High Temp Bearings, Inc.

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Instruction Manual for Sleeve Bearings HT750/HT1000/NT600

Introduction:

HT750/1000 or NT600 sleeve bearings do not require lubrication. This type of bearing relies on the material of the bearing to provide an effective dry lubrication between the shaft material and the bearing sleeve. No oil or grease should be used on the shaft or bearing, this may cause gumming of the shaft to the bearing.

To maximize bearing life, the shaft should be free of burrs, have minimum eccentricity, and have a shaft hardness of 35C Rockwell or higher.

Shaft collars may be used for slight amounts of thrust load. Tight clearance (.010 to .020) between bearing and collar should be maintained.

All bearings are self aligning within 2-3 degrees.

Shafting:
For extended bearing life, the recommendations shaft conditions are as follows:

Free of burrs and other positive defects
Hardened to 35 Rockwell "C" or higher
Surface roughness should be 10 to 20 micro-inches (.25 to .50 micro-meters)
Tolerance should be +.000/-.002" (+.000/-.051 millimeters)
Corrosion resistant shafting

Oxidation or contamination on the shafting may eliminate shaft to bearing clearance restricting movement of the shaft. Carbon-Graphite HT750 or HT1000 bearings can seize under these conditions. NT600 Composite bearings have been engineered to manage high levels of contamination and corrosion in the bearing area, and are highly resistant to shaft seizure.

Installation:
Take the mounted unit (Pillow Block, Flange Block) and slide onto the shaft. (For high temperature applications, proper shaft to bearing clearance is necessary. If extremely high temperatures or non-standard shaft materials are expected, proper allowance should be made in the shaft to accommodate expansion. Check your shaft dimensions to ensure clearance at the application temperatures.

Position and align the mounted unit on the shaft and tighten down the housing with the required bolts. Use shims if necessary.

Warning: Do not attempt to completely restrict axial expansion of the shaft, this will cause equipment damage.
Bore dimensions:

Bore dimensions are listed on the product tables. All bores are over nominal shaft sizes.

Special Applications:s

Please contact High Temp Bearings, Inc. for your projects special requirements:

Custom bores
Standard housings in stainless, ductile or wrought alloys,
Custom or alternative housings
Extreme Temperature
High loads
Chemically aggressive conditions