Field notes · Dropped object prevention
Drop Hazard Safety
Practical guidance on keeping overhead hardware captive — crane maintenance, DROPS programs, and tethered fastener engineering.
Domestic Fastener Sourcing: What "Made in the USA" Actually Buys You
Imported commodity hardware is often the right call. The domestic argument gets serious when the part is custom, low-volume, safety-relevant, or ca...
Read articleANSI/ISEA 121 Explained — and the Hardware It Doesn't Cover
ANSI/ISEA 121 governs anchor attachments, tool attachments, tethers and containers. Installed fasteners sit outside that scope — here's what that m...
Read articleCaptive Fasteners Explained: Captive Screws, Captive Hardware and What Actually Stays Put
Captive by geometry or captive by tether? Retaining rings and shoulders work when you control the panel design. Overhead structural hardware needs ...
Read articleWhy Bolts Back Out: Vibration, Load Cycling and Self-Loosening
A bolted joint fails two different ways, and most fixes only address one. How preload loss and rotational self-loosening actually work — and why lo...
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Dropped Objects Toolbox Talk: A 10-Minute Script for Crews Working at Height
A ready-to-deliver 10-minute toolbox talk on dropped objects for crane and overhead-equipment crews — statistics, a physical demonstration, and the...
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Wedge Lock Washers: What They Solve — and the Drop Risk They Don't
Wedge lock washers beat vibration loosening better than almost anything — but a locking device is not drop prevention. Where they excel, where they...
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Crane Inspection Checklist: Daily, Frequent, and Periodic — With the Hardware Items Most Lists Miss
A working crane inspection checklist built on OSHA 1910.179's daily, frequent, and periodic intervals — with the loose-hardware pass most checklist...
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Overhead Crane Safety: An Inspection Routine That Catches Loose Hardware
Standard crane inspections focus on hooks, ropes, and brakes. Loose fasteners cause drops between inspections. Here's a hardware-focused routine th...
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The DROPS Calculator: How Much Damage Can a Falling Bolt Really Do?
The DROPS calculator turns object weight and fall height into predicted consequence. Here's how to read it — and what it says about ordinary crane ...
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Safety Wire vs. Tethered Bolts: Choosing Secondary Retention That Holds Up
Safety wire, thread lockers, lock nuts, and tethered bolts all fight loosening — but only some of them stop a drop. How to choose secondary retenti...
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Struck-By Hazards: The Numbers Behind Falling Object Injuries
Struck-by incidents are one of OSHA's Fatal Four. Here's what the data says about falling object injuries across construction, energy, and industri...
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Dropped Object Prevention: A Practical Guide for Work at Height
A practical, hierarchy-of-controls approach to dropped object prevention on overhead and mobile cranes — from engineering out the drop to inspectio...
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