Keystone Compac III Hewnstone combines style, performance and cost-saving versatility into one wall system. It’s favoured by architects, engineers and contractors worldwide for its function in both small and large-scale projects. Using the proven Keystone pin connection system, Keystone Compac® III Hewnstone is the perfect solution for gravity walls up to 4 feet in height and large-scale projects over 60’h. Corner and coping units are also available.
Maximum Versatility and Performance Due to:
A design that results in decreased unit weight, effectively reducing shipping costs while maintaining structural integrity.
A design that allows for various positive connections with reinforcement to build engineered walls over 60 feet (18.2m) tall.
Increased vertical drainage through face units.
Easier Installation Due to:
A block shape that allows for tight radius curves and vertical core alignment.
A shorter tail design that allows for easier handling in the field.
A triangular shaped pin receiving hole that allows for installer-friendly construction adjustments.
Vertical or battered setback construction options.
Sizes (H X W X D)
Standard 8 x 18 x 12 in 203 x 457 x 305 mm
Coping 3.94 x 17.72 x 11.81 in 100 x 450 x 300 mm
Corner 8 x 18 x 9 in 203 x 457.2 x 228.6 mm
Fiberglass Alignment Pins 0.5 x 5.25 in 13 x 133 mm
Graphite – BC & Alberta Only
COLOURS SHOWN MAY VARY
Every effort has been made to ensure accuracy in the colour representations found on this website. However, due to the natural characteristics of concrete, the manufacturing process and on-screen display, actual colours in the final product may vary from that shown.
Unit Size MM
Unit Size IN
Unit Face Area M2
Unit Face Area Sq Ft
Unit Weight LB
No. Of Horizontal Layers
Pallet Face Area M2
Pallet Face Area Sq Ft
Pallet Weight LB
Pallet Row Units
Pallet Row Face Area M2
Pallet Row Face Area Sq Ft
Keystone Compac III Hewnstone Standard
H X W X D
203 x 457 x 305
8 x 18 x 12
Keystone Compac III Hewnstone Corner
H X W X D
203 x 457.2x 228.6
8 x 18 x 9
H X W X D
100x 450 x 300
3.94 x 17.72 x 11.81
21.95 lin. m
72 lin. ft
10.97 lin. m
36 lin. ft
Fiberglass Alignment Pins
H X W X D
13 x 133
0.5 x 5.25
Item No. Standard
Item No. Corner
Item No. Coping
Item No. fiberglass pins
Retaining / Support / Freestanding Walls
Sold in full pallets only. A $35.00 returnable pallet fee will be charged to any bundle of Keystone Compac III – Hewnstone.
Unit of Measure
The Unit of Measure for Keystone Compac III is Each.
Contact your local Barkman sales representative for information on special or custom order products in terms of minimum production cycles required.
Use 2 fiberglass pins per block to connect. For near vertical batter, place pins in front hole location. For 8.5 degree batter, place pins in back hole location. For 4 degree batter, alternate pin location starting with back pin location on first course, front location on second course and alternating on consecutive layers. Alignment pins sold separately. For information on wall heights, consult the product installation guide and technical specifications. Check your local building codes and consult a professional engineer when required.