SUP04 HDP Urethane Bottom Rail Support Block – 6″ W × 6″ L × 2″ H
- SKU:
- SUP04
- MPN:
- SUP04
- Condition:
- New
- Availability:
- Typically Ships within 2-3 weeks from Order Date
- Width:
- 6.00 (in)
- Height:
- 2.00 (in)
- Depth:
- 6.00 (in)
- Shipping:
- Calculated at Checkout
Description
SUP04 Bottom Rail Support Block
SUP04 sits beneath the bottom railing, usually near the middle of the span, to help keep the rail from bowing or arching over time. Longer spans may need additional support blocks. Made from high-density polyurethane and supplied double primed for painting.

Product illustration. Confirm dimensions and rail pairing against the manufacturer drawing.
SUP04 at a glance
- Profile
- Plain rectangular support block
- Material
- High-density polyurethane
- Finish
- Double primed; paint after installation
- Use
- Beneath the bottom rail
- Rail pairing
- RAL2102 & RAL2105
- Size
- 6″ W × 6″ L × 2″ H
- Production
- Made to order
Plan your order & delivery
Made for your project
SUP04 is made to order and cannot be returned. Confirm the rail model, block size and quantity before purchasing.
Small parts
A support block on its own typically ships UPS.
With a long rail
An order that includes a long rail ships LTL freight.
If it goes by freight
Freight needs a verified commercial address that a 52-foot trailer can pull into. A house with a business in it does not qualify. If the carrier calls the address a residence, a $275 fee is added. You receive a confirmation letter so you can correct the address or pay the extra freight.
How long
The order goes to the Spectis plant in Manitoba the same day. Shipping from Canada typically takes two to three weeks.
Placement & fit
Set the block beneath the bottom rail, between the rail and the surface below it. A block is commonly placed near the middle of a railing span; longer spans may require additional blocks to help prevent bowing over time.
The manufacturer drawing identifies RAL2102 & RAL2105 for SUP04. Check the 6″ W × 6″ L × 2″ H dimensions against the rail footprint and the available clearance. Confirm the number and spacing of blocks for your particular run.
Installation & finishing
- Check the block size and placement with your rail system before fastening.
- Use ADH100 adhesive on every bedding joint and butt joint.
- Follow the Spectis handrail instructions for fastening and assembly. Adhesive, nails and screws are sold separately.
- The block ships double primed. Paint after installation following the manufacturer's finishing instructions.
Drawings & resources
Check the dimensions and rail pairing before ordering. PDFs open in a separate tab.
SUP04 FAQs
What does this support block do?
SUP04 sits beneath the bottom railing, usually near the middle of the span, to help keep the rail from bowing or arching over time. Longer spans may need additional support blocks.
Where should I place the blocks?
Place support blocks between the bottom rail and the surface below it, typically near midspan. Longer runs may need more than one block. Confirm the number and spacing for your rail system and span before installation.
What size is SUP04?
6 inches wide × 6 inches long × 2 inches high. The manufacturer drawing identifies RAL2102 & RAL2105. Check the drawing and the clearance beneath your bottom rail before ordering.
What is it made of?
High-density polyurethane (HDP urethane). It ships double primed and should be painted after installation.
Which adhesive should I use?
Use ADH100 adhesive on every bedding joint and butt joint, following the Spectis handrail installation instructions. Adhesive, nails and screws are sold separately.
Can I return it?
No. It is made for your order. Confirm the size, rail pairing and quantity before purchasing.
How does it ship?
A small part on its own typically ships UPS. An order with a long rail ships LTL freight. Freight needs a verified commercial address accessible to a 52-foot trailer. A house with a business in it does not qualify. If the carrier classifies the address as residential, a $275 fee is added and a confirmation letter is sent so you can correct the address or pay the extra freight. Orders go to the Spectis plant in Manitoba the same day; shipping from Canada typically takes two to three weeks.
What if it arrives damaged?
Inspect it at delivery and notify the carrier right away. Email sales@spectis.us the same day. If Spectis is not notified within 24 hours, the items cannot qualify for a claim.
Need help checking the fit?
Have your rail model, span and part number SUP04 ready. Weekdays, 8 a.m. to 6 p.m. Eastern.
Builders, designers, and customers: if Spectis products or the installation steps are modified, you agree to indemnify, defend, and hold harmless Veritas Products LLC, veritasproducts.com, and spectis.us from any claimed loss or damage, regardless of other instructions.
Spectis catalogue