1. Product Overview
The Husqvarna 584953901 Hex Head Screw is a genuine OEM replacement part designed for various Husqvarna, Poulan, and Ryobi lawn and garden equipment. This pack includes four (4) screws, essential for securing components such as blade spindles on compatible models. These screws are typically self-tapping, facilitating installation into unthreaded components.

Image 1: A single Husqvarna 584953901 Hex Head Screw, black oxide finish, with a hex head and threaded shaft.
2. Safety Information
Always prioritize safety when performing maintenance or repairs on power equipment. Failure to follow safety instructions can result in serious injury.
- Disconnect Power: Before beginning any work, ensure the equipment is turned off, the spark plug wire is disconnected (for gasoline engines), and any power sources are removed.
- Wear Protective Gear: Use appropriate personal protective equipment (PPE), including safety glasses and gloves.
- Use Correct Tools: Employ the correct tools for the job to prevent damage to parts or injury.
- Secure Equipment: Ensure the equipment is stable and cannot move unexpectedly during installation.
- Small Parts: Keep small parts away from children and pets.
3. Installation Guide
These hex head screws are designed for specific applications, often involving the attachment of components like blade spindles to mower decks. Proper installation is crucial for equipment functionality and safety.
3.1. Pre-Installation Checks
- Consult Owner's Manual: Refer to your equipment's specific owner's manual for detailed instructions on part identification and removal/installation procedures. This is critical for ensuring correct part usage and avoiding damage.
- Verify Compatibility: Confirm that the Husqvarna 584953901 screw is the correct replacement part for your specific equipment model. Refer to the compatibility list in Section 7.
- Inspect Components: Before installation, inspect the mating components (e.g., spindle housing, deck) for any damage, wear, or debris that could hinder proper fitment.
3.2. Installation Steps
- Remove Old Fasteners: Carefully remove any existing screws or fasteners. Be aware that old screws, especially those securing spindles, may be seized or prone to breaking.
- Position Component: Place the component to be secured (e.g., new spindle assembly) into its correct position on the equipment.
- Insert Screws: Insert the Husqvarna 584953901 Hex Head Screws into the designated holes. These screws are often self-tapping, meaning they will cut their own threads into the component.
- Tighten Screws: Using an appropriate wrench or socket, gradually tighten each screw. Apply even pressure and tighten in a crisscross pattern if multiple screws are used to ensure uniform seating. Do not overtighten, as this can strip threads or damage components. Refer to your equipment's manual for specific torque specifications if available.
- Final Check: After tightening, ensure the component is securely fastened and does not exhibit any wobble or looseness.

Image 2: An angled view of the Husqvarna 584953901 Hex Head Screw, highlighting the hex head and thread design.
4. Maintenance and Inspection
While the screws themselves require minimal maintenance, regular inspection of all fasteners on your equipment is recommended to ensure continued safe operation.
- Periodic Checks: Periodically inspect the screws for tightness, corrosion, or signs of wear.
- Replace if Damaged: If any screw shows signs of damage, stripping, or significant corrosion, replace it immediately with a genuine Husqvarna replacement part.
5. Troubleshooting
If you encounter issues during installation or operation related to these screws, consider the following:
- Screw Does Not Tighten:
- Ensure you are using the correct screw for the application.
- Check if the receiving hole is stripped. If so, the component may need repair or replacement.
- Verify the screw is self-tapping if the hole is unthreaded.
- Screw Breaks During Installation:
- This can occur if overtightened or if the hole is misaligned or too small.
- Remove the broken screw carefully and replace it with a new one.
- Ensure proper alignment and avoid excessive force.
- Component Remains Loose:
- Re-check all screws for proper tightness.
- Inspect the component and mounting points for damage or wear that prevents a secure fit.
6. Specifications
| Feature | Detail |
|---|---|
| Part Number | 584953901 (Replaces 539107630) |
| Brand | Husqvarna |
| Fastener Type | Hexagon Bolt (Hex Head Screw) |
| Head Style | Hex |
| Thread Size | 5/16"-18 UNF |
| Exterior Finish | Black Oxide |
| Manufacturer Grade | Grade 4 |
| Product Dimensions | 1 x 2 x 1.5 inches (approximate, for a single screw) |
| Weight | 2.08 ounces (for the pack of 4) |
7. Compatibility
This screw is compatible with a wide range of lawn and garden equipment models from Husqvarna, Poulan, and Ryobi. Always cross-reference with your equipment's owner's manual for the exact part number required.
Compatible Models Include:
- Poulan: PP1136J, PP1136JA, PP11536, PP11536A, PP11536K, PP11536KA
- Ryobi: HDK19H42
- Husqvarna: 2042 LS, 2246 LS, 2346 XLS, 2348 LS, 2748 GLS, 2754 GLS, GT 200, GT 2254, GTH 200, GTH 220, GTH 2248 XPA, GTH 2248 XPB, GTH 2248 XPC, GTH 2250 A, GTH 2250 B, GTH 2254 XP, GTH 2254 XPA, GTH 2254 XPB, GTH 2350, GTH 2448 T, GTH 2454 T, GTH 250, GTH 2548, GTH 2548 A, GTH 2548 B, GTH 2548 XPA, GTH 2548 XPB, GTH 2550 A, GTH 2550 B, GTH 2554 XPA, GTH 2554 XPB, GTH 26 K 54, GTH 26 K 54 T, GTH 2648, GTH 2654, GTH 2654 T, GTH 2754, LGT 2654, LOGTH 2448 T, LOYTH 20 F 42 T, LR 110, LR 111, LR 12, LR 120, LR 121, LR 125, LRH 125, LT 120, LT 1238 C, LT 1238 D, LT 125, LT 130, LT 1538 A, LT 1538 B, LT 1538 C, LT 1538 D, LT 16542, LT 18542, LT 18542 A, LT 18542 B, LTH 130, LTH 1342, LTH 1342 C, LTH 140, LTH 145, LTH 1538, LT 1538, LTH 1542, LTH 1742 A, LTH 1742 B, LTH 1742 C, LTH 1742 D, LTH 18542 A, LTH 18542 B, LTH 18542 C, LTH 2042 A, LTH 2042 B, LTH 2042 C, PB 19546 LT, YT 150, YT 180, YT 190, YT 1942 T, YTH 1342 XPA, YTH 150
8. Warranty and Support
As a genuine OEM Husqvarna replacement part, this product is subject to Husqvarna's standard warranty policy for replacement parts. For specific warranty details or technical support, please contact Husqvarna customer service or visit their official website.
Husqvarna Official Website: www.husqvarna.com





