HSKP™ Heavy Seated Knife Plate Hanger
Preserve the look of mass timber beams while meeting high-demand loads with the HSKP. Offering the highest load ratings yet in our line of concealed beam hangers, the HSKP is ICC-ES code listed and tested for inter-story drift. The HSKP installs in the factory with Strong-Drive® SDCF Timber-CF structural screws, saving valuable time on the jobsite. It also offers generous fit-up tolerance for easy beam placement. Manufactured in the USA, the HSKP is readily available through our nationwide distribution network. Like all our products, it’s supported by our expert service teams.
- High capacity
- Code listed in ICC-ES ESR 2552
- ASTM E119 1- and 2-hour hour fire tests pending; contact Simpson Strong-Tie
- Factory installation of connector reduces on-site labor
- Quick field connection of beam to supporting member reduces crane cycle-time
- Inclined screw hole feature reduces the overall screw count compared to horizontal screws
- Options for wood-to-wood and wood-to-steel concealed connection
- Manufactured and stocked in the USA
- Recommended for use at beam-to-beam or beam-to-column connections in any Seismic Design Category; see L-C-HSKPDRIFT for more information
- Back and Knife Plate — 3 gauge; Bearing Plate — 1/2"
- Exception: HSKP5.75x19.5 and HSKP5.75x19.5-W knife plate — 3/8"
- HSKP/HSKP-W — Simpson Strong-Tie gray paint
- HSKP available in HDG and powder coat
- SDCF Timber-CF screw — Yellow Zinc
- CJTPL steel dowel — mechanically galvanized
Prior to connection of the carried beam to the HSKP hanger, carried member shall be routed to allow for the concealed installation of the HSKP and predrilled for the installation of the optional steel dowel (reference L-C-HSKPROUT). The designer shall determine the desired beam-end rout depth and bottom-of-beam rout depth for the desired concealed installation and potential fire considerations. When considering fire requirements, maximum allowable gaps and intumescent requirements shall be determined by the designer.
Note: When installing SDCF screws for the HSKP connection, do not exceed recommended seating torque values (reference L‑F‑MTINSTALL).
- HSKP Factory Installation to Column
- Drive the required horizontal SDCF screws at the top and the bottom of the hanger first. See Table 1 for the proper screw sizes. This will secure the hanger to the column to facilitate smooth installation of the inclined screws.
- Drive the required SDCF inclined screws through the patent pending tab feature. Screws are inclined upward 45° and rotated inward 15°.
- Factory Installation of Bearing Reinforcement Screws Into Beam
- Install the SDCF22858 bearing reinforcement screws through the bottom of the carried member as required per the HSKP load table (see the image gallery's illustrations for installation locations). To ensure SDCF heads are normal to the face of the bottom of the carried member, predrill 3/16" maximum diameter x 2" minimum depth pilot holes prior to installation.
- Factory Installation of Dowel
- Install 1/2" diameter x 4 3/4" long dowel into 1/2” diameter predrilled hole in the carried member. Note that, while the installation of the dowel is only a requirement when considering joint rotation due to inter-story drift, the installation of the dowel can aid installation of the carried beam by guiding the carried member into position as the dowel slides into the HSKP knife plate slot. Dowel location must be centered about knife plate kerf cut. When considering inter-story drift, the vertical location of the steel dowel is to be located mid-height of the beam-floor assembly. If inter-story drift need not be considered, the final vertical location of the dowel may be anywhere within the knife plate slot provided a 1/4" minimum gap is allowed between the bottom of the dowel and the bottom of the slot to allow shrinkage of the carried beam.
- Completing the Field Installation
- After the beam has been placed into position, adjust the location of the carried member as needed to allow for the maximum desired gap between the carried and supporting member, install the beam seat screws into the bottom of the carried member through the two countersunk holes in the bottom of the HSKP bearing plate. See Table 1 for the proper screw size.
- For fully concealed installations requiring a bottom filler block, the connection is to be determined by the building designer.
