4-Leg Chain Sling Setup: Complete Selection & Use Guide-Blog-TOPONE Chain Lifting

Four-leg chain slings rule awkward lifts—transforming a single top master link into four evenly loaded legs that wrap tanks, steel frames, or prefab panels. You gain stability, yet multiplied tension hides risk if grade, diameter, or hook match go wrong. This guide shows how G80 and G100 links compare, walks through angle factors, and lays out a six-move workflow so crews size, inspect, and run a 4-leg sling without guesswork. (146 words)

1 Understand the Load Increase a Fourth Leg Creates

Adding legs spreads weight yet boosts line tension whenever the bridle angle tightens. Use the EN 818-4 factors every time:

Angle Between Any Two Legs	Factor Applied to Load	Result per Leg on 10 t Lift
90° (vertical)	1.00	2.5 t
60°	1.15	2.9 t
45°	1.41	3.5 t
30°	2.00	5.0 t

Smaller angles stiffen the rig and spike tension fast—never go below 45° unless chain, hooks, and master link match the higher factor.

2 Pick the Correct Grade Before Diameter

Chain Grade	Yield MPa	Safety Factor	Proof Load	Typical Finish	Best Field
G80	640	4 : 1	2.5 × WLL	Black / phosphate	Construction, rental yards
G100	980	4 : 1	2.5 × WLL	Black paint	Production cranes, tight headroom
Stainless G80	640	4 : 1	2.5 × WLL	Polished	Food, acid, marine

G100 boosts working-load limit by about 25 % over the same diameter; stainless G80 matches G80 strength yet survives salt and sanitiser.

3 Use the Diameter Matrix to Nail Capacity

Ø mm	G80 WLL per Leg kg	G100 WLL per Leg kg	Sling WLL @60° (4 legs) G80 kg	Sling WLL @60° (4 legs) G100 kg	Chain kg / m	Hook Throat ≥ mm
8	2 000	2 500	6 880	8 600	1.4	13
10	3 150	4 000	10 850	13 800	2.2	17
13	5 300	6 700	18 270	23 230	3.8	22
16	8 000	10 000	27 600	34 500	5.7	28
20	12 500	16 000	43 100	55 200	9.0	34

Table data from lifting-chain.com product sheets.

One-Minute Calculation

1. Write heaviest routine load.

2. Add rigging mass + 10 %.

3. Multiply by 1.15 (60° default for four legs).

4. Find first diameter whose “Sling WLL @60°” ≥ result.

5. Choose hooks with throat ≥ listed minimum.

4 Hook Choices That Speed the Job

Hook Type	Works With	Quick Advantage	Ideal Task
Clevis grab	G80	Leg shortening without tools	Variable pick height
Eye sling	G80 / G100	Smooth throat, full support	Vertical or 2-leg picks
Self-locking	G100	Latch shuts under load	Overhead personnel zones
Foundry	G80 / G100	Wide jaw, no latch	Ladle trunnions, big pins

Always match hook grade to chain grade—mixing downgrades capacity and voids certs.

5 Assemble the Sling—Six Moves to Certainty

6. Thread each leg onto master link tags facing out.

7. Attach shortening clutch (if used) on straight link, not weld.

8. Pin hooks and torque to spec—split-pin retainer must seat.

9. Gauge link diameter; scrap at 10 % wear before first service.

10. Measure five-link pitch; reject at 3 % stretch.

11. Record chain & hook codes in log; store digital certs.

Crews repeat moves 4–6 every 30 days or 500 cycles—whichever hits first.

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Inspection finds wear flats early and stops surprise snaps.

6 Rigging Habits That Extend Sling Life

Lift vertical when possible; angle only when geometry forces it.

Keep legs within ±5° length tolerance; uneven legs overload one corner.

Never choke a chain around sharp plate; use beam clamps or pad eyes.

Oil links after washdown; lube reduces fretting and corrosion.

Hang sling on a rack; coils trap water and kink links near welds.

Follow these habits and G80 lasts four years of daily duty, G100 about three, stainless G80 over five in wet plants.

7 Finish Options vs Field Threats

Finish	Neutral Salt-Spray h	Temp Range °C	Added Mass %	Where It Wins
Black paint	72	−40→200	0	Indoor shops
Phosphate	480	−20→180	0	Dusty yards, mines
70 µm hot-dip zinc	1 000	−10→120	3	Ports, coastal sites
Bare stainless	Unlimited	−196→200	0	Food, acid, brine

Choose finish by environment; zinc adds little weight but blocks rust four-times longer than paint.

Self-locking hooks guard against accidental tip-out on steep bridle angles.

Conclusion

Follow the grade chart, diameter matrix, and six-move assembly flow, then let Topone four-leg chain slings lift bulky loads swiftly and safely—order your custom G80, G100, or stainless set now at lifting-chain.com.

4-Leg Chain Sling Setup: Complete Selection & Use Guide