Best Trailer Hub And Spindle Kit for Common Axle Setups

#1 · Best Overall

1. RigsNParts #84 Idler Hub Kit

• Weight: 25.7 lb

Best for: 3500-pound axle repair pairs.

Why it ranks #1: Two 5-on-4.5-inch hubs and #84 spindles suit a 3,500-pound axle; the package also lists bearings, seals, spindle nuts, washers, and cotter pins.

Two complete hub-and-spindle sets pair a 5-on-4.5-inch idler hub with a #84 spindle for 3500-pound trailer axles. That matched pairing gives buyers the core components for servicing both sides, with the spindle rated at 1750 pounds per wheel and bearing sizes identified for fit checks.

Each set includes a 5-on-4.5-inch hub, #84 spindle, inner and outer bearings, plus spindle nut, washer, and cotter pin. Having the installation hardware and bearing cones in the package can simplify a paired axle repair. The spindle measures 8.25 inches overall and has a 1.75-inch largest diameter, while the listed application is 3500-pound trailer axles. Check those dimensions and the hub’s bolt pattern against the existing setup before installation.

Skip it if you need a 4-on-4 pattern; Thomletha’s four-set AMF8-035131AT kit uses that bolt layout.

For a trailer owner replacing both sides of a 3500-pound axle, this pair bundles hubs, #84 spindles, bearings, and basic retention hardware. The 5-on-4.5 pattern and stated spindle dimensions remain essential fit boundaries.

Listed on Amazon as: Trailer Idler Hub Kits with 5 on 4.5" Bolt Idler Hub & Round #84 Trailer Axle Spindle Fit for 3500 lbs Trailer Tdler Hub Kit,2 Sets

#2 · Complete Hardware Set

2. OZISENS 3500 lb Hub Kit

Best for: Paired 3500-pound axle kits.

Why it ranks #2: This two-set 3,500-pound kit specifies 5-on-4.5-inch hubs and tapered #84 spindles, with bearings and additional installation hardware listed.

Two 3500-pound hubs with a 5-on-4.5-inch bolt pattern arrive with #84 tapered spindles and associated hardware. This combination gives buyers a paired replacement package for a compatible axle, while the listed 1-1/16-inch to 1-3/8-inch spindle range and bearing sizes help establish the fit requirements.

The kit lists two hubs, two #84 tapered spindles, L68149 and L44649 bearings, seals, spindle nuts, washers, caps, and cotter pins. That broad hardware grouping can reduce separate sourcing during a two-side repair. Its 5-on-4.5-inch pattern suits trailers using that wheel layout, and the stated 3500-pound rating identifies the axle class. Confirm the tapered spindle dimensions and bearing interfaces against the existing assembly before starting work.

Skip it if you require a 5-on-5 hub; FKG’s GL4856E-2PCS kit is listed with that bolt circle.

This is a practical match for owners doing a paired service on a 3500-pound axle with a 5-on-4.5 wheel pattern. Its tapered spindle dimensions and specified bearing sizes are the key compatibility boundaries.

Listed on Amazon as: 2 Sets 3500 lbs 5 Bolt 4.5 Trailer Hub and #84 Spindle Kits

#3 · OE-Spec Construction

3. FKG 5-on-4.5 Hub Kit

• Weight: 33 lb
• Package Dimensions: 18.9 x 10.71 x 7.48 in

Best for: 5-on-4.5 tapered-axle pair.

Why it ranks #3: A set of two for 3,500-pound axles, it pairs a 5-on-4.5-inch hub with tapered spindles and has outer races installed.

FKG’s two-set kit combines a 5-on-4.5-inch hub bolt circle with tapered spindles for 3500-pound axles. That pairing serves buyers seeking a matched wheel pattern and axle class, while the stated 1-3/8-inch to 1-1/16-inch spindle range narrows the compatibility check.

