Self-lubricating sintered bronze bearings

As standard, self-lubricating sintered bearings are impregnated with oil to achieve the self-lubricating effect. However, lubricant additives such as graphite and MoS2 may also be used. THN has a range of bronze and iron sintered bearings and many years of experience in standard and customer-specific bearing solutions.

THN has a wide standard range in various tolerances (including E7/r7, G7/s7 and F7/s7). The standard stock range contains more than 800 cylindrical bearings, 400 collar bearings and 110 hollow and solid rod sizes. In addition to our standard range, we also deliver many articles according to customer specifications and drawings. The customer-specific articles are bearings with deviating tolerances, special notches, spherical (self-adjusting) bearings and other shapes.

The most important properties of self-lubricating sintered bronze bearings are:

Very precise dimensions
Low-noise running
High reliability
No oil leaks
No additional lubrication required
Low maintenance costs

The suitability of self-lubricating sintered bearings is as follows:

Conditions	Sinter bronze	Sinter iron	Graphite bronze
Dry	Good	Good	Good
Oil	Good	Good	Not suitable
Grease	Reasonable	Reasonable	Not suitable
Water	Not suitable	Not suitable	Good
Process fluid	Not suitable	Not suitable	Not suitable

Technical data

Permitted loads for the sintered bearings are as follows:

Mechanical value	Sinter bronze	Sinter iron	Graphite bronze
PV (N/mm²·m/s) continuous	1,8	1,6	0,4
P max. (N/mm²) continuous	10	9,5	2,5
P max. (N/mm²) static	50	50	40
V max. (m/s) continuous	6	6	0,25
Maximum temperature	+ 90°C	+ 90°C	+ 300°C
Minimum temperature	- 20°C	- 20°C	- 40°C

The standard tolerances in the range carried by THN are:

Manufacturing tolerance (d/D)	Type	Bearing housing	Arbor press	Final tolerance	Shaft
E7/r7	SBC SBK (d<45)	H7	s5	F7	h8
E8/r8	SBK (d>=45)	H7	s5	F7	h8
G7/s7	SBC	H7	s5	H7	f7
G8/s8	SBK	H8	s5	H8	f7
F7/s7	SBC	H7	m6	H7	f7
F8/s8	SBK	H8	m6	H8	f7

* Type: SBC = Cylindrical bearings, SBK = Collar bearing
* d/D: d = shaft diameter, D = outside diameter