Mantus Marine
Mantus Anchor Swivel S2
Mantus Anchor Swivel S2
SKU:US2
- 5/16–3/8 in / 8–10 mmChain fit
- 4,340 lb / 1,970 kgWorking load limit
- 316L body + 2507 pinStainless construction
Anchor-to-chain swivel for 5/16–3/8 in (8–10 mm) chain. S2 is normally the appropriate choice for 3/8 in Grade 30 or Grade 40 chain.
See full product details and specificationsCouldn't load pickup availability
- Ships in 1–5 business days
- 30-day returns
- Advice from real cruisers
Mantus Marine Swivel S2 – The Strongest Link in Your Chain
Keep your vessel secure with the Mantus Marine Swivel S2, the connection between your anchor and chain. This marine-grade swivel combines strength, safety, and performance.
The S2 model is engineered for 5/16”–3/8” (8–10 mm) chain and built to be stronger than its corresponding Grade 40 chain. Its innovative integrated swivel shackle design completely eliminates side loading, giving you the confidence that your anchor system can handle any condition.
Crafted from 316L stainless steel with a duplex stainless steel pin, the S2 swivel offers exceptional corrosion resistance and long-lasting durability. Every detail, from the slim hex head bolt to the electro-polished finish, is made to perform flawlessly and look great on your bow.
Technical Specifications
| Fits chain | 5/16" – 3/8" (8–10 mm) |
|---|---|
| Function | Anchor swivel - lets the anchor rotate to come aboard right-side-up and prevents chain twist |
| Material | High-strength stainless steel |
Shipping & lead times
Shipping & lead times
We're a small team of boaters and we pack orders within 1–5 business days (no weekend or holiday packing). You'll get an email with tracking as soon as a label goes on your box.
Specialty items — fire extinguishers (dangerous goods) and low-stock or built-to-order gear — can take longer; the product description will say so. On a tight timeline or meeting your boat somewhere specific? Contact us and we’ll work out the fastest way to get gear to you.
International orders ship DDU: local duties, taxes, and customs fees are the buyer’s responsibility. Full details in our shipping policy.
Returns & refunds
Returns & refunds
30-day returns from the date of purchase. Items must be unused, in the original packaging with all cables and accessories, with proof of purchase.
Contact us before shipping anything back — we’ll send the return form that must accompany your return. Fire extinguisher and lithium battery items carry a $15 administrative fee on returns.
Read the full refund policy.
Ask a cruiser before you buy
Ask a cruiser before you buy
Everyone here is a current or past cruiser — we’ve docked short-handed, re-rigged at anchor, and chased 12V gremlins too. Not sure this is the right fit for your boat? Send us your question before you order and we’ll give you a straight answer.
Mantus swivel sizing and construction
The integrated shackle connects directly to the anchor, avoiding the side loading that can occur when a conventional shackle bears across a swivel eye. The body is precision-cast 316L stainless steel and the oblong chain pin is 2507 duplex stainless steel.
| Model | Chain diameter | Working load limit | Ultimate breaking strength | Included anchor shackle |
|---|---|---|---|---|
| S1 | 1/4–5/16 in (6–8 mm) | 3,000 lb (1,360 kg) | 15,000 lb (6,804 kg) | 7/16 in (11 mm) |
| S2 | 5/16–3/8 in (8–10 mm) | 4,340 lb (1,970 kg) | 21,700 lb (9,843 kg) | 1/2 in (13 mm) |
| S3 | 3/8–1/2 in (10–14 mm) | 7,000 lb (3,175 kg) | 35,000 lb (15,876 kg) | 5/8 in (16 mm) |
Choose by chain grade as well as diameter
For 3/8 in (10 mm) Grade 30 or Grade 40 chain, S2 is normally the appropriate size; S3 is used at that diameter when Grade 70 strength requires it. Oversizing can create bow-roller fit and anchor-setting problems.