ENGINEERING DATA

Tolerances for Plastic Race Radial Ball Bearings | Tolerance for 316 Stainless Race Ball Bearings
Corrosion Resistance for 316 Stainless | Chemical Compatibility
PBT Properties | Temperature Range for Plastics | Application Review Questionaire

Tolerances for Mounting & Interference Fits
For Plastic Race Radial Ball Bearings

TOLERANCES
BORE
MINIMUM MAXIMUM GENERAL
TOLERANCE
0.000" 0.750" +.003", -.0"
0.751" 1.250" +.004", -.0"
WIDTH
MAXIMUM
DIAMETER
GENERAL TOLERANCE
3.000" +/- .005"
4.000" +/- .008"
5.000" +/- .010"
 

OUTSIDE DIAMETER

MINIMUM MAXIMUM GENERAL
TOLERANCE
0.000" 1.000" +.0", -.003"
1.001" 1.625" +.0", -.004"
1.626" 2.000" +.0", -.005"
2.001" 3.000" +.0", -.006"

DIAMETRIC CLEARANCE "radial play"

BORE
(Maximum)
OUTSIDE
DIAMETER
(Maximum)
GENERAL
TOLERANCE
0.187" 1.000" free turning to .008"
0.500" 1.625" free turning to .009"
0.750" 2.000" free turning to .010"
1.250" 3.000" free turning to .012"
 
MOUNTING PRACTICE

PLASTIC RING CHARACTERISTICS
Plastic will expand and contract in proportion to the amount of interference pressure. Any press fit to the rings will reduce the diametric clearance in proportion to the amount of the interference fit. The maximum amount for overall interference fit for general practice should not exceed 1/2 of the nominal radial play dimension.

INTERFERENCE FITS
A typical application would be a press fit to one ring and a slip fit to the other. Using the above criteria, a bearing with .008" radial play would allow you to apply a maximum of .003" press fit to one ring and maximum of .001" slip fit the other. It is recommended that the customer measure the actual bearing to be used for calculating shaft and housing fits.

NOTE:These are general manufacturing tolerances. They may vary depending on material type and bearing design. For diameters larger than listed please contact KMS for engineering data and availability.


For 316 Stainless Race Ball Bearings

TOLERANCES

BORE
MINIMUM MAXIMUM GENERAL
TOLERANCE
0.000" 1.250" +.003", -.0"
WIDTH
MAXIMUM
DIAMETER
GERNERAL TOLERANCE
2.500" +/- .005"
 
OUTSIDE DIAMETER
MINIMUM MAXIMUM GENERAL
TOLERANCE
0.000" 2.500" +.0", -.003"
DIAMETRIC CLEARANCE
"radial play"
BORE
(Maximum)
OUTSIDE
DIAMETER
(Maximum)
GENERAL
TOLERANCE
0.250" 1.000" free turning to .007"
0.500" 2.000" free turning to .008"
0.750" 2.500" free turning to .010"

MOUNTING PRACTICE

316 STAINLESS RING CHARACTERISTICS
AISI 316 stainless steel is a non harden-able food and medical grade stainless. KMS 316 stainless raceways are semi-precision, unground type.  Due to the tolerance range of a semi-precision bearing ring, it is recommended that the customer measure the actual bearing to be used for calculating shaft and housing fits.

INTERFERENCE FITS
A typical application would be a press fit to one ring and a slip fit to the other. The maximum press fit would be .001 and a slip fit would be maximum of a line to line fit to the actual dimension. For example, using the above criteria, a bearing with a 1/2" bore and a outside diameter of 1-3/8" would have a bore tolerance of +.003, -.0 and an outside diameter tolerance of +.0, -.003. The actual dimension of the inner ring is .501 and the outer ring is 1.374. To achieve a slip fit on the inner ring the shaft would have to be .501 to .502 and a press fit to the outer ring would require the housing to be 1.373 to 1.374.

Note: These are general manufacturing tolerances, They may vary depending on bearing design.

Information presented is believed to be accurate at the time of publication but is subject to change without notice.


Corrosion Resistance For 316 Stainless

  MATERIALS 316 STAINLESS 440C STAINLESS* CHROME STEEL*
WATER Stream A B --
Domestic Water A B D
Sea Water A -- D
FOOD Food Products A B --
Fruit & Veg. Juices A B --
Dairy Products A C --
LIQUOR Hot Sulfite B -- --
Dye D D --
DILUTE ACIDS HCL -- -- --
H2SO4 B -- --
HNO2 A A --
Phosphoric B -- --
ACIDS H2SO4 A -- --
HNO2 -- -- --
Phosphoric A -- --
  Industrial Atmospheres B B C
Salt Air A C C
Ammonia A C B
Alkaline Salts B B C
A = excellent, B = good, C = fair, D = poor, -- = Will not withstand conditions*Please note that KMS does not manufacture bearings made from either 440C or Chrome Steel. They are listed for comparison to 316 stainless only.
 
MATERIAL COMPOSITION*
316 STAINLESS
Carbon: Maximum of 0.080%
Manganese: Maximum of 2.00%
Phosphorus: Maximum of 0.045%
Sulfur: Maximum of 0.030%
Silicon: Maximum of 1.00%
Chromium: 16.00% to 18.00%

Nickel: 10.00% to 14.00%
Nitrogen: Maximum of 0.010%
Molybdenum: 2.00% to 3.00%

*ref per ASTM A276-89a
 
MATERIAL CONVERSION
  (AGENCY)
Material AISI Federal ASTM UNS AMS
316 Stainless Type 316 QQ-S-763E A276-89a S31603 5648G

Chemical Compatibility

  ACETAL
(POM)
POLYPRO-
PYLENE
KYNAR®
(PVDF)
VALOX®
(PBT)
NYLON PEEK® TORLON® VESPEL®  UHMW-
PE
ACIDS WEAK
73 degrees
A A A A A A A A A
ACIDS STRONG
73 degrees
U A A L U L L L L
                   
ALKALIES,
WEAK
73 degrees
A A A L A A L A A
ALKALIES,
STRONG
73 degrees
U A L A A A L A A
                   
HYDROCARBONS A A A L A A A A L
                   
KETONES A A U L A A A A A
                    
ETHERS A - A - A - A - A
                   
ESTERS A L A A A A A - A
                   
ALCOHOLS A A L L A - L - A

A = ACCEPTABLE
L = LIMITED
U = UNACCEPTABLE
- = NO RATING

This chart is for reference only, KMS recommends testing in actual chemical concentrations to be encountered.
Information presented is believed to be accurate at the time of publication but is subject to change without notice.

PBT Plastic Blocks
PROPERTIES OF PBT
Properties Unit Test Method  
Mechanical
Tensile strength at yield N/mm2 ASTM D 638 115
at break
N/mm2 ASTM D 638 -
Elongation at yield % ASTM D 638 3
at break
% ASTM D 638  
Tensile modulus N/mm2 ASTM D 638 8000
Flexural yield strength N/mm2 ASTM D 790 -
Flexural yield strength N/mm2 ASTM D 790 170
Flexural modulus N/mm2 ASTM D 790 7000
Notched impact strength Charpy K/m2 DIN 53453 12
Notched impact strength IZOD J/m ASTM D 256 100
Hardness,      
H358/10
N/mm2 DIN 53456 104
H358/60
N/mm2 DIN 53456 101
Rockwell
ASTM D 785 L102
Thermal
Oxygen index* % ASTM D 2863 19
Flame retardancy* UL stand 94 94HB
(1/6 mm thickness)      
Heat resistance: Vicat, method B °C ASTM D 1525 210-215
Thermal conductivity W/m2C ASTM C 177 0.19
Mould shrinkage flow % ASTM D 1299 0.4 - 0.6
Cross flow direction % ASTM D 1299 0.6 - 0.8
Physical
Water absorption ASTM D 570  
24 Hrs, 23°C %   0.06
 
CHEMICAL RESISTANCE OF PBT
Chemical Media °C Immulation % Days % Retention of strength
Acids
10% Hydrochloric 23 30 89
23 90 85
23 180 82
10% Sulfuric 23 30 97
23 90 94
23 180 90
35% Sulfuric (battery) 23 30 97
23 180 96
66 30 84
66 180 35
10% Acetic 23 30 89
23 180 88
Bases
5% Potassium Hydroxide 23 30 83
23 90 10
10% Sodium Hydroxide 23 30 2
23 180 -
10% Ammonium Hydroxide 23 30 90
23 90 87
23 180 58
Organic Solvents
Ethyl Alcohol 23 30 99
23 180 94
Methyl Alcohol 23 30 91
23 180 76
Isopropyl-Alcohol 23 30 100
23 180 100
Isopropyl-Alcohol & Water (50-50) 23 30 93
23 180 96
Turpentine 23 180 92
23 30 66
Acetone 23 180 63
23 30 90

Temperature Range for Plastics

Recommenced maximum service temperature in air for Plastic Raceways.

Materials
°F/°C
Polypropylene
140/60
Acetal
180/82
PBT Polyester
158/70
Peek
338/170
Minlon®
400/204
Nylon 612
181/83
Polysulfone
329/165
UHMW-PE
130/55
Torlon®
457/236
PVC
180/71
Kynar® (PVDF)
183/84

Minlon is registered trade mark of the Dupont Corporation.
Torlon is registered trade mark of the Amoco Corporation.
Kynar is a registered trade mark of the Autochem Corporation.

* This chart is for reference only. KMS recommends testing in actual environment to be encountered. Information presented is believed to be accurate at the time of publication and is subject to change without notice.

No warranty, neither expressed or implied is given regarding the accuracy of this information. The user assumes all risk and liability in connection with the use of KMS information.


Back to top
| Home

KMS Bearings, Inc.
1590 N. Lakeview Ave., Anaheim, California 92807 USA
Telephone (714) 970-0280, Fax (714) 970-0560

Toll Free (800) 448-2412
Email