Tri-layer maintenance-free bushing Description, Self-Lubricating Multilayer Composite Bushing Supplier, Composite Self-Lubricating Bushings
Tri-layer maintenance-free bushing has a base of lower carbon steel, onto which a porous bronze layer is sintered. PTFE mixtures are impregnated into the interstice of this bronze layer after the rolling process is completed. PTFE sleeve bushing has good physical & mechanical properties, also has certainly chemical properties. It is suitable for rotary, oscillating movement with the performance of self-lubricating. Anti-wear, lower friction, lower noise.
Superior friction performance under high load conditions.
The Steel backed series are self-lubricating bearings composed of three layers: Polytetrafluoroethylene plastic layers with fillers, sintered bronze layers, and back metals.
Self-Lubricating Multilayer Composite Bushing, switches from metal bearings are self-lubricating, which means you never need grease. Extend the life of your equipment by switching to composite bearings and bushings.
Design partners in reliable tribology, We offer surface engineering expertise to the world in motion for plain bushes and self-lubricating washers.
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Gasketing is offered in a wide range of materials, including a PTFE washer, compressed fiber washer, and Self-lubricating bronze graphite bearing, …
| PART NO. |
VENDOR’S CAT NO, |
ID JOURNAL |
OD +-.0005 HOUSING BORE |
L |
| 1 |
24DU16 |
1.4992 ±.0008 |
1.6563 |
1.000 ±.005 |
| 2 |
16DU16 |
.9985 +.0006 |
1.1251 |
1.000 +.005 |
| 3 |
20DU20 |
1.2480 +.0008 |
1.4063 |
1.250 +.010 |
| 4 |
20DU12 |
1.2480 ±.0008 |
1.4063 |
.750 ±.010 |
| 5 |
16DU08 |
.9985 ±.0006 |
1.1251 |
.510 ±.010 |
| 6 |
24DU16 |
1.4980 ±.0008 |
1.6563 |
1.000 ±.010 |
| 7 |
24DU24 |
1.4980 +.0008 |
1.6563 |
1.500 +.010 |
| 8 |
– |
1.4900 +.0008 |
1.6483 |
1.000 +.010 |
| 9 |
— |
1.4950 ±.0008 |
1.6533 |
1.500 ±.010 |
| 10 |
— |
.9985 ±.0006 |
1.1251 |
.980 ±.010 |
Du Bushing equivalent, gasket material
DU bushing inch standard size, gasket washer
| 16DU12 |
| 16DU16 |
| 18DU12 |
| 18DU16 |
| 20DU12 |
| 20DU16 |
| 20DU20 |
| 22DU16 |
| 22DU22 |
| 24DU16 |
| 24DU24 |
| 24DU32 |
| 26DU16 |
| 26DU24 |
| 28DU16 |
| 28DU28 |
| 28DU32 |
| 30DU16 |
| 30DU30 |
| 30DU36 |
| 32DU16 |
| 32DU32 |
| 32DU40 |
| 36DU32 |
| 36DU36 |
| 36DU48 |
| 40DU32 |
| 40DU48 |
| 44DU32 |
| 44DU48 |
| 48DU32 |
| 48DU48 |
| 48DU60 |
| 64DU48 |
| 64DU60 |
| 64DU76 |
Self-lubricating bushing
Carbon Steel + Copper Powder + (PTFE + Pb + Filler)
Steel backed with copper-plated steel with porous bronze sintered on the steel and polymers (PTFE+Pb) embedded into the bores of the bronze. By combining the metals and the polymers together, its products are endowed with a lower friction coefficient and good capacity of anti-abrasion and self-lubrication. Moreover, the steel back is plated with an erosion-prevention layer. Products of the PTFE composite series are widely applied in printing, weaving, and tobacco-producing machines, gymnastic equipment, etc.
| Performance Index |
Data |
| Max Load P |
Static Load |
250N/mm² |
| Max Load P |
Dynamic Load |
140N/mm² |
| Max Load P |
Oscillation Load |
60N/mm² |
| Linear Velocity V |
Dry Lubrication |
2.5m/s |
| Linear Velocity V |
Oil Lubrication |
>5m/s |
| Max PV value |
Grease Lubrication |
1.8N/mm²· m/s |
| Max PV value |
Oil Lubrication |
3.6N/mm²· m/s |
| Performance Index |
Data |
| Friction Coefficient μ |
Dry Lubrication |
0.08~0.20 |
| Friction Coefficient μ |
Oil Lubrication |
0.02~0.07 |
| Mating Axis |
Hardness |
>200 HB |
| Mating Axis |
Roughness |
Ra=0.4~1.25 |
| Working Temperature |
-200~+280℃ |
| Heat-conducting Coefficient |
40W/(m·k) |
| Heat-expansion Coefficient(Axial) |
11×10-6K-1 |
Feature
■ Serviceable without the need for lubrication. Thin and lightweight for compact design.
■ Demonstrates low coefficient of friction and superior load performance under high-load, low-speed conditions.
■ Usable at the PV values even in the middle- and high-speed zones when lubricated.
■ Usable in the wide temperature range from low to high temperatures. Has superior chemical resistance.
■ Features superior dimensional stability, mechanical strength, and thermal conductivity.
■ The 0.5 mm thin standard steel-backed bushing products are also available for space-saving.
Wear-resistant
Self-Lubricating Multilayer Composite Bushing is of excellent anti-abrasion performance, mainly due to the particular molecule structure of PTFE. The abrasion process can be generally divided into three phases, so there are kinds of friction coefficients. See the right graph:
1. “Running-in” phrase: PTFE compound on the bushing is transferred to its mating surface and forms a lubricating film. At this phase, the friction coefficient is bigger, thus the abrasion pace is very quick. See the curve shown in area I of the graph.
2. “Stabilization” abrasion phrase: After the “Running-in phase”, the friction happens between PTFE and PTFE, thus the friction coefficient is smaller and keeps steady. As a result, the wear rate is low and steady. See the curve shown in areaⅡof the graph.
3. “Sharp” abrasion phrase: As PTFE in the porous layer is slowly consumed up, not enough lubricant can be supplied to the gliding media. The friction coefficient and wear rate will rapidly rise. When 70% of the bronze surface is exposed, the service life of Self-Lubricating Multilayer Composite Bushing closes to its end. See the curve shown in area Ⅲof the graph.
Life Factors
1). PV Value
PV value is an effective criterion to calculate the service life of Self-Lubricating Multilayer Composite Bushing. If there is a need to prolong the service Life, PV value must be reduced.2). Ambient Temperature
The higher the working temperature is, the shorter the life of the products would be.3). Quality of the Mating Surface
Service life Self-Lubricating Multilayer Composite Bushing can be obviously prolonged if its mating axis is made by alloy steel or is plated by hard chrome and with surface Roughness Ra=0.4~0.63.
