Royal Enfield 650 Twin Engine Cover Hex Socket Bolt M6×40 – 575900/B

Genuine Royal Enfield 575900/B is the factory HEX SOCKET HEAD CAP SCREW used extensively across the engine-cover assemblies of catalogue-confirmed Royal Enfield 650 Twin motorcycles.

Part Identification

Short Hook

Replace missing, rounded or incorrect 650 Twin engine-cover hardware with genuine Royal Enfield 575900/B, the OEM M6×40 socket-head bolt used across clutch, magneto and related engine-cover assemblies.

Detailed Product Description

Royal Enfield 575900/B is a genuine engine-cover fastening screw used repeatedly across the 648cc Twin engine family.

Current genuine-parts data describes 575900/B as HEX SOCKET HEAD CAP SCREW (M6X1). The earlier 575900/A revision is documented as HEX SOCKET M6 × 40_10.9, establishing the M6×40 size and grade-10.9 specification associated with this fastener family.

In Interceptor 650 and Continental GT 650 engine-cover EPCs, base number 575900 is used in large quantity across the clutch, magneto and associated cover assemblies. Later 650 Twin cover catalogues also list the same base fastener.

What This Product Is

• Genuine Royal Enfield hex socket head cap screw.
• Engine-cover fastening bolt.
• M6 × 40 mm fastener family.
• Associated with grade 10.9 specification in the earlier documented revision.
• Used across multiple 650 Twin engine-cover assemblies.
• Sold as one individual bolt unless stated otherwise.

What This Product Is Not

• Not a complete engine-cover bolt kit.
• Not the M6×50 bolt 575901.
• Not the M6×35 bolt 575388.
• Not the clutch-cover gasket.
• Not the magneto-cover gasket.
• Not a generic hardware-store bolt substitute.
• Not automatically correct for every M6 location on a Royal Enfield engine.

Key Features

• Genuine Royal Enfield OEM hardware.
• Correct fastener family where 575900/B is specified.
• M6×40 socket-head format.
• Used repeatedly across 650 Twin engine-cover assemblies.
• Exact SKU identification prevents mixing it with nearby M6×35, M6×50 and flanged bolts.

Buyer Search Names / Internal Search Keywords

575900/B, 575900B, 575900, 575900/A, Royal Enfield M6x40 bolt, engine cover bolt, clutch cover bolt, magneto cover bolt, alternator cover bolt, crankcase cover bolt, Allen bolt, socket head cap screw, Interceptor 650 engine bolt, Continental GT 650 engine cover bolt, Super Meteor 650 engine cover bolt, Shotgun 650 engine bolt.

Confirmed Compatibility

Fitment Not Confirmed / Check Before Ordering

Not Compatible / Do Not Order For

Part Number / Supersession Notes

Current genuine-parts references list:

• 575900/A – HEX SOCKET M6 × 40_10.9
• 575900/B – HEX SOCKET HEAD CAP SCREW (M6X1)

Use 575900/B as the current Shopify SKU and Google Shopping MPN. Do not claim every /A and /B packet is automatically interchangeable unless the genuine EPC or supersession system confirms it for the specific motorcycle/location.

Similar Parts Comparison

When Should This Be Replaced?

• Hex socket is rounded or damaged.
• Threads are stretched, stripped or corroded.
• Bolt is bent.
• Incorrect-length fastener was previously installed.
• Engine-cover work requires restoration to correct OEM hardware.
• Workshop procedure specifies bolt replacement.

Recommended Related Parts to Check

• 575901/A – M6×50 engine-cover bolt.
• 575388 – M6×35 engine-cover bolt.
• 575608 – clutch-cover gasket.
• 575609 – magneto-cover gasket.
• 575619 – breather-cover gasket.
• Thread condition in the corresponding engine cover / crankcase.

What’s in the Box

1 × Genuine Royal Enfield 575900/B Hex Socket Head Cap Screw

Important: EPC quantities such as 18, 26 or other totals refer to the number used across a complete engine-cover assembly. This product listing is for one individual bolt unless a multipack is explicitly selected.

Installation Notes

1. Confirm the exact EPC position specifies 575900 / 575900/B.
2. Compare bolt length and head style with the removed original.
3. Clean threaded holes before installation.
4. Start the bolt by hand to avoid cross-threading.
5. Do not substitute a longer bolt because it may bottom out or damage the crankcase.
6. Tighten in the correct engine-cover sequence and to the applicable Royal Enfield workshop torque specification.

Return-Prevention Note / Before You Buy

1. Match the full SKU 575900/B.
2. Confirm you require an M6×40 socket-head engine-cover bolt.
3. Do not confuse it with 575901, 575388, 591577 or H6902012.
4. Check whether you need one bolt or multiple bolts for a complete engine-cover job.
5. Do not order only by thread diameter; length and head style matter.

Correctly supplied spare parts are not returnable or exchangeable because of incorrect selection, mechanic recommendation, quantity mistake, wrong bolt length or change of mind. Orders cannot be cancelled once placed. Eligible wrong-item or damaged-item claims require applicable proof and a complete unboxing video under store policy.

FAQs

What is 575900/B?
It is a genuine Royal Enfield hex socket head cap screw used across 650 Twin engine-cover assemblies.

What size is it?
The 575900 fastener family is documented as M6 × 40 mm; the earlier /A revision explicitly records M6×40 and grade 10.9.

Does it fit Interceptor 650?
Yes, where the EPC specifies 575900.

Does it fit Continental GT 650?
Yes, where specified in the engine-cover assembly.

Does it fit Super Meteor 650 and Shotgun 650?
Yes, checked cover EPCs also list base 575900.

Is quantity 1 a full engine bolt set?
No. Quantity 1 means one individual bolt.

Why does the EPC show 26?
That quantity refers to the total usage of this fastener across the relevant full cover assembly, not the contents of one retail unit.

SEO Tags

Royal Enfield, Genuine Royal Enfield Parts, 575900/B, 575900B, 575900, 575900/A, HEX SOCKET HEAD CAP SCREW, M6x40 Bolt, M6 x 40 Bolt, Engine Cover Bolt, Clutch Cover Bolt, Magneto Cover Bolt, Breather Cover Bolt, Allen Bolt, Socket Head Bolt, Grade 10.9 Bolt, Interceptor 650, INT650, Continental GT 650, GT650, Super Meteor 650, Shotgun 650, 650 Twin, Engine Fasteners, OEM Spares

Image Filename Suggestions

• royal-enfield-575900-b-m6x40-engine-cover-bolt.jpg
• royal-enfield-650-twin-clutch-magneto-cover-bolt-575900-b.jpg
• interceptor-gt650-engine-cover-allen-bolt-575900-b.jpg

Image Alt Text

Genuine Royal Enfield 575900/B M6×40 hex socket engine-cover bolt for Interceptor 650, Continental GT 650, Super Meteor 650 and Shotgun 650

Google Shopping Notes

Competitor Gap Analysis

Typical seller listings say only “M6×40 Bolt” or “Hex Socket Head Cap Screw.” This V3 listing improves buyer clarity by identifying the 650 Twin engine-cover use, distinguishing M6×40 from nearby M6×35 and M6×50 hardware, explaining EPC quantity versus retail quantity, documenting the /A and /B revisions, and preventing generic-bolt substitution errors.