SRAM Flat Mount Disc Caliper Bracket Bolts - 27mm | Stainless Steel

SRAM Flat Mount Disc Caliper Bracket Bolts 27mm Stainless Steel SRAM

SRAM Flat Mount Disc Caliper Bracket Bolts - 27mm | Stainless Steel

SRAM Flat Mount Disc Caliper Bracket Bolts - 27mm | Stainless Steel

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Which SRAM flat mount caliper bolt length do I need — 27mm?

The 27mm Flat Mount stainless steel caliper bracket bolts are the correct fasteners for direct flat mount brake installations where the caliper threads straight into the frame or fork's native mount without any intervening adapter hardware. This is the standard bolt length for most road and gravel frames with a built-in Flat Mount interface — when the rotor size matches what the frame's mount is positioned for, no adapter is needed, and the 27mm bolt has the right thread engagement for safe, secure caliper installation. Stainless steel construction resists the corrosion and thread seizing that standard steel bolts develop in aluminum caliper mounts after regular wet-weather riding, where salt and moisture turn routine bolt removal into a stripped-thread situation over time. Drive is T25 Torx for proper torque application.

These are sold as replacement or spare hardware, not bundled with a caliper. If you are building a disc brake road or gravel bike with a native flat mount interface, replacing seized or stripped bolts, or maintaining your service bench stock, these are the correct stainless fasteners at the 27mm direct-mount length. If your setup uses a bracket adapter to accommodate a larger rotor on a smaller mount, you need the 37mm version instead. Bolt length matters on flat mount brakes — too short won't torque properly, too long bottoms before clamping, so verify your application before ordering.

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Specifications

  • Length: 27mm
  • Material: Stainless steel
  • Drive: T25 Torx
  • Mount Type: Flat Mount direct (no adapter)
  • Sold As: Replacement/spare hardware (not sold with caliper)

FAQ

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

If the caliper mounts directly to your frame or fork's native flat mount interface without any bracket adapter, use the 27mm bolts. If your installation uses a flat mount bracket adapter to accommodate a larger rotor on a smaller frame mount, use the 37mm bolts instead — the adapter adds enough thickness to require the longer fastener for safe thread engagement.

Do these work with non-SRAM flat mount calipers?

Flat mount is an industry-standard interface, not proprietary to SRAM. These bolts use standard M5 T25 Torx threads consistent with the flat mount specification, so they are compatible with any flat mount caliper from any brand that uses standard flat mount hardware dimensions. Always confirm thread pitch and diameter before installing in safety-critical brake mounts.

Why does stainless steel matter here?

These bolts thread into aluminum caliper mounts, and standard steel corrodes over time in that contact zone, especially on bikes that see rain, mud, or hose-down washes. When steel corrodes in aluminum threads, the bolts seize and removal strips the mount or snaps the fastener. Stainless steel resists this process and keeps the caliper removable for future service.

Best For

Road and gravel builds with a native direct flat mount interface and no bracket adapter, or as replacement stainless hardware for existing mounts where original bolts have corroded or seized.

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