How Much Do Steel Connections Cost?

A typical bolted shear connection costs $75–$250 installed when you add up the bolts, the shear tab or clip angles, and the shop labor to fit and attach it. Moment connections run $500–$2,500+ each because of full-penetration welds, stiffener plates, and inspection. On a per-ton basis, connections add roughly $300–$700/ton to simple-framed jobs and $800–$2,000+/ton to moment-frame work — which is why two jobs with identical tonnage can be a thousand dollars a ton apart.

If you bid steel by multiplying tonnage by a blended rate, connections are where that shortcut bites you. Here's how to break the number down so you can price them instead of guessing.

How much does a bolted connection cost?

Start with the hardware. A structural bolt "assembly" means the bolt, nut, and washer together — that's how suppliers quote them and how you should count them. Typical budgetary ranges for common sizes (your supplier quote will vary with market and quantity, so treat these as planning numbers, not bid numbers):

| Bolt assembly | Typical budgetary cost (each) | |---|---| | A325 3/4" x 2" hex | $2.25 – $2.75 | | A325 3/4" x 3" hex | $2.60 – $3.10 | | A325 7/8" x 3" hex | $3.25 – $3.85 | | A325 1" x 3" hex | $4.00 – $5.00 | | A325 TC (tension control) 3/4" x 3" | $3.00 – $3.75 | | A490 3/4" x 3" hex | $3.10 – $3.75 | | A490 7/8" x 3" hex | $3.85 – $4.60 | | A490 1" x 4" hex | $5.75 – $7.00 |

Three things jump out of that table:

1. A490 runs 10–20% over A325 at the same diameter. If the engineer specs A490 for higher clamping force, the material delta on a whole job is small — the bigger cost is that A490 bolts can't be reused after tensioning and often trigger tighter inspection.
2. TC (tension control) bolts cost 15–20% more than hex but install faster with a shear wrench and give you built-in tension verification. On field-bolted jobs with hundreds of slip-critical connections, the labor savings usually beats the material premium.
3. Diameter matters more than length. Going from 3/4" to 1" nearly doubles the assembly price. Going from 2" to 3" long adds cents.

Now build a full connection. A standard beam-to-column shear tab with (4) 3/4" A325 bolts:

| Component | Cost | |---|---| | (4) A325 3/4" x 2-1/2" assemblies | ~$11 | | Shear tab plate, 3/8" x 4" x 12" (~15 lbs @ $0.80/lb) | ~$12 | | Shop labor: fit + weld tab to column (0.75–1.25 hr @ $80–$120/hr) | $60 – $150 | | Field labor: hang beam, install + snug bolts (crew-minutes, prorated) | $25 – $75 | | Total per connection | $110 – $250 |

The lesson: bolts are almost never the cost driver. Eleven dollars of hardware sits inside a $110–$250 connection. The labor to fit, weld, and install is 80–90% of the money. That's why counting connections accurately matters more than shaving a dime per bolt — miss twenty connections on a takeoff and you've missed $2,000–$5,000, not $220 of bolts.

For a walkthrough of the connection families themselves — shear tabs, clip angles, end plates, moment connections — see our steel connection types guide.

How much do connections add per ton of steel?

Rule-of-thumb ranges from small-shop bid data:

| Framing type | Connection cost per ton | Share of fabricated cost | |---|---|---| | Simple shear framing (warehouses, low-rise) | $300 – $700/ton | 10 – 20% | | Mixed shear + braced frame | $500 – $1,000/ton | 15 – 25% | | Moment frame (wind or seismic) | $800 – $2,000+/ton | 25 – 40% |

A quick way to sanity-check your own number: count connections on the drawings, multiply by your per-connection cost, divide by tonnage. If a 40-ton simple-frame job has 180 connections at an average of $150, that's $27,000 — $675/ton. Right at the top of the simple-framing band, which tells you either the job is connection-dense (lots of short infill beams) or your per-connection average is running hot.

Connection density is the hidden variable. A job framed with long-span joists and few beam lines might have 3 connections per ton. A job chopped up with short beams, kickers, and misc framing can hit 6–8 per ton at the same tonnage. Same steel weight, double the connection money. This is also why cost per ton quotes without a connection count attached are barely comparable between jobs.

What drives connection cost up or down?

Bolt count per connection. A (3)-bolt shear tab and a (10)-bolt extended end plate are different animals in both material and layout/drilling time. Bolt count scales with beam reaction, so heavier framing = more bolts = more holes = more labor.

