Security Chain Buying Guide 2026: Case-Hardened vs. Standard Chain

Buying the wrong chain doesn't just waste money. It puts your load, your equipment, or your crew at risk. When you're shopping for chain, the options look similar on paper — until you understand what actually separates a chain that holds from one that fails when it counts.

This guide covers the real differences between case-hardened and standard chain, where each type belongs, and how to match the right grade to the job.

What "Case-Hardened" Actually Means

Case hardening is a heat treatment process that creates a hard outer shell on each link while keeping the core tough and ductile. The result: a chain that resists cutting, grinding, and bolt-cutter attacks far better than untreated chain.

Standard chain is either left in its as-manufactured state or through-hardened, meaning the hardness runs consistent throughout the material. Through-hardened chain can actually be more brittle under lateral force than case-hardened chain, which stays flexible at its core.

For security applications, case-hardened chain is the right call. For load securing and transport, chain grade and working load limit matter more than surface hardness.

Chain Grades Explained

Grade determines working load limit. Here's how the grades stack up:

Grade 30 (Proof Coil)

General-purpose chain with low working load limits. Not rated for overhead lifting or cargo securement on commercial vehicles. Fine for fencing or non-critical tie-offs — nothing more.

Grade 43 (High Test)

Stronger than Grade 30. Common in logging and agricultural work. Still not DOT-approved for tiedown on commercial vehicles in most configurations.

Grade 70 (Transport Chain)

The DOT-recognized standard for cargo securement on flatbeds and auto haulers. Vulcan's 5/16-inch G70 transport chain is rated at 4,700 lb SWL. This is the grade you use to hold vehicles and freight on a trailer. The distinctive gold or yellow chromate finish makes it easy to identify in the field.

Grade 80 (Alloy Chain)

Engineered for overhead lifting. Higher tensile strength than G70. Used in chain slings, hoists, and rigging applications where a rated, marked sling is required. Not interchangeable with G70 for transport securement.

Grade 100 / G120

Higher strength-to-weight ratio than Grade 80. Used in demanding lifting applications where you need rated capacity without the added weight.

Case-Hardened vs. Standard Chain: The Practical Difference

The bottom line: case-hardened chain is for locking things down against human interference. Transport and lifting chain is for holding loads against physical force during movement or overhead work. They solve different problems. Don't substitute one for the other.

Where Each Type Belongs

When to Use Case-Hardened Chain

Use case-hardened chain when your primary threat is a bolt cutter or angle grinder. Common applications:

• Securing equipment at a job site overnight
• Locking trailers, gates, or storage containers
• Motorcycle and ATV security
• Yard and lot security for tow operators

Pair it with a quality disc lock or closed-shackle padlock. The chain is only as strong as the lock securing it — most standard padlock shackles are easier to cut than the chain itself.

When to Use Transport Chain (G70)

G70 is what you run to secure vehicles on a car hauler or flatbed. It meets DOT requirements for tiedown on commercial vehicles. Pair it with the right load binder to tension the chain properly. Vulcan's ratchet-style load binder is rated 7,100 lb SWL and compatible with 5/16-inch or 3/8-inch Grade 70 chain. You get controlled tensioning without the snap-back risk of a lever binder.

When to Use Grade 80 or G120 Chain

Rigging and lifting require Grade 80 or G120 chain slings with rated and marked specifications. Using G70 transport chain for overhead lifting is a serious safety violation — the grades are not interchangeable for lifting. Any rigger who can't produce a rated, marked sling is creating real certification and liability exposure on the job.

Choosing the Right Lock for Security Chain

The chain is only part of the system. For security applications, the lock matters just as much.

Disc locks have a short shackle that leaves almost no room for bolt cutter jaws. They're the hardest to defeat with hand tools and pair well with case-hardened chain on motorcycles and equipment.

Closed-shackle padlocks expose minimal shackle, making them harder to cut than standard open-shackle designs. Look for hardened steel bodies and anti-pick cylinders.

Shrouded shackle padlocks have a body that partially covers the shackle — solid for gate and container security where the lock takes weather and opportunistic attack.

Don't run a standard open-shackle padlock on case-hardened chain. The shackle becomes the weak point, and you've spent money on quality chain only to leave an easy target.

Chain Diameter and Working Load Limit

Bigger diameter means more strength, more weight, and less flexibility. For transport work, match your chain diameter to your load binder's compatibility range.

For security, thicker chain takes longer to cut. A 3/8-inch case-hardened chain is significantly harder to defeat with a portable angle grinder than 1/4-inch chain — even if both carry the same hardness rating.

Common Mistakes When Buying Chain

Mixing grades. Grabbing G30 because it was on sale, then expecting it to hold a 4,000 lb vehicle on a trailer, is how loads end up on the road.

Using unrated chain for lifting. Any chain used overhead must be rated and marked. No exceptions. No grade stamp and no working load limit means it doesn't belong on a hoist.

Trusting "heavy duty" marketing. That phrase means nothing. Look for the grade stamp and the SWL or WLL on the product listing or the chain itself.

Skimping on the lock. Case-hardened chain with a cheap padlock is a false sense of security. The system fails at its weakest point.

What to Check Before You Order

Whether you're buying transport chain for a car hauler or security chain for a job site, verify these before you add to cart:

• Grade designation (G30, G43, G70, G80, G120)
• Working load limit stated in pounds
• Chain diameter and compatible hardware (hooks, binders, locks)
• Finish (yellow chromate for G70 identification, black oxide for security chain)
• Certification markings on any chain used in lifting applications

Vulcan Brands carries car hauler chains and a full range of tow chains for transport work, along with the load binders and hooks to complete the system. Every order ships free — no minimum, no exceptions. Browse the full catalog at vulcanbrands.com.

FAQs

What is the difference between case-hardened chain and Grade 70 transport chain? Case-hardened chain is built to resist cutting and is used for security — locking equipment, trailers, or gates. Grade 70 transport chain is rated for cargo securement on commercial vehicles and meets DOT requirements. Different purposes, not interchangeable.

Can I use case-hardened chain to secure a load on a flatbed trailer? No. Case-hardened chain doesn't carry a DOT-approved working load limit for cargo securement. For flatbed and auto hauler work, use Grade 70 transport chain with a rated load binder.

What chain grade do I need for overhead lifting? Grade 80 or G120 chain slings. Grade 70 transport chain is not approved for lifting. Any chain used in a rigging application must be rated, marked, and meet applicable ASME or OSHA standards.

How do I choose between a lever binder and a ratchet binder? Ratchet binders give you controlled, incremental tensioning and are generally safer to release under load. Lever binders apply tension faster but can snap back hard if released wrong. For operators working alone or newer to chain securement, ratchet binders are the more forgiving option.

What lock works best with case-hardened security chain? A disc lock or closed-shackle padlock with a hardened steel body. Minimize exposed shackle — that's typically the easiest point to attack with bolt cutters. Skip the standard open-shackle padlock.

Does chain diameter affect security performance? Yes. Larger diameter chain takes more time and effort to cut regardless of hardness. For high-value applications, 3/8-inch or larger case-hardened chain provides meaningfully better resistance than thinner options.

Where can I buy Grade 70 transport chain and load binders together? Vulcan Brands carries G70 transport chain, ratchet load binders, and car hauler chains in one catalog with free shipping on every order. Find the full selection at vulcanbrands.com.

Know your grade, match your hardware, and don't cut corners on the lock. The right chain is the one rated for what you're actually doing with it.