Babbitt Classifications

There are many specific formulations for bearing Babbitt, each designed to meet the needs of specific bearings in use. However, Babbitt can be classified as either Tin-Based or Lead-Based according to the following table.


Babbitt Classification LIMITS
Surface Speeds (fpm) LOAD (psi)
MIN. MAX. MIN. MAX.
Tin-Based Babbitts 1,000 2,400 100 2,000
Lead-Based Babbitts 100 1,000 100 500
fpm = feet per minute, psi = pounds per square inch

Tin-Based Babbitt Alloys High Speed and High Pressure Bearings

As most modern equipment and engines operate at high speeds, Tin-Based Babbitt bearings are far more common. The chart below list names and ASTM formulations of common Tin-Based Babbitt alloys.

Tin-Based Babbitt Alloys

INDUSTRY NAMES ASTM B23 QQ-T-390A 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, DuraKapp™ #1 Grade 1 No. 1 90.0 - 92.0 4.0 - 5.0 4.0 - 5.0 0.35 (Max)
NF A 56-101 (Code 101) - - 89.0 - 91.0 5.75 7.25 2.75 4.25 0.35 (Max)
NF A 56-101 (Code 111) - - 89.0 - 91.0 5.75 7.25 2.75 4.25 0.10 (Max)
Marine 11R - - 89.0 - 89.5 7.5 - 8.5 2.5 - 3.0 0.35 (Max)
Nickel Genuine, DuraKapp™ #2 Grade 2 No. 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)
NF A 56-101 (Code 102) - - 87.0 - 89.0 6.75 8.25 2.75 4.25 0.35 (Max)
NF A 56-101 (Code 112) - - 87.0 - 89.0 6.75 8.25 2.75 4.25 0.10 (Max)
Grade 11, DuraKapp™ #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, DuraKapp™ #3 Grade 3 No. 3 83.0 - 85.0 7.5 - 8.5 7.5 - 8.5 0.35 (Max)
NF A 56-101 (Code 103) - - 82.0 - 84.0 10.25 11.75 5.25 6.75 0.35 (Max)
NF A 56-101 (Code 113) - - 82.0 - 84.0 10.25 11.75 5.25 6.75 0.10 (Max)
No. 4 - No. 4 80.5 - 82.5 12.0 - 14.0 5.0 - 6.0 0.35 (Max)
NF A 56-101 (Code 104) - - 79.0 - 81.0 9.25 10.75 9.25 10.75 0.35 (Max)
NF A 56-101 (Code 114) - - 79.0 - 81.0 9.25 10.75 9.25 10.75 0.10 (Max)
NF A 56-101 (Code 106) - - 79.0 - 81.0 11.25 12.75 5.00 7.00 1.5 2.5
NF A 56-101 (Code 105) - - 77.0 - 79.0 12.25 13.75 8.25 9.75 0.35 (Max)
NF A 56-101 (Code 115) - - 77.0 - 79.0 12.25 13.75 8.25 9.75 0.10 (Max)
Grade 4, DuraKapp™ #4 Grade 4 - 74.0 - 76.0 11.0 - 13.0 2.5 - 3.5 9.3 - 10.7
NF A 56-101 (Code 107) - - 73.0 - 75.0 6.00 8.00 3.00 5.00 3.00 5.00
No. 5 - No. 5 61.0 - 63.0 9.5 - 10.5 2.5 - 3.5 24.0 - 26.0
% Maximum Allowable Impurities: Fe (Iron)=0.08, As (Arsenic)=0.10, Bi (Bismuth)=0.08,
Zn (Zinc)=0.005, Al (Aluminum)=0.005, Cd Cadmium)=0.05

Lead-Based Babbitt Alloys Low Speed and Low Pressure Bearings

Lead-Based Babbitt bearings are encountered most often in the rebuild and restoration of antique engines, motors and compressors. The chart below lists the most common Lead-Based Babbitt formulations.

Lead-Based Babbitt Alloys

INDUSTRY NAME ASTM B23 QQ-T-390A Sn (Tin) Sb (Antimony) Pb (Lead) As (Arsenic)
Choker - - - 6.5 - 7.5 92.0 - 94.0 0.20
Durite, DuraKapp™ #15 Grade 15 No. 10 0.8 - 1.2 14.5 - 17.5 Balance 0.8 - 1.4
Hardware No. 4 - - 1.0 - 2.0 12.3 - 14.3 84.2 - 86.2 0.20
Silverstone - - 1.0 - 3.0 17.5 - 18.5 Balance 0.25 (Max)
No. 13 - No. 13 4.0 - 6.0 8.0 - 10.0 83.0 - 88.0 0.20
Mill Anchor - - 4.0 - 6.0 11.5 - 12.5 Balance 0.25 (Max)
Royal, DuraKapp™ #8 Grade 8 No. 6 4.5 - 5.5 14.0 - 16.0 Balance 0.30 - 0.60
Star - - 5.0 - 5.5 13.5 - 14.5 Balance 0.30 - 0.60
NF A 56-101 (Code 201) - - 5.0 - 7.0 14.0 16.0 77.0 79.0 (0.5-1.0 Cu)
Grade 13, DuraKapp™ #13 Grade 13 - 5.5 - 6.5 9.5 - 10.5 Balance 0.25 (Max)
NF A 56-101 (Code 202) - - 9.0 - 11.0 14.0 16.0 74.0 76.0 (0.5-1.0 Cu)
No. 11 - No. 11 9.0 - 11.0 11.5 - 13.5 74.0 - 79.0 0.20
Sawguide - - 9.0 - 11.0 18.5 - 19.5 Balance 0.25 (Max)
Heavy Pressure, DuraKapp™ #7 Grade 7 No. 7 9.3 - 10.7 14.0 - 16.0 Balance 0.30 - 0.60
% Maximum Allowable Impurities: Cu (Copper)=0.50, Fe (Iron)=0.10, Bi (Bismuth)=0.10,
Zn (Zinc)=0.005, Al (Aluminum)=0.005, Cd (Cadmium)=0.05

Babbitt Forms

DuraKapp™ #2 Babbitt

DuraKapp™ #2 Babbitt is available in 35 lb ingots, 6 lb notchbars, 1 lb bars, 18 sticks and as continuous spray wire on 25 lb spools, and in 250 lb payout packs.

Most other Babbitt formulas are available in ingot and bar forms only. They are too hard and/or too brittle to make in a wire form.

Additional Babbitting Products

KappaTinning™ Compound

KappaTinning™ Compound is a dry mixture of pure powdered Tin and flux specifically designed for pre-Tinning cast Iron, Steel, Bronze and Copper bearing shells. A one pound container of KappaTinning™ Compound contains about twice as much Tin and goes further than other tinning compounds currently on the market.read more

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