ASTM-B23 4X Nickel Babbitt Ingot, Notch Bar, & Spool

DuraKapp™#4X Babbitt 5 lb Notch Bar
$190.00
Kapp Alloy's DuraKapp™ #4X Nickel Babbitt is built for higher temperature, high-speed applications including machinery, engine, and generator bearing refurbishment. With a composition of 88.8Sn/3.5Cu/7.5Sb/0.2Ni, these 6 lb notch bars deliver reliable performance where standard babbitts fall short. Backed by over 70 years of manufacturing experience, Kapp Alloy produces consistent, quality alloys trusted by bearing professionals across industries.
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DuraKapp™#4X Babbitt 1 lb. Regular Bar
$44.00
4X Nickel Babbitt for higher temperature high speed machinery, engine, and generator bearing refurbishment. 88.8Sn/3.5Cu/7.5Sb/0.2Ni, nominal 1 lb bars.
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DuraKapp™#4X Babbitt .125" (3.2mm) x 25 lb spool
$929.00
4X Nickel Babbitt for higher temperature high speed machinery, engine, and generator bearing refurbishment. 88.8Sn/3.5Cu/7.5Sb/0.2Ni, .125" (3.2mm) diameter on 25 lb spool.
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DuraKapp™#4X Babbitt 35 lb Ingot
$1,250.00
Kapp Alloy's DuraKapp™ #4X Nickel Babbitt is a tin-based alloy designed for higher temperature, high-speed machinery, engine, and generator bearing refurbishment. With a composition of 88.8Sn/3.5Cu/7.5Sb/0.2Ni, it delivers reliable performance in demanding applications. Available in nominal 35 lb ingots, this product has been manufactured by Kapp Alloy & Wire for over 70 years. Note that a minimum order quantity of 350 lbs applies.
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DuraKapp™#4X Babbitt .187" (4.8mm) x 25 lb spool
$922.00
4X Nickel Babbitt for higher temperature high speed machinery, engine, and generator bearing refurbishment. 88.8Sn/3.5Cu/7.5Sb/0.2Ni, .187" (4.8mm) diameter on 25 lb spool.
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DuraKapp™#4X Babbitt .125" (3.2mm) x 250 lb Payout Pak
$7,360.00
4X Nickel Babbitt for higher temperature high speed machinery, engine, and generator bearing refurbishment. 88.8Sn/3.5Cu/7.5Sb/0.2Ni, .125" (3.2mm) diameter in 250 lb POP.
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DuraKapp™#4X Babbitt .098" (2.5mm) x 250 lb Payout Pak
$7,560.00
4X Nickel Babbitt for higher temperature high speed machinery, engine, and generator bearing refurbishment. 88.8Sn/3.5Cu/7.5Sb/0.2Ni, .098" (2.5mm) diameter in 250 lb POP.
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DuraKapp™#4X Babbitt .098" (2.5mm) x 25 lb spool
$954.00
4X Nickel Babbitt for higher temperature high speed machinery, engine, and generator bearing refurbishment. 88.8Sn/3.5Cu/7.5Sb/0.2Ni, .098" (2.5mm) diameter on 25 lb spool.
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DuraKapp™#4X Babbitt .079" (2mm) x 250 lb Payout Pak
$7,685.00
4X Nickel Babbitt for higher temperature high speed machinery, engine, and generator bearing refurbishment. 88.8Sn/3.5Cu/7.5Sb/0.2Ni, .079" (2mm) diameter in 250 lb POP.
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DuraKapp™#4X Babbitt .079" (2mm) x 25 lb spool
$969.00
4X Nickel Babbitt for higher temperature high speed machinery, engine, and generator bearing refurbishment. 88.8Sn/3.5Cu/7.5Sb/0.2Ni, .079" (2mm) diameter on 25 lb spool.
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DuraKapp™#4X Babbitt .062" x 250 lb Payout Pak
$7,785.00
4X Nickel Babbitt for higher temperature high speed machinery, engine, and generator bearing refurbishment. 88.8Sn/3.5Cu/7.5Sb/0.2Ni, .062" (1.6mm) diameter x 250 lb. POP.
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DuraKapp™#4X Babbitt .062" x 25 lb spool
$982.00
4X Nickel Babbitt for higher temperature high speed machinery, engine, and generator bearing refurbishment. 88.8Sn/3.5Cu/7.5Sb/0.2Ni, .062" (1.6mm) diameter on 25 lb spool.
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ASTM-B23 4X Nickel Babbitt

DuraKapp™ #4X Nickel Babbitt is built for demanding bearing applications where standard alloys fall short. By adding Nickel to the #2 Babbitt matrix, it delivers higher tensile and compression strength at elevated temperatures without losing ductility—a balance that's critical to preventing bearing failure. Made from high-grade virgin raw materials using Kapp Alloy's Precision Microcasting™ process, it's a reliable choice for compressors, marine diesel engines, steel mills, mining machinery, paper mills, and crushers.

DuraKapp™#4X Nickel Babbitt lasts longer under severe service because it provides higher strength at higher temperatures without sacrificing ductility. In any bearing application, strength without this crucial ductility leads to bearing failure.

Nickel Babbitt Benefits & Features

Holds the oil film
Pours freely and fills all liner crevices
Anti-frictional
Cannot cut the shaft
Resists high temperatures
High thermal conductivity

Nickel Babbitt Applications

Compressors and blowers
Marine and locomotive diesel engines
Marine bearings
Reduction gears
Dredges
Lumber and cement mills
Rock and gravel machinery
Steel mills
Mining machinery
Sugar mills
Paper mills
Crushers
Electric railroads
Clay working machinery
Paired with KappaTinning™ Compound and Kapp CopperBond™ Flux

4X Nickel Babbitt Properties

Specification
ASTM B23:		None
Cross Reference:		4xxxx Nickel, Premier Nickel

Composition
Sn (Tin):		88.8%
Sb (Antimony):		7.5%
Cu (Copper):		3.5%
Ni (Nickel):		0.2%

Chemical Composition Limits	Minimum	Maximum
Sn (Tin):	88.0%	90.00%
Sb (Antimony):	7.00%	8.00%
Cu (Copper):	3.00%	4.00%
Pb (Lead):		<0.35%
Fe (Iron):		<0.08%
As (Arsenic):		<0.10%
Bi (Bismuth):		<0.08%
Zn (Zinc):		<0.005%
Al (Aluminum):		<0.005%
Cd (Cadmium):		<0.05%
Ni (Nickel):	0.10%	0.30%

Technical Data
Melting Temperature Range:		466-669°F (241-354°C)
Pouring Temperature:		795-805°F (424-429°C)
Density:		0.2667 lbs/in³
Specific Gravity:		7.39 g/cm³
Brinell Hardness:		24.5/12
Brinell Hardness @ 68°F (20°C):		27
Tensile Strength:		9,200 psi
Tensile Strength (Chill Cast):		15,200 psi (104.5 MPa)
Elongation on Break:		8%
Fatigue Strength:		6,460 psi (44.4 MPa)
Compressive Strength:		12,880 psi (6.44 tons/in²)
Yield Point, Compression at Temperature:		@ 68°F (20°C) = 8,240 psi (56.7 MPa); @ 212°F (100°C) = 3,800 psi (26.2 MPa)