At a Glance
- >Genuine Lippert (LCI) steel locknut
- >1-3/4"-12 thread size
- >Castle nut design for cotter pin retention
- >Zinc-plated finish for corrosion resistance
- >Fits Rockwell 12K–16K axles
- Brand: R & P Carriages
- SKU: 330037
Before You Order
Match the part number, measurements and connection points that apply to your trailer.
Fitment Check
| 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
Lippert / LCI Steel Castle Locknut — 1-3/4"-12 Thread
Part Number: 330037
This heavy-duty Lippert (LCI) steel castle locknut is designed for use on Rockwell 12K–16K axle assemblies. Featuring a 1-3/4"-12 thread size and a zinc-plated finish, it is built for durability and corrosion resistance in demanding trailer applications.
R&P Knowledge Hub
Castle locknuts are designed to be secured with a cotter pin through the spindle to prevent loosening under load. Proper thread engagement and alignment with the cotter pin hole are critical for safe installation.
Always confirm thread size and axle specifications before replacement.
Features
- Genuine Lippert (LCI) steel locknut
- 1-3/4"-12 thread size
- Castle nut design for cotter pin retention
- Zinc-plated finish for corrosion resistance
- Fits Rockwell 12K–16K axles
Specifications
| Specification | Detail |
| Manufacturer | Lippert (LCI) |
| Thread Size | 1-3/4"-12 |
| Nut Style | Castle nut |
| Finish | Zinc plated |
| Axle Fit | Rockwell 12K–16K Axles |
| Part Number | 330037 |
This locknut is commonly used to secure hub and spindle assemblies on heavy-duty Rockwell trailer axles. Verify thread size and compatibility before installation.
Included Components
| Quantity | Item |
| 1 | Castle Locknut |
Shipping: Calculated at checkout.
CUSTOMER PROOF
What customers say about parts like this.
Selected from R&P customer feedback for Trailer Axle / Running Gear products and related trailer service.
RELEVANT TO
Trailer Axle / Running Gear
★★★★★GOOGLE REVIEW
“Got me the axle I needed right away with custom spring perch setting.”
★★★★★GOOGLE REVIEW
“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”
★★★★★GOOGLE REVIEW
“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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