Simpson Strong-Tie Rush Orders: Angle Brackets, SD Screws, Impulse Nail Guns, and Stainless Cap Nuts FAQ

I coordinate emergency structural hardware orders for a regional construction supply company. I've handled 200+ rush orders in 12 years, including same-day turnarounds for commercial framing and deck contractors. This isn't a catalog. It's the stuff that actually trips people up when the inspection is tomorrow and the hardware schedule doesn't match what's on the truck. Everything here is about simpson-strong-tie hardware—angle brackets, SD screws, and related parts—not generic connectors. Quick disclaimer: I'm not a structural engineer. For any load-bearing connection, follow the engineer's drawings, the connector manufacturer's instructions, and local code. Here are the questions I get most often.

What should I check first when I order a Simpson Strong-Tie angle bracket in a hurry?

Don't start with "do you have any angle brackets?" Start with the exact model number. Simpson Strong-Tie angle brackets can look almost identical but differ in gauge, geometry, and approved fasteners. According to Simpson Strong-Tie's 2025 Product Catalog (strongtie.com), each connector has a specific fastener schedule. A simpson strong tie angle bracket like an L70 might call for different nails or SD screws than an L90 or A21. Check the label, the ICC-ES evaluation report, and the engineer's hardware schedule.

In March 2024, a commercial framing client called 36 hours before an inspection. They needed 40 L70ZMAX brackets. The original order said "L70" without the coating suffix. Normally that's a detail you catch in review. We caught it, swapped to ZMAX, paid about $400 extra in rush freight on top of a $1,800 base order, and delivered by 7 a.m. If we'd shipped the wrong coating, the inspector could have flagged it for exterior exposure. The delay would've cost the client a day on the schedule. (Note to self: always read the suffix.)

Which Simpson Strong-Tie SD #9 x 1-1/2" connector screw should I use, and can I substitute?

Use the fastener listed for that connector. For many Simpson Strong-Tie connectors, that's a simpson strong tie sd #9 x 1-1/2" connector screw. It's a specific screw design, not a generic wood screw. The 2025 Simpson Strong-Tie catalog lists SD connector screws for shear, tension, and withdrawal values when used in approved connectors. If the connector says SD #9 x 1-1/2", don't swap in a longer deck screw or a drywall screw because that's what's in the truck. The inspector may reject it, and more importantly, the connection may not be what the engineer specified.

We didn't have a formal fastener substitution process for years. Cost us when a rush order went out with a different screw because SD #9 was out of stock. The installer used it anyway. Inspector wanted the listed fastener. We overnighted two boxes of SD screws for $180, but the crew lost half a day. That's when we implemented a "no substitutions without written approval" policy. An informed customer asks better questions—so ask your supplier to match the exact model and length before you approve the order.

Can I use an impulse nail gun for Simpson Strong-Tie connectors?

Usually, no—not unless the connector instructions specifically allow it. An impulse nail gun is great for framing nails, but it isn't a universal connector tool. Simpson Strong-Tie connectors often require specified nails driven in specific holes at specific angles. An impulse nail gun can overdrive, underdrive, or shoot the wrong nail type. If the hardware schedule calls for 10d x 1-1/2" connector nails, use those. If it calls for SD screws, use those.

Had two hours to decide on a joist hanger repair last year. Normally I'd wait for the engineer to confirm. But with the framing crew standing around, we went with the connector's printed instructions and hand-driven nails. It worked. But I've also seen a crew try an impulse nail gun on hangers because it was faster. The inspector failed the connection and they had to pull and replace every nail. That's way more expensive than doing it right the first time. Check the label. It takes 30 seconds.

What's the deal with stainless steel cap nut? Do I really need one?

A stainless steel cap nut is often used to cover exposed threads and give a clean finish, especially on anchor rods, threaded rod, or visible hardware. But in exterior, coastal, or wash-down environments, it's also a corrosion decision. Use stainless with stainless. If you put a stainless steel cap nut on a zinc-plated bolt in a wet area, you can get galvanic corrosion. If you use a plain steel cap nut on stainless rod, you may see rust bleeding within months.

One marina project called us in a panic because the punch list flagged rust stains on exposed anchor rods. The crew had used zinc cap nuts on stainless threaded rod. We swapped in 316 stainless cap nuts. The parts cost about $600 more than the original order, plus overnight freight, but it saved a re-inspection and a very unhappy owner. Also: don't assume a cap nut has the same load capacity as a heavy hex nut. If it's a structural connection, the engineer needs to approve the nut type. A cap nut is often a finish item—not a substitute for the specified structural nut.

Can you polish with an angle grinder?

Yes, you can polish with an angle grinder—but be careful about what you're polishing. With the right discs and compounds, an angle grinder can polish stainless steel, mild steel, or aluminum. The problem is that polishing removes material. On structural hardware, that can mean removing a protective coating like ZMAX, galvanizing, or paint. It can also heat the metal and change the surface. For a stainless steel cap nut or a visible bracket, a light polish with a stainless-specific pad is one thing. Grinding a galvanized simpson strong tie angle bracket to make it shiny is another.

In 2023, a crew polished a batch of galvanized brackets for a visible lobby beam. Looked great for about two weeks. Then the inspector flagged the coating damage. We had to replace them with stainless or re-galvanize. That was a $2,400 mistake on a $9,000 job. If you must polish, use low speed, dedicated stainless pads, and keep heat down. And never polish a load-rated connector without checking with the engineer or manufacturer first. (Mental note: keep a scrap piece to test before touching the real hardware.)

How do I avoid a last-minute disaster when ordering these parts?

Build a checklist. Seriously. Our company lost a $14,000 contract in 2022 because we tried to save $300 on standard freight instead of rush. The order arrived two days late. The GC pulled the work from us. That's when we implemented a 48-hour buffer policy for structural hardware. Now every rush order gets a photo of the label, a count of pieces, and a confirmation of the exact model numbers before it leaves the warehouse.

If you're the buyer, give your supplier the full hardware schedule, not just "angle brackets and screws." Include: connector model, coating, quantity, fastener type, length, and finish. For example: "40 Simpson Strong-Tie L70ZMAX angle brackets, 300 SD #9 x 1-1/2" connector screws, 50 316 stainless cap nuts." That one sentence prevents a ton of back-and-forth. And if the order is urgent, ask for a real tracking number, not a promise. In my role coordinating rush orders, the jobs that go wrong are almost never the ones with the most complex parts. They're the ones with the vaguest specs.

What do most contractors miss about code-compliant connections?

They treat the bracket as the connection. It isn't. The connection is the bracket plus the fasteners plus the anchorage plus the installation. A code-compliant Simpson Strong-Tie connection depends on all four. According to Simpson Strong-Tie's engineering literature (strongtie.com), many connectors are recognized for use with specific fasteners and installation details. The ICC-ES evaluation report is the document the inspector may check. If the report or the connector label calls for a specific screw or nail, that's what has to go in.

I've watched rush jobs fail because someone focused on what was in stock instead of what was approved. The fix is simple: keep the current catalog page and the evaluation report with the submittal. If you're short on time, call the supplier and ask them to verify the model against the report. It takes five minutes. An informed customer makes faster decisions because they're not guessing. And if the inspector rejects something, don't argue. Ask for the correction in writing, take photos, and get the engineer and supplier on the same call. That's how you turn a red tag into a same-week fix.