Steering Stem Nut for Harley-Davidson FX, FXR, Sportster 1971-1987 – Fitment Checked
Fitment Confirmed Before Quotation — Every steering stem nut is checked against the exact platform family and model year range to ensure the 7/8-24 I.D. thread matches your specific triple tree setup.
Product Specification
| Parameter | Value |
|---|---|
| OEM Reference | 45718-71 (reference only) |
| Part Type | Steering Stem Nut |
| Finish | Chrome Plated |
| Thread Specification | 7/8-24 I.D. thread |
Fitment
| Platform | Year Range | Notes |
|---|---|---|
| FX / FXR | 1971-1987 | Verify triple tree thread pitch before ordering |
| Sportster | 1978-1987 | Confirm exact model year for steering head cup compatibility |
Independent aftermarket part. Not manufactured, sold or endorsed by any motorcycle manufacturer. Model names and OEM numbers are used for fitment reference only.
Why Thread Pitch Matters for Steering Stem Hardware
A mismatched 7/8-24 I.D. thread will prevent the steering stem nut from seating correctly, leaving the front end unsecured.
Head cup and steering stem hardware sizes differ significantly between early and late frames [NEED_CITE: factory service manual specifications by model year]. Unclear listings often lead to incorrect thread pitches or diameters that fail to install. When a shop orders stem nuts just by referencing a cross-reference number without checking the exact thread specification, the parts sit on the bench for weeks. Verifying the exact frame year and model range is the only way to avoid this downtime.
Verifying Platform and Year Range
Fitment certainty starts with matching the steering stem nut to the correct platform family. The FX and FXR models from 1971 to 1987 share specific steering head dimensions, but the Sportster platform from 1978 to 1987 requires its own distinct verification. Overlooking the exact year range often results in receiving a nut that threads onto the stem but fails to interface with the frame neck. Always confirm the model and year range before finalizing the order.
Cross-Referencing Superseded Numbers
Part numbers are frequently superseded across model years, meaning a number from an older manual no longer matches the current replacement requirement. This steering stem nut cross-references against Harley-Davidson number 45718-71 (reference only) to identify the correct hardware for your build. Relying solely on an outdated catalog number without checking the physical thread specification can lead to ordering the wrong component. We verify the cross-reference against the exact platform to ensure compatibility [NEED_CITE: part number supersession charts by model year].
Understanding the 7/8-24 I.D. Thread Specification
The 7/8-24 I.D. thread specification dictates how the steering stem nut engages with the steering stem and the upper triple tree. The 7/8-inch diameter and 24 threads per inch must align perfectly with the existing stem threads. If the thread pitch is completely off for your specific triple tree setup, the nut will cross-thread or bind before reaching the proper preload. Measuring the existing stem threads with a caliper or thread gauge ensures the replacement hardware matches the original geometry.
The Hidden Cost of Incorrect Fitment
Ordering steering stem hardware without verifying the exact frame year and model range leads to immediate operational delays. A shop building a custom FXR might receive a nut with the wrong thread pitch, forcing the bike to sit on the lift while the correct part is sourced. This downtime disrupts the build schedule and delays customer deliveries. Furthermore,抄来的适配表错误一路传下去 (copied fitment tables with errors passed down the supply chain) result in multiple shops receiving the same incorrect hardware, compounding the wasted time and shipping costs [NEED_CITE: supply chain error propagation in aftermarket parts].
Sourcing from a Fitment-Focused Supplier
We confirm fitment against the platform family and model year range before providing a quotation for any steering stem nut. Our catalog offers cross-reference capabilities against Harley-Davidson OEM numbers, clearly marked reference only, to help you identify the correct hardware. We maintain a minimum order of one piece, allowing repair shops and custom builders to order a single replacement without meeting high volume thresholds. Every unit undergoes a quality inspection to ensure the chrome plated finish and thread specifications meet our standards.
Documentation Provided
- Fitment sheet listing the FX, FXR, and Sportster year ranges this part was checked against
- Cross-reference sheet with Harley-Davidson numbers marked reference only
- Finish specification detailing the chrome plated surface treatment
- Quality inspection record verifying the 7/8-24 I.D. thread dimensions
- Packing photographs showing the actual hardware included in the shipment
Receiving and Pre-Installation Checks
- Verify the 7/8-24 I.D. thread on the steering stem nut matches your existing steering stem before installation
- Check the chrome plated finish for any shipping damage or surface defects upon arrival
- Confirm the included hardware matches the fitment sheet for your specific FX, FXR, or Sportster model year
- Store the steering stem nut in a dry environment to prevent corrosion before installation
- Have a qualified technician verify the steering head cup dimensions if replacing early or late frame components
Requesting a Fitment Check
Send your exact model code and year range to verify if this steering stem nut fits your specific triple tree setup. Provide the old part number or a clear photograph of the existing steering stem threads to help us cross-reference the 7/8-24 I.D. specification. Let us know if you require a single piece for a restoration project or multiple units for your shop inventory.
Frequently Asked Questions
Q: How do I confirm if this steering stem nut fits my specific model year?
A: Provide your exact model code and year range, such as FXR 1987 or Sportster 1982. We verify the 7/8-24 I.D. thread specification against the steering head cup dimensions for that specific platform. Cross-referencing your existing part number or providing a photo of the stem threads also ensures an accurate fitment check before shipment.
Q: What are the differences in steering stem hardware between early and late frames?
A: Early and late frames often utilize different steering head cup sizes and bearing races, which changes the required stack height and thread engagement. The 7/8-24 I.D. thread on this nut is specific to the FX, FXR, and Sportster platforms listed. Checking your frame neck dimensions against the fitment sheet prevents ordering hardware that fails to interface with the triple tree.
Q: How do I measure and verify the 7/8-24 I.D. thread requirement?
A: Use a thread pitch gauge or a calibrated caliper to measure the inner diameter and count the threads per inch on your existing steering stem. The specification requires a 7/8-inch diameter with 24 threads per inch. Comparing these physical measurements to the product specifications ensures the replacement nut will thread on smoothly without cross-threading.
Q: Can I order a single piece for a restoration project?
A: Yes, we support a minimum order of one piece for independent repair shops, custom builders, and restoration specialists. This allows you to source a single steering stem nut for a specific bike build without meeting bulk quantity requirements. We provide a fitment sheet and cross-reference documentation with every single-piece order to ensure accuracy.
Q: How do you handle superseded Harley-Davidson part numbers?
A: We cross-reference superseded numbers against the current aftermarket replacement, marking the original number reference only. If your manual lists an older number, we verify the physical thread specification and platform fitment to ensure the replacement matches your actual hardware. This prevents ordering errors caused by outdated catalog numbers.