Outer races are already installed in the hubs, which can remove that separate preparation step during installation. The two-set quantity supports a paired replacement, and the specified 5-on-4.5-inch circle identifies the wheel-side fit. FKG lists tapered spindles for 3500-pound axles, sized from 1-3/8 inches to 1-1/16 inches, and notes ISO/TS 16949 certification and OE-standard testing. Compare the spindle dimensions and hub pattern with the existing axle assembly.

Skip it if you need a 5-on-5 pattern; FKG’s GL4856E-2PCS kit matches that bolt circle.

This pair suits a buyer servicing a 3500-pound tapered-spindle axle with 5-on-4.5 wheels. Installed outer races simplify one installation step, but the listed spindle geometry remains a firm fit boundary.

Listed on Amazon as: FKG Trailer Hub Spindle Kit 5 Bolt on 4.5 Inch 5-4.5" Bolt Circle Hub Fit for 3,500 lb. axles with 1-3/8 Inch to 1-1/16 Inch Tapered Spindles, Set of 2

#4 · Four-Set Package

4. Thomletha BT8 Hub Kit

• Weight: 34.8 lb

Best for: Four-wheel 4-on-4 servicing.

Why it ranks #4: Four 4-on-4 hubs and BT8 spindles suit a 2,000-pound capacity setup; the listing gives an 8.75-inch spindle length and bearing details.

Four complete 4-on-4 hub and BT8 spindle sets make this Thomletha kit suited to buyers servicing multiple wheel positions at once. Each spindle is 8.75 inches long, and the listed load-bearing capacity is 2,000 pounds, giving shoppers concrete layout and capacity details to compare with their trailer.

The 4-on-4 bolt pattern and 1/2-inch-diameter, 1-5/16-inch-long studs define the wheel connection, while the 8.75-inch BT8 spindle helps identify the axle-side configuration. Black-coated hub surfaces and zinc-plated dust caps are specified for corrosion and rust resistance. Four sets include bearings, nuts, and rubber-plug dust covers, which can support a multi-position service job; verify the 2,000-pound capacity against the intended trailer application.

Skip it if you need a 5-on-4.5 hub; RigsNParts’ RN-5X45H-2K+RN-SP17584X2 kit uses that pattern.

A buyer servicing several compatible 4-on-4 positions can use the four-set quantity and included bearings and hardware. Its listed 2,000-pound capacity and BT8 spindle dimensions should guide the fit decision.

Listed on Amazon as: 4 Sets 4 on 4 Bolt Idler Hub and 1 Round BT8 Spindle

#5 · 5-on-5 Fit

5. FKG 5-on-5 Hub Kit

• Weight: 33.4 lb
• Package Dimensions: 18.66 x 9.96 x 7.32 in

Best for: 5-on-5 3500-pound axle pair.

Why it ranks #5: This two-piece set fits 3,500-pound axles with 5-on-5 hubs and tapered spindles; installed outer races are a useful package detail.

A 5-on-5-inch hub bolt circle sets the FKG kit apart for buyers with that wheel layout on a 3500-pound axle. The two-set package uses tapered spindles sized from 1-3/8 inches to 1-1/16 inches, giving shoppers specific pattern and spindle details for compatibility checks.

The kit includes two hubs and tapered spindles for 3500-pound axles, with outer races already installed in the hubs. That installation detail can save a separate race-installation step during assembly. The specified 5-on-5 bolt circle identifies the wheel-side match, while the 1-3/8-to-1-1/16-inch spindle dimensions describe the tapered axle interface. FKG also states ISO/TS 16949 certification and testing to OE standards; those claims do not replace checking dimensions against the existing setup.

Skip it if you have a 5-on-4.5 wheel pattern; FKG’s GL4856C2P kit uses that bolt circle.

For owners replacing a pair on a compatible 3500-pound axle with 5-on-5 wheels, this kit includes preinstalled outer races. Match the tapered spindle dimensions and bolt circle before choosing it.

