Technical Specifications

Before installing wedge anchors, certain technical specifications should be considered to make certain these concrete fasteners are installed correctly and safely. Thunderstud anchors come in a variety of anchor diameters, lengths, and threads. These anchors are available in three materials: stainless steel, zinc plated and hot-dipped galvanized. Minimum embedment, torque, and embedment depth vary to meet numerous construction needs. A concrete wedge anchor's ultimate holding value is also important to consider before installation.

ULTIMATE HOLDING VALUES –CONCRETE*

						2000 PSI Concrete		4000 PSI Concrete
Anchor Dia.	Anchor Length	Thread Length	Min. Embed	Torque Ft./ Lbs.	Embed Depth	Tension Lbs.	Shear Lbs.	Tension Lbs.	Shear Lbs.
1/4	1-3/4	5/8	1-1/8	5-10	1-1/8	1170	1443	1771	1813
	2-1/4	1-1/8			1-3/4	1841	1443	2408	1813
	3	1-7/8			2-3/4	1975	1443	2748	1813
	3-1/4	2-1/8
3/8	2-1/4	3/4	1-1/2	25-30	1-1/2	1631	4318	3636	5121
	2-3/4	1-1/4			3	3229	4318	5653	5121
	3	1-1/2			5	4075	4318	6328	5121
	3-3/4	2-1/4
	5	3-1/2
	6-1/2	1-1/8
1/2	2-3/4	7/8	2-1/4	50-60	2-1/4	3999	7419	6714	9377
	3-3/4	1-7/8			4	6336	7419	8942	9377
	4-1/4	2-1/4			6	6902	7419	10175	9377
	5-1/2	3-5/8
	7	3-7/8
	8-1/2	3-7/8
	10	3-7/8
	12	1-1/4
5/8	3-1/2	1-1/4	2-3/4	75-90	3-3/4	4999	8264	8747	12928
	4-1/2	2-1/4			5	8854	8264	15590	12928
	5	2-3/4			7	9381	8264	16710	12928
	6	3-3/4
	7	3-7/8
	8-1/2	3-7/8
	10	3-7/8
	12	3-7/8
3/4	4-1/4	1-1/2	3-1/4	150-175	3-1/4	6638	12504	11314	17050
	4-3/4	2-1/8			6	10084	12504	18708	17050
	5-1/2	2-7/8			2	11170	12504	19805	17050
	6-1/4	3-3/4
	7	3-7/8
	8-1/2	3-7/8
	10	3-7/8
	12	3-7/8
7/8	6	3-1/4	3-7/8	200-250	3-7/8	8392	18250	16354	20234
	8	3-7/8			5-3/4	12064	18250	18250	20234
	10	2-1/4			8-3/4	12784	18250	16850	20234
	12	2-1/4
1	6	2-7/8	4-1/2	250-300	4-1/2	9773	23617	18250	27605
	9	3-7/8			7-1/2	11890	23617	26726	27605
	12	3-7/8			10	15590	23617	30491	27605
1-1/4	9	3-1/4	5-1/2	400-450	5-1/2	17550	32275	22971	42690
	12	3-1/4			10	27893	32275	34788	42690

*Values shown are average ultimate values and are offered only as a guide and are not guaranteed.  A safety factor of 4:1 or 25% is generally accepted as a safe working load.  Reference should be made to applicable codes for the specific working ratio.  *Tested by ATEC in accordance with ASTM E488-90 and ICBO   Minimum embedment for satisfactory anchor performance is 4-1/2 bolt diameters.  Deeper embedment will yield higher tension and shear capacity.

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