Connection Calculator
Design Method
Allowable Stress Design (ASD)
Load & Resistance Factor Design (LRFD)
Connection Type
Lateral loading
Withdrawal loading
Fastener Type
Bolt
Lag Screw
Wood Screw
Nail
Loading Scenario
Single Shear - Wood Main Member
Single Shear - Concrete Main Member
Double Shear - Wood Main Member
Double Shear - Steel Main Member
Main Member Type
Glulam Alaska Cedar
Glulam Douglas Fir-Larch
Glulam Douglas Fir (South)
Glulam Hem-Fir
Glulam Hem-Fir (North)
Glulam Softwood Species
Glulam Southern Pine
Glulam Spruce-Pine-Fir
Glulam Spruce-Pine-Fir (South)
Glulam Western Woods
Alaska Cedar
Alaska Hemlock
Alaska Spruce
Alaska Yellow Cedar
Aspen
Balsam Fir
Beech-Birch-Hickory
Coast Sitka Spruce
Cottonwood
Douglas Fir-Larch
Douglas Fir-Larch (North)
Douglas Fir-South
Eastern Hemlock
Eastern Hemlock-Balsam Fir
Eastern Hemlock-Tamarack
Eastern Hemlock-Tamarack (North)
Eastern Softwoods
Eastern Spruce
Eastern White Pine
Engelmann Spruce-Lodgepole Pine
Hem-Fir
Hem-Fir (North)
Mixed Maple
Mixed Oak
Mixed Southern Pine
Mountain Hemlock
Northern Pine
Northern Red Oak
Northern Species
Northern White Cedar
Ponderosa Pine
Red Maple
Red Oak
Red Pine
Redwood (close grain)
Redwood (open grain)
Sitka Spruce
Southern Pine
Spruce-Pine-Fir
Spruce-Pine-Fir (South)
Western Cedars
Western Cedars (North)
Western Hemlock
Western Hemlock (North)
Western White Pine
Western Woods
White Oak
Yellow Poplar
Main Member Thickness
0.75 in.
1.5 in.
1.75 in.
2.5 in.
3.5 in.
5.5 in.
7.5 in.
9.5 in.
11.5 in.
-- Other (in inches) --
Main Member: Angle of Load to Grain
Side Member Type
Steel
Oriented Strand Board (OSB)
Plywood (Structural 1 grade)
Plywood (other grades)
Alaska Cedar
Alaska Hemlock
Alaska Spruce
Alaska Yellow Cedar
Aspen
Balsam Fir
Beech-Birch-Hickory
Coast Sitka Spruce
Cottonwood
Douglas Fir-Larch
Douglas Fir-Larch (North)
Douglas Fir-South
Eastern Hemlock
Eastern Hemlock-Balsam Fir
Eastern Hemlock-Tamarack
Eastern Hemlock-Tamarack (North)
Eastern Softwoods
Eastern Spruce
Eastern White Pine
Engelmann Spruce-Lodgepole Pine
Hem-Fir
Hem-Fir (North)
Mixed Maple
Mixed Oak
Mixed Southern Pine
Mountain Hemlock
Northern Pine
Northern Red Oak
Northern Species
Northern White Cedar
Ponderosa Pine
Red Maple
Red Oak
Red Pine
Redwood (open grain)
Redwood (close grain)
Sitka Spruce
Southern Pine
Spruce-Pine-Fir
Spruce-Pine-Fir (South)
Western Cedars
Western Cedars (North)
Western Hemlock
Western Hemlock (North)
Western White Pine
Western Woods
White Oak
Yellow Poplar
Side Member Thickness
1/4"
3/8"
1/2"
Side Member: Angle of Load to Grain
Fastener Diameter
1/4 in.
5/16 in.
3/8 in.
1/2 in.
5/8 in.
3/4 in.
7/8 in.
1 in.
Load Duration Factor
C_D = 0.9
C_D = 1.0
C_D = 1.15
C_D = 1.25
C_D = 1.33
C_D = 1.6
Wet Service Factor
C_M = 1.0
C_M = 0.7
C_M = 0.4
Temperature Factor
C_t = 1.0
C_t = 0.8
C_t = 0.7
C_t = 0.5
Please select a thicker main member or a shorter wood screw.
