Spectre Flex Plate Bolts for GM Automatic Transmissions, 7/16-20 x 11/16 (8‑Pack) — Grade 8, Black Oxide

Spectre Performance Flex Plate Bolts are a set of eight grade‑8, 7/16‑20 x 11/16 black oxide bolts with security lock washers engineered for GM automatic transmission flex plate installations.

Designed by Spectre, a racing‑rooted brand known for precision and durability, this 8‑pack of flex plate bolts replaces worn or missing fasteners on GM vehicles with automatic transmissions. Each bolt meets grade‑8 strength standards and comes finished in black oxide to resist light surface corrosion while maintaining a professional appearance. Security lock washers are included to reduce the chance of loosening under vibration, and Spectre backs the set with a lifetime warranty for long‑term peace of mind.

What makes these bolts suitable for GM automatic transmissions?

These bolts are sized and specified to match common GM flex plate-to-torque converter interfaces used on many automatic transmissions. The 7/16‑20 thread pitch and 11/16" length provide proper engagement without bottoming out, while grade‑8 construction offers high tensile strength for drivetrain applications.

• Thread size: 7/16‑20, standard for many GM flex plate bolts
• Length: 11/16" for correct clamping and clearance
• Grade 8 alloy steel for increased shear and tensile capacity
• Black oxide finish for a low‑glare, corrosion‑resistant surface

How do the included security lock washers help?

Security lock washers are designed to improve fastener retention when exposed to engine and drivetrain vibration. They add a mechanical locking action that reduces the likelihood of bolts backing out over time compared with flat washers alone.

• Each bolt ships with a matched security lock washer for reliable clamping
• Lock washers bite or deform slightly to resist loosening from vibration
• Helps maintain torque settings during vehicle operation

Are these bolts corrosion‑resistant and finished for appearance?

The black oxide finish on these grade‑8 bolts offers surface oxidation protection and a sleek, low‑reflective look that suits exposed drivetrain hardware. While black oxide is not a heavy plating, it does reduce flash rust and keeps components looking uniform.

• Black oxide finish reduces surface rust and glare
• Compatible with common engine compartment anti‑corrosion practices
• Maintains a professional appearance on exposed flex plate hardware

What warranty and quality assurances come with this pack?

Spectre supports these flex plate bolts with a lifetime warranty, reflecting confidence in materials and workmanship. The bolts are manufactured to industry grade‑8 specifications to ensure consistent strength and fit for intended GM applications.

• Lifetime warranty from Spectre for manufacturing defects
• Grade 8 specification for predictable mechanical performance
• Sold as an 8‑pack—sufficient to service most flex plate bolt patterns

Who is this for: These Spectre Performance Flex Plate Bolts are intended for mechanics, restoration hobbyists, and DIY enthusiasts working on GM vehicles with automatic transmissions who need reliable, high‑strength replacement bolts. They suit anyone replacing stripped, rusted, or missing fasteners on flex plates, and are particularly useful for builders seeking a durable, race‑inspired solution that matches OEM and performance standards.