4738-28 Replacement Wheel Stud – 5/8"-18 Thread – 2.75" Usable Length – 0.648" Knurl
Heavy-duty press-in replacement wheel stud for compatible Rockwell-style 10K trailer hub and one-piece drum applications where the thread size, knurl diameter, and stud length match.
Overview
This 4738-28 replacement wheel stud is built for heavy-duty trailer hub and drum service where a 5/8"-18 press-in stud with a 0.648" knurl is required. It is commonly used with Rockwell-style 10K one-piece drum assemblies, but stud dimensions must be verified before ordering or installation.
R&P Service Insight
Wheel studs are small components with a major job. On heavy trailer axles, the correct thread size, knurl diameter, and usable length all matter for wheel retention and proper hub or drum fit.
- Knurl Match: The 0.648" knurl must match the hub or drum hole so the stud can seat securely when pressed in.
- Thread Match: The 5/8"-18 thread must match the wheel nut used on the trailer assembly.
- Length Check: Verify usable length and thread engagement before installation, especially when replacing studs on 10K and larger trailer axle systems.
R&P Knowledge Hub
Compatibility: Intended for compatible Rockwell-style 10K trailer hub and one-piece drum applications where the listed dimensions match the existing stud.
Vehicle / System Fit: Heavy-duty trailer hub and drum assemblies using a 5/8"-18 press-in wheel stud.
Installation Notes: Always verify knurl diameter, thread size, usable length, thread length, and hub or drum hole condition before pressing in a new stud.
Performance Insight: A press-in wheel stud relies on the knurled shoulder locking tightly into the hub or drum. A loose or mismatched knurl can compromise seating and retention.
Brand & Fitment Note
Selling Brand: R&P Carriages replacement component.
Application Reference: Rockwell names or Rockwell-style references in this listing describe application style and compatibility target only where the listed measurements match.
What This Means: This listing is for one replacement wheel stud, not a guaranteed OEM-branded item unless specifically stated and verified.
Before Ordering: Verify your existing wheel stud dimensions, hub or drum style, knurl diameter, thread size, and required length before installation.
R&P Repair Insight
When replacing trailer wheel studs, do not rely on axle capacity alone. Similar heavy-duty hub and drum assemblies can use different knurl sizes, thread lengths, and shoulder dimensions.
- Measure the Old Stud: Compare thread size, thread length, usable length, overall length, and knurl diameter before ordering.
- Inspect the Bore: A damaged, enlarged, or worn stud hole may prevent the new stud from locking correctly.
- Press-In Fit: Install using proper press-in service methods. Do not assume the wheel nut alone is the correct installation tool.
Features
5/8"-18 Thread Size
Matches heavy-duty trailer wheel nut applications requiring a 5/8"-18 threaded wheel stud.
0.648" Knurl Diameter
Designed for press-in hub or drum applications where a 0.648" knurled shoulder is required.
2.75" Usable Length
Provides the listed usable stud length for compatible 10K trailer hub and drum assemblies.
Heavy-Duty Press-In Design
Press-in style replacement stud for trailer hub and one-piece drum service where measurements match.
Specifications
| Specification | Detail |
|---|---|
| Part Number | 4738-28 |
| Brand | R&P Carriages replacement component |
| Product Type | Press-in trailer wheel stud |
| Application | Heavy-duty trailer hub and drum assemblies |
| Thread Size | 5/8"-18 |
| Overall Length | 3.136" |
| Usable Length | 2.75" |
| Thread Length | 2.166" |
| Insert Length | 0.565" |
| Knurl Diameter | 0.648" |
| Head Diameter | 0.394" |
Fitment / Application
| Category | Details |
|---|---|
| Vehicle / System | Heavy-duty trailer axle hub and drum system |
| Primary Fit | Commonly used with Rockwell-style 10K one-piece drum assemblies where dimensions match |
| Secondary Fit | Other compatible trailer hub or drum applications requiring the same stud dimensions |
| Notes | Verify thread size, knurl diameter, usable length, thread length, and hub or drum hole size before ordering or installing. |
Included Components
| Quantity | Item |
|---|---|
| 1 | Replacement wheel stud, part number 4738-28 |
