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Simpson Strong-Tie CPT88Z 184mm x 184mm

Concealed Post Base Pre-Galvanised

Simpson Strong-Tie

Product Code: 78CPT88Z

Model Code: CPT88Z

Brand: Simpson Strong-Tie


From £33.16 inc VAT ( Priced Each )

(Include VAT?)   

Quantity:
 
132 IN STOCK
Sorry! This product is only sold in multiples of 0.
BULK QUANTITY DISCOUNTS:
Qty Price Per Unit Price Per 1 Units
1 - 1 33.7680 £33.77
2+ 33.1560 £33.16
Prices inc VAT based on Each
Order by 2pm for Next Day Delivery (Mon-Fri)
Delivery Icon FREE Standard Delivery on Orders over £100*




STRUCTURAL TIMBER CONNECTORS / CONCEALED POST BASES

Simpson Strong-Tie CPT88Z Concealed Post Base (184mm x 184mm)

The Simpson Strong-Tie CPT88Z is a premium, high-capacity structural connector designed to deliver a completely concealed, clean architectural finish for large, heavy timber columns. Engineered for post sizes from 184x184mm up to 203x203mm, it utilizes an internal steel flitch plate tucked into a pre-cut 5mm slot within the base of the timber. Providing a critical 25mm stand-off isolation height above the ground foundation substrate, it effectively breaks capillary moisture tracking paths to eliminate fungal decay risks. The visible standoff base plate features an additional textured, flat black powder coat finish for high-end aesthetic value, making it perfect for visible structural framing in Service Class 3 outdoor applications.

CRITICAL STRUCTURAL SPECIFICATION: LATERAL RESTRAINT MANDATE

Like all standard stand-off structural supports, the CPT88Z operates strictly as a pinned structural connection. It is engineered exclusively to resist vertical axial loads, tension uplift, and multi-directional horizontal shear forces—it is not designed to withstand bending moments or rotational momentum. To maintain structural integrity, the top of the timber post must be rigidly secured via an approved lateral restraint configuration (such as floor diaphragms, cross-bracing, or braced beam structures).

Click here to read our industrial engineering guide on why lateral restraint is required.


TECHNICAL SPECIFICATION DRAWING & KEY DIMENSIONS

Simpson Strong-Tie CPT88Z concealed post base structural dimension diagram technical drawing
Key Dimension Description CPT88Z Value
A Internal Flitch Plate Width 184 mm
B Internal Flitch Plate Length 184 mm
C Concealed Flitch Insertion Height 145 mm
F Base Ground Standoff Height 25 mm
H Exposed Standoff Base Footprint 114 mm
t1 Flitch Plate Metal Thickness 3.5 mm
t2 Standoff Base Metal Thickness 2.7 mm

TECHNICAL DATA & DESIGN CAPACITIES

Specification Parameter Engineered Values & Materials
Base Footprint Dimensions Compact 114mm footprint matching dressed 184-203mm posts
Stand-Off Ground Clearance 25mm clean architectural isolation zone
Material Composition Pre-galvanised steel plate internally; mechanically galvanised Ø13mm dowels
Corrosion Protection Grade Pre-galvanised & flat black powder coat finish (Optimized for Outdoor Service Class 3 exposures)
Characteristic Capacities R1,k (Compression) = 123.1 kN | R2,k (Uplift) = 16.3 kN | R3,k (Lateral) = 9.1 kN | R4,k = 5.6 kN (C24 Timber)
Fastener Requirements (Timber) Requires 3 No. Ø13mm x 120mm mechanically galvanised dowel pins (included)
Fastener Requirements (Concrete) Requires 2 No. M12 structural concrete resin anchors / fixing bolts

KEY STRUCTURAL PERFORMANCE ADVANTAGES

  • Concealed Architectural Finish: Internal flitch plate slots seamlessly inside the heavy column body, keeping hardware out of sight for pristine large-timber aesthetics.
  • Extreme Load Capacities: Formidable heavy-duty structural resistance ratings defined across R1,k (an impressive 123.1 kN compression) and R2,k (16.3 kN uplift tension).
  • Flat Black Powder Coating: The visible 25mm standoff plate boasts a premium flat black powder coat texture, blending luxury design with heavy protection.
  • Certified Structural Security: Full CE and ETA documentation alignment ensuring absolute engineering performance reliability on high-spec building sites.
Purchase CPT88Z Post Bases & Fixing Kits
Data Sheet
Data Sheet
Declaration of Performance
Declaration of Performance
Environmental Product Declarations (EPD)
Environmental Product Declarations (EPD)


Logistics Excellence

Fast, Reliable Delivery Nationwide

Getting your heavy structural fixings, framing connectors, and site essentials to your workshop or straight to the job site exactly when you need them.

TRUCK

Standard Mainland Delivery

Our reliable baseline shipping network services core industrial hubs and regional sites across the UK mainland via premium tracked courier freight routes.

Shipping Rate £8.95 + VAT
FREE Standard Shipping on orders over £100!

Next Working Day Dispatch

Tight project deadlines. Secure premium prioritised material line allocations. Items are picked, palletised, and routed on premium rapid-transit cargo links.

Order Window Order by 2:00 PM (Mon-Fri)
Fast tracked transit for critical construction paths.
Active construction site framing and rapid transit transport delivery truck keeping builds moving

How We Keep Your Builds Moving

We partner with leading heavy industrial parcel and parcel-freight carriers across the country to maintain real-time tracking from our central warehouse shelves straight to your signature pad.

01.
Instant Hub Sorting: Approved orders pass straight to active pick queues via our localised automated barcode stock framework.
02.
Heavy Component Packing: Structural products are safely stored in industrial reinforced crates or strapped securely to custom pallets to fully safeguard fine threads and anti-corrosion zinc surfaces.
03.
Tailgate On-Site Offloading: Bulk shipments drop cleanly at your structural site boundary line via integrated tail-lift carrier transport systems.

Logistics Scope & Out-Of-Zone Shipments

Standard pricing arrays map explicitly to structural mainland UK postal grids. Supplementary transit routing variables, variable lead times, or specialised carrier adjustments apply across high-altitude or outlying maritime zones:

  • Scottish Highlands & Islands: Postcode structures matching KW, IV, PA, and PH configurations map to premium alternative transit grids. Please review checkout calculations for accurate real-time weights.
  • Northern Ireland, Isle of Man & Outer Channels: Specialised water-crossing logistical paths require clean custom manifesting lines.
  • Heavy Oversized Pallets: Extended multi-ply girder connectors, structural space straps, or high-volume masonry hangers exceeding standard bulk dimensions pass through dedicated heavy haulage grids.
*** NEED SPECIFIC AM DELIVERY TIMES OR SITE COORDINATION ARRANGEMENTS *** If your project features demanding time windows, unique site restrictions, or crane offload coordination, contact our central logistics team directly on 01707 375172 or email your schedule over to finalise arrangements.


 

Our Address

Metro Fixings Ltd
Unit 3 Tewin Court, Tewin Road
Welwyn Garden City, AL7 1AU

Contact Details

Telephone: 01707 375172
Fax: No Fax
Email: sales@metrofixings.co.uk