Socket screwdriver insert Hazet 986-9 for caliper screws, 12.5 mm (1/2") drive

Hazet 986-9 is a socket-style screwdriver insert for brake caliper screws, designed to fit a 12.5 mm (1/2") square drive and provide secure engagement with internal hex fasteners. The tool is manufactured outside the DIN series and is intended for use on specific vehicle models including Mercedes‑Benz M‑Class (Type 164) and R‑Class (Type 251), and BMW X5 (E70) and X6 (E71) model years around 2008–2009. The insert has a knurled grip and a length of 60 mm to allow reliable access to caliper screws during maintenance and repair.

Advantages

The Hazet 986-9 insert offers accurate fitment for internal hex caliper screws with a 9 mm hex profile and a 12.5 mm (1/2") square drive interface, helping to minimise fastener rounding. Its knurled surface improves manual handling when inserting or removing the bit, and the 60 mm length provides reach for recessed screws. The design complies with DIN 7422 and is intended for use with compatible ratchets or torque tools to ensure proper torque application.

Suitable for (tasks / use cases)

• Removal and installation of brake caliper screws on Mercedes‑Benz M‑Class (Type 164) and R‑Class (Type 251)
• Brake caliper screw work on BMW X5 (E70) and X6 (E71) model years circa 2008–2009
• Use with 1/2" (12.5 mm) square‑drive ratchets, torque wrenches or adapters

Key specifications

• Brand: Hazet
• MPN: 986-9
• Drive: 12.5 mm (1/2") square drive
• Bit type: Internal hex (9 mm hex profile)
• Length: 60 mm
• Standards: DIN 7422 (listed)
• EAN: 4000896146734

How to use

Attach the Hazet 986-9 insert to a compatible 1/2" square‑drive ratchet or torque wrench. Align the 9 mm internal hex with the caliper screw head, push the insert fully onto the fastener to ensure engagement, then apply turning force. When tightening to specification, use an appropriate torque tool and follow the vehicle manufacturer's torque settings. After use, store the insert in a tool organiser or protective case to prevent damage.

Usage recommendations

Use only with tools rated for 1/2" (12.5 mm) square drive and follow manufacturer torque specifications for brake caliper screws. Inspect the insert for wear before use and replace if rounded or damaged to avoid fastener damage.