SRAM Flat Mount Disc Caliper Bracket Bolts - 37mm | Stainless Steel

SRAM Bracket Mounting Bolts Titanium T25 - 32mm SRAM

SRAM Flat Mount Disc Caliper Bracket Bolts - 37mm | Stainless Steel

SRAM Flat Mount Disc Caliper Bracket Bolts - 37mm | Stainless Steel

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Which SRAM flat mount caliper bolt length do I need: 37mm?

The 37mm Flat Mount stainless steel caliper bracket bolts are the correct fasteners for flat mount brake installations that use an offset bracket adapter between the frame or fork and the caliper. When a frame's native Flat Mount placement is sized for a smaller rotor and you add an adapter to run a larger one, the additional thickness of the adapter requires the longer 37mm bolt to reach the mount threads with enough engagement to torque safely. Stainless steel resists the corrosion and thread seizing that standard steel bolts develop after a season of wet riding, a genuine concern when these bolts thread into aluminum caliper mounts on bikes that see regular rain, salt spray, or hose-down cleanings. Drive is T25 Torx for proper torque application without rounding under installation loads.

These are sold as replacement or spare hardware, not as a kit with a caliper. If you are building up a brake system that uses a flat mount bracket adapter, replacing seized or stripped existing bolts, or stocking your shop bench, these are the correct fasteners. If your frame or fork uses a direct native flat mount without an offset adapter, you likely need the 27mm version instead. Check your frame spec and adapter thickness before ordering. The wrong bolt length either won't engage enough threads or bottoms out before clamping the caliper properly, neither of which is acceptable on a disc brake.

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Specifications

  • Length: 37mm
  • Material: Stainless steel
  • Drive: T25 Torx
  • Mount Type: Flat Mount (with bracket adapter)
  • Sold As: Replacement/spare hardware (not sold with caliper)

FAQ

How do I know if I need 37mm or 27mm bolts?

If your installation uses a flat mount bracket adapter between the frame or fork and the caliper, use the 37mm bolts. The adapter adds thickness that requires the longer bolt to reach the mount threads with adequate engagement. If the caliper mounts directly to the frame or fork's native flat mount interface without any adapter, use the 27mm bolts instead.

Are these SRAM-specific or will they work with other flat mount calipers?

Flat mount is an industry-standard interface, not proprietary to SRAM. These bolts use standard T25 Torx M5 threads and will work with any flat mount compatible caliper that uses standard flat mount bolt specs. That said, always verify thread pitch and bolt diameter before installing third-party hardware in safety-critical brake mounts.

Why stainless steel instead of standard steel?

Standard steel bolts in aluminum flat mount threads corrode and seize over time, especially on bikes ridden in wet conditions. Stainless steel resists corrosion and is much less likely to seize into aluminum threads, which makes future caliper removal significantly less likely to strip or damage the mount.

Best For

Road and gravel disc brake builds using a flat mount bracket adapter that requires 37mm fasteners, or as replacement hardware for existing brackets where original bolts have corroded or stripped.

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