Harley X440 / X440 OBDII / X440T / X440X / Hero Mavrick 440 Thrust Washer 21mm OEM | HDH90451-ABY-000

Buy genuine OEM thrust washer 21mm for the Harley / Hero 440 platform with part number HDH90451-ABY-000. The catalogue description is WASHER THRUST 21MM, but in customer language this part is easier to understand as thrust washer 21mm, transmission thrust washer 21mm, gearbox thrust washer 21mm.

This part is used inside the transmission / gearbox assembly and is important for maintaining the correct internal fit, movement, spacing, drive transfer, or retention depending on its specific position. For this exact SKU, it works as the 21 mm thrust washer used to control spacing and end movement of internal gearbox components. Buyers usually search for it when there is excess end play, worn faces, missing washer, internal noise, or rebuild-time hardware replacement.

This listing is intentionally written for real buyers, mechanics, rebuilders, and workshops. Instead of leaving the product hidden behind only a factory shorthand, it clearly explains what the part does, why it matters, and what kind of repair situation usually leads to replacement. That makes the page easier to find in search and easier to understand before ordering.

Compatible models: Harley-Davidson X440, X440 OBDII, X440T, X440X, and Hero Mavrick 440. This cross-model compatibility is being applied to this transmission batch exactly as supplied for these 440 platform parts.

Important: This listing is for the individual OEM part only. It is not a lock washer and not a full washer kit. Please match the old part number, assembly position, and exact requirement before ordering.

Key Features

• Genuine OEM transmission-related part
• Part number: HDH90451-ABY-000
• Catalogue description: WASHER THRUST 21MM
• Customer-friendly identity: Thrust Washer 21mm
• Natural search terms: thrust washer 21mm, transmission thrust washer 21mm, gearbox thrust washer 21mm
• Made for correct internal gearbox fit and function
• Suitable for serious gearbox repair, rebuild, or exact replacement work
• Customer-focused naming to reduce wrong-order confusion

Compatibility

Variants

None.

What’s in the Box

• 1 x HDH90451-ABY-000 – Thrust Washer 21mm

Installation & Maintenance Notes

• Please match the old part number before ordering.
• Confirm the exact assembly position during transmission repair.
• Internal gearbox parts should be installed by a competent technician.
• Inspect related shafts, gears, bushes, washers, clips, and seals during overhaul.
• Do not force-fit internal transmission components.

Before You Order

This is a technical internal part. Please do not order only by looking at the image or by reading a partial item name.

Check the old part number, gearbox position, and rebuild requirement before purchase. That is especially important for gears, bushes, washers, circlips, and similar transmission hardware that can look similar but are not interchangeable.

Why Buy From Under The Hood

• Buyer-friendly naming instead of confusing catalogue-only wording
• Clear part-number-first listing for faster verification
• Built to reduce wrong orders on technical internal parts
• Useful for workshops, mechanics, and exact replacement buyers

FAQs

1. What is HDH90451-ABY-000?
It is the OEM thrust washer 21mm for the listed 440 platform transmission batch.

2. Which bikes is this listed for?
This batch is being listed for Harley-Davidson X440, X440 OBDII, X440T, X440X, and Hero Mavrick 440 as supplied for these transmission parts.

3. Is this a genuine OEM part?
Yes, this listing is for the OEM part number HDH90451-ABY-000.

4. Is this a complete kit?
No. This listing is for the individual part only unless specifically stated otherwise.

5. Why is the exact part number important?
Technical gearbox parts can look similar but still be different in size, profile, position, or function. Matching the exact part number helps avoid wrong orders.

6. When should this part be replaced?
Replace it when the original part is worn, damaged, missing, or found unserviceable during gearbox repair or rebuild work.

7. What should be checked before ordering?
Confirm the old part number, exact gearbox position, and transmission requirement before purchase.