1/2″-20 Thread With 3-Inch Length
The Moroso 46180 uses a 1/2″-20 thread and measures 3 inches long.
Moroso measures wheel-stud length from the base of the knurl to the end of the stud, an important detail when comparing it with factory or competing wheel studs.
The extended 3-inch length is particularly useful with thick racing wheels and applications where additional visible thread engagement is desirable.
Moroso specifically states that these extra-long studs exceed sanctioning-body requirements for use with thick-hub racing wheels.
For a competition vehicle, an extended stud also makes it much easier to visually verify adequate lug-nut engagement before the car heads onto the track.
.615-Inch Knurl Diameter
The Moroso 46180 uses a .615-inch nominal knurl diameter.
That measurement is just as important as the 1/2″-20 thread.
A press-in wheel stud relies on interference between the knurled section of the stud and the hole in the hub or axle flange. If the hole is too large, the stud may not remain securely retained. If it’s too small, forcing the stud into place can damage the hub or stud.
Moroso lists a standard hub-hole range of:
.606 to .613 inch
for the 46180 application.
Before installation, measure the actual hub and stud rather than relying entirely on catalog dimensions.
Fits Many Ford Disc-Brake Applications
Moroso lists the 46180 for most late-model Ford front and rear disc-brake applications using the appropriate hub dimensions.
That makes it useful across numerous performance Ford builds, including:
- Street/strip Fords
- Modified Mustangs
- Drag cars
- Road-race builds
- Pro Street vehicles
- Custom Ford brake conversions
- Racing hubs using compatible dimensions
Mustang owners need to pay particularly close attention to the knurl specification, however, because Moroso uses different wheel studs for different Mustang generations and axle positions.
2005-and-Newer Mustang Rear Applications
Moroso specifically lists the 46180 for the rear of 2005-and-newer Ford Mustangs.
That’s important because it shouldn’t be confused with Moroso part 46185.
The 46185 also uses a 1/2″-20 x 3-inch configuration, but it has a smaller .594-inch knurl and is specified for 1979–2004 Mustangs and 2005-and-newer Mustang front hubs.
If you’re working through other Mustang chassis, brake or wheel upgrades, the Mustang technical articles on My Pro Street can help identify the differences between generations before ordering components that appear similar in a catalog.
For wheel studs specifically, though, always measure the hub.
A Mustang badge isn’t a precision measuring instrument.
Chrysler Front Applications
Moroso also lists the 46180 for compatible Chrysler front brake and hub applications using the appropriate 1/2″-20 thread and hub-hole diameter.
Don’t automatically use the 46180 on the rear simply because it fits the front.
Moroso lists the 46190 for many Chrysler rear applications. That stud also uses a 1/2″-20 x 3-inch configuration but has a substantially larger .685-inch knurl.
This is exactly why thread size alone isn’t enough to determine wheel-stud compatibility.
Two wheel studs can accept the same lug nut and still require completely different hub dimensions.
Quick-Start Dog End
The Moroso 46180 incorporates a quick-start dog end to make starting the lug nut easier.
The reduced section at the tip helps guide the lug nut onto the threads, which can reduce the chance of cross-threading during installation.
That’s useful on any car, but it becomes particularly convenient on a race vehicle where wheels and tires may be removed repeatedly during a single event.
It’s a small feature.
So is cross-threading a lug nut—right up until you’re trying to fix it in the staging lanes.
Designed for Thick-Hub Racing Wheels
The extended length of the Moroso 46180 makes it particularly suitable for thick-hub racing wheels.
Thicker wheel centers consume more of the available stud length than many factory wheels, making adequate thread engagement an important consideration.
Extended studs allow the lug nut to maintain sufficient engagement while also making the end of the stud more visible with open-ended racing lug nuts.
This type of setup is common in:
- Drag racing
- Road racing
- Autocross
- Time attack
- Pro Street
- Competition-oriented street builds
Proper wheel hardware becomes increasingly important as vehicle speed, tire grip and braking capability increase.
Do Not Use the Moroso 46180 With Wheel Spacers
Moroso gives an explicit warning for this part:
Do not use the 46180 wheel studs with wheel spacers.
The fact that the stud is longer than factory hardware doesn’t automatically make it appropriate for spacer use.
If your wheel offset or brake package requires a spacer, use studs and hardware specifically approved for that configuration.
Don’t treat additional thread length as permission to invent a wheel-retention system.
Correct Press Fit Matters
Installing a press-in wheel stud correctly requires more precision than simply hammering it into the hub.
Moroso recommends measuring both the hub hole and actual knurl diameter before installation.
For the nominal .615-inch 46180 stud, the company provides different interference-fit recommendations depending on hub material.
For a steel hub, Moroso recommends approximately .006 to .016 inch of interference.
For an aluminum hub, the recommended interference is approximately .006 to .010 inch.
The exact dimensions should be determined from the measured stud and hub—not simply the nominal catalog numbers.
Ream the Hole When Necessary
If the hub needs to be resized, Moroso recommends finishing the hole with an appropriately sized reamer.
