Get Product Advice
Check Compatibility Before Ordering
Before you buy, confirm:
- Bolt diameter and length
- Bolt grade
- Required finish
- Components being connected
- Hole dimensions
- Nut and washer requirements
- Quantity needed for the system
Different guardrail bolts perform different functions and should not be treated as interchangeable.
Shop Mushroom Head Bolts Online
A mushroom head bolt has a broad, rounded head that provides a smooth external profile. Within compatible Guardrail Direct systems, these bolts are used to connect W-beam rail to a guardrail post or attach selected handrail uprights.
The current range includes:
- M16 × 50 mm grade 4.6 HDG mushroom head bolts
- M16 × 50 mm safety-yellow mushroom head bolts
- M12 × 75 mm grade 4.6 HDG cup-head bolts for compatible handrail uprights
The M16 × 50 mm product is listed as a bolt-and-nut set. Check each product page for its finish, grade, supplied components, bag quantity and current availability.
Mushroom Head Bolt Applications
Connecting Guardrail to Posts
The M16 × 50 mm mushroom head bolt is used to connect compatible guardrails to Guardrail Direct posts. This connection helps secure the W-beam rail in its specified position within the barrier system.
Galvanised bolts complement standard HDG components, while yellow-finished bolts provide a visually consistent option for safety-yellow guardrail installations.
Attaching Handrail Uprights
The M12 × 75 mm cup-head or mushroom-head bolt is listed for connecting compatible handrail uprights to the back of Guardrail Direct posts. This fitting may be required in systems combining W-beam guardrail with an upper handrail.
Always confirm the required bolt against the components and system design before ordering.
Understanding Different Guardrail Bolts
A complete installation may use several types of fasteners:
|
Bolt type
|
Typical function
|
|
Mushroom head bolt
|
Connects compatible guardrail rail to a post
|
|
M12 cup-head bolt
|
Connects a compatible handrail upright to a guardrail post
|
|
Splice bolts
|
Join overlapping sections of W-beam guardrail
|
|
HDG hex-head bolts
|
Connect compatible steel or Abraham spacer blocks to posts
|
|
TruBolts
|
Anchor compatible surface-mounted baseplates to suitable concrete
|
Selecting the wrong fastener may prevent components from fitting correctly or affect the finished system. Use the project documentation and product specifications to identify the required guardrail fixing bolts.
Choosing the Correct Guardrail Fixing
Follow these steps when selecting bolts:
- Identify the two components being connected.
- Check their hole dimensions and connection details.
- Confirm the specified bolt diameter, length and grade.
- Match the finish to the surrounding guardrail system.
- Determine whether nuts, washers or other parts are included.
- Calculate the quantity required for every connection.
- Seek advice if the product specification is unclear.
Correct selection and installation are essential for a reliable, long-lasting guardrail fixing.