Product Information Table
(1) HSKP5.75X14.5 5 Connector
(1) HSKP5.75X14.5Connector (1) CJTPL 1/2" Dia. Steel Dowel, (16) SDCF27614, (6) SDCF22858
(1) HSKP5.75X14.5-W Connector (1) CJTPL 1/2" Dia. Steel Dowel, (2) SDCF27614
(1) HSKP5.75X17 Connector
(1) HSKP5.75X17 Connector (1) CJTPL 1/2" Dia. Steel Dowel, (20) SDCF27614, (8) SDCF22858
(1) HSKP5.75X17-W Connector (1) CJTPL 1/2" Dia. Steel Dowel, (2) SDCF27614, (2) SDCF22858
(1) HSKP5.75X19.5 Connector
(1) HSKP5.75X19.5 Connector (1) CJTPL 1/2" Dia. Steel Dowel, (24) SDCF27614, (10) SDCF22858
(1) HSKP5.75X19.5-W Connector (1) CJTPL 1/2" Dia. Steel Dowel, (2) SDCF27614, (4) SDCF22858
Table 1: HSKP Wood-Wood Allowable Loads
|Model No.||Fasteners (SDCF)||Allowable Loads (lbf)|
|Floor Depth Above Carried Beam (in)||Carrying Column/Beam||Uplift (160)||Download (100/125)||F2 (160)||Uplift (160)||Download (100/125)||F2 (160)|
|Beam Seat||Bearing Reinf.||Bottom Horizontal||Inclined||Top Horizontal||Column||Beam||Column||Beam|
|HSKP5.75x14.5||(2) 27614||—||(6) 27614||(8) 27614||(6) 22858||3,190||22,415||21,260||3,640||2410||17,700||17,815||3,050|
|(2) 27614||—||(6) 27400||(8) 27614||(6) 22858||20,115||20,040||16,190||16,230|
|HSKP5.75x17||(2) 27614||(2) 22858||(6) 27614||(12) 27614||(6) 22858||3,190||26,800||26,090||3,640||2410||22,080||21,935||3,050|
|(2) 27614||(2) 22858||(6) 27400||(12) 27614||(6) 22858||24,505||24,140||20,570||20,350|
|HSKP5.75x19.5||(2) 27614||(4) 22858||(6) 27614||(16) 27614||(6) 22858||3,190||31,930||30,915||3,640||2410||26,460||26,055||3,050|
|(2) 27614||(4) 22858||(6) 27400||(16) 27614||(6) 22858||28,960||29,700||24,950||24,470|
- Fasteners: SDCF27400 and SDCF27614 = 0.390" O.D. by 4" long and 6 1/4" long Strong-Drive SDCF TIMBER-CF screw, respectively. SDCF22858 = 0.315" O.D. by 8 5/8" long Strong-Drive SDCF TIMBER-CF screw.
- Uplift and F2 loads have been increased for wind or seismic with no further increase allowed.
- For HSKP installations on opposite faces (back-to-back) of the same supporting member, the minimum depth of the supporting member is 12 1/4" when using installing the SDCF27614 (6-1/4" long) bottom horizontal screws and 8 3/4" when installing the SDCF27400 (4" long) bottom horizontal screws.
Table 2: HSKP Wood-Steel Allowable Loads
|Model No.||Carried Beam Fasteners (SDCF)||Supporting Steel Member Weld Size, Length||Allowable Loads (lbf)|
|Beam Seat||Bearing Reinf.||Uplift (160)||Download (100/125)||F2 (160)||Uplift (160)||Download (100/125)||F2 (160)|
|HSKP5.75x14.5-W||(2) 27614||—||1/4" Continuous||3,190||22,630||22,630||3,640||2,410||19,600||19,600||3,050|
|HSKP5.75x17-W||(2) 27614||(2) 22858||1/4" Continuous||3,190||26,800||26,800||3,640||2,410||23,215||23,215||3,050|
|HSKP5.75x19.5-W||(2) 27614||(4) 22858||1/4" Continuous||3,190||32,935||32,935||3,640||2,410||27,455||27,455||3,050|
- Fasteners: SDCF27614 = 0.390" O.D. by 6 1/4" long Strong-Drive SDCF TIMBER-CF screw. SDCF22858 = 0.315" O.D. by 8 5/8" long Strong-Drive SDCF TIMBER-CF screw.
