Type To 1 5 X 4

Machinability is rated at 78% of B1112. Average cutting speed 130 ft/min. This grade is easily welded by all welding processes including gas, air, and submerges arc, and the resultant welds and joints are of extremely high quality. Preheat and post-weld heating is generally not necessary. 278 Floor/Ceiling Designs– G002 2 hr. R; FR-83 12 x 12; Z-runners Fluorescent type, 576 sq. 2-1/2 concrete; Metal lath; Concrete and Steel Joists 2 hr. UR 12 x 24 2 x 4—24% 10 bar joists 24 o.c. Carbon Flooring & Grating. Ryerson carbon flooring and grating comes in both 4-way floor plate and diamond floor plate. Our 4-way carbon floor plate comes in two lug pattern sizes and a variety of gauges. The diamond patterns provide skid resistance for a variety of environments, including truck and trailer beds, walkways, platforms, stair. Free graphing calculator instantly graphs your math problems. Floors of 3 inch (7.6 cm) wood plank or 4 inch (10.2 cm) laminated plank, both surfaced with 1 inch (2.5 cm) flooring; roof of 2 inch (5.1 cm) wood plank, 3 inch (7.6 cm) laminated plank, or 1-1/8 inch tongue-and-groove plywood deck; wood column supports not less than 8 inch (20.3 cm) x 8 inch (20.3 cm), wood beams or girders not less than 6.

• Type To 1 5 X 4 Labels
• 1 Modulus 5

Just curious as to the reasoning. Is it a spec, or is it simply for backwards compatibility?

The 2x4 refers to the rough-cut green wood: it shrinks during drying, then the dried wood is planed smooth, so the finished lumber is supposed to end up at 1.5'x3.5'. While it doesn't really shrink that much, the mills get more usable finished 2x4's from a given tree if they cut them slightly smaller to begin with.

Here's the Wikipedia article about it.

The reason given these days is quite a bunch of BS. The real reason is the lumber mills decided some decades ago to cut green wood smaller - getting more boards out of a log. The shrinkage continues even now as you'll notice all lumber sizes are shrinking even with the 'reason' that was sold to the public as to why the boards are not full measurements.

It was in the late 60's, early seventies they started shrinking more and more. The norm prior was you asked for a 1x or 2x and you received a 1x or 2x full plus a 1/16'-1/8'. The 1/16' or 1/8' inch additional was given as most would want to plane the boards to the full thickness.

Same was for the width. It was always the full measurement plus an 1/8'.

And yes, everyone questioned why the boards where not coming in full anymore. The reason given is what has been spread around and continues to be spread around as truth when in fact it couldn't be farther from the truth.

That's why today, at the time of this writing a 1x is barely over a 1/2'.

It's shrunk from 1 1/8' to 1' to 7/8' to 3/4' to 5/8' to .61' at its current state.

The Mills took into account shrinkage when cutting way back. They took into account warpage, and planning to achieve a full 1' thick board.

The excuse they give is like saying the bottle of water you bought is only half full because it evaporated on the way to the store.

Or the extra large shirt you bought shrunk after they washed it before shipping out to the store therefore it's a medium.

It's all BS and you're getting ripped off just like the rest of us, that's why they're not the correct size these days.Sad but. that's the truth.

You might find this interesting: History of Yard Lumber Size Standards

From the summary

Economic pressures among the regional areas of lumber production have resulted in a decrease of standard lumber sizes over the period covered by this history.

Omnigraffle pro 6 4. It goes into a lot of interesting detail.

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(Drawn Over Mandrel). DOM Steel Tube is produced using uniformly high quality C1020 steel strip and is formed and electric resistance welded into its basic shape. After annealing to produce a uniform grain structure throughout, the tube is then cold drawn over a mandrel to give it these advantages: uniform concentricity around the central axis, better ovality, closer tolerances, denser surface, uniform wall thickness, and higher physical properties. The cold working process works the weld area to produce a sound, dense, and homogeneous structure comparable to that of the base metal. The weld line disappears, causing DOM tube to be virtually seamless. The surface is superior to that of regular seamless tubing, since the material has been cold drawn from strip steel. The hole is straight and concentric with the outside diameter. DOM Steel Tube may be machined, formed, welded, carburized, and subjected to other fabricating techniques that are ordinarily applied to low carbon steel. The use of DOM Steel Tube gives you a guaranteed micro-inch surface and lower productions costs by reducing or eliminating such operations as boring, honing, and finishing.

ANALYSIS

DOM Steel Tube generally conforms to ASTM A513 Type 5

APPLICATIONS

DOM Steel Tube can be used for a wide variety of mechanical applications. It may be used either statically or dynamically. Its close tolerances, good finish, and dense structure make it ideal for parts such as bearings, shafts, cylinders, axles, bushings, collets, conveyor rolls, couplings, fittings, steering columns, shift levers, airbag inflators, damper tubes, power seat mechanisms, engine mounts, fuel rails and injection components, motorcycle and snowmobile frames, supports and guards, diesel injection components, piston pins, seat assembly components, torque wrenches, extensions and handles, shanks, etc

MACHINEABILITY AND WELDABILITY

Type To 1 5 X 4 Labels

Machinability is rated at 78% of B1112. Average cutting speed 130 ft/min. This grade is easily welded by all welding processes including gas, air, and submerges arc, and the resultant welds and joints are of extremely high quality. Preheat and post-weld heating is generally not necessary.

HEAT TREATING

DOM Steel Tube will respond to any carburizing method and subsequent heat treatments. Case hardening results in a hard case and relatively soft core. Carburize at 1650°-1700°, oil or water quench and temper at 300°. Carburizing depth is typically .060-.070'.

SPEEDY METALS ITEMS

1 Modulus 5