TRAILER TORSION AXLE HUB & SPINDLE ASSEMBLY
UFP - Left Hand - 3700 lb Trailer Disc Brake Torsion Arm End Unit 59 Spline 5 on 4.5
Part Number: 43039LU (Replaces 250-51014)
Genuine UFP 3,700 lb rated trailing torsion arm spindle and hub assembly featuring a 59-ridge spline, 5 on 4.5" bolt pattern, and integrated 1-3/8" x 1-1/06" tapered spindle.
SKU: 43039LU 3,700 LBS CAPACITY 59 SPLINE RIDGES
Specifications
| Specification |
Detail |
| Part Number / SKU |
43039LU (Replacement for 250-51014) |
| Brand |
UFP Trailer Parts |
| Product Type |
Trailer Torsion Arm Spindle & Hub Assembly |
| Spline Count |
59 Ridges (Peaks) |
| Spindle Size |
1-3/8" x 1-1/16" Tapered |
| Diameter & Bolt Circle |
9-3/4" Diameter | 5 on 4-1/2" Bolt Pattern |
| Capacity / Rating |
3,700 Lbs. |
| Bearings & Races |
Inner: L68149 (Race L68110) | Outer: L44649 (Race L44610) |
| Seal Dimensions |
1.68" ID x 2.56" OD |
| Mounting Hardware |
5/8" Torsion arm mounting bolt, nut, and washer included |
Fitment / Application
| Category |
Details |
| Vehicle / Trailer / System |
UFP Torsion Axle Systems |
| Primary Fit |
Direct replacement for UFP Part # 250-51014 |
| Secondary Fit / Common Use |
Marine & Utility trailers equipped with 3,700 lb UFP splined torsion arm axles |
| Fitment Method |
Splined torsion arm attachment (59-tooth pattern) secured via 5/8" bolt |
| Important Note |
Verify spline ridge count (59) and spindle taper dimensions prior to ordering. |
R&P Knowledge Hub
Compatibility: Replaces UFP 250-51014. Fits 5-bolt wheels on a 4-1/2" bolt pattern.
Vehicle / System Fit: Designed for marine and general cargo trailers utilizing UFP 3,700 lb splined torsion axles.
Installation Notes: Torque the included 5/8" mounting bolt to manufacturer specifications during arm attachment. Inspect bearings and pack with fresh high-temp marine grease prior to final hub assembly.
Pro Insight: Exact spline count is critical on UFP trailing arms; always count individual ridge peaks on your original spindle to ensure proper 59-spline mating.
Features
- Genuine UFP Trailer Parts construction
- Precision-machined 59-ridge splined shaft
- Rated for up to 3,700 Lbs. total axle capacity
- Includes inner (L68110) and outer (L44610) bearing races pre-installed
- Supplied with 5/8" torsion arm mounting bolt, washer, and lock nut
Included Components
| Quantity |
Item |
| 1 |
UFP Splined Spindle & 9-3/4" Hub Assembly (5 on 4.5") |
| 1 |
Inner Bearing Race L68110 (Pre-Installed) |
| 1 |
Outer Bearing Race L44610 (Pre-Installed) |
| 1 Set |
5/8" Torsion Arm Mounting Hardware (Bolt, Nut, Washer) |
Important Fitment Note: Please verify all spindle dimensions, spline ridge counts (59 peaks), hub bolt patterns (5 on 4.5"), and bearing inner/outer series before completing purchase. OEM references (such as 250-51014) are provided strictly for direct application and fitment cross-referencing.
UFP Trailer Parts 43039LU 250-51014 3700 lbs torsion arm spindle hub assembly 59 spline 5 on 4.5 bolt pattern L68149 L44649 L68110 L44610 marine trailer torsion spindle hub kit 1-3/8 x 1-1/16