- Uplift and F2 loads have been increased for wind or seismic with no further increase allowed.
- Loads assume E-70XX weld material.
- Caution: Follow proper welding procedures and safety precautions. Welding should be in accordance with AWS standards.
- Welds must conform to the current AWS D1.1 structural welding code for steel.
- This connection involves welding 3 gauge and 1/2" steel to heavy structural steel. It should only be performed by skilled, qualified welders.
Table 3: HSKP Minimum Carried Beam Sizes & Edge Distances
|Model No.||Connector Dimensions||Minimum Carried Beam Sizes (in.)||Minimum Edge Distances (in.)|
|5 3/4||14 1/2||9||7||2 1/2||8||6 3/4||15 1/2||1/2||n/a||1|
|5 3/4||17||9||8||2 1/2||8||6 3/4||18||1/2||n/a||1|
|16 1/2||17 1/2|
|5 3/4||19 1/2||9||9 1/4||2 3/8||8||6 3/4||20 1/2||1/2||n/a||1|
- Side edge distances for supporting vertical columns must meet or exceed the eside table values for the carried beam. Top edge distances for supporting member 1 1/4" minimum.
- Table etop values assume full coverage for the top of the carried beam (i.e., roof or floor members attached to the top of the carried beam and providing complete continuous cover to the top of the carried beam). For conditions with the top of the carried beam being exposed to fire, increase the minimum top edge distance to eside for the installed condition.
- Bw-min and Bl-min are the minimum bearing width and length, respectively, required each side of the knife plate to achieve allowable downloads listed in Table 1 (see the illustration in the image gallery).
- Minimum Ws considering only fastener edge distance does not consider F2 loads. When F2 loads must be considered, minimum Ws = 7 1/4" and minimum eside = 1".
- When ebottom + 1/2" bearing plate thickness exceeds the lesser of 1/10 of the depth of the member or 3", consider notch reinforcement with fully threaded screws. See TEB-F-SDCFTENS for design guidance.
Table 4: Allowable Carried Beam Min/Max Depths Considering Inter-story Drift
|Model No.||Floor Depth Above Carried Beam (in.)||Carried Beam Depth Ds Range (in.)|
|ebottom = 0||ebottom = 1 1/2||ebottom = 3||ebottom = 3 1/2|
|6 5/8 to 7 1/2||16 1/2||18||18||21||19 1/2||24||19 1/2||25 1/2|
|3 3/8 to 4 1/2||16 1/2||21||18||24||19 1/2||27||19 1/2||28 1/2|
|No Floor||16 1/2||25 1/2||18||28 1/2||22 1/2||31 1/2||22 1/2||33|
|6 5/8 to 7 1/8||18||24||19 1/2||27||21||30||22 1/2||30|
|4 1/8 to 5||18||25 1/2||19 1/2||28 1/2||21||31 1/2||22 1/2||33|
|No Floor||18||30||21||33||24||36||25 1/2||37 1/2|
|6 1/8 to 7 1/8||21||28 1/2||22 1/2||31 1/2||24||34 1/2||24||36|
|4 1/8 to 4 1/2||21||31 1/2||22 1/2||34 1/2||24||37 1/2||24||37 1/2|
|No Floor||21||36||24||39||27||42||28 1/2||42|
- When installed in the carried beam, 1/2" diameter dowel to be located vertically mid-height within the floor-beam assembly. The total floor-beam assembly depth is the combined depth of the supported floor member and the carried beam. For assemblies not including CLT floor above, the total assembly depth is the depth of the carried beam alone (see illustration).
- Ds-min and Ds-max values shown in the table only define minimum and maximum beam depths when considering joint rotation due to story drift but do not consider beam size requirements based on design loads. When joint rotation due to story drift need not be considered, refer to Table 3 for minimum allowable beams dimensions based on minimum fasteners edge distances.
- Table Ds-min and Ds-max depths values are rounded up and down, respectively, to the nearest 1 1/2" for nominal GLB depths.
Code Reports & Compliance