2.75" (CF38) Flanges

The BLT27C has cantilevered flange supports with wraparound flange brackets (see drawing). A total of six locking screws (three for each flange) hold the flanges within the brackets.

BLT27C Translator

The advantage of this design is that these screws can be loosened, even while the translator is installed, and the actuator portion of the translator can be repositioned radially around the flange. This allows positioning of the BLT to clear things like ion guns and other equipment. Another feature of this translator is that the guide rods and actuation screw are set back from the flange to give maximum access to the flange bolts.

Despite its modest price, the BLT27C will provide years of trouble-free service, especially if simple maintenance is performed. All BLT ball bearings are lubricated with high temperature grease for low friction and long life. All parts are field replaceable. All translators are also available with long strokes, motor drives, linear encoders, tapped flanges and special heights.


The BLT27C needs only minimal maintenance. The linear bearings used in Model BLT27C are self-lubricating and the guide rods need only be kept clean and free from dirt, dust and debris. The jacking screw and bearing do, however, need periodic lubrication. As delivered, the lead screw and ball bearings are coated with high temperature lubricant. This coating will degrade over time, due to moisture in the atmosphere. After bakeout, lightly re-lubricate the screws with the (provided) grease. Be especially careful not to use a hydrocarbon grease such as Felpro C100TM unless you periodically clean the oxidized residue from all load-bearing surfaces. The normal bakeout temperature is 150°C but higher temperatures can be used, if needed. For bakeouts between 150°C and 210°C, increase the frequency and thoroughness of lubrication.

To re-lubricate the bearings while the translator is under vacuum:

BLT27C Price List

Model Stroke Clear I.D. Compressed Price*
BLT27C-2 2" (50) 1.50" (38) 2.6" (66) $1580
BLT27C-3 3" (75) 1.50" (38) 2.75" (70) $1655
BLT27C-4 4" (100) 1.50" (38) 2.9 " (74) $1776
BLT27C-6 6" (150) 1.50" (38) 3.20 " (81) $2175
BLT27C-8 8" (200) 1.50" (38) 3.5 " (89) $2725
Dimensions are in inches (mm) - and - *Prices are in U.S. Dollars
Tapped flange (1/4-28 or M6 X 1), for each add: $15
Scale (see photo above), add $90
Add $150 for 1" (25 mm) travel dial indicator