The Royal Enfield 170352/C Domed Cap Nut is a genuine OEM rear-suspension fastener for compatible older Royal Enfield motorcycles.

NOW SOLD AS A SET OF 6 PCS FULL PACKET 

It secures the rear shock absorber at the applicable upper or lower mounting point while covering the exposed end of the shock-mount thread with the original rounded factory-style profile.

Royal Enfield Classic 350 and Classic 500 service information identifies part 170352 at the rear shock absorber’s top and bottom mounting points, with four used around the motorcycle.

What This Product Is

• Genuine Royal Enfield rear shock mounting nut
• Closed-end domed cap-nut design
• Current genuine revision 170352/C
• Replacement for earlier 170352 variants
• Used at compatible rear shock upper and lower mounts
• Historical catalogue thread specification: 3/8-inch BSF
• One nut supplied per ordered quantity

The Bullet 500 parts catalogue describes the earlier 170352/1 version as a 3/8-inch BSF domed nut, quantity four. That earlier number is now replaced by 170352/C.

Quantity Required

Many compatible twin-shock Royal Enfield motorcycles use four nuts:

• 1 × Left shock upper mount
• 1 × Left shock lower mount
• 1 × Right shock upper mount
• 1 × Right shock lower mount

This listing supplies one nut only. Select quantity four when replacing the complete visible set.

What This Product Is Not

This product is not:

• A set of four
• A rear shock absorber
• A shock mounting bolt
• A flat washer
• A spring lock washer
• A generic metric cap nut
• A universal nut for every twin-shock motorcycle
• Confirmed for modern J-Series, 450 or 650 Royal Enfield motorcycles

Key Features

• Genuine Royal Enfield OEM fastener
• Latest supplied /C revision
• Factory-style domed appearance
• Closed end covers the exposed mounting thread
• Suitable for suspension repair and restoration
• Replaces a missing, corroded or damaged original nut
• Compatible where the parts catalogue specifies 170352-series numbers

Confirmed Compatibility

Genuine part-assignment data lists the earlier 170352/1 nut on Bullet 500 Euro 3/4 and several Classic 500 variants and confirms that it is replaced by 170352/C.

Older Model Applications — Verify Before Ordering

A retired-model catalogue associates the 170352/C and 170352/A dome-cap-nut family with older Lightning, Machismo and Thunderbird applications.

Not Compatible / Do Not Order For

Do not automatically order this nut for:

• Classic 350 Reborn
• Bullet 350 J-Series
• Meteor 350
• Hunter 350
• Goan Classic 350
• Himalayan 411
• Scram 411
• Himalayan 450
• Guerrilla 450
• Continental GT 535
• Interceptor 650
• Continental GT 650
• Super Meteor 650
• Shotgun 650
• Bear 650
• Classic 650

These newer motorcycles use different metric rear-suspension mounting systems.

Part Number and Supersession Notes

Current genuine-parts pricing records show the /A, /B and /1 versions being replaced by 170352/C.

This means your existing 170352/B listing should be updated to the current SKU 170352/C, rather than creating a separate duplicate product.

Technical Details

Related Rear Shock Mounting Parts

A Classic 500 rear-shock diagram shows 170352 alongside the applicable mounting bolts, flat washers and spring lock washers, with four domed nuts normally required.

What You Will Receive

1 × Genuine Royal Enfield Rear Shock Domed Cap Nut – 170352/C

The following are not included:

• Remaining three nuts
• Rear shock absorber
• Mounting bolt or stud
• Plain washer
• Spring lock washer
• Shock bush
• Complete suspension-hardware kit

Installation Note

• Support the motorcycle securely before loosening rear-shock hardware.
• Confirm the existing thread before installation.
• Inspect the bolt or stud for damaged or corroded threads.
• Replace damaged washers and lock washers.
• Begin threading the nut by hand.
• Do not force or cross-thread it.
• Tighten using a correctly sized socket on the hexagonal flats.
• Do not grip or strike the rounded dome.
• Use the torque specification for the exact motorcycle.
• Recheck all four mounting locations after installation.

Classic 350/500 service information specifies 40 N·m for the applicable rear-shock domed nuts. Different models may specify another value, so the exact motorcycle workshop manual should take priority.

Return-Prevention Note

This listing supplies one 170352/C nut, not a complete four-piece set.

Before ordering, confirm:

• Motorcycle model
• Production year
• Rear shock mounting location
• Existing 170352-series part number
• 3/8-inch BSF thread
• Quantity required

Do not order this nut for a modern metric suspension system solely because the motorcycle has two rear shock absorbers.

Buyer-Focused FAQs

Is 170352/C a genuine Royal Enfield part?

Yes. It is the current genuine Royal Enfield domed cap nut replacing earlier 170352 revisions.

Does the listing include one nut or four?

One nut. Many compatible motorcycles require four.

Does it fit Classic 350 UCE?

Yes. Classic 350 service information identifies 170352 at the rear shock absorber top and bottom mounting points.

Does it fit Classic 500 EFI?

Yes. Classic 500 applications are confirmed in model-specific parts and genuine assignment records.

Does it fit Bullet 500 Euro 3 and Euro 4?

Yes. Both models are listed for the earlier 170352/1, which has been replaced by 170352/C.

Does it fit Electra or Thunderbird?

Several older Electra and Thunderbird applications use the 170352 nut family, but the existing thread and mounting hardware should be checked before ordering.

Is 170352/C the replacement for 170352/B?

Yes. Current genuine records show 170352/C replacing 170352/B.

Is it a metric nut?

Historical Royal Enfield catalogues describe it as a 3/8-inch BSF domed nut.

Does it include the bolt and washer?

No. Those components are sold separately.