Every bolt we sell carries its grade mark, and every bar leaves sawn to your length.
Socket head cap screws, Grade 5 and Grade 8 hex cap screws, nuts and washers by the box, B7 studs, concrete anchors, rivets and inserts. Plus 1018, 1045 and 6061 bar cut to length and plate blanks squared on the saw. For maintenance techs, machine shops and fab bays in Austin and across Texas.
Each module shows the size range we carry, the material or grade, and how it is priced. Nothing on this rail is a commodity mystery part. If a section does not list your size, send it anyway and we will say in writing whether we can get it and when.
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We count on a parts scale, not by eye. A bag of 1/2-13 Grade 8 that comes back eight short costs a millwright half a shift, so the count is set from a ten-piece sample of the actual lot on the bench, not a number from a chart.
Graded threads get a go/no-go check before they are bagged. A ring gauge goes on a sample of the screws, a plug gauge goes into a sample of the nuts. If the go side will not run on by hand, the lot does not go out.
Ten pieces from the lot set the piece weight on the scale. Mixed lots are never counted together.
Go/no-go ring on screws, plug on nuts. Fastener grades only; consumables skip this step.
Thread, length, grade or alloy, finish, count and lot go on the label in that order.
Saw-cut bar and plate leave deburred, with the cut length written on the piece in paint marker.
If there are no lines, we did not sell it to you. This is the table the counter works from when a buyer asks what will hold, and why we stock some grades and refuse others.
| Grade or spec | Head marking | Min tensile | Material | Typical use |
|---|---|---|---|---|
| SAE J429 Grade 2 | None | 74 ksi to 3/4 in, 60 above | Low or medium carbon steel | Light brackets. Not stocked as hex cap screws: unmarked heads are the reason. |
| SAE J429 Grade 5 | 3 radial lines | 120 ksi to 1 in, 105 above | Medium carbon, quenched and tempered | General machinery, guards, mounts, most equipment frames |
| SAE J429 Grade 8 | 6 radial lines | 150 ksi | Medium carbon alloy, quenched and tempered | High clamp load, press frames, trailer and suspension work |
| ASTM A574 | Maker ID, knurled head | 180 ksi to 1/2 in, 170 above | Alloy steel, black oxide and oil | Die sets, fixtures, counterbored machine joints |
| 18-8 stainless | "18-8" plus maker | About 70 ksi cold-worked | Austenitic 300 series | Food equipment, washdown, outdoor fresh water |
| 316 stainless | "316" plus maker | About 70 ksi cold-worked | Austenitic, molybdenum bearing | Salt air, pool chemistry, chlorides |
| ASTM A193 B7 | "B7" on stud end | 125 ksi to 2.5 in | Chromoly, quenched and tempered | Flange bolting with 2H heavy hex nuts, heat service |
Zinc on a Grade 8 screw is yellow for a reason. Plating a hardened screw can trap hydrogen, and the plater bakes it out afterwards. Ask before you put plain-finish alloy outdoors, and ask before you replate anything over 150 ksi yourself.
Stainless numbers are lower than people expect. 18-8 is about half the tensile of a Grade 8, so swapping stainless into a load path to stop rust is a strength downgrade. We will say so in the reply if your list does it.
Hex cap screws without grade marks and stainless without a stated alloy are not on our shelves. A mystery bolt in a load path is the failure we see most often at the counter: a replacement pulled from a coffee can, threaded into a Grade 8 joint, and stretched on the first hard load.
We quote by the box of 100 because that is how they come off the pallet. If you need four 3/8-16 × 1 in screws, a hardware store is quicker and cheaper. Larger diameters, B7 sets and cut blanks are the exceptions, and each section says so.
Call with a question, by all means. A price goes out in writing against a written list, because "half-inch bolts" spoken over a shop floor has turned into the wrong pitch and the wrong grade more than once.
If we are out of what you asked for, the reply says so and offers the alternative by name. Nothing gets substituted silently. We also make no certification claims on your behalf: the label carries what we know about the lot, nothing more.
We reply in writing with what is on the shelf and what is not, a price against the basis for each line, and a lead time where something has to come in. Phone or email, one of them is enough.
18-8 galls if you run it dry and fast. A dab of anti-seize costs less than a seized nut, and we will add a line for it if your list is all stainless.
