Reinz Cylinder Head Bolt Set is a cylinder head bolt set with M12 threads and a 172mm length matched to ARL engines. Such specification brings reassurance when tackling head gaskets and full engine rebuilds. Are the female star head and uprated 10-gauge quality the right choice for PD engine maintenance?
⚡ At a Glance
- • Fastening Strength: High clamping reliability under repeated service loads
- • Best for: Mechanics and DIY enthusiasts working on ARL and PD engines
- • Not ideal for: Applications needing non-standard thread sizes or custom-length bolts
M12-thread cylinder head bolt set specified at 172mm length for engines coded ARL. Female star head and uprated 10-gauge construction aim to improve fastening reliability during head installation.
Secure torque transfer - with female star head design
Female star head uses an internal star engagement that spreads the turning force across the bolt head, reducing the chance of cam-out. The geometry promotes consistent torque application when using the correct star socket.
Controlled engagement gives more predictable tightening during head reassembly, reducing the risk of damaged heads or rounded fasteners.
Accurate fit for ARL engines - with M12 thread and 172mm length
M12 thread size and the specified 172mm length align with ARL engine requirements listed in the product details. Correct thread dimension and reach ensure proper engagement through the head into the block.
Proper fitment reduces the need for aftermarket adapters or machining and helps ensure correct clamping force for the gasket surface.
Improved durability under service - thanks to uprated 10-gauge quality
User feedback identifies an uprated 10-gauge build, indicating a heavier gauge construction compared with standard sets. Thicker gauge material resists stretch and fatigue over repeated torque cycles.
Greater resilience to stretch means fewer replacements and more reliable torque retention across multiple engine rebuilds.
✨ The 4 Key Reasons for Reinz Cylinder Head Bolt Set
- Female star head - Controlled socket engagement reduces risk of slippage during tightening
- M12 thread - Standard thread size ensures consistent thread engagement in ARL heads
- 172mm length - Sufficient reach to clamp head and penetrate to correct depth
- Uprated 10-gauge construction - Heavier gauge material improves resistance to stretch and fatigue
📋 Technical Details at a Glance
- Category: Automotive Parts and Accessories
- Brand: Reinz
- Product Type: Cylinder Head Bolt Set
- Bolt Head-/Nut Design: Female Star
- Thread Size: M12
❓ Frequently Asked Questions
Q: Are these bolts compatible with ARL engines?
A: Yes, the product description lists Engine Code ARL and user reviews confirm compatibility with PD engines.
Q: What thread size do the bolts use?
A: Thread size is M12, as specified in the product details.
Q: What head type is required for installation?
A: Female star head is specified, so an internal star socket or key is needed for torqueing the bolts.
🏆 Our Verdict
Suitable for workshop technicians and competent DIYers working on ARL or PD engines who need a direct-fit bolt set. The combination of M12 threading, 172mm length and a female star head, together with uprated 10-gauge construction, targets reliable clamping during head reassembly. Durable components aim to reduce the need for early replacement, offering sensible long-term value for engine rebuilds.
