Miscellaneous channels selected by complete designation, flange projection and web thickness
We supply hot-rolled MC miscellaneous channels for fabrication and structural material schedules. Each line keeps the complete designation, grade, length and piece count. Same-depth MC variants have different flange widths and web thicknesses; the replacement order matches those section dimensions to the actual connection.
| Section | Full MC designation with nominal depth and mass per foot |
|---|---|
| Steel grade | Specified material grade, stated alongside ASTM A6 general requirements |
| Length | Straight supplied length or drawing-defined cut length |
| Mating surfaces | Outside web, inside web, flange faces and root envelope identified |
| Finish | Bare or separately specified galvanized/coated supply |
| Preparation | Cut faces or drawing work quoted against the selected section |
The reference rows show why the mass designation must remain with the nominal depth.
| MC designation | Depth d (in.) | Flange width bf (in.) | Web tw (in.) | Average flange tf (in.) | Nominal mass (lb/ft) |
|---|---|---|---|---|---|
| MC12×31 | 12.00 | 3.670 | 0.370 | 0.700 | 31.0 |
| MC12×35 | 12.00 | 3.765 | 0.465 | 0.700 | 35.0 |
| MC12×40 | 12.00 | 3.890 | 0.590 | 0.700 | 40.0 |
| MC12×45 | 12.00 | 4.010 | 0.710 | 0.700 | 45.0 |
| MC12×50 | 12.00 | 4.135 | 0.835 | 0.700 | 50.0 |
| MC18×42.7 | 18.00 | 3.950 | 0.450 | 0.625 | 42.7 |
| MC18×58 | 18.00 | 4.200 | 0.700 | 0.625 | 58.0 |
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Nucor-Yamato nominal MC identification references, March 2024 table, PDF page 49. The offer confirms the requested designation and grade within our advertised MC family. Supplied dimensional tolerances and structural requirements follow the accepted specification. Average flange thickness identifies the reference section; a mating detail uses the actual tapered-face and root geometry.
In MC12×35, 12 identifies the nominal depth series and 35 the nominal pounds per foot. The flange dimensions come from that complete section designation, while the selected steel grade provides its material requirements.
Inner-flange slope varies among the MC shapes in the producer reference. The selected MC profile supplies the flange and root geometry used by its mating detail; C and parallel-flange UPE sections keep their own profiles.
ASTM A6 supplies general rolled-section requirements; the specified material grade supplies its own chemistry and mechanical criteria. Our channel order states both the complete section and the actual material grade.
A plate fixed against the flat outside web uses a different datum from an insert seated against the inside web. The 0.465 in. web-thickness difference between the two MC12 end references shifts that inner face without changing their 12 in. depth.
The same-depth MC12 reference set changes overall flange width from 3.670 to 4.135 in. A fixture or bracket extending around the flange is checked against the projection of the selected designation.
The MC12 reference rows list T as 9.475 in. and k as 1.263 in. These section-table references locate the root region. The connection drawing uses the actual rolled fillet and required clearance to check the specific bolt, socket or inserted plate envelope.
An asymmetric channel has an open side and a flat back. A prepared-member drawing identifies the datum face, open-side direction and connection-feature positions so each supplied piece reaches fabrication in its intended orientation.
The retained designation and mating dimensions guide a replacement order. If only the nominal depth is known, flange width and web thickness help distinguish likely sections before the material line is accepted.
An insert or cross plate fitted between the flanges needs the selected section’s inside profile, root region and orientation. A wider or heavier MC alternative can change that fit even where its strength appears suitable.
Section checks include depth, flange width and web thickness. The full designation remains linked to the material record and packing group, keeping same-depth weight variants identifiable.
Fillet radius, rolled variation and inner-face shape affect close-fitting parts. A nominal table supports identification; the accepted drawing and tolerance basis govern the required connection fit.
The open side, cut faces and any specified hole or attachment pattern are checked from the drawing datum. Required coatings retain their own finished-fit allowance around the mating surfaces.
Nominal 20 ft lengths of MC12×31 and MC12×50 represent 620 and 1,000 lb of theoretical steel respectively. That 380 lb difference follows the published lb/ft designations; it excludes actual mass variation, coatings, preparation and packing.
MC12 weight variants retain their own bundle identities. Packing lists show the full designation, supplied length and piece count for each group.
Support and separators keep flange projections and cut ends away from damaging strap contact. Any prepared attachment parts are counted separately from the straight channel lengths.
MC identifies miscellaneous channels in the American structural-shape designation system. The following numbers identify the nominal depth series and nominal weight per foot; the material grade is specified separately.
The proposed section is identified separately for acceptance of its flange width, web, mass, section properties and connection fit. The approved designation then remains on the order and prepared-member drawing.
For a tapered-flange shape, the listed value is an average flange-thickness reference. The thickness near a rolled root and flange edge differs; a close-fitting or bolted attachment uses the actual profile and connection detail.
The selected flange faces, root fillets and rolled tolerances define the usable inside region. The mating drawing states the MC designation, insertion orientation and required clearance.
It multiplies each nominal lb/ft designation by the same 20 ft example length. The actual offer separately states supplied lengths, weighed or theoretical quantity basis, coating and packing.
Yes. Each full designation and length has its own piece count and packing group. Same-depth variants stay distinct so receiving and fabrication can allocate the correct channels to each member mark.
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Send the complete MC designations, grades, lengths and piece counts. For replacement or fitted members, include the back-face datum, inside-profile or connection drawing and any finish requirement. We identify the offered sections and preparation with destination terms.