TSN Product: StiffClip® CL

StiffClip^® CL

The StiffClip^® CL series’ unique design allows for the connection of steel studs to the building’s structure by incorporating stiffened legs of a 90^o angle to increase bending strength. StiffClip CL resists vertical, horizontal, and torsional loads. The allowable design load table is based on the use of StiffClipas it is attached to various steel stud wall material thicknesses and yield strengths. Allowable loads consider loads on the clip and screw fasteners to the stud web. Pre-drilled holes for attachments to both deck and stud provide installers with increased efficiency. The designed attachment of StiffClip to the primary structure is dependent upon the base material’s properties (e.g. steel or concrete) and the design configuration. Value Guide holes for connections to stud and deck Stiffeners for additional strength Utilizes only certified, 50ksi steel Reduces material (replaces heavy steel angles) Extensively tested		US Patent #7,533,508
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	Blast & Seismic Design Data

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Tech Sheet |

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Application Image
Installation
Nomenclature/Order Info
Allowable Loads
Material Composition
Anchor Bolt Design

StiffClip CL Application Image

	Place StiffClip CL at bottom of stud. Attach clip to deck with approved anchor. Secure clip to stud with required amount of symmetrically placed #12 screw fasteners. If the (H) Piece is used, secure to clip with approved anchor to deck.
	Printable Installation Instructions

Quantity/Order Information

Designation	Qty/Box	Lbs/Box	Pcs/Skid	Lbs/Skid
CL362/400-68	50	16	4500	1440
CL362/400-118	50	29	4500	2610
CL600-68	50	25	4500	2250
CL600-118	50	41	2250	1980
CL800-68	50	36	2250	1575
CL800-118	50	60	2250	2700
CL (H) Plate	50	24	4500	2430

StiffClip_CL_Dimensions

(H) Plate

Nomenclature

The StiffClip^® CL product group is produced in three thicknesses (68mil, 118mil, and 118mil(H)) and six stud member depths. The StiffClip CL-118(H) utilizes a plate in the 1½” leg. To specify StiffClip CL on drawings, multiply stud depth by 100, followed by the appropriate material thickness, based on strength required.

Example: 6” stud, uplift load of 650lbs.
Designate: StiffClip^® CL600-68.

Stud Thickness Mils (ga)	Fy (yield) Stud (ksi)	CL362/400-68					CL600-68					CL800-68
		4 Screws, Pattern 1					6 Screws, Pattern 3					6 Screws, Pattern 5
		F1 (lbs)	F2 (lbs)	F3 (lbs)	M1 (in-lbs)	Stiffness (in-lbs/rad)	F1 (lbs)	F2 (lbs)	F3 (lbs)	M1 (in-lbs)	Stiffness (in-lbs/rad)	F1 (lbs)	F2 (lbs)	F3 (lbs)	M1 (in-lbs)	Stiffness (in-lbs/rad)
33 (20)	33	191	535	754	1108	38615	286	874	1130	1713	94859	286	976	1077	2479	142580
33 (20)	50	275	773	1089	1601		413	1263	1207	2475		413	1410	1077	2860
43 (18)	33	248	796	1122	1649		373	1301	1207	2549		373	1452	1077	2860
43 (18)	50	359	1150	1151	1804		538	1880	1207	3110		538	2098	1077	2860
54 (16)	33	312	1120	1151	1804		468	1830	1207	3110		468	2042	1077	2860
54 (16)	50	450	1617	1151	1804		676	2510	1207	3110		676	2662	1077	2860
68 (14)	50	567	1917	1151	1804		851	2510	1207	3110		851	2662	1077	2860
97 (12)	50	809	1917	1151	1804		1214	2510	1207	3110		1214	2662	1077	2860
118 (10)	50	856	1917	1151	1804		1284	2510	1207	3110		1284	2662	1077	2860
Max. Allowable Clip Load		1416	1917	1151	1804		1421	2510	1207	3110		1435	2662	1077	2860
Stud Thickness Mils (ga)	Fy (yield) Stud (ksi)	CL362/400-118					CL600-118					CL800-118
		4 Screws, Pattern 1					6 Screws, Pattern 3					6 Screws, Pattern 5
		F1 (lbs)	F2 (lbs)	F3 (lbs)	M1 (in-lbs)	Stiffness (in-lbs/rad)	F1 (lbs)	F2 (lbs)	F3 (lbs)	M1 (in-lbs)	Stiffness (in-lbs/rad)	F1 (lbs)	F2 (lbs)	F3 (lbs)	M1 (in-lbs)	Stiffness (in-lbs/rad)
33 (20)	33	191	535	754	1108	81864	286	874	1130	1713	208333	286	976	1130	2479	399805
33 (20)	50	275	773	1089	1601		413	1263	1633	2475		413	1410	1633	3582
43 (18)	33	248	796	1122	1649		373	1301	1682	2549		373	1452	1682	3689
43 (18)	50	359	1150	1620	2383		538	1880	2225	3683		538	2098	2431	5330
54 (16)	33	312	1120	1577	2319		468	1829	2225	3584		468	2042	2366	5188
54 (16)	50	450	1617	2225	3350		676	2642	2225	5177		676	2950	2666	7493
68 (14)	50	567	2287	2225	3936		851	3736	2225	5702		851	4171	2666	8229
97 (12)	50	809	2411	2225	3936		1214	3939	2225	5702		1214	4398	2666	8229
118 (10)	50	856	2411	2225	3936		1284	3939	2225	5702		1284	4398	2666	8229
Max. Allowable Clip Load		2423	4107	2225	3936		2580	4107	2225	5702		3356	6410	2666	8229
Stud Thickness Mils (ga)	Fy (yield) Stud (ksi)	CL362/400-118 (H)					CL600-118 (H)					CL800-118 (H)
		9 Screws, Pattern 2					10 Screws, Pattern 4					10 Screws, Pattern 6
		F1 (lbs)	F2 (lbs)	F3 (lbs)	M1 (in-lbs)	Stiffness (in-lbs/rad)	F1 (lbs)	F2 (lbs)	F3 (lbs)	M1 (in-lbs)	Stiffness (in-lbs/rad)	F1 (lbs)	F2 (lbs)	F3 (lbs)	M1 (in-lbs)	Stiffness (in-lbs/rad)
33 (20)	33	286	980	1696	1653	116721	381	1481	1884	3140	414654	381	1664	1884	4710	485135
33 (20)	50	413	1415	2450	2388		550	2139	2722	4537		550	2404	2722	6805
43 (18)	33	373	1458	2524	2460		497	2204	2804	4673		497	2476	2804	7010
43 (18)	50	538	2107	3646	3554		718	3184	4051	6222		718	3577	4051	10128
54 (16)	33	468	2050	3548	3458		624	3099	3943	6222		624	3481	3943	9856
54 (16)	50	676	2961	5126	4996		901	4476	5695	6222		901	5029	5695	11143
68 (14)	50	851	4187	5713	6716		1134	6329	6007	6222		1134	7110	7446	11143
97 (12)	50	1214	4415	5713	6716		1618	6455	6007	6222		1618	7497	7446	11143
118 (10)	50	1284	4415	5713	6716		1712	6455	6007	6222		1712	7497	7446	11143
Max. Allowable Clip Load		2598	4978	5713	6716		4158	6455	6007	6222		4816	8274	7446	11143