Listed on Amazon as: FKG Trailer Hub Spindle Kit 5 Bolt on 5" Bolt Circle Fit for 3,500 lb. axles with 1-3/8 Inch to 1-1/16 Inch Tapered Spindles, Set of 2

#6

6. ROP Shop BT8 Axle Kit

• Weight: 34.6 lb

Best for: Four-position light-axle service.

Why it ranks #6: The pack of four includes 4-on-4 idler hubs and BT8 spindles, with 1,250-pound hub capacity and use on a 2,000-pound axle.

Four 4-on-4 idler hub and BT8 spindle kits give this ROP Shop pack its multi-position advantage. Each hub is rated at 1,250 pounds and is specified for use on a 2,000-pound axle shaft, enabling a buyer to source four matching assemblies for a compatible light-trailer service job.

Each assembly pairs a 4-inch bolt-pattern idler hub with a 1-inch BT8 round spindle measuring 83⁄4 inches long, including a 4-inch stub. The dimensions help buyers compare the spindle and hub geometry with their existing axle components. Four hubs arrive with lug nuts, castle nuts, pins, washers, bearings, and double-lip grease seals, supporting a coordinated service across several positions. The stated hub and axle capacities define its load-use boundary.

Skip it if you need a 5-on-4.5 layout; OZISENS’ YM-QC0010Z-2 kit uses that hub pattern.

Choose this pack when four matching assemblies are needed for a compatible 4-on-4 light-trailer setup. Buyers should weigh the stated 1,250-pound hub capacity and BT8 dimensions against their axle requirements.

Listed on Amazon as: The ROP Shop Pack of 4 – Trailer Axle Kits with 4 on 4" Bolt Idler Hub & 1 1/4" Round BT8 Spindle

#7

7. VIRTIONZ BT8 Hub Kit

• Weight: 17.35 lb
• Package Dimensions: 10.35 x 7.05 x 6.22 in

Best for: Two-set 4-on-4 axle repair.

Why it ranks #7: Two 4-on-4 hub and BT8 spindle kits include bearings, seals, and caps; each hub is rated at 1,250 pounds for use on a 2,000-pound axle.

VIRTIONZ supplies two 4-on-4 idler hubs with 1-inch BT8 round spindles, targeting a 2,000-pound axle-shaft application. The listing states a 1,250-pound capacity for each hub, so buyers get a straightforward paired kit with its capacity and wheel pattern clearly defined.

The two assemblies include hubs with lug nuts, BT8 spindles, castle nuts, pins, washers, inner and outer bearings, double-lip grease seals, and 2-inch grease or dust caps. Those components can streamline a two-side repair by keeping the listed bearing and sealing parts together. The spindle is specified as 83⁄4 inches long with a 4-inch stub, and the 4-on-4 bolt circle narrows compatibility to matching wheel layouts.

Skip it if you need a 5-on-5 bolt circle; FKG’s GL4856E-2PCS hub kit uses that pattern.

A buyer repairing both sides of a compatible 2,000-pound axle can use the paired hubs, BT8 spindles, bearings, and seals. The 4-on-4 pattern and hub capacity remain important limits.

Listed on Amazon as: Trailer Idler Hub Kit 2000 lbs with 4 on 4" Trailer Hub & 1" Round BT8 Spindle Two hubs,Trailer Axle Kits 4 Lug Include L44643 Bearings Kit,2 Sets

#8

8. labwork BT8 Hub Kit

• Weight: 17.2 lb

Best for: Two-set BT8 replacement.

Why it ranks #8: The two-set 4-on-4 package includes BT8 spindles, bearings, seals, and caps; each hub is rated for 1,250 pounds and fits standard 2,000-pound axles.

Two 4-on-4 idler hubs paired with 1-inch round BT8 spindles make the labwork kit a focused option for standard 2,000-pound trailer axles. The listing specifies a 1,250-pound rating per hub, providing a clear capacity reference alongside the four-lug wheel pattern.

