A man spent a whole day in Idaho trying to break a rope on purpose. Before the first pull, he went up a size on his soft shackles.
That one move answers most of what size soft shackle do I need, and it's the opposite of what people expect. The shackle isn't meant to be the part that gives. It's meant to still be there when everything else has had enough. Get that straight and the rest is three quick checks.
- Check one: the rig doing the pulling. 5/16" for UTVs and two door Jeeps, 7/16" for half ton to one ton trucks, 1/2" for service trucks and small heavy equipment.
- Check two: the line. 5/16" goes with 3/4" kinetic rope, 7/16" with 7/8" and 1", 1/2" with 1-1/4".
- Check three: the point. Murphy's hitch recovery points take soft shackles up to 7/16" and no bigger.
- Published strengths: 37,100 lbs, 45,500 lbs, 62,500 lbs MBS. Working load limit is that divided by five.
- When the three checks disagree, take the bigger answer. That's Rick's rule in the rope test.
- Doubling a Double Loop around a point nearly doubles its strength. The length is the whole reason it exists.
1. The day the rule got said out loud
Idaho. A line-up of trucks getting progressively heavier, a loader as the anchor, and one job for the day: pull a kinetic rope until it lets go. Before anything moves, Rick explains how he's rigged it.
"And we're going larger on our soft shackles than the capacity of the rope, so we don't break soft shackles, cuz we want to break the rope."Wrecker Rick, setting up the durability test, "I Used This Yankum Rope Wrong… I'm Lucky To Be Alive"
He wanted the rope to fail. So he deliberately made sure the shackles wouldn't.
Flip that round and it's your rule too. On a normal recovery you don't want anything to fail, so you size the shackle past the line it's carrying and let the line be the weak point you already understand. Nobody ever stood in a ditch wishing their shackle was smaller.
5/16" at $78.99, 7/16" at $104.99, 1/2" at $145.99. Each one 20" closed and 40" open with a 36" chafe sleeve, so it reaches points a short shackle can't and doubles around one for close to twice the strength.
2. Check one: size to the rig that pulls
This is the one most people get backwards. Yankum state it plainly: "Match your soft shackle to the recovery vehicle, not the stuck vehicle."[2]
Makes sense when you think about where the force comes from. The stuck rig is dead weight. The load in your line is set by what's pulling, how fast it's moving and how hard the mud is holding on. A half ton truck yanking a buried excavator doesn't put excavator-sized loads in the rope. It puts half-ton-truck-sized loads in it, right up until something gives.
Yankum's own weight-class guidance runs like this:[2]
- 5/16" — UTVs, side by sides, two door Jeeps
- 7/16" — full size SUVs, four door Jeeps, half ton to one ton trucks
- 1/2" — overland trucks, vans, service trucks, small heavy equipment
Most people reading this are in the middle line. If you drive a 2500 or a 3500, 7/16" is your default and you can stop worrying about it.
3. Check two: match it to the line
Second check, and it's the one printed on the product page. All three sizes of the Double Loop, with what each one pairs with and what it costs.
| Size | MBS | WLL at 5:1 | Kinetic rope | Winch line | Price |
|---|---|---|---|---|---|
| 5/16" | 37,100 lbs[1] | 7,420 lbs[2] | 3/4" | 5/16" | $78.99 |
| 7/16" | 45,500 lbs[1] | 9,100 lbs[2] | 7/8" and 1" | 3/8" and 7/16" | $104.99 |
| 1/2" | 62,500 lbs[1] | 12,500 lbs[2] | 1-1/4" | 1/2" | $145.99 |
Run Murphy's own kinetic rope through that table and it lands cleanly. The rope is a 1" x 30', 33,500 lbs minimum tensile strength, built for trucks in the 7,200 to 10,249 lb band.[3] One inch rope means the 7/16" shackle, and the shackle's 45,500 lbs sits above the rope's 33,500 lbs. Connector outlives the line. That's the rule from section one, working quietly in the background.
And if you bought the kit rather than the rope on its own, you already own two of them. The Murphys Diesel Recovery Kit ships with two 7/16" soft shackles and two 7/16" slings around that same rope.[5]
4. Sizing to a winch, where the numbers fight
Now an honest complication, because winching brings in a second rule and the two don't always agree.
Yankum's rule for winch work: "Make sure the WLL of your shackle exceeds the line pull rating of your winch."[2] Not the breaking strength. The working load limit, which is the breaking strength divided by five.
So take a 10,000 lb winch, which is what a lot of trucks run. By line diameter you'd reach for the 7/16" shackle, because that's what pairs with 3/8" and 7/16" winch line.[1] But the 7/16" carries a 9,100 lb working load limit,[2] and 9,100 doesn't clear 10,000. The 1/2", at 12,500 lbs, does.
Two rules, two answers. So which one wins?
Take the bigger one, and check it physically fits your line and your points before you buy. That is literally what Rick did in Idaho: the numbers said he'd probably be fine, and he went up anyway because the cost of being wrong was a piece of hardware moving at speed.
