• Channels are manufactured by the cold roll forming process which produces cross sections of uniform dimensions within tolerances established by the Metal Framing Manufacturer's Association, Metal Framing Standards Publication No. MFMA-4.

• Steel used in the manufacture of channels conforms to the ASTM specifications under the Specifications tab below.
• Design is based on AISI S100-2016 "Specification for the Design of Cold-Formed Steel Structural Members." Maximum bending stress used in design is 25,000 pounds per square inch (PSI). This is based upon a virgin steel minimum yield stress of 33,000 psi cold worked to an average yield stress of 42,000 psi.
• Welds meet the performance requirements of section 4 of AISI S100-2016 "Specification for the design of Cold-Formed Steel Structural Members." All multiple sections of two or more single channels are resistance spot-welded approximately 2" to 3" (51mm to 76mm) on center.

Channel Specifications
Material	Material Code	Current ASTM Designation	ASTM Description
Hot Rolled: Channel	Use Finish Code*	A 1011SS GR33	Hot rolled carbon steel sheet and strip, structural quality.
Cold Rolled: Channel		A 1008SS GR33, A 1008	Cold rolled carbon sheet steel.
Pregalvanized: Channel		A 653 SS GR33	Steel sheet zinc-coated by hot dip process at mill, structural quality.
Stainless Steel: Channel	ST304	A 240 TYPE 304	Heat resisting chromium and chromium-nickel stainless steel plate, sheet, strip for pressure vessel.
	ST316	A 240 TYPE 316
Aluminum: Channel	AL	B 221 TYPE 6063 T6	Aluminum alloy extruded bar, rod, wire, shape, and tube

Channel Finish Specifications
Finish	*Finish Code	Description
Paint-Green Powder Coating	GR	A dark green low gloss powder coating is applied and thoroughly baked after steel has been cleaned and phosphatized.
Electroplated	EG	Fittings and hardware supplied as "Electro-Galvanized" in accordance with ASTM B 633.
Mill-Galvanized (Pre-Galvanized)	PG	Galvanized steel used in the manufacture of channel sections conforms to ASTM A 653 GR33 G90. Uncoated edges resulted from slitting, punching and channel cut off are present.
Hot Dip Galvanized After Fabrication	HG	Channel and fittings which are hot dip galvanized after fabrication conform to one of the following specifications. ASTM A 123, ASTM A153 or ASTM A386.
Special Coatings	PL, GOLD	Other commercially available finishes can be supplied per specification when required to protect applications.

1⅝" x 6½" (41mm x 165mm) 12 Gauge Back-to-Back Channel

Span In (mm)	Max. Uniform Load (W) Lbs (kN)	Deflection at Load (W) In (mm)	Uniform Load at Deflection Span /240 Lbs (kN)	Lateral Bracing Load Reduction Rate
12 (305)	6,920 (30.8) *	0.00	6,920 (30.8) *	1.00
24 (610)	6,920 (30.8) *	0.01 (0.5)	6,920 (30.8) *	1.00
36 (914)	6,920 (30.8) *	0.02 (0.5)	6,920 (30.8) *	1.00
48 (1,219)	6,920 (30.8) *	0.05 (1.0)	6,920 (30.8) *	0.96
60 (1,524)	6,540 (29.1)	0.10 (1.8)	6,540 (29.1)	0.90
72 (1,829)	5,450 (24.2)	0.13 (3.3)	5,450 (24.2)	0.83
84 (2,134)	4,670 (20.8)	0.19 (4.8)	4,670 (20.8)	0.75
96 (2,438)	4,090 (18.2)	0.25 (6.4)	4,090 (18.2)	0.68
108 (2,743)	3,630 (16.1)	0.32 (8.1)	3,630 (16.1)	0.60
120 (3,048)	3,270 (14.5)	0.39 (9.9)	3,270 (14.5)	0.53
132 (3,353)	2,970 (13.2)	0.48 (12.1)	2,970 (13.2)	0.49
144 (3,658)	2,730 (12.1)	0.57 (14.4)	2,730 (12.1)	0.45
156 (3,962)	2,520 (11.2)	0.67 (16.9)	2,520 (11.2)	0.42
168 (4,267)	2,340 (10.4)	0.77 (19.6)	2,340 (10.4)	0.38
180 (4,572)	2,180 (9.7)	0.89 (22.5)	2,180 (9.7)	0.34
192 (4,877)	2,040 (9.1)	1.01 (25.5)	2,040 (9.1)	0.31
204 (5,182)	1,920 (8.5)	1.13 (28.8)	1,920 (8.5)	0.27
216 (5,486)	1,820 (8.1)	1.28 (32.4)	1,820 (8.1)	0.24
228 (5,791)	1,720 (7.7)	1.42 (36.1)	1,720 (7.7)	0.22
240 (6,096)	1,640 (7.3)	1.58 (40.1)	1,640 (7.3)	0.20

* Load limited by spot weld shear
** KL ⁄ r > 200
NR = Not Recommended
Beam loads shown are total uniform load, including the channel weight, for a simple span supported at each end that is adequately laterally braced. Refer to pages 34 - 36 for other beam support conditions.

1⅝" x 6½" (41mm x 165mm) 12 Gauge Back-to-Back Channel

Unbraced Height In (mm)	Max. Slot Face Load Lbs (kN)	Max. Column Load Applied at C.G. K = 1.0 Lbs (kN)
12 (305)	11,040 (49.1)	40,490 (180.1)
24 (610)	10,820 (48.1)	36,400 (161.9)
36 (914)	10,490 (46.7)	31,330 (139.4)
48 (1,219)	10,080 (44.8)	26,520 (118.0)
60 (1,524)	9,400 (41.8)	22,520 (100.2)
72 (1,829)	8,650 (38.5)	19,410 (86.3)
84 (2,134)	7,930 (35.3)	17,050 (75.8)
96 (2,438)	7,280 (32.4)	13,400 (59.6)
108 (2,743)	6,660 (29.6)	10,590 (47.1)
120 (3,048)	5,800 (25.8)	8,580 (38.2)
132 (3,353)	5,060 (22.5)	7,090 (31.5)
144 (3,658)	4,420 (19.7)	**
156 (3,962)	3,870 (17.2)	**
168 (4,267)	3,430 (15.3)	**
180 (4,572)	**	**
192 (4,877)	**	**
204 (5,182)	**	**
216 (5,486)	**	**
228 (5,791)	**	**
240 (6,096)	**	**

Beam Loading of Punched Channels

Load for punched channel is obtained by multiplying the loads shown by the following reduction factors:

Channel with Short Slots. . . . . . . . . . . . . . . . . 0.90
Channel with Holes . . . . . . . . . . . . . . . . . . . . . 0.95

Wt./Ft. Lbs. (Kg/M)	Area of Section Sq. in. (Sq. cm)	X-X Axis			Y-Y Axis
		Ix in.4 (Ix cm4)	Sx in.3 (Sx cm3)	rx. in. (rx. cm)	Iy in.4 (Iy cm4)	Sy in.3 (Sy cm3)	ry in. (ry cm)
15⁄8" x 61⁄2" (41mm x 165mm) 12 Gauge Back-to-Back Channel
6.14 (9.14)	1.804 (11.64)	6.34 (263.85)	1.951 (31.97)	1.874 (4.76)	0.871 (36.25)	1.072 (17.57)	0.695 (1.77)