PMT TYPE
PMT-316 . PMT-316 plus . PMT-625 . PMT-625 plus
This product identifies a new generation of Sliding bearings and washers for applications in low and high temperatures, thanks to a special coating realized with a system similar to the PVD process. This coating confers to the backing material an excellent resistance to extreme temperatures while maintaining a good coefficient of static friction even with a dynamic heavy load. The metal backing layers used for this product are the Aisi 316L and the Inconel 625. With this type of product, the shaft should not be heat treated.
Use of oil and grease with these bearings is not recommended.
PMT-316 . PMT-316plus – SUPPORTING SHELL: AISI 316L
C | 0.03% | Mn | 1.80% |
S | 0.25% | Cr | 16.70% |
P | 0.03% | Ni | 10.00% |
Si | 0.50% | Mo | 2.00% |
PMT-316 . PMT-316plus – BEARING SECTION
PMT-316 . PMT-316plus – GRAPHIC LOAD/SPEED
PMT-625 . PMT-625plus – SUPPORTING SHELL: INCONEL 625
C | 0.10% | Co | 1.00% |
Mn | 0.05% | Mo | 8÷10 % |
Cr | 20 ÷ 23 % | Ni | Rest |
Ta + Nb | 3.15 ÷ 4.15 % | ||
PMT-625 . PMT-625plus – BEARING SECTION
PMT-625 . PMT-625plus – GRAPHIC LOAD/SPEED
PS: the values shown in the graph were determined with a test of constant load, and running for 1000 cycles at three different temperatures: -190 °C, +18 °C and +260 °C
Dimensions
TABLE LEGEND:
SIZE:
Inside and outside bearing diameters
INSIDE Ø:
Tolerance range of the inside Ø after the assembly in the seat (mm)
HOUSING/SEAT Ø:
Housing/seat tolerance (mm)
BEARING THICKNESS:
Thickness tolerance of the finished bearing (mm)
CUT:
Maximum opening of the bearing flaps (carbon steel and other materials) (mm)
SHAFT Ø:
Correct size of the shaft to be used with the bearing
Comparison Table
PMT-316 | PMT-316 plus | PMT-625 | PMT-625plus | |
|---|---|---|---|---|
Aisi 316L | Aisi 316L | Inconel 625 | Inconel 625 | |
| FASTRACK SERVICE | X | X | ||
| SUPPORTING SHELL | C 0.03%, Mn 1.80% S 0.025%, Cr 16.70% P 0.03%, Ni 10.00% Si 0.50%, Mo 2.00% | C 0.03%, Mn 1.80% S 0.025%, Cr 16.70% P 0.03%, Ni 10.00% Si 0.50%, Mo 2.00% | C 0.10%, Co 1.00% Mn 0.05%, Ta + Nb 3.15 ÷ 4.15% Cr 20 ÷ 23%, Ni Rest Mo 8 ÷ 10 % | C 0.10%, Co 1.00% Mn 0.05%, Ta + Nb 3.15 ÷ 4.15% Cr 20 ÷ 23 %, Ni Rest Mo 8 ÷ 10 % |
| The given values are nominal values from literature. | ||||
| SLIDING LAYERS | Vaporization of the special coating. Multilayer deposit on the surface. Minimum hardness 180 HB, and minimum thickness 15 μm. | |||
| SHAFT | For an op mal performance the sha surface nishing shall be between Ra 0.40 and 1.60 μm, depending on the di erent applica ons. Hardness 100 – 160 HB5. | |||
Mechanical Properties
| WORKING TEMPERATURE | min – 198 °C max + 430 °C | min – 100 °C max + 500 °C | min – 198 °C max + 430 °C | min – 100 °C max + 600 °C |
| COEFFICIENT OF FRICTION | 0.06-0.12 | 0.08-0.20 | 0.06-0.12 | 0.08-0.20 |
| MAX. SPEED | 0.40 m/s | 0.40 m/s | 0.40 m/s | 0.40 m/s |
| MAX. STATIC LOAD | 200 N/mm2 | 200 N/mm2 | 200 N/mm2 | 200 N/mm2 |
MAX. DYNAMIC LOAD | 150 N/mm2 | 150 N/mm2 | 150 N/mm2 | 150 N/mm2 |
MAX. DYNAMIC LOAD | 100 N/mm2 | 100 N/mm2 | 100 N/mm2 | 100 N/mm2 |
Chemical Resistance
| HYDROCARBONS | Excellent | Excellent | Excellent | Excellent |
| HYDROCHLORIC ACID (concentrate to 10%) | Excellent | Excellent | Excellent | Excellent |
| SULFURIC ACID (concentrate to 10%) | Excellent | Excellent | Excellent | Excellent |
| METHANE | Excellent | Excellent | Excellent | Excellent |
| OXYGEN | Excellent | Excellent | Excellent | Excellent |
| SODIUM HYDROXIDE | Excellent | Excellent | Excellent | Excellent |
| LIQUID NITROGEN | Excellent | Excellent | Excellent | Excellent |
| SOLVENTS | Excellent | Excellent | Excellent | Excellent |
Note: The informaton in this data-sheet is to be considered reliable, but conditons and methods of use, which are beyond our control, may modify the results. The informaton and data contained in this data-sheet are the result of a long and detailed research, however F.lli Paris S.r.l. cannot be considered responsible for any incorrect or incomplete data. Owing to the constant development of the products, we reserve the right to make changes to them without prior notice.
