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Calcimator

Timber Connection Calculator

Design bolted timber connections per NDS: calculate reference design values, group action factor, and connection capacity.

Inputs

mm
mm

NDS Supplement Table 12A: DF-L G=0.50; Southern Pine G=0.55; SPF G=0.42; Hem-Fir G=0.43

bolts
(1=parallel, 2=perp.)
mm

NDS Β§12.3: min spacing parallel to grain 4D; perp. to grain 3D; end distance 4D (full) or 2.5D (reduced)

Results

Total Connection Capacity

5,801.38 kN

Spacing Adequate?

1 (1=yes, 0=no)

Reference Design Value (Z)1,495.2 kN
Adjusted Capacity per Bolt1,450.34 kN
Group Action Factor (Cg)0.97
How to Use This Calculator
  1. Select the wood species and connection type (nails, bolts, screws, or timber rivets).
  2. Enter the fastener diameter, length, and number of shear planes.
  3. Input the applied lateral and withdrawal loads in lbs.
  4. Review the Design Value per Fastener and the Number of Fasteners Required.
  5. Apply adjustment factors for moisture content, temperature, and load duration per NDS.
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