The package includes two hubs with lug nuts, two BT8 spindles with castle nuts, pins and washers, four inner and outer bearings, two double-lip seals, and two 2-inch grease or dust caps. That grouping supports a two-side replacement without separately sourcing the named components. The 1/2-inch studs and 1.988-inch grease-cap flange diameter offer additional fit details. Its 4-on-4 pattern and BT8 spindle type are the main compatibility limits.

Skip it if you need a 5-lug hub; Saree’s TH007 kit has a 5-on-4.5-inch pattern for tapered axles.

This two-set package suits owners servicing a compatible 2,000-pound axle with 4-on-4 wheels and BT8 spindles. Check the hub rating, stud dimensions, and grease-cap flange against the existing parts.

Listed on Amazon as: labwork 2 Sets 4 on 4Inch Trailer Hub Kit and 1Inch Round BT8 Spindle

#9

9. labwork BT16 Hub Kit

• Weight: 9.99 lb
• Package Dimensions: 11.06 x 5.98 x 5.28 in

Best for: Single BT16 spindle replacement.

Why it ranks #9: This listing includes one 5-on-4.5-inch hub and a square BT16 spindle, with L44649 bearings; it is specified for standard 2,000-pound axles.

A square BT16 spindle distinguishes this labwork kit from the round-spindle options, making it relevant to buyers whose axle setup calls for that spindle style. The package pairs one spindle with a 5-on-4.5-inch hub and lists compatibility with most standard 2,000-pound trailer axles.

The hub includes inner and outer L44649/L44610 bearings, a grease seal, dust cap, and lug nuts; the spindle comes with its nut, washer, and cotter pin. Those included pieces support a component-level replacement rather than a hub-only purchase. The listed 1-1/16-inch BT16 spindle and five installed 1/2-inch-20 nuts help identify the configuration. Confirm the square-spindle arrangement and hub pattern against the existing axle before installation.

Skip it if you need two complete sides; RigsNParts’ RN-5X45H-2K+RN-SP17584X2 package supplies two hub-and-spindle sets.

This kit fits a buyer replacing one compatible hub-and-spindle position on a standard 2,000-pound trailer axle. Its square BT16 spindle and 5-on-4.5 wheel pattern are decisive fit considerations.

Listed on Amazon as: labwork 5 on 4.5 Inch Trailer Hub Kit and Square BT16 Spindle

#10

10. Saree 5-Lug Hub Kit

• Weight: 17.73 lb
• Package Dimensions: 14.45 x 8.5 x 5.55 in

Best for: Tapered 3500-pound axle hubs.

Why it ranks #10: The two-set hub package matches 3,500-pound tapered-spindle axles and 5-on-4.5-inch wheels, but the listing does not include spindles.

Two 5-on-4.5-inch hubs for 3500-pound axles anchor Saree’s kit, with compatibility listed for tapered spindles rather than straight spindles. That distinction helps buyers screen the assembly early, while specified L44649 outer and L68149 inner bearings identify the bearing arrangement.

The kit is listed for #84 EZ-Lube tapered axles and names compatibility with Dexter, Al-Ko, Lippert, and Quality 3500-pound trailer axles. Its 5-lug, 5-on-4.5-inch pattern defines the wheel connection, while the L44649 outer and L68149 inner bearing references help check the hub interface. The listing explicitly excludes straight spindles, making spindle style a critical boundary. Two sets provide a paired hub quantity for a compatible repair.

Skip it if you have a straight spindle; labwork’s 1-6711265-820174 kit lists a BT16 square spindle instead.

A buyer replacing hubs on a compatible 3500-pound tapered-spindle axle can use the paired quantity and named bearing sizes. Avoid this kit for straight spindles, and verify the 5-on-4.5 pattern.

Listed on Amazon as: 2 Sets 3500Lbs Axle Trailer Hub Kit 5 Bolt 4.5",5 Lug Trailer Hub Fit 1-1/16" to 1-3/8" Trailer Tapered Spindle,Boat Trailer Hubs 5 Lug,Trailer Wheel Hub Kit(Not fit Straight Spindle)