Royal Enfield 111161/A Lock Washer (Tab Washer) for Gearbox/Front Sprocket Nut – Bullet 350/500 (Iron Barrel/AVL) Final Drive

Sold As A Set of 2 Piece 
If your old-school Royal Enfield Bullet uses a tab/lock washer behind the gearbox (front) sprocket nut, this is the correct OEM-style Lock Washer – Part No. 111161/A. Its job is simple but critical: once the sprocket nut is torqued, the washer tab is bent to lock the nut and prevent it from loosening under vibration—especially common on long rides and rough roads.

This part is commonly listed in classic Bullet “chain & sprocket” catalogs as Lock Washer 111161, used with the final drive / gearbox sprocket setup (including older 18T sprocket references).

⚠️ Important: This is NOT a UCE/J-Series/650 part by default. Many customers mistakenly order it for Classic 350 Reborn / Meteor / Hunter / Interceptor—please match your existing washer shape or confirm via your mechanic/EPC before ordering.

Key Features 

• Genuine-spec tab/lock washer for sprocket nut locking

• Prevents front (gearbox) sprocket nut loosening under vibration

• Correct thickness & bendable tab design for secure locking

• Ideal for rebuilds: sprocket change, chain kit replacement, gearbox work

• OEM reference: 111161/A (also seen as 111161 in catalogs)

• Low-cost part that avoids high-cost failures (sprocket play, spline damage)

Compatibility 

✅ Confirmed Use-Case (catalog-based)

❌ Explicit Exclusions

Not confirmed for these platforms from the available sources, so don’t list as compatible:

• Classic 350 Reborn (J-Series)

• Meteor 350 / Hunter 350

• Classic 350 / Classic 500 UCE

• Continental GT 535 UCE

• 650 Twins (Interceptor / GT 650)

• Himalayan / Scram / Guerrilla

If customer claims fitment: ask for photo of existing washer + sprocket nut area before confirming.

Variants

• Single piece (1N)

What’s in the Box

• 1 × Lock Washer / Tab Washer – 111161/A

Installation Notes

• Install behind the gearbox/front sprocket nut as per the model’s setup.

• Torque nut to spec, then bend the tab into the nut flat to lock.

• Replace if the tab has already been bent/unbent multiple times.

FAQs 

Q1. What is 111161/A used for?
A: It’s a lock/tab washer used to secure the gearbox (front) sprocket nut so it doesn’t loosen.

Q2. Is this for Classic 350 Reborn / Meteor / Hunter?
A: No—don’t assume. This part is referenced in older Bullet sprocket catalogs. Match your existing washer first.

Q3. Why should I replace this washer?
A: Once bent, the locking tab weakens. Reusing can lead to nut loosening and sprocket play.

Q4. Part number shows 111161 without /A—same thing?
A: Many catalogs list it as 111161. Your stock may be stamped/packed as 111161/A depending on sourcing/supersession.