Trailer Axle Bearing & Spindle Hardware Kit
10K Lippert Trailer Bearing Kit with Spindle End Hardware & 4" Oil Cap
Complete single wheel-end service kit for compatible 10K oil-bath trailer axle applications using the listed bearing, race, seal, oil cap, washer, spindle nut, and cotter pin components.
Part Number: BK4-287-LIPPERT+183772CAP 25580 / 387A Bearing Set One Wheel-End Kit
Key Measurements & Specs
| Specification |
Detail |
| Part Number / SKU |
BK4-287-LIPPERT+183772CAP |
| Product Type |
Bearing, race, oil seal, oil cap, and spindle-end hardware kit |
| Bearing Set |
25580 inner bearing and 387A bearing with matching 25520 and 382A races |
| Oil Seal |
7700081 oil seal, 2.875" ID x 3.88" OD |
| Oil Cap |
183772 threaded oil cap for compatible 4" thread applications; oil plug and O-ring included |
| Quantity Included |
One complete wheel-end kit; quantity one of each listed component |
Fitment / Application
| Category |
Details |
| Trailer System |
Heavy-duty oil-bath trailer axle wheel-end service |
| Primary Application |
Compatible 10K Lippert-style applications where the listed bearing, race, seal, oil cap, and spindle hardware match |
| Oil Cap Application |
183772 oil cap is commonly used on compatible Lippert 10K–16K axle applications with 4" threaded caps |
| Seal Reference |
7700081 / 10-51 style oil seal commonly referenced for Dexter 10K GD-style applications; verify by measurement |
| Fitment Method |
Match bearing numbers, race numbers, seal dimensions, spindle nut thread, washer size, cotter pin size, and oil cap thread before ordering |
Top Features
| Feature |
Buyer Benefit |
| Wheel-End Service Bundle |
Includes the core bearing, race, seal, cap, and spindle-end pieces needed for one compatible hub side |
| Matched Bearing & Race Numbers |
25580 pairs with 25520, and 387A pairs with 382A for clear pre-order verification |
| Oil-Bath Hardware Included |
Includes 183772 oil cap with plug and O-ring for compatible 4" threaded oil cap applications |
| Spindle Retention Hardware |
Includes washer, 1-1/2"-12 spindle nut, and cotter pin for compatible spindle-end service |
Overview
This 10K Lippert bearing kit is built as a convenient single wheel-end service package for compatible heavy-duty oil-bath trailer axle applications. The kit includes one 25580 bearing, one 25520 race, one 387A bearing, one 382A race, one 7700081 oil seal, one 183772 oil cap with plug and O-ring, one 181895 round spindle washer, one 006-239-00 spindle nut, and one 181899 cotter pin.
R&P Service Insight
Heavy-duty trailer hubs must be verified by component numbers and measurements. Do not rely on axle capacity alone when ordering bearings, races, seals, or spindle-end hardware.
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Check the bearing cones: Confirm 25580 and 387A are the bearing numbers currently used in your hub.
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Check the races: Confirm the hub uses 25520 and 382A races before installation.
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Check the oil cap: Confirm your hub accepts a 4" threaded oil cap before ordering.
R&P Knowledge Hub
Compatibility: This kit is intended for compatible 10K Lippert-style oil-bath wheel-end applications where all listed component numbers and measurements match.
Vehicle / System Fit: Heavy-duty trailer axle hub service using 25580 / 387A bearing combinations, 25520 / 382A races, 7700081 oil seal, and 4" threaded oil cap setup.
Installation Notes: Replace bearings, races, seals, and retention hardware using proper hub service procedures. Always inspect the spindle, hub bore, oil cap threads, seal surface, and bearing journals before reassembly.
Performance Insight: Oil-bath hub service depends on correct component fit. An incorrect seal, race, cap, or spindle nut can cause leakage, poor retention, or premature wheel-end failure.
Brand & Fitment Note
Selling Brand: R&P Carriages curated service kit using the listed bearing, race, seal, oil cap, and spindle-end hardware part numbers.
Application Reference: Lippert, Dexter, AL-KO, and Hayes references are used only to describe compatible trailer axle applications where the listed measurements and part numbers match.
What This Means: This listing is for a complete R&P Carriages wheel-end service kit, not a guaranteed single-manufacturer OEM kit unless specifically stated on the individual component packaging.
Before Ordering: Verify bearing numbers, race numbers, seal dimensions, spindle washer size, spindle nut thread, cotter pin size, oil cap thread, and hub style before installation.
R&P Repair Insight
Bearing kits are easiest to confirm before teardown by reading the stamped bearing and race numbers. If the trailer is down for service, compare every removed component to the kit before packing, seating, or sealing the hub.
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Seal Check: Confirm the oil seal measures 2.875" ID x 3.88" OD and matches your hub and spindle sealing surface.
-
Nut Check: Confirm the spindle uses a 1-1/2"-12 UNF-2B style 6-slot nut before installation.
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Cap Check: Confirm the oil cap is a threaded 4" application and that the plug and O-ring are installed correctly.
Features
Complete Single-Side Kit
Includes one full set of listed bearing, race, seal, oil cap, washer, spindle nut, and cotter pin components for one compatible wheel end.
10K Oil-Bath Application Focus
Built for compatible heavy-duty oil-bath trailer hub applications using the listed 10K-style bearing and seal combination.
4" Threaded Oil Cap Included
Includes the 183772 oil cap used in compatible 4" threaded Lippert-style oil-bath axle applications, with plug and O-ring included.
Spindle-End Hardware Included
Includes the 181895 round spindle washer, 006-239-00 6-slot spindle nut, and 181899 cotter pin for compatible spindle-end retention service.
Included Components
| Quantity |
Part Number |
Item |
Verified Detail |
| 1 |
25580 |
Bearing |
1.75" ID; fits 25520 race applications |
| 1 |
25520 |
Race |
3.265" OD; matches 25580 bearing |
| 1 |
387A |
Bearing |
2.25" ID; fits 382A race applications |
| 1 |
382A |
Race |
3.813" OD; matches 387A bearing |
| 1 |
7700081 |
Oil Seal |
2.875" ID x 3.88" OD; 10-51 style application reference |
| 1 |
183772 |
Oil Cap |
Threaded 4" oil cap for compatible Lippert 10K–16K applications; oil plug and O-ring included |
| 1 |
181895 |
Round Spindle Washer |
1-1/2" ID x 3" OD Lippert-style round spindle washer |
| 1 |
006-239-00 |
Spindle Nut |
AL-KO style 1-1/2"-12 UNF-2B 6-slot spindle nut; application reference for compatible AL-KO / Hayes 10K–16K axle setups |
| 1 |
181899 |
Cotter Pin |
1/4" diameter; 2-1/4" usable length / 2-3/4" overall length |
Important Fitment Note: Verify all bearing numbers, race numbers, seal dimensions, spindle nut thread, washer dimensions, cotter pin size, oil cap thread, hub style, and axle application before installation. Lippert, Dexter, AL-KO, and Hayes references describe application fitment only and do not guarantee universal compatibility.
10K Lippert bearing kit BK4-287-LIPPERT+183772CAP, 10K trailer axle bearing kit, 25580 bearing, 25520 race, 387A bearing, 382A race, 7700081 oil seal, 10-51 oil seal, 183772 oil cap, Lippert 10K 16K oil cap, 4 inch threaded oil cap, 181895 spindle washer, 006-239-00 spindle nut, 181899 cotter pin, oil bath trailer hub service kit, heavy duty trailer bearing kit, R&P Carriages trailer axle parts.
