Nite Ize S-Biner Stainless Steel #4 (SB4-03-11)
Published · Researched 2026-09-21
2026 lineup note: The S-Biner is Nite Ize's dual-gate S-shaped carabiner line in sizes #1 through #6. This dossier covers the #4 stainless (SB4-03-11) — the large/75-lb version in bare stainless (the #4 also comes in black, SB4-03-01). Family variants: S-Biner SlideLock (locking gates, #2/#3/#4), S-Biner MicroLock, and aluminum versions. Size #4 is the sweet spot for clipping bottles, tools, and keys. NOT for climbing.
Version lineage (2023–2026)
- Long-running: S-Biner stainless #4 — S-shaped dual-gate carabiner, 3.5" × 1.5", 75 lb rating. Design stable for years; packaging refreshed over time.
- 2023–2026: Continued unchanged — sold singly and in 3-packs; SlideLock variant continues as the locking sibling.
- Still a smart buy? Yes — it's the default "how many?" widget carabiner (Backpacker Magazine's line is on the packaging), and the stainless #4 is the camp/picnic standard.
Overview
The S-Biner #4 is the "large" of the stainless S-Biner family: 3.5" × 1.5" of high-quality stainless with two opposing wire gates on the classic S shape, rated to hold 75 lb. The trick is the dual-gate design — clip two things together with two snaps instead of fumbling one gate, and the center bar secures items that can't reach a gate. Campers clip water bottles, headlamps, and tool rolls to pack loops; tradespeople hang paint cans and tools. The standard non-locking version can let small items migrate past a gate (documented REI loss reports), which is exactly why the SlideLock variant exists. At ~1.5 oz it's negligible weight for what it does.
Key Specs
| Spec | Value |
|---|---|
| Dimensions | 3.5" × 1.5" (88 × 39 mm) |
| Weight | 1.5–1.6 oz (43–45 g) (SlideLock #4: 1.09 oz / 31 g) |
| Weight rating | 75 lb (34 kg) |
| Material | Stainless steel, stainless wire gates |
| Sizes in line | #1 (5 lb) → #6 (100 lb); #4 = second-largest standard size |
| SKUs | SB4-03-11 (stainless); SB4-03-01 (black) |
| Warning | NOT for climbing; not for use where disengagement risks injury |
Pricing
- MSRP: $3.49 single (via zbattery.com's MSRP listing).
- Street (Sept 2026, USD): singles ~$4–6 (Brinkmann's $5.59), 3-packs ~$11–14 at REI. Discounted clearance as low as $1.75 (zbattery clearance listing, limited stock).
In the Box
Single S-Biner #4 (or 3-pack SKU at REI). No other accessories.
Warranty
Nite Ize backs products with a "Worry-Free Guarantee" printed on packaging. Exact duration and terms UNVERIFIED — the guarantee covers defects/workmanship; the packaging notes "Designed by Nite Ize in Boulder, CO."
Support & Parts
No parts or replaceable components — the wire gates are integral. Defective units go through Nite Ize support (info@niteize.com; the brand answers customer reviews directly and steers buyers toward the locking SlideLock for key security).
Community Verdict
REI single: 85% of 40 reviewers recommend. Home Depot #4 black: 4.6/5 across 505 reviews, 79% recommend. SportChek: 4.3/5 over 40 reviews. The documented pattern, per REI/Home Depot reviews: the non-locking gates can let small items (pen on an o-ring, keys) work free — one reviewer lost two pens on hikes, another found keys separated in a pocket. Nite Ize's own support reply steers these users to the SlideLock. Users who clip larger items (bottles, baskets, tools) are nearly unanimous: "small but mighty... dual openings makes for fast and easy attachment." Home Depot verified: "needed something to hold 2 pieces of hanging chain together... fits the bill"; "holds tools, paint cans, and bulky items." No fabricated scores.
Images
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Research date: 2026-09-20. Specs 3.5" × 1.5" / 75 lb / SB4-03-11 / UPC 094664007451 via zbattery, Brinkmann's, specshop, watersweet; MSRP $3.49 via zbattery. Re-verify live: current MSRP and whether SlideLock #4 remains the only locking option.
Long-term durability & warranty-claim reality (enrichment — Sept 2026)
The stainless #4 is effectively a forever item: no corrosion (stainless), no coating to wear, and the gates are simple sprung wire. Long-term Home Depot/REI ownership reports are all about the function, not failures — the durable failure mode is user error: small items slipping a non-locked gate, which is design behavior, not breakage. Warranty-claim reality: claims are nearly nonexistent because there's nothing to break; Nite Ize's packaging carries the Worry-Free Guarantee seal, and their support team actively