UNDER THE HOOD
Royal Enfield 591578/A Hex Flange Bolt – M6×35 mm 8.8 ZnFe (White) OEM Bolt for Classic / Bullet / Thunderbird UCE Models
Royal Enfield 591578/A Hex Flange Bolt – M6×35 mm 8.8 ZnFe (White) OEM Bolt for Classic / Bullet / Thunderbird UCE Models
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Please order only after confirming the part number, model, variant, year, side, connector type and compatibility. All orders are non-cancellable once placed. Correctly shipped spare parts are not eligible for return, exchange or refund due to wrong selection, wrong diagnosis, fitment mismatch, mechanic recommendation or change of mind. Electrical/electronic items are additionally non-returnable once opened, installed, plugged in, tested or used. Wrong item, damaged item or missing item claims require a complete unboxing video within 24 hours. Read full Return & Warranty Policy
NOW SOLD AS A PACK OF 10 PCS (FROM 18 JAN 2025)
Secure your Royal Enfield with the 591578/A Hex Flange Bolt, the factory-standard fastener used across UCE-era export models. With an M6 × 35 mm thread, flange head, and Grade 8.8 steel with Zinc-Iron white plating, this bolt delivers exceptional strength and resistance to rust and corrosion.
This OEM bolt is used in multiple assemblies including frame mounting, mudguard screws, seat fixtures, exhaust bolts, and more. Properly engineered to exact factory specs, it ensures accurate torque, fit, and durability.
Compatible with Classic 350, Classic 500 EFI, Bullet 350/500, and Thunderbird 350/500 UCE export variants. Sold individually, this bolt is ideal for maintenance, restoration, or replacement of worn hardware. Compatible OEM fit, globally shipped with return support.
✔️ Features & Benefits
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Genuine OEM part: Royal Enfield 591578/A — exact factory fit
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High tensile strength: Grade 8.8 steel—built for vibration resistance
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Corrosion-resistant coating: ZnFe white plating for long-lasting finish
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Wide fitment range: UCE-era Classic, Bullet, and Thunderbird models (export variants)
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Precise OEM spec: M6 × 35 thread, flanged hex head—uses exact torque settings
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Direct replacement: No modifications needed; bolt-on replacement
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Reliable sourcing: Verified via official catalogs and trusted suppliers
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Low-cost maintenance: Perfect for keeping your bike factory stock and secure
🧩 Variant Options
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10 X Hex Flange Bolt – Royal Enfield 591578/A (M6×35 mm, Grade 8.8, ZnFe white)
📋 Specification Table
| Attribute | Details |
|---|---|
| Part Number | 591578/A |
| Thread Size | M6 × 1.0 (35 mm length) |
| Material / Grade | Grade 8.8 high tensile steel |
| Finish | Zinc-Iron (ZnFe) white coating |
| Head Type | Flanged hexagon head |
| Compatible Models | Classic 350, Classic 500 EFI, Bullet 350/500, Thunderbird 350/500 (export UCE models) |
❓ Frequently Asked Questions
Q1: Which models use 591578/A bolt?
✅ Fits UCE-era export versions of Classic 350/500, Bullet 350/500, Thunderbird 350/500—used for frame, mudguard, seat, exhaust attachments.
Q2: What does ZnFe white coating mean?
🧴 It's a zinc-iron electrocoat plating—providing enhanced rust protection over standard zinc.
Q3: Can this replace any M6×35 bolt in my frame?
✅ Yes—where OEM spec matches (flange type, length, grade). Always verify torque rating is correct.
Q4: Should I replace more than one bolt at a time?
🟢 Ideal to replace bolts in the same assembly together (e.g. seat mount, exhaust bracket) when one is worn or stripped.
Q5: Is this bolt metric?
✅ Yes. Metric thread M6 × 1.0, 35 mm long, flange head, 8.8 grade steel.
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Verify Fitment on Official Brand Portals
Verify Fitment on Official Brand Portals
For selected genuine spare parts, you can cross-check the part number on the official brand portals before ordering.
Royal Enfield Official Spares Portal
Hero MotoCorp Official eCatalogue
