Product Overview

• Thickness: 18 Ga. (1.2 mm)
• Standard lengths: 10’ (3.05 m)
• Standard finishes: Plain, Dura-Green,
Pre-Galvanized
• W
eight: .29 Lbs./Ft.
(.43 kg/m)
SECTION PROPERTIES
BEAM LOADING
B72A
Wt. .58 Lbs./Ft. (.87 kg/m)
Areas of Moment of Section Radius of Moment of Section Radius of
Channel Weight Section Inertia (I) Modulus (S) Gyration (r) Inertia (I) Modulus (S) Gyration (r)
lbs./ft. kg/m sq. in. cm
2
in.
4
cm
4
in.
3
cm
3
in. cm in.
4
cm
4
in.
3
cm
3
in. cm
B72 .287 (.43) .084 (.54) .0018 (.07) .0073 (.12) .146 (.37) .0077 (.32) .0190 (.31) .302 (.77)
B72A .574 (.85) .169 (1.09) .0078 (.32) .0192 (.31) .215 (.55) .0155 (.65) .0382 (.63) .303 (.77)
X - X Axis Y - Y Axis
Uniform Load @ Deflection =
Beam Span Channel Uniform Load and Deflection 1/240 Span 1/360 Span
In. mm Style Lbs. N In. mm Lbs. N Lbs. N
12 (305)
B72 116 (516.0) .051 (1.29) 113 (502.6) 75 (324.7)
B72A 210* (934.1) .020 (.51) 210* (934.1) 210* (934.1)
24 (609)
B72 58 (258.0) .206 (5.23) 28 (124.5) 19 (84.5)
B72A 159 (707.2) .125 (3.17) 127 (564.9) 85 (378.1)
36 (914)
B72 39 (173.5) .465 (11.81) 13 (57.8) 8 (35.6)
B72A 106 (471.5) .281 (7.14) 57 (253.5) 38 (169.0)
36 (1219)
B72 29 (129.0) .827 (21.00) 7 (31.1) 5 (22.2)
B72A 80 (355.8) .500 (12.70) 32 (142.3) 21 (93.4)
60 (1524)
B72 23 (102.3) 1.292 (32.81) 5 (22.2) 3 (13.3)
B72A 64 (284.7) .782 (19.86) 20 (88.9) 14 (62.3)
Max. Column Loading K = .80
Max. Column Loading (Loaded @ C.G.)
Unbraced Channel Loaded@ Loaded@
Height
Style C.G. Slot Face K = .65 K = 1.0 K = 1.2
In.
mm
Lbs. N Lbs. N Lbs. N Lbs. N Lbs. N
12 (305)
B72 1598 (7108) 539 (2397) 1712 (7615) 1410 (6272) 1181 (5253)
B72A 3600 (16013) 986 (4386) 3700 (16458) 3433 (15271) 3229 (14363)
24 (609)
B72 701 (3118) 320 (1423) 1050 (4670) 450 (2001) 313** (1392)
B72A 2710 (12054) 802 (3567) 3113 (13847) 2043 (9088) 1421 (6321)
36 (914)
B72 313** (1392) 188 (836) 473 (2104) 201** (894) –
–
B72A 1421 (6321) 569 (2531) 2135 (9497) 909 (4043) 631** (2807)
36 (1219)
B72 177** (787) 122 (542) 267** (1187) –– – –
B72A 799 (3554) 404 (1797) 1211 (5387) 512** (2277) 355** (1579)
60 (1524)
B72 1
13**
(502) 85 (378) 171** (760) –
–
–
–
B72A 512** (2277) 298 (1325) 775 (3447) 327** (1454) ––
COLUMN LOADING
Calculations of section properties are based on metal thicknesses as determined by the AISI Cold-Formed Steel Design Manual.
Based on simple beam condition using an allowable design stress of 25,000 psi (172 MPa) in accordance with MFMA, with adequate
lateral bracing (see page 11 for further explanation). Actual yield point of cold rolled steel is 42,000 psi. To determine concentrated
load capacity at mid span, multiply uniform load by 0.5 and corresponding deflection by 0.8. *Failure determined by weld shear.
**Where the slenderness ratio
KL
exceeds 200, and K = end fixity factor, L = actual length and r = radius of gyration.
r
13
/16”
(20.6)
7
/16”
(11.1)
.406
(10.3)
.160
(4.0)
3
/32”
(2.4)
3
/16”
(4.7)
3
/16”
(4.7)
13
/32”
(10.3)
13
/16”
(20.6)
13
/16”
(20.6)
.406
(10.3)
.406
(10.3)
Y
Y
X
X
Mini Channel & Fittings
Reference page 200 for general fitting specifications.
B72 Channel
202