5. What doubling it up buys you
The Double Loop is twice the length of a normal soft shackle, and the length isn't for reach alone. Loop it around the connection point rather than straight through, and the page says that "will nearly double the strength of the soft shackle."[1] Two legs carrying the load instead of one.
That's the move Rick makes a few minutes into the rope test, and the way he explains it is the whole philosophy in one sentence.
"I'm going to double up my shackles here just to be on the safe side. I don't think we have a problem. I think the one shackle will take it, but better to have it not need it than need it not have it."Wrecker Rick, mid-test, "I Used This Yankum Rope Wrong… I'm Lucky To Be Alive"
He already believed the single shackle was enough. He doubled it anyway. Thirty seconds of work against a failure nobody wants to be standing near.
The other half of that length is reach. Forty inches open gets you under a sunk rig to a frame rail you can actually see but can't quite get to with a short link, which is exactly the situation where people start hooking to something they shouldn't.
6. Check three: will it fit your hitch point?
Third check, and it's the one that catches people after the money's spent.
A soft shackle has to physically pass through the recovery point without chewing itself up on the edges. Murphy's hitch receiver recovery points are cut for that, with a stated limit. Both the 2" version and the 2.5" Class V version say they're "designed to also accept Yankum soft shackles up to 7/16" without chaffing."[4]
Up to 7/16". Not 1/2".
So if section four talked you into a 1/2" for the winch, keep a 7/16" in the bag for the hitch point. That's not a problem, it's just a thing to know before you're lying in the mud finding it out. Most working bags have a couple of sizes in them for exactly this reason.
5/16", 7/16" or 1/2". Twice the length of a standard shackle, so it reaches further and doubles around a point.
1" x 30', 33,500 lbs minimum tensile strength, for 3/4 to 1 ton trucks. The 7/16" shackle is its match.
The 1" x 30' rope, two 7/16" heavy duty slings, two 7/16" soft shackles and a medium roll-top bag.
Takes soft shackles up to 7/16" without chafing. WLL 13,200 lbs at a 5:1 factor of safety.
7. Rig it safe
Sizing right is only half of it. These come from a recovery-safety source that sells no competing gear, and from the product pages.
- Work to the WLL, not the breaking strength. The working load limit is the breaking strength at a 5:1 factor.[2]
- Never join two ropes with a shackle. "If the shackle breaks, it can fly like a bullet and cause serious injury."[6]
- Never onto a tow ball or bumper hitch. "These are not rated for recovery and can break off under load."[6]
- Pull in line with the hitch. A side pull may damage the shackle or receiver, or tip the vehicle.[4]
- Do not exceed the posted ratings, and remember the pin can shear before the tow point itself fails.[4]
- Inspect before you rig. Fraying, cuts or stiff sections mean that shackle is done.[2]
- Dampener over the line, and everybody stands back further than the line is long.[6]
Sources: [6] BFGoodrich, Recovery Techniques · [2] Yankum soft shackle page · [4] Hitch Receiver Recovery Point pages
Three checks, then. The rig that pulls, the line it carries, the point it has to fit. Run all three and they'll usually agree on 7/16" for a pickup. When they don't agree, go up, the way a man does when he's trying to break something and doesn't want any surprises about which part.
Sources
- "Double Loop" Soft Shackle product page, fetched live 2026-09-19. Minimum breaking strengths by diameter, the rope and winch line pairings, the 20"/40" lengths, the doubling note and the three sizes and prices are read from this page. murphysdiesel.com/products/double-loop-soft-shackle
- Yankum Ropes, soft shackle product page, fetched live 2026-09-19. The "match to the recovery vehicle" rule, the vehicle weight classes, the per-diameter working load limits, the MBS and WLL definitions at 5:1, the winch line pull rule and the replacement criteria are quoted from this page. yankum.com/products/soft-shackle
- Murphys Diesel Recovery Rope product page, fetched live 2026-09-19. The 1" x 30' dimensions, the 33,500 lbs minimum tensile strength and the 7,200 to 10,249 lb vehicle band are read from this page. murphysdiesel.com/products/murphys-diesel-recovery-rope
- 2" and 2 1/2" Hitch Receiver Recovery Point product pages, fetched live 2026-09-19. The 7/16" soft shackle limit, the working load limits and the pull-in-line, no-side-pull and pin-shear warnings are read from these pages. murphysdiesel.com/products/2-hitch-receiver-recovery-point
- Murphys Diesel Recovery Kit product page, fetched live 2026-09-19. The kit contents, including two 7/16" soft shackles and two 7/16" heavy duty slings, are read from this page. murphysdiesel.com/products/murphys-diesel-recovery-kit
- BFGoodrich, "4x4 Driving Guide: Recovery Techniques," fetched live 2026-09-19. The shackle-joining warning, the tow ball warning, the dampener step and the stand-back rule are verbatim from this page. bfgoodrichtires.com/auto/learn/4x4-driving-guide/recovery-techniques