Menu

We independently review everything we recommend. When you buy through our links, we may earn a commission. Learn more ›

Best GuoYomm Engine Bolts

GuoYomm Engine Bolts offer premium 12.9 grade alloy steel kits with hex socket cap screws and nuts in M6 x 50-80mm lengths, ideal for secure engine repairs and maintenance.

1 product

Select a Product

Click on a product from the list to view its details.

PRIME

ProductSearch.org score rating is a scoring system developed by our experts. The score is from 0 to 10 based on the data collected by the ProductSearch.org tool. This score doesn't impact from any manufacturer or sales agent websites. We encourage you to write a review of your experiences with these products. Learn more »
Last update on . Affiliate links, prices, images, product titles, and highlights from Amazon Product Advertising API.

Pros

Cons

Key Features

User Reviews

Your review will be visible after approval.

Loading reviews...
GuoYomm 50PCS M6 Hex Socket Head Cap Screws Bolts Nuts Kit 50-80mm 12.9 Alloy Steel Black Oxide

GuoYomm's 50-piece M6 hex socket cap screws kit includes 5 each of 50mm, 60mm, 70mm, 80mm fully threaded bolts and 30 matching nuts, crafted from high-strength 12.9 grade alloy steel with black oxide finish. Perfect for mechanics, DIYers, and assemblers tackling precision machinery, furniture, bikes, or automotive projects.

  • Ultra-durable 12.9 grade alloy steel withstands heavy loads and ensures long-term reliability
  • Black oxide finish provides superior corrosion and moisture resistance for indoor/outdoor use
  • Four versatile lengths (50-80mm) plus 30 nuts cover diverse fastening needs in one kit
  • Precision 5mm Allen hex drive allows secure, torque-heavy installation without stripping
  • Fully threaded design grips firmly in wood, metal, or plastic for vibration-resistant holds

Exceptional strength from 12.9 alloy steel. Corrosion-resistant black oxide coating. Convenient multi-size assortment with nuts.

Small parts pose choking hazard; keep from children. Limited to M6 diameter and specific lengths. Black oxide finish may fade under extreme abrasion.

Welcome to our GuoYomm Engine Bolts category, where you'll find top-tier fastening solutions designed specifically for automotive engine applications. These bolts are essential for securing critical engine components, ensuring safety, performance, and longevity in your vehicle. Whether you're tackling a full engine rebuild or routine maintenance, GuoYomm delivers the precision and strength mechanics demand.

Why Choose GuoYomm Engine Bolts?

GuoYomm stands out in the crowded Engine Bolts market for its commitment to superior materials and manufacturing standards. Known for reliability in replacement parts, GuoYomm bolts feature 12.9 grade alloy steel, offering exceptional tensile strength to withstand extreme engine conditions like high vibrations, heat, and torque. The black oxide finish provides corrosion resistance, making them suitable for both street and performance builds. As part of our broader Engines & Engine Parts selection, these bolts help you source everything needed for comprehensive repairs without compromising quality.

Featured GuoYomm Product: 50PCS M6 Hex Socket Head Cap Screws Bolts Nuts Kit

Our standout offering is the comprehensive 50-piece kit including M6 bolts in 50mm, 60mm, 70mm, and 80mm lengths, paired with matching nuts. These fully threaded, metric Allen drive bolts are engineered for precise fitment in a variety of engine assemblies. The hex socket design allows for high-torque application using standard tools, reducing stripping risks during installation.

  • Material: 12.9 grade alloy steel for maximum strength (up to 1200 MPa tensile strength)
  • Finish: Black oxide for rust protection and reduced friction
  • Drive Type: Hex socket (Allen) for secure, tool-friendly installation
  • Threading: Fully threaded for versatile gripping in blind or through-hole applications
  • Kit Contents: Mixed lengths (50PCS total) plus nuts for immediate use

This kit's versatility makes it ideal for DIY enthusiasts and professionals alike, covering multiple fastener needs in one purchase.

Key Features to Consider When Shopping GuoYomm Engine Bolts

When selecting engine bolts, prioritize grade, thread type, and compatibility. GuoYomm's 12.9 grade exceeds most OEM specs, providing peace of mind for high-stress areas like cylinder heads, manifolds, and mounts. Look for black oxide finishes to combat moisture in engine bays, and hex socket heads for easy access in tight spaces. Compared to alternatives like Fel-Pro Engine Bolts, GuoYomm offers better value through bulk kits, while matching the durability of Dorman Products Engine Bolts.

Always match bolt length to your application's stack height, shorter 50mm for mounts, longer 80mm for deeper assemblies. Fully threaded designs like these excel in adjustable setups, ensuring a rock-solid hold.

Common Use Cases for GuoYomm Engine Bolts

These bolts shine in automotive repairs within the Replacement Parts ecosystem. Install them on intake manifolds, exhaust headers, valve covers, or timing chain covers. They're popular for custom engine swaps, where precise metric sizing aligns with import vehicles. In performance tuning, the high-grade steel handles boosted pressures without yielding. For fleet maintenance or restoration projects, the kit's variety speeds up workflows, integrating seamlessly with other Engine Parts.

Frequently Asked Questions

What makes GuoYomm Engine Bolts superior to competitors?

GuoYomm uses 12.9 grade alloy steel with black oxide plating, outperforming lower-grade options in torque retention and corrosion resistance. Brands like GOOACC Engine Bolts may suffice for light duty, but GuoYomm excels in demanding engine environments.

Which length should I choose from the kit?

Select based on your assembly: 50mm for shallow mounts, 60-70mm for manifolds, and 80mm for thicker stacks. The mixed kit lets you test fitments without extra orders.

Are GuoYomm bolts compatible with my vehicle?

M6 metric sizing fits most modern imports and many domestics. Verify thread pitch and length against OEM specs for cylinder heads or accessories.

What is the warranty on GuoYomm products?

GuoYomm offers a satisfaction guarantee; contact their support for replacements on manufacturing defects. Their reputation for quality minimizes issues.

GuoYomm vs. other brands like TAISS?

While TAISS Engine Bolts provide solid options, GuoYomm's bulk kits and 12.9 grade offer broader utility and strength for serious builds.