What prerequisites do I need for Bolted Connection Checklist?

You should be familiar with the relevant structural steel design code, have your project loads and geometry defined, and understand the limit states you need to check. The guide walks through each step with code references — have the applicable code edition available for verification.

Can I apply this guide to any steel design project?

The guide covers standard design procedures that apply broadly to steel structures. However, project-specific conditions (unusual geometry, dynamic loading, high-temperature service, fatigue, seismic demand) may require additional checks beyond the scope of this guide. Always consult the full code text for your project.

How do I verify the results from this guide?

Use the free calculators on Steel Calculator to run each check independently with your specific inputs. Cross-check against hand calculations using the referenced code clauses. A licensed Professional Engineer must review and stamp all final designs.

Bolted Connection Checklist | Steel Calculator

---------------------- | -------------------------------------------------- | ----------------------------------------- | --------------------------------------------- | ---------------------- | | Bolt shear phi | 0.75 | 0.80 | gamma_M2 = 1.25 | 0.80 | | Bearing phi | 0.75 | 0.90 | gamma_M2 = 1.25 | 0.80 | | Net section phi | 0.75 | 0.85 (rupture) | gamma_M2 = 1.25 | 0.75 | | Hole deduction | d_hole + 1/16 in | d_hole + 2 mm | d_hole (no addition for punched holes ÃÂ¢ÃÂÃÂ¤ 25mm) | d_hole + 2 mm | | Bearing formula | 2.4 d t Fu (deformation) | 3.2 d t fu (per bolt) | 2.5 d t fu / gamma_M2 | 3.0 d t Fu | | Block shear | 0.6 Fu Anv + Ubs Fu Ant | 0.6 fy Agv + fu Ant | Similar approach per Cl. 3.10.2 | 0.6 Fu An + Ubs Fy Ag | | Slip-critical (Class A) | mu = 0.30, phi = 1.0 or 0.85 | mu = 0.35, phi = 0.70 | mu = 0.20, gamma_M3 = 1.25 | mu = 0.30, phi = 0.82 | | Tension-shear interaction | (ft/phi Fnt')^2 + (fv/phi Fnv)^2 <= 1.0 (modified) | Linear (Vf*/phi Vf + Ntf*/phi Ntf <= 1.0) | (Fv/Fv,Rd)^2 + (Ft/Ft,Rd)^2 <= 1.0 | Elliptical interaction |

Geometry & detailing

Bolt diameter, grade/class, and installation method are defined (and consistent with procurement).
Hole type is explicitly stated (standard/oversize/slotted) and matches the detail.
Edge distances, pitch, and gage are recorded and checked against minimum detailing rules.
Plate thickness and any cope/notch geometry that affects net section are captured.
Maximum edge distance and maximum pitch limits are checked (these are easy to overlook).
For multi-row patterns, confirm the bolt count and row layout match the intended configuration.

Demand definition

Shear and tension demands are defined at the connection interface (and not double-counted).
Eccentricity assumptions are explicit (e.g., load applied through centroid vs offset).
Confirm whether demands are factored (LRFD/Limit States) or service-level (ASD/Working Stress).

Failure modes (ensure you at least consider them)

Bolt shear and/or bolt tension (as applicable).
Plate bearing and tear-out (detail-dependent, requires clear distance calculations).
Net section rupture and block shear/tearing paths.
Group effects and load distribution assumptions (especially for large bolt groups).
Shear-tension interaction (when both are present simultaneously).
Slip-critical checks (if specified — note the faying surface class matters).

Documentation

State which checks were evaluated by the calculator and which were not.
Record the governing standard and edition (e.g., AISC 360-22 LRFD, AS 4100-2020).
Keep a screenshot or exported report with inputs and outputs.
Archive the calculation with a date stamp so results can be reproduced later.

Frequently Asked Questions

What is the most common error in bolted connection calculations? Hole type mismatch. Using standard hole deductions when the detail calls for oversize or slotted holes changes net area and bearing calculations significantly.

Should I check both bearing and slip-critical? If the connection is specified as slip-critical, the slip check governs serviceability. Bearing and shear checks still apply as ultimate limit states. Both should be documented.

Why does the calculator show different results than my hand check? The most frequent causes are: different hole deduction conventions, different clear distance formulas for tear-out, or a mismatch between threads-included vs threads-excluded shear capacity. Check these before assuming either result is wrong.

Does this checklist apply to all bolt standards? It is standard-agnostic. The items apply whether you are working with AISC 360, AS 4100, EN 1993-1-8, or CSA S16, but the specific factor values and detailing limits differ by code.

Is this checklist engineering advice? No. It is a documentation and QA pattern to help reduce errors and improve traceability. Project criteria and compliance decisions are defined by the governing standard and the engineer of record.

What is the standard hole diameter for a 7/8-inch A325 bolt per AISC Table J3.3, and how does it affect net area calculations? Per AISC 360-22 Table J3.3, the standard hole diameter for a 7/8-inch bolt is 15/16 inch (0.9375 in). For net area calculations per AISC Section B4.3, an additional 1/16 inch is deducted to account for damage during punching, giving an effective hole diameter of 1-1/16 inch (1.0625 in) for net area calculations — even though the actual hole is only 15/16 inch. For an oversize hole (1-1/16 inch actual), the effective deduction becomes 1-3/16 inch. This 1/16-inch damage allowance is a common source of discrepancy between hand checks and calculator outputs.

What minimum pitch and minimum edge distance apply to 3/4-inch bolts in standard holes per AISC? Per AISC 360-22 Section J3.3, the minimum center-to-center pitch is 2-2/3 ÃÂÃÂ d_b = 2.0 inches for 3/4-inch bolts, but 3 ÃÂÃÂ d_b = 2.25 inches is preferred. Per AISC Table J3.4, the minimum edge distance for a 3/4-inch bolt to a sheared edge is 1-1/4 inches and to a rolled/gas-cut edge is 1 inch. The absolute minimum clear distance for bearing (J3.10) is 1.5 ÃÂÃÂ d_b = 1.125 inches from the hole edge to the material edge, measured in the direction of force. Maximum edge distance per J3.5 is the lesser of 12t or 6 inches (for unpainted members in contact), where t is the thickness of the connected element.

Run This Calculation

ÃÂ¢ÃÂÃÂ Bolted Connection Calculator — bolt shear, bearing, tension, and block shear checks per AISC 360, AS 4100, EN 1993, and CSA S16.

ÃÂ¢ÃÂÃÂ Gusset Plate Calculator — gusset plate and weld design for bracing connections.

ÃÂ¢ÃÂÃÂ Splice Connection Calculator — beam and column splice bolt group design.

Disclaimer (educational use only)

This page is provided for general technical information and educational use only. It does not constitute professional engineering advice, a design service, or a substitute for an independent review by a qualified structural engineer. Any calculations, outputs, examples, and workflows discussed here are simplified descriptions intended to support understanding and preliminary estimation.

All real-world structural design depends on project-specific factors (loads, combinations, stability, detailing, fabrication, erection, tolerances, site conditions, and the governing standard and project specification). You are responsible for verifying inputs, validating results with an independent method, checking constructability and code compliance, and obtaining professional sign-off where required.

The site operator provides the content "as is" and "as available" without warranties of any kind. To the maximum extent permitted by law, the operator disclaims liability for any loss or damage arising from the use of, or reliance on, this page or any linked tools.