K.B Old - 7.5 Replacement RC Nitro Engine Parts

A selection of replacement parts for K.B. These parts are not original parts unless otherwise stated in the descriptions. Please check your choices thoroughly.

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Replacement Parts Price Quantity
Single Row Ball Bearings - 6.35x15.875x4.978 mm - Stainless Steel AISI 440C - Replaces -
BB 6.35-15.88-4.98
Bearing - Stainless Bearing Shielded Option

Replacement Part: SR4-ZZ-MC3 (Each)
Double shielded standard stainless steel bearing

Single Row Ball Bearings - 6.35x15.875x4.978 mm Unflanged - Stainless Steel AISI 440C Bearing

$4.23
40 Available Now -> Orders for more than 40 can be expected around Jun 18, 2026
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Single Row Ball Bearings - 6.35x15.875x4.978 mm - Stainless Steel AISI 440C - Replaces -
BB 6.35-15.88-4.98
Bearing - Stainless Bearing Sealed Option

Replacement Part: SR4-2RS-MC3 (Each)
Double black rubber sealed standard stainless steel bearing

Single Row Ball Bearings - 6.35x15.875x4.978 mm Unflanged - Stainless Steel AISI 440C Bearing

$4.14
65 Available Now -> Orders for more than 65 can be expected around Jun 18, 2026
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Single Row Ball Bearings - 6.35x15.875x4.978 mm - Chrome Steel SAE 52100 - Replaces -
BB 6.35-15.88-4.98
Bearing - Standard Bearing Shielded Option

Replacement Part: R4-ZZ-MC3 (Each)
Double shielded standard bearing

Single Row Ball Bearings - 6.35x15.875x4.978 mm Unflanged - Chrome Steel SAE 52100 Bearing

$3.95
165 Available Now -> Orders for more than 165 can be expected around Jun 18, 2026
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Single Row Ball Bearings - 12.7x28.575x6.35 mm - Stainless Steel AISI 440C - Replaces -
BB 12.70-28.58-6.35
Replacement Bearing - High Precision Bearing

Replacement Part: SR8-MC34-U3-AF12 (Each)
Deleted Item. Available while stocks last. Open bearing with Abec 3 precision and light oil lubrication

Single Row Ball Bearings - 12.7x28.575x6.35 mm Unflanged - Stainless Steel AISI 440C Bearing

$22.00 $41.80
5 Available Now -> Only the available quantity may be ordered online. No backorders.
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Single Row Ball Bearings - 12.7x28.575x6.35 mm - Chrome Steel SAE 52100 - High Speed Polyamide Cage - Replaces -
BB 12.70-28.58-6.35
Replacement Bearing - High Speed Bearing - Polyamide Retainer

Replacement Part: R8-C3-T9H (Each)
Deleted Item. Available while stocks last.

Single Row Ball Bearings - 12.7x28.575x6.35 mm Unflanged - Chrome Steel SAE 52100 - High Speed Polyamide Cage Bearing

$16.00 $19.20
124 Available Now -> Only the available quantity may be ordered online. No backorders.
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Single Row Ball Bearings - 12.7x28.575x6.35 mm - Chrome Steel SAE 52100 - Replaces -
BB 12.70-28.58-6.35
Replacement Bearing - Standard Bearing

Replacement Part: R8-AF12 (PK-2)
Deleted Item. Available while stocks last.

Single Row Ball Bearings - 12.7x28.575x6.35 mm Unflanged - Chrome Steel SAE 52100 Bearing

$3.00 $9.18
2 (4 pcs) Available Now -> Only the available quantity may be ordered online. No backorders.
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