Trailer Hub Hardware / Drive-In Wheel Studs
Set of 5 Drive-In Trailer Wheel Studs 1/2"-20 x 2" Fits Ranger / UFP Hubs 33038U-5
Set of five drive-in trailer wheel studs for compatible Ranger and UFP-style trailer hubs. Commonly found on boat trailer hub applications and useful for replacing worn, stripped, rusted, missing, or damaged studs during hub, wheel, brake, or bearing service.
Part Number: 33038U-5 Set of 5 Studs 1/2"-20 x 2"
Overview
This 33038U-5 wheel stud set includes five drive-in / press-in trailer wheel studs for compatible Ranger and UFP-style boat trailer hubs. Each stud uses 1/2"-20 threads, 2" overall length, 0.25" spline length, 0.65" base diameter, and 0.562" spline diameter. This set is intended for hubs that use matching press-fit studs; verify all dimensions against your original stud before installation.
R&P Service Insight
Wheel studs are critical wheel-retention hardware. A damaged or loose stud can prevent proper lug nut torque and may create a wheel safety issue, especially on trailers exposed to water, road salt, and repeated loading cycles.
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Thread Damage: Replace studs with stripped, stretched, cross-threaded, or badly corroded threads.
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Press-Fit Security: The spline diameter must match the hub bore so the stud locks into the hub correctly.
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Boat Trailer Use: Water exposure can accelerate corrosion, making wheel stud inspection important during hub and bearing service.
R&P Knowledge Hub
Compatibility: Fits compatible Ranger / UFP trailer hubs that use a drive-in wheel stud with 1/2"-20 thread, 2" overall length, 0.25" spline length, 0.65" base, and 0.562" spline diameter.
Vehicle / System Fit: Commonly found on boat trailer hub applications using UFP-style hub hardware.
Installation Notes: Wheel studs are not universal by thread size alone. Match the thread pitch, overall length, spline / knurl diameter, spline length, base diameter, and hub bore before pressing the stud into the hub.
Performance Insight: A properly matched drive-in stud should seat squarely in the hub and resist spinning during lug nut torque. Incorrect spline sizing can lead to stud spin, inaccurate torque, or hub damage.
Brand & Fitment Note
Selling Brand: R&P Carriages
Application Reference: Ranger and UFP names are used as compatibility, hub-style, and application references only for trailer hubs where the original stud dimensions match.
What This Means: This listing is for a five-piece replacement wheel stud set for compatible Ranger / UFP-style trailer hubs. It is not a universal wheel stud set for every 1/2"-20 trailer hub.
Before Ordering: Compare your original stud to the measurements below, especially spline / knurl diameter and overall length. If your hub uses a different spline diameter, base size, or stud length, this part may not fit correctly.
R&P Repair Insight
Drive-in wheel studs are identified by their full measurement profile, not just the lug nut thread size. The most common fitment mistake is matching the 1/2"-20 thread while overlooking the spline diameter that holds the stud in the hub.
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Spline Diameter Check: This stud is listed with a 0.562" spline diameter. Compare against your original stud and hub bore.
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Length Check: This stud is listed as 2" long. Confirm proper lug nut engagement without bottoming out or interference.
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Press-In Check: The stud should press in squarely and seat firmly. Do not force a mismatched stud into the hub with the lug nut.
Features
Drive-In / Press-In Design
Designed for compatible trailer hubs that use press-fit wheel studs rather than threaded-in studs.
1/2"-20 Threads
Common fine-thread wheel stud configuration for matching trailer lug nut and hub applications.
0.562" Spline Diameter
Listed spline / knurl diameter helps confirm whether the stud will properly retain in the hub bore.
Five-Stud Service Set
Includes five individual studs for hub service, repair, or multi-stud replacement work.
Specifications
| Specification | Detail |
| Part Number | 33038U-5 |
| Brand | R&P Carriages |
| Product Type | Drive-in / press-in trailer wheel stud set |
| Application | Trailer hub wheel stud replacement |
| Thread Size | 1/2"-20 |
| Overall Length | 2" |
| Spline Length | 0.25" |
| Base Diameter | 0.65" |
| Spline / Knurl Diameter | 0.562" |
| Quantity | 5 wheel studs |
Fitment / Application
| Category | Details |
| Vehicle / System | Trailer hub / wheel mounting hardware |
| Primary Fit | Compatible Ranger / UFP-style trailer hubs using matching 1/2"-20 x 2" drive-in studs |
| Common Application | Boat trailer hub service and wheel stud replacement where original dimensions match |
| Notes | Confirm thread size, overall length, spline / knurl diameter, spline length, base diameter, hub bore, and lug nut compatibility before installation. Fitment is measurement-based. |
Included Components
| Quantity | Item |
| 5 | Drive-in / press-in trailer wheel studs |
| Not included | Lug nuts, hub, wheel, bearings, seals, brake parts, or installation tools |
Verify your original wheel stud dimensions before ordering. Thread pitch alone does not confirm fitment. The spline / knurl diameter must match the hub bore for proper press-fit retention. Incorrect stud sizing can cause stud spin, poor torque retention, or hub damage.
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