Hex Flange Bolt M8 × 1.25 × 38 (OEM) for Royal Enfield UCE 350/500 & Himalayan 411 (select fitments) – 590544/A

SOLD AS A SET OF 5 PCS 

Royal Enfield 590544/A (search term: 590544) is a genuine OEM Hex Flange Bolt with specification M8 × 1.25 × 38. This is a high-use factory fastener found across multiple Royal Enfield assemblies (for example, exhaust/guards and brake-related sub-assemblies depending on model). Using the correct OEM flange bolt matters because the flange head helps distribute clamping load, and correct thread pitch/length prevents stripped threads, loosening, and repeat failures after service work.

Replace it when the original bolt is rounded, rusted/seized, cross-threaded, stretched, missing after workshop jobs, or when you are rebuilding an assembly and want all fasteners in correct spec. It’s commonly searched as M8 flange bolt, RE exhaust bolt, guard bolt, brake caliper bolt, and by the short search “590544”.

Before you buy: this is a hardware part—confirm M8 × 1.25 thread + 38mm length and match the application by photo/old bolt (or your EPC/VIN list) before dispatch to prevent wrong-size orders.

Key Features

• Genuine OEM Royal Enfield part number 590544/A
• Description: HEX FLANGE BOLT M8 × 1.25 × 38
• Thread: M8 with pitch 1.25; length 38mm
• Flange head distributes load for stable clamping (reduces loosening vs wrong hardware)
• Ideal replacement for rounded/rusted/seized/cross-threaded or missing bolts
• Used in multiple assemblies across select RE models (exhaust/guards/brake sub-assemblies)
• Return-prevention: order by spec + photo-match supported before shipping

Compatibility Table 

Variants

No variants.

FAQs 

Q1 (Fitment): How do I confirm 590544/A is the correct bolt for my bike?
Confirm the fastener spec first: M8 thread, 1.25 pitch, 38mm length, and a flange head. Then match by (a) your EPC/VIN parts list showing 590544/A, or (b) photo-match your old bolt and its location before dispatch.

Q2 (Fitment): My seller says “fits many models” — is that safe?
Hardware bolts can appear on many assemblies but still differ by length/pitch. Treat “fits all” claims as risky—order only when the spec and application match your old bolt or EPC list.

Q3 (Comparison): OEM bolt vs local bolt — what’s the difference?
OEM bolts match the factory thread pitch, length, and flange geometry. Wrong bolts can bottom out, strip threads, loosen, or cause misalignment in brackets/guards.

Q4 (Installation): Any precautions while installing?
Start threads by hand to avoid cross-threading. Use the correct torque for the assembly, and replace any damaged washers/clips as required. For exhaust joints, re-check tightness after a short heat cycle.

Q5 (Symptoms): When should I replace this bolt?
Rounded head, rust/seized threads, cross-threading, missing bolt after service, or repeated loosening at a bracket/guard location.

Q6 (Returns-prevention): What should I send you to verify before shipping?
Send (1) photo of the old bolt next to a scale/ruler, (2) photo of where it’s used, and (3) your bike model + year. This prevents wrong-length/pitch bolt orders.