Allowable load tables incorporate eccentric loading of fasteners. Values with welded connection may increase.

When determining the allowable load of fasteners securing StiffClip to the base material and clip to stud, consider the following:
- Fasten within ¾” from the angle heel (centerline of the 1½” leg), using pre-drilled holes if desired
- Center hole is .563” in diameter for ½" anchor
- Middle guide holes are .313” in diameter
- Outer guide holes are .172” in diameter
- Guide holes are in place for fastener installation efficiency. Number of fasteners determined by designer
- Attachment to stud is made with #12 screws, symmetrically place

Loads listed reflect force in a single direction. When multiple loads react on the connection, it is the responsibility of the designer to check the interaction of forces.
All guide holes may not require fasteners. Fastener amount determined by the designer. Screw fasteners should be symmetrically placed in guide holes. Refer to screw pattern diagrams above for placement.
Allowable loads have not been increased for wind, seismic, or other factors, and are based on use of #12 screws.
Torsional effects are considered on screw group for F2 & F3 allowable loads. It is assumed that half of the torsional moment is taken by the connection to the structure and half is taken by the connection to the stud.
M1 Loads are reported as Max. Load/Factor of Safety. Loads must be limited by serviceability Load taken as Stiffness times the serviceability limit in radians.

Screw Pattern

CL Screw Patterns

Load Direction

StiffClip CL-Load Direction

Steel:

68mil: ASTM A1003/A1003M Structural Grade 50 (340) Type H, ST50H (ST340H):
50ksi (340MPa) minimum yield strength, 65ksi (450MPa) minimum tensile strength, 68mil minimum thickness (14 gauge, 0.0713” design thickness) with ASTM A653/A653M G90 (Z275) hot dipped galvanized coating.

118mil: ASTM A1003/A1003M Structural Grade 50 (340) Type H, ST50H (ST340H): 50ksi (340MPa) minimum yield strength, 65ksi (450MPa) minimum tensile strength, 118mil minimum thickness (10 gauge, 0.1242” design thickness) with ASTM A653/A653M G90 (Z275) hot dipped galvanized coating.

“H” Plate:

ASTM A27/A27M Grade 65-35 (450-240): 35ksi (240MPa) minimum yield strength, 65ksi (450MPa) minimum tensile strength, ½” minimum thickness with ASTM B633 Zinc Plating.

The attachment of StiffClip to the primary structure may be made with a PAF, screw/bolt anchors or weld and is dependent upon the base material (steel or concrete) and the design configuration.

The following equation for tension force in the anchor is derived using the assumed bearing stress distribution shown in the fi gure to the right. This assumed stress distribution provides a conservative anchor force approximation.

CL Anchor Bolt Design