How open is too open for an S-hook?

The CPSC handbook treats an S-hook as an entanglement hazard unless it is closed, with no gap or space greater than 0.04 inch, roughly the thickness of a dime. In the field, if you can slide a dime into the gap, close it or replace it. Repeatedly re-crimping the same hook work hardens the steel and it will eventually crack.

How often do swing bearings need replacing?

There is no universal interval. Sealed bearing hangers on a busy public swing commonly last several years, bushing style hangers considerably less. Replace on condition, not on date: audible squeal, visible side to side play at the hanger, an oval wear pattern in the hook eye, or metal dust on the beam under the hanger all mean the bearing is done.

What tools do I need for tamper resistant playground fasteners?

Whatever matches what is on your site, which is why you check before you need it. Common types are pin in hex, pin in six lobe, one way screws and clutch head, plus proprietary shear nuts on some structures. Buy the bit set when the equipment is installed and keep it in the same box as the spares, not in a personal toolbox.

Is it safe to replace playground hardware with parts from a hardware store?

Generally no. Playground hardware is specified for load, corrosion resistance, head profile and entanglement geometry, and a standard hex bolt with a projecting thread creates a protrusion hazard a purpose made fastener does not. Use the equipment manufacturer's parts or a documented equivalent, and record what you fitted.

Playground hardware, fasteners and wear parts

Failure happens at the joints

Decks rarely snap. Posts rarely bend. What fails on a playground is the connection: a hook that opened, a bearing that seized, a bolt that backed out, a cap that fell off and left a thread standing proud. Those parts are cheap, they wear on a predictable curve, and they are visible to anybody who looks.

This page is the detailed tier's shopping list. The playground inspection schedule says when to look; this says what to look at and what number means replace.

S-hooks and connectors

The S-hook is the most inspected part on any playground, and with reason: it holds the seat to the chain, it is exposed, and an open hook catches clothing, hair and drawstrings.

Closure. The handbook's entanglement criteria require S-hooks and connectors to be closed, with no gap or space greater than 0.04 inch, about the thickness of a dime¹. Carry a dime. If it slides into the gap, the hook fails.

Wear. Look at where the hook bears on the hanger eye and on the chain link. The hook wears to a flat, then to a crescent. Once the cross section is visibly reduced at the bearing point, replace it, and replace both hooks on a seat at the same time so wear stays even.

Crimping. Close a new hook once, with the right tool, and do not reopen it. A hook that has been crimped, opened and re-crimped is scrap.

Rapid links and quick links are a common field substitute. They are acceptable only if they close fully, have no gap over the entanglement threshold, and are rated for the load. Half of the ones found on playgrounds are hand tight, which means they are working themselves open. Swing safety covers the rest of the swing assembly.

Swing hangers, bearings and chain

Part	What to check	Replace when
Hanger bearing	Noise, side play, free rotation	Audible squeal or any lateral play
Hanger clevis or eye	Oval wear at the hook contact point	Wear visible as a flat or notch
Chain link	Wear at link contact, elongation	Past the manual's wear limit, or any cracked link
S-hook	Closure gap, cross section	Gap over 0.04 in, or a worn flat
Seat	Splits, exposed insert, rivet wear	Any split, any exposed reinforcement

Swing assembly wear points and their replace triggers. Where the equipment manufacturer's manual gives a specific wear limit, that figure wins.

Bearings. Sealed bearing hangers run quiet and last; bushing style hangers wear faster and announce it. Replace on condition rather than on a calendar. A hanger with lateral play transfers load unevenly into the beam and accelerates every other wear point on that swing.

Chain wear and stretch. Chain wears where link touches link, and the contact faces flatten. Chain also appears to stretch, which is really the same wear expressed as length. Two practical checks: lay the two chains from one seat side by side and look for a length difference, and sight down a chain for a link whose cross section has thinned. Uneven seat height is a wear signal, not a setup problem. Follow the equipment manual's wear limit for the final call.

Coated chain. Plastic coated chain protects hands from pinching and heat, but it hides wear. When the coating splits, water sits against steel inside it. Split coating means inspect underneath, not tape over it.

Shackles, clevis pins and rope connections

Net and rope structures, tire swings and some spinning equipment use shackles, clevis pins and swivels instead of S-hooks. They fail differently.