Plate thickness. Thicker plates cost more per pound, take longer to cut, and — the real hit — need bigger welds. Fillet weld volume scales roughly with the square of the leg size: a 1/2" fillet lays down about four times the weld metal of a 1/4" fillet. When a connection detail bumps from 3/8" to 5/8" plate with matching welds, the labor line can double.

Shop vs. field work. Shop labor is cheaper, faster, and better-controlled than field labor — figure field welding at 2–4× the cost of the same weld in the shop once you account for access, positioning, weather, and inspection hold points. Good detailing pushes welds into the shop and leaves bolting for the field. A connection scheme that requires field welding (common on moment frames and retrofit work) will blow past the ranges above. The full trade-off is covered in bolted vs. welded connection costs.

Snug-tight vs. slip-critical. Slip-critical and fully-tensioned joints require calibrated tensioning (turn-of-nut, TC bolts, or DTI washers) plus faying-surface prep and inspection. Budget 1.5–2× the installation labor of snug-tight bolting.

Galvanizing and coatings. Galvanized connections need oversized holes, galvanized or mechanically-plated hardware (add 30–50% to bolt cost), and Class C faying surfaces verified for slip-critical joints. Small line items that add up on exterior work.

Why do moment connections cost so much more than shear connections?

A shear connection carries vertical load and lets the beam end rotate. A moment connection locks the beam to the column so it transfers bending — and everything about making that rigid costs money:

• Complete-joint-penetration (CJP) welds on the beam flanges, usually with backing bars, run-off tabs, and preheat. Hours of welding versus minutes.
• Ultrasonic testing (UT) on those CJP welds. Inspection cost plus schedule risk if a weld fails and needs repair.
• Continuity plates and doubler plates inside the column at each moment connection — more plate, more fitting, more welding, often in awkward positions.
• Tighter fit-up tolerances, which means slower shop work and more field correction.

A basic bolted shear tab might be $110–$250 all-in. A field-welded moment connection with continuity plates and UT is routinely $1,000–$2,500, and heavy seismic details go higher. That 10× spread on a per-connection basis is what drags moment-frame jobs from $3,800/ton fabricated toward $6,000+/ton. If you're deciding how hard to fight the connection count on a bid, moment vs. shear connections breaks down how to spot each type fast on drawings.

Worked example: pricing connections on a 40-ton job

Say you're bidding a 40-ton single-story commercial frame: mostly simple shear framing, one braced bay, and (8) moment connections at the entry canopy per the lateral drawings.

Step 1 — Count from the drawings:

| Connection type | Count | Avg cost each | Extended | |---|---|---|---| | Shear tabs, (4) 3/4" A325 | 120 | $150 | $18,000 | | Clip-angle connections, (6) bolts | 30 | $200 | $6,000 | | Braced-frame gusset connections | 10 | $450 | $4,500 | | Bolted end-plate moment connections | 8 | $900 | $7,200 | | Total | 168 | | $35,700 |

Step 2 — Check hardware separately. Roughly 700 bolt assemblies across the job at an average of $3 = ~$2,100. Note again: 6% of the connection money is bolts; the rest is plate and labor.

Step 3 — Convert to per-ton. $35,700 ÷ 40 tons = $893/ton for connections. Higher than the simple-framing band — driven by the gussets and moment connections. That's exactly the kind of job where a competitor pricing "40 tons × blended rate" either leaves money on the table or eats the difference.

Step 4 — Stress-test the count. The whole estimate leans on that 168. Miss the kickers on the roof plan or the second gusset at each brace end, and you're short thousands before you've cut a single piece.

That last step is where most estimates actually go wrong. Nobody misprices a shear tab by $500 — they miss fifteen of them on sheet S-201.

How SteelFlo helps you count connections

SteelFlo detects steel members and connections directly from your PDF drawings, draws a bounding box on every detection, and puts you in a review screen to confirm or reject each one — the AI does the finding, you do the verifying, which is how it reaches 95-99% accuracy. Every count is auditable: if it isn't boxed on the drawing, it isn't in your bill of materials. With 4,500+ steel sections across 6 standards behind the weight lookups, the tonnage side of your bid gets the same treatment. You can sanity-check the pricing math on our free steel calculator, no login needed.

Detect connections automatically — start with 3 free takeoffs and see what your next set of drawings actually contains before you price it.