Alchemy Custom Lead Castings and Extrusions
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White Metal Bearing Alloys (Babbitt Metal) - Lead and Tin Based


 
Bar Shape Ingot Margash Pig
Dimensions 10-3/4" x 2" x 1-1/4"
(L x W x H)
26" x 2" x 1-1/2"
(L x W x H)
17-1/2" x 4" x 3-1/2"
(L x W x H)
Pure Lead 10 LB 25 LB 55 LB
Pure Tin 6-1/2 LB 16 LB 35 LB

Tin Based Alloys

Lead Based Alloys

   
Marine 11D SNSB5CU4
No. 1 (ASTM #1) SNSB4.5CU4.5
Marine 11R SNSB7.75CU2.75
Nickel Genuine (ASTM #2) SNSB7.5CU3.5
Marine 11 SNSB5.75CU5.25
Diesel Special SNSB6.75CU5.5
No. 11 (ASTM #11) SNSB6.75CU5.75
SAE 11 SNSB7.5CU6.5
Imperial Genuine SNSB7CU7
Turbine SNSB7CU8
Royal Amature SNSB8.25CU8
Super Tough (ASTM #3) SNSB8CU8
No. 13 (ASTM #13) PBSN6SB10
Mill Anchor PBSN5SB12
Durite (ASTM #15) PBSN1SB16
Star PBN5.25SB14
Silvertone PBSN2SB18
Royal (ASTM #8) PBSN5SB15
Heavy Pressure (ASTM #7) PBSN10SB15
Special Sawguide PBSN10SB19
 

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

 
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:
 

A. Continuity of service D. Lubrication
B. Bonding possibilities E. Cleanliness
C. Cooling facilities F. 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

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