Shackles loosen. The pin backs out under cyclic load unless it is secured with a cotter pin, a lock nut or thread locker. Check that the securing element is present, not just that the shackle looks closed.
Clevis pins wear on the shear plane and the wear is invisible from outside. If there is rotational play, pull the pin and look.
Swivels on tire swings and rope elements are load bearing and they seize. A seized swivel converts twist into torque on the chain and the beam.
Rope terminations at ferrules and thimbles fray from the inside out. Any broken strand at a termination takes the element out of service. See net and rope play for rope condition limits.

Bolts, thread engagement and torque

Three failures cover nearly everything.

Backing out. Vibration and thermal cycling walk fasteners loose. The fix is correct torque plus a locking element: a nylon insert nut, a locking patch, or thread locking compound of the grade the manufacturer specifies. Do not use a permanent grade compound on anything you will ever need to remove.

Insufficient thread engagement. A bolt needs enough thread through the nut to carry load, and a field repair with a too short bolt is a common finding. Equally, a bolt that is too long leaves threads standing proud, which is a protrusion hazard and a snag point. Cut and cap, or fit the right length. Protrusion and entanglement explains the threshold.

Over torque. Crushing a plastic component or stripping a thread in wood or in a thin wall tube creates a joint that will never hold again. Use a torque wrench and the manufacturer's figure. Where no figure exists, torque to the fastener grade and material, and write down what you used.

Wood structures move seasonally and need a torque check at least twice a year, typically spring and fall. Materials: steel, wood and plastic covers how each substrate behaves under a fastener.

Tamper resistant fasteners and the tools for them

Public sites use tamper resistant hardware to stop casual disassembly. It works until your crew needs a bit and does not have one, at which point the repair waits a week and the structure stays closed.

Common families are pin in hex, pin in six lobe, one way screws, clutch head, and proprietary shear or break away nuts. Rules that keep this from becoming a problem:

Get the bit set at installation, in writing, as part of the handover.
Keep one set with the spares kit and one spare set elsewhere.
Record which fastener family each structure uses in your equipment inventory.
Never substitute a standard fastener for a tamper resistant one, because it becomes the one everyone removes.

Theft and deliberate loosening are real on some sites. Patterns of missing hardware belong in the record, because they change inspection frequency. See vandalism and repairs.

Plastic caps, covers and the small stuff

Bolt caps and covers are trivially cheap and they do a real job: they cover thread ends, soften edges and stop entanglement. They also pop off constantly, under UV, under cold, and under fingers.

Keep a bag of every size used on site. Replace them the day they go missing, not at the next detailed inspection, because a missing cap over a projecting bolt is an immediate hazard rather than a scheduled one. Where caps go missing repeatedly at the same spot, switch to a bonded or mechanically retained cap.

Corrosion, and what coastal sites do differently

Salt air accelerates everything. Two mechanisms matter.

General corrosion attacks coatings, welds and fastener heads. Once the zinc or powder coat is breached, rust works under the coating from the damaged point outward. Touch up breaches early with the specified repair coating.

Galvanic corrosion happens when two different metals sit in contact in the presence of moisture and salt: a stainless fastener through a galvanized bracket, or an aluminum component bolted to steel. The less noble metal corrodes fast, often invisibly, inside the joint. On coastal sites, keep fastener metals consistent with the component they pass through, use isolating washers where a mix is unavoidable, and shorten the detailed inspection interval for anything within about a mile of surf.

The spares kit

Stocking parts turns a week long closure into a twenty minute repair. For one composite structure with a swing bay, expect roughly $150 to $600 to stock the kit at 2026 US prices, most of it in seats and hangers.

S-hooks in the sizes used on site, plus the crimping tool
One spare belt seat and one full bucket seat, with hardware
A spare swing hanger assembly
A short length of matching chain and the chain tool
Plastic caps and covers in every size on site
Common bolts, nuts and washers in the site's fastener family and finish
The tamper resistant bit set
Thread locking compound in the specified grade
Touch up coating that matches the equipment finish
A calibrated torque wrench

Order parts from the equipment manufacturer or a documented equivalent, and log what you fitted and when. For home playsets, the equivalent list and the sourcing problem sit on repairs and replacement parts.

What to do next

Walk your swings this week with a dime and a ladder, because S-hooks and hangers carry more risk per dollar than anything else on the site. Then build the spares kit, which is the cheapest reduction in downtime available to you. Findings that keep recurring belong in the annual comprehensive audit report, and the quick visual version of these checks belongs on your daily and weekly checks route.

Hardware, fasteners and wear parts