TF - 625 TYPE

TF-625 . TF-625S

The TF code identifies a family of self-lubricating bearings and washers made by a composite multilayer material. The main parts composing this product are a modified filled PTFE layer (lead free, in accordance to the European Parliament “ELV” directive 2000/53/EC) for the sliding self-lubricating surface, and a special primer used to allow the sintering of the PTFE layer to various types of baking metal layers like: carbon steel, bronze, stainless steel and Inconel 625. Thanks to its structure, the TF type provides an excellent match between the mechanical strength of the steel and the low coefficient of friction of the modified PTFE sliding layer.
This is a product that can be used in applications with medium loads and in a clean environment with low levels of abrasive elements such as metal powders. It can also be used with special mineral oils and specific greases such as silicone compounds or lithium soap.

TF-625 – SUPPORTING SHELL:
INCONEL 625

C

0.10%

Co

1.00%

Mn

0.05%

Mo

8 ÷ 10%

Cr

20 ÷ 23%

Ni

Rest

Ta + Tb

3.15 ÷ 4.15%

TF-625 – BEARING SECTION

Bearing for Valves - SLIB Italy - Sliding bearings for high pressure and ball bearings.

TF-625 – GRAPHIC LOAD/SPEED

Bearing for Valves - SLIB Italy - Sliding bearings for high pressure and ball bearings.

TF-625S – SUPPORTING SHELL: AISI 316L

C

0.10%

Co

1.00%

Mn

0.05%

Mo

8 ÷ 10%

Cr

20 ÷ 23%

Ni

Rest

Ta + Tb

3.15 ÷ 4.15%

TF-625S – BEARING SECTION

Bearing for Valves - SLIB Italy - Sliding bearings for high pressure and ball bearings.

TF-625S – GRAPHIC LOAD/SPEED

Bearing for Valves - SLIB Italy - Sliding bearings for high pressure and ball bearings.

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

All our TF types can be produced also as PLUS model, which is an enhanced type of lubrication treatment to reduce even more the coefficient of friction.

 

TF-C

TF-316

TF-316S

TF-625

TF-625S

TF-F51

Carbon Steel S235 JR
+Sintering
+ Filled PTFE film

Aisi 316L
+ Sintering
+ Filled PTFE film

Aisi 316L
+Sintering*
+ Filed PTFE

modified film

Carbon steel S235 JR
+ Sintering
+ Filled PTFE film

Carbon steel S235 JR
+ Sintering *
+ Filed PTFE
modified film

Duplex A182 F51
+ Sintering
+ Filled PTFE film

FASTRACK SERVICEXXXX
SUPPORTING SHELL

C 0.17%,
S 0.045%
Mn 1.40%
N 0.009%
P 0.045%

C 0.03%
Mn 1.80%
0.025%
Cr 16.70%
P 0.03%
Ni 10.00%
Si 0.50%
Mo 2.00%

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% max
Mn 0.05%
Ta + Nb 3.15 ÷ 4.15%
Cr 20 ÷ 23%
Ni Rest
Mo 8 ÷ 10%

C 0.10%
Co 1.00% max
Mn 0.05%
Ta + Nb 3.15 ÷ 4.15%
Cr 20 ÷ 23%
Ni Rest
Mo 8 ÷ 10%

C 0.20%
Cr 22.70%
S <0.15%
Ni 5.60%
P 0.025%
Mo 3.20%
Si 0.50%
N 0.16%
Mn 1.40%

The given values are nominal values from literature.
SLIDING LAYERS

Filled PTFE film, colour black-gray, thickness 200–220 μm,
heavy load capacity and self-lubricating under dry operation, lead free and non-coated.

SINTERING

Oven made sintering process between PTFE and the steel backing at a temperature of +250° C – BRONZE FREE.
* Special adhesive between the modi ed lled PTFE lm and the backing steel, thickness 60 μm, valid just for TF-316S and TF-625S

SHAFTFor an optimal performance the shaftsurface finishing shall be between Ra 0.40 and 1.60 μm, depending on the different applications. Hardness 80 – 160 HB5.

Mechanical Properties

WORKING TEMPERATUREmin – 190 °C
max + 260 °C
min – 190 °C
max + 260 °C
min – 190 °C
max + 260 °C
min – 190 °C
max + 260 °C
min – 190 °C
max + 260 °C
min – 190 °C
max + 260 °C
COEFFICIENT OF FRICTION0.03-0.200.03-0.200.03-0.200.03-0.200.03-0.200.03-0.20
MAX. SPEED1.00 m/s1.00 m/s0.50 m/s1.00 m/s0.50 m/s1.00 m/s
MAX. STATIC LOAD250 N/mm2250 N/mm2250 N/mm2250 N/mm2250 N/mm2250 N/mm2
MAX. DYNAMIC LOAD
(max. speed)
140 N/mm2
(0.10 m/s)
140 N/mm2
(0.10 m/s)
180 N/mm2
(0.05 m/s)
140 N/mm2
(0.10 m/s)
180 N/mm2
(0.05 m/s)
140 N/mm2
(0.10 m/s)
MAX. DYNAMIC LOAD
(max. speed)
60 N/mm2
(1.00 m/s)
60 N/mm2
(1.00 m/s)
80 N/mm2
(0.50 m/s)
60 N/mm2
(1.00 m/s)
80 N/mm2
(0.50 m/s)
60 N/mm2
(1.00 m/s)

Chemical Resistance

HYDROCARBONSExcellentExcellentExcellentExcellentExcellentExcellent
HYDROCHLORIC ACID
(concentrate to 10%)
ExcellentExcellentExcellentExcellentExcellentExcellent
SULFURIC ACID
(concentrate to 10%)
ExcellentExcellentExcellentExcellentExcellentExcellent
METHANEExcellentExcellentExcellentExcellentExcellentExcellent
OXYGENExcellentExcellentExcellentExcellentExcellentExcellent
SODIUM
HYDROXIDE
ExcellentExcellentExcellentExcellentExcellentExcellent
LIQUID
NITROGEN
ExcellentExcellentExcellentExcellentExcellentExcellent
SOLVENTSGoodGoodGoodGoodGoodGood

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.