Strong-Drive® SDWH TIMBER-HEX HDG Screw 

SDWH Timber-Hex HDG – Stringer-to-Round Pile Connection Loads

1. All tabulated values are based on double shear action with the same size and quantity of stringers on each side of the pile.
2. Dimensions and allowable connection loads are based on notched piles that must accommodate the stringers with adequate bearing and no gaps. Notched piles shall not be notched such that more than 50% of the cross section is removed. Unnotched piles may be used providing the width and area of wood between the stringers and the fastener placement geometry is unchanged from the notched conditions.
3. Allowable loads are shown at the wood load duration factor of C_D=1.0. Loads may be increased for load duration per the building code up to a C_D=1.6. Tabulated values must be multiplied by all applicable adjustment factors per the NDS.
4. For in-service moisture content greater than 19%, use C_M = 0.68.
5. For conditions with stringers on one side only, use the longest screw length that does not extend beyond the opposite surface of the pile. Use one quarter of the loads shown for that length screw and stringer condition.
6. Wood piles are SP. Wood stringers may be sawn lumber, glulam, or SCL with minimum SG = 0.55 (or equivalent). For stringer widths at least 1.5" and less than 3.0" thick, use the table values for the conditions with a single 2x stringer on each side of the pile.
7. For 14" diameter piles, use the same screw pattern as for the 12" piles. Loads for 14" diameter piles are based on single shear action.
8. When a screw is loaded simultaneously in more than one direction, the allowable load must be evaluated using the unity equation: (Design Uplift ÷ Allowable Uplift) + (Design F1 ÷ Allowable F1) + (Design F2 ÷ Allowable F2) ≤ 1.0. The three terms in the unity equation represent the possible generated force directions. The number of terms that must be considered for simultaneous loading is the sole discretion of the Designer and depends on the method of calculating wind forces and the utilization of the screws within the structural system.

SDWH Timber-Hex HDG – Allowable Single Shear and Withdrawal Loads

1. All shear loads are based on full penetration into the main member. Full penetration is the screw length minus the side member thickness
2. Allowable loads are shown at the wood load duration factor of C_D=1.0. Loads may be increased for load duration per the building code up to a C_D=1.6. Tabulated values must be multiplied by all applicable adjustment factors per the NDS.
3. For in-service moisture content greater than 19% : withdrawal C_M=0.65; shear C_M=0.70.
4. When using tabulated single shear loads for multiple fasteners, minimum fastener spacing requirements: 8" end distance, 1 1/2" edge distance, 5/8" between staggered rows of fasteners, 4" between non-staggered rows of fasteners and 8" between fasteners in a row, multiply the table values by 0.80.
5. Tabulated loads are for both parallel and perpendicular to grain loading.
6. Maximum withdrawal loads are based on the length of threads in the main member.
7. SDWH271500G is not included in IAPMO-UES ER-192.

See additional Load Tables, Technical Data and Installation Instructions for the Strong-Drive^® SDWH Timber-Hex HDG screw