A drill bit isn’t considered precise enough for final sizing because the acceptable interference range is measured in thousandths of an inch.
A reamer produces a more accurately sized and round opening, which is important when the knurl needs to create a controlled press fit.
That precision matters because an undersized hole can damage components during installation, while an oversized hole may allow the stud to rotate.
Neither outcome is something you want to discover while torquing the lug nuts.
Wheel Stud Replacement and Brake Service
On many vehicles, replacing wheel studs requires removing at least part of the brake assembly to gain sufficient access to the hub.
That’s a good opportunity to inspect the surrounding brake components for:
- Rotor wear
- Cracks or heat checking
- Wheel-bearing play
- Hub damage
- Caliper condition
- Brake-hose deterioration
- ABS wiring damage
- Damaged lug nuts
- Additional worn wheel studs
The hydraulic system normally doesn’t need to be opened simply to replace a wheel stud. If brake lines or calipers are disconnected during related repairs, however, correct bleeding becomes critical. Our brake bleeding and soft-pedal troubleshooting articles cover the diagnostic side of removing trapped air rather than simply pumping the pedal and hoping for the best.
Wheel hardware and brake hardware live in the same neighborhood.
When one is apart, inspecting the other is cheap insurance.
Check Your Lug Nuts
New performance wheel studs should be paired with lug nuts that are in good condition and properly matched to the wheel.
Inspect existing lug nuts for:
- Damaged threads
- Cross-threading
- Corrosion
- Distorted seating surfaces
- Incorrect seat design
- Excessive wear
Moroso lists its 46330 1/2″-20 lug nuts as the corresponding lug nut for the 46180.
Moroso also offers part 46480, which combines five 46180 studs with five matching 46330 lug nuts.
Always make sure the lug-nut seat matches the wheel itself.
Correct thread size doesn’t automatically mean correct lug-nut fitment.
Five Studs Per Package
Moroso packages part number 46180 as a set of five wheel studs.
That makes one package appropriate for a typical five-lug hub or axle flange when all five studs are being replaced.
For performance applications, replacing the complete set can make more sense than mixing heavily used factory studs with new extended racing studs.
If one stud has failed because of damaged threads, excessive torque or years of repeated wheel changes, inspect the remaining studs carefully before putting the car back into service.
Made in the USA
Moroso identifies part number 46180 as a USA-manufactured product.
That matches the supplied country-of-origin specification and Moroso’s current country-of-origin documentation.
Moroso 46180 Specifications
Part Number: 46180
Product Type: Press-In Wheel Stud
Thread Size: 1/2″-20
Stud Length: 3 inches
Knurl Diameter: .615 inch nominal
Standard Hole Size: .606–.613 inch
Material: SAE 8740 steel
Finish: Black
Stud Style: Press-in
Tip: Quick-start dog end
Quantity: 5 studs per package
Primary Applications: Most late-model Ford front/rear disc brakes, 2005+ Mustang rear, compatible Chrysler front
Wheel Spacers: Not approved for use with wheel spacers
Country of Origin: United States
Package Length: 7.19 inches
Package Width: 5.38 inches
Package Height: 0.94 inch
Package Weight: Approximately 1 lb
Verify Fitment Before Ordering
Retail databases frequently categorize the Moroso 46180 as a vehicle-specific part.
For practical installation purposes, it should be treated as application-specific hardware.
Before ordering, verify:
- 1/2″-20 thread requirement
- Existing hub-hole diameter
- Required .615-inch knurl
- Hub material
- Available backside clearance
- Wheel thickness
- Lug-nut configuration
- Axle or hub modifications
This becomes especially important on older performance vehicles.
If the car has aftermarket axles, upgraded brakes or replacement hubs, the factory year/make/model specification may no longer tell you which wheel stud is installed.
Measure what’s on the car.
Who Should Buy the Moroso 46180?
The Moroso 46180 is a strong option for enthusiasts who need an extended 1/2″-20 press-in wheel stud with a .615-inch knurl.
It’s particularly appropriate for:
- Compatible Ford disc-brake hubs
- 2005+ Mustang rear hubs
- Compatible Chrysler front hubs
- Drag-racing cars
- Road-race vehicles
- Autocross builds
- Pro Street cars
- Vehicles using thick-hub racing wheels
It isn’t the correct stud for every Ford or Mustang, and the .615-inch knurl needs to match the hub.
Final Verdict
The Moroso 46180 1/2″-20 x 3-inch Press-In Wheel Stud provides a high-strength wheel-retention solution for compatible Ford and Chrysler performance applications.
Its SAE 8740 steel construction, extended 3-inch length, .615-inch knurl and quick-start dog end make it particularly well suited to racing applications and thick-hub wheels.
The most important part of the installation isn’t the black finish or even the extra length.
It’s the press fit.
Measure the stud, measure the hub and make sure the interference is correct before installation.
Wheel studs are one of the rare places on a performance car where being off by a few thousandths of an inch can become significantly more exciting than anyone intended.
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