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. |
Set of eight 5/8"-18 fine-thread cone-style lug nuts for trailer wheel applications using a conical tapered seat. Designed for compatible trailer hubs and wheels requiring 5/8" wheel studs and tapered-seat lug nuts.
| Key Dimension | Measurement |
|---|---|
| Thread Size | 5/8"-18 fine thread |
| Stud Size | 5/8" |
| Hex / Socket Size | 1-1/16" |
| Seat Style | Conical / tapered seat |
| Specification | Detail |
|---|---|
| Part Number | 6-109X8 |
| Listing SKU | 6-109X8 |
| Brand | R&P Carriages |
| Product Type | Trailer wheel cone lug nut set |
| Quantity Included | 8 lug nuts |
| Material / Finish | Zinc-plated steel |
| Application | Trailer wheels with matching 5/8"-18 studs and tapered seats |
Designed for trailer wheel studs with a 5/8" diameter and 18 threads per inch.
Cone-seat design fits trailer wheels with matching tapered lug nut seats.
Steel construction with zinc plating for added rust and corrosion resistance in normal trailer use.
Includes eight lug nuts for trailer wheel replacement, service, or spare hardware stock.
| Category | Details |
|---|---|
| Vehicle / System | Trailer wheel and hub assemblies |
| Primary Fit | Wheels requiring 5/8"-18 conical seat lug nuts |
| Secondary Fit / Common Uses | Heavy-duty trailer axle applications, commonly 8K-12K where specs match |
| Verification Notes | Confirm stud diameter, thread pitch, seat style, socket size, and torque requirement before ordering or installing. |
| Quantity | Item |
|---|---|
| 8 | 5/8"-18 cone-style trailer wheel lug nuts |
| Not Included | Wheel studs, wheels, hubs, washers, tools, or additional hardware |
This listing is for one set of eight 5/8" cone lug nuts for trailer wheel service and replacement. These lug nuts use a 5/8"-18 fine thread, 1-1/16" hex size, and conical tapered seat. The zinc-plated steel finish helps resist rust and corrosion in normal trailer use.
Lug nut fitment depends on the wheel stud, thread pitch, and wheel seat style. Always confirm all three before installation.
Compatibility: Designed for trailer wheels using 5/8"-18 wheel studs and conical tapered-seat lug nuts.
Vehicle / System Fit: Commonly used on heavy-duty trailer axle applications, including many 8,000 lb to 12,000 lb axle setups where the wheel and stud specifications match.
Installation Notes: Confirm the stud diameter, thread pitch, wheel seat style, socket size, and torque specification for your axle or wheel before installation.
Performance Insight: Cone lug nuts center the wheel against the matching tapered seat. Correct seating helps provide even clamping force and reduces the risk of wheel movement.
Selling Brand: R&P Carriages
Application Reference: Trailer wheel lug nut set for 5/8"-18 studs with conical tapered-seat wheels.
What This Means: This listing includes eight individual lug nuts, enough for one 8-lug trailer wheel position when the matching stud and seat style are required.
Before Ordering: Match the old lug nut and wheel seat style. Do not substitute cone-seat lug nuts on wheels designed for flat, flange, mag, or other seat styles.
Lug nuts should be inspected whenever wheels are removed, studs are replaced, or axle service is performed. Replace damaged, rounded, cross-threaded, corroded, or mismatched lug nuts before returning the trailer to service.
Selected from R&P customer feedback for Trailer Axle / Running Gear products and related trailer service.
“Got me the axle I needed right away with custom spring perch setting.”
“Had a trailer made to my needs.ken was able to get it done and at a price that was very acceptable.i have bought parts there for 2 other trailers and always in stock”
“Quality work. Staff is polite. Great job welding a project for me. Didn't even want to charge me, so I bought them a case of Corona. They were ecstatic. I ever need a welding or like that R&P Carriages is #1 !!!!!”
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