At a Glance

> 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.
> 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.
Brand: Rockwell
SKU: 4738-28

Before You Order

Match the part number, measurements and connection points that apply to your trailer.

Hub Face	Measure hub face to hub face.
Spring Center	Measure mounting centers and confirm perch configuration.
Capacity	Match the required axle rating.
Brakes	Confirm brake type and flange configuration.

Product Details

Trailer Wheel Stud / Rockwell-Style 10K Hub & Drum Hardware

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.

Part Number: 4738-28 5/8"-18 Thread 0.648" Knurl

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

Verify all measurements, thread size, knurl diameter, usable length, hub or drum hole condition, and wheel nut compatibility before installation. Rockwell-style references in this listing describe application fitment only and do not identify this item as a guaranteed OEM-branded component.

View More Wheel Stud Options

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Rockwell Wheel Stud – 5/8"-18 Thread – 2.75" Length – 0.648" Knurl (4738-28)