TinnerFlow logoTinnerFlow™
Apprentice Q&A · #026

What's the rule of thumb for how far the all-thread should stick out below the unistrut nut?

1st YearHangers & SupportsYELLOW · Check First

The rod should pass entirely through the nut with a minimum of 2 to 3 full thread pitches exposed below the bottom locking nut. Do not leave 6 inches of excess rod hanging down to poke holes or scrape workers' heads.

Search Field RescueOpen in Q&A search

Plain-English answer

The rod should pass entirely through the nut with a minimum of 2 to 3 full thread pitches exposed below the bottom locking nut. Do not leave 6 inches of excess rod hanging down to poke holes or scrape workers' heads.

Field checklist

Ask Foreman

Hey boss, I’m checking hangers & supports: What's the rule of thumb for how far the all-thread should stick out below the unistrut nut? I found the likely issue and want to verify the next step before I lock it in. Do you want me to adjust it now or check the drawing/detail first?

Open Ask Foreman

Verify before acting

Use this as training guidance. The foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, and AHJ/code requirements always control the final answer.

Related questions

#024 · When building a unistrut trapeze, should the strut open face point up or down?1st Year · Hangers & Supports#021 · How do I calculate how much all-thread rod to cut for a trapeze hanger?1st Year · Hangers & Supports#025 · How do I square up my hanger points off a structural I-beam?1st Year · Hangers & Supports#029 · How do I hang spiral duct using cable hangers (Gripple) instead of strap?1st Year · Hangers & Supports#030 · What's the proper gauge of hanger strap for medium-pressure ductwork?1st Year · Hangers & Supports#023 · How do I use a laser level to establish a perfectly straight hanger line?1st Year · Hangers & Supports

Related Field Rescue routes

What do I do when cutting through reinforcement?Field Rescue · Cutting, Holes, Penetrations & Field FabricationWhat do I do when cutting through liner/vapor barrier incorrectly?Field Rescue · Cutting, Holes, Penetrations & Field FabricationWhat do I do when vapor barrier punctured by hanger rod?Field Rescue · Insulation, Liner, Vapor Barrier & Condensation

Related mistakes & recovery checks

#118 · Hanging a coil section without checking drain pan tilt toward the drain connection3rd Year · Installation#177 · Signing off on controls work that has not been commissioned through a full sequence test4th Year · Systems & Controls#024 · Applying mastic sealant unevenly or missing interior joints entirely1st Year · Sheet Metal Work