long life even in equipment with highly repetitive motion.  The bearing system consists of large diameter, caged balls.   The large balls and hardened steel raceways result in high load capacities and long product life.

Threaded Mounting Holes

The DEF Series with threaded attachment holes in each rail is the most popular product.

Attaching Hole Size

Metric Thread
DEF28 SeriesM5
DEF43 SeriesM8

The 28 and 43 in the part number indicates the overall height of the assembly cross-section in millimeters. Basically the 43 series is the larger heavier duty version of the two sizes. It has a high load carrying capacity.

DEF Product Technical Data

Each telescopic assembly consists of three main structural pieces, two small rails on each side of the “I-beam” shaped intermediate element. The smaller rails for the DEF product have drilled and tapped holes spaced every 80 mm for easy attachment.

  • Ball Based Design, 4 Point Contact
  • Carbon Steel, Induction Hardened Raceways
  • Electrolytic Zinc Plated Surface, Matte Silver Color
  • Rail Hole Spacing every 80 mm (3.15 inches)
  • Universal Mounting (i.e., left or right side)
  • Fully Telescoping Assembly (i.e.,100%)
  • Typically used in pairs (one on each side)

Typical Lead-time is 7-9 weeks for small quantities

Download DEF Series Product Catalog

Size 28

Lubricant Requirements

Periodically applying a small amount of an NLGI #2 lithium-based grease with no solid additives such as MoS2 (molybdenum disulfide) along the rail ball track is recommended for quiet operation and long life.

Download DEF28 Series 3D Models

DEF Series Size 28 Telescopic Linear Guides

Available Options

SKUClosed LengthPrice 
DEF28-0130-148130 mmPrice on request
DEF28-0210-232210 mmPrice on request
DEF28-0290-296290 mmPrice on request
DEF28-0370-380370 mmPrice on request
DEF28-0450-464450 mmPrice on request
DEF28-0530-548530 mmPrice on request
DEF28-0610-633610 mmPrice on request
DEF28-0690-717690 mmPrice on request
DEF28-0770-801770 mmPrice on request
DEF28-0850-866850 mmPrice on request
DEF28-0930-950930 mmPrice on request
DEF28-1010-10341010 mmPrice on request
DEF28-1090-11181090 mmPrice on request
DEF28-1170-12021170 mmPrice on request

Size 43

Lubricant Requirements

Periodically applying a small amount of an NLGI #2 lithium-based grease with no solid additives such as MoS2 (molybdenum disulfide) along the rail ball track is recommended for quiet operation and long life.

Download DEF43 Series 3D Models

DEF Series Size 43 Telescopic Linear Guides

Available Options

SKUClosed LengthPrice 
DEF43-210-246210 mmPrice on request
DEF43-290-316290 mmPrice on request
DEF43-370-416370 mmPrice on request
DEF43-450-484450 mmPrice on request
DEF43-530-556530 mmPrice on request
DEF43-610-626610 mmPrice on request
DEF43-690-726690 mmPrice on request
DEF43-770-796770 mmPrice on request
DEF43-850-866850 mmPrice on request
DEF43-930-966930 mmPrice on request
DEF43-1010-10361010 mmPrice on request
DEF43-1090-11061090 mmPrice on request
DEF43-1170-12061170 mmPrice on request
DEF43-1250-12761250 mmPrice on request
DEF43-1330-13761330 mmPrice on request
DEF43-1410-14461410 mmPrice on request
DEF43-1490-15161490 mmPrice on request
DEF43-1570-15861570 mmPrice on request
DEF43-1650-16861650 mmPrice on request
DEF43-1730-17561730 mmPrice on request
DEF43-1810-18561810 mmPrice on request
DEF43-1890-19261890 mmPrice on request
DEF43-1970-20261970 mmPrice on request

Other Configurations

There are three versions available: DSS, DSB, and DSD. The DSS version that is a conventional single stroke system. The DSD version is a bidirectional or double stroke system. DSB version incorporates a locking system for the closed or retracted position.

The DEF Series Telescopic Linear Guides is also available in our Online Store