Description
Product Overview
The MERCURY alloy steel hex bolt is engineered for demanding automotive environments. Crafted from high‑grade alloy steel and finished in stainless steel, the bolt resists corrosion and wear. It features a round head for easy torque application and a distinctive purple coating for quick visual identification. With a 1/2‑13 coarse right‑hand thread (Thread Class 1B) and Grade 2 hardness, this standard‑grade fastener delivers reliable clamping force in engine assemblies and other critical components.
Usage
Designed for engine replacement and general automotive repairs, this bolt fits a wide range of OEM and aftermarket applications. Mechanics installing cylinder heads, timing covers, or accessory brackets will appreciate the precise thread pitch and robust material. DIY enthusiasts can also use it for custom projects where a strong, corrosion‑resistant fastener is required. 
Why Choose Us
MERCURY guarantees consistent quality through rigorous manufacturing standards. Each bolt undergoes hardness testing and dimensional inspection to meet industry specifications. The combination of alloy steel strength, stainless exterior, and a unique color code reduces the risk of misplacement and ensures long‑term durability, making it a trusted choice for professional workshops and home garages alike.
Key Features
- Alloy steel construction with stainless exterior for superior corrosion resistance
- Round head design provides optimal torque transfer and easy handling
- Coarse 1/2‑13 right‑hand thread (Class 1B) ensures a secure, vibration‑resistant fit
- Purple coating offers quick visual identification during installation and service
- Grade 2 hardness delivers reliable strength for demanding engine applications
FAQ
What applications is this bolt suitable for?
The bolt is ideal for engine component replacement, accessory mounting, and general automotive fastening where a 1/2‑13 thread is required.
Is the purple coating purely cosmetic?
No, the coating serves as a durable, corrosion‑resistant finish that also helps technicians locate the bolt quickly during service.
Can this bolt be used in high‑temperature environments?
Yes, the alloy steel core maintains its strength at elevated temperatures typical of engine bays, while the stainless finish protects against heat‑induced oxidation.
Does the bolt meet OEM specifications?
It conforms to standard automotive thread specifications (1/2‑13, Class 1B) and is suitable for many OEM applications.
How many pieces are included per package?
Each package contains a single, individually packaged bolt for easy inventory management.





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