Toll Free:  1-877-420-3731
 (604) 420-3731, Fax (604) 420-9240
 Email

Home  |  About Us |  Industrial Products 
Anodes | Babbitt | Bricks, Blocks 
Pipe & Tube | Sheet Lead
 Reliance Sacrificial Anodes | Why Reliance

White Metal Bearing Alloys (Babbitt Metal)

In selecting the proper type of Babbitt for a particular job there are a number of factors to take into consideration, the most import of which are as follows:
  1. Surface speed of the SHAFT
  2. Load bearing is required to carry

Secondly, but no less important, the following points must also be taken into account:

  1. Continuity of service
  2. Bonding possibilities
  3. Cooling facilities
  4. Lubrication
  5. Cleanliness
  6. Attention given to the bearings in question

There is no doubt that if a bearing be highly loaded in relation to its size, a high tin alloy is desirable; whereas for much slower speed work and less heavily loaded bearings, a lead-base one may be employed, and is far more economical.

1. Surface speed of the shaft: (The number of feet traveled per minute by the shaft circumferentially.)
 
Pi = 3.1416

Formula:

 Pi x D x RPM = S D = Diameter of Shaft
12 RPM = Revolutions Per Minute
S = Surface speed of the Shaft

Example:

 Determine the surface of a 2 inch diameter shaft going 1,400 RPM
Pi x D x RPM

= 3.1416 x 2 x 1,400 = 733.04 Ft/min 
12 12
2. Load Bearing is required to carry:  (The weight which is being exerted through the combined weights of the shaft and any other direct weights on the shaft and measured in pounds per square inch.)
W = Total weight carried by bearing

    Formula:

___W___

 = L I.D = Inside diameter of bearing

I.D x L.O.B.

 L = Load bearing required to carry
L.O.B = Length of Bearing
   

    Example:

 Determine the load on a bearing of a 2 inch I.D bearing,
5 inches long and carrying a weight of 3,100 lbs

_____W_____

 = 3,100 = 310 Lbs/sq.in

I.D x L.O.B.

    2 x 5
There are many formulas for standard grade babbitts but they fall into two main classifications:

Babbitt Classification

 LIMITS
Surface Speeds
(# of Ft/min)		 LOAD
(Lbs/sq.in.)
MIN. MAX. MIN. MAX.
Tin-Based Babbitts 1,000 2,400 100 2,000
Lead Based Babbitts 100 1,000 100 500

Tin Based Alloys - Chemical Composition (%) Chart

INDUSTRY NAME ASTM B23 Sn
(Tin)		 Sb
(Antimony)		 Cu
(Copper)		 Pb
(Lead)
Marine 11 D - 90.0 - 92.0 4.5 - 5.5 3.5 - 4.5 0.35 (Max)
No. 1 Grade 1 90.0 - 92.0 4.0 - 5.0 4.0 - 5.0 0.35 (Max)
Marine 11R - 89.0 - 89.5 7.5 - 8.5 2.5 - 3.0 0.35 (Max)
Nickel Genuine Grade 2 88.0 - 90.0 7.0 - 8.0 3.0 - 4.0 0.35 (Max)
Marine 11 - 88.0 - 90.0 5.5 - 6.0 5.0 - 5.5 0.35 (Max)
4X Royal Nickel Genuine - 87.5 - 89.5 7.25 - 7.75 3.25 - 3.75 0.35 (Max)
Diesel Special - 87.5 - 88.0 6.5 - 7.0 5.0 - 6.0 0.35 (Max)
No. 11 Grade 11 86.0 - 89.0 6.0 - 7.5 5.0 - 6.5 0.35 (Max)
SAE 11 - 85.0 - 87.0 7.0 - 8.0 6.0 - 7.0 0.35 (Max)
Imperial Genuine - 85.0 - 87.0 6.5 - 7.5 6.5 - 7.5 0.35 (Max)
Turbine - 84.0 - 86.0 6.5 - 7.5 7.5 - 8.5 0.35 (Max)
Royal Armature - 83.5 - 84.0 8.0 - 8.5 7.5 - 8.5 0.35 (Max)
Super Tough Grade 3 83.0 - 85.0 7.5 - 8.5  7.5 - 8.5 0.35 (Max)


Maximum Allowable Impurities:      Fe=0.08, As=0.10, Bi=0.08, Zn=0.005, Al=0.005, Cd=0.05

Lead Based Alloys - Chemical Composition (%) Chart

INDUSTRY NAME ASTM B23 Sn
(Tin)		 Sb
(Antimony)		 Pb
(Lead)		 As
(Arsenic)
No. 13 Grade 13 5.5 - 6.5 9.5 - 10.5 Balance 0.25 (Max)
Mill Anchor - 4.0 - 6.0 11.5 - 12.5 Balance 0.25 (Max)
Durite Grade 15 0.8 - 1.2 14.5 - 17.5 Balance 0.8 - 1.4
Star - 5.0 - 5.5 13.5 - 14.5 Balance 0.30 - 0.60
Silverstone - 1.0 - 3.0 17.5 - 18.5 Balance 0.25 (Max)
Royal Grade 8 4.5 - 5.5 14.0 - 16.0 Balance 0.30 - 0.60
Heavy Pressure Grade 7 9.3 - 10.7 14.0 - 16.0 Balance 0.30 - 0.60
Special Sawguide - 9.0 - 11.0 18.5 - 19.5 Balance 0.25 (Max)


Maximum Allowable Impurities:     Cu=0.50, Fe=0.10, Bi=0.10, Zn=0.005, Al=0.005, Cd=0.05

 

 


© 2007 Metal Distributors, Ltd.  7220 Winston Street, Burnaby, BC, Canada V5A 2G9
All rights reserved.  Reliance is a trademark of Metal Distributors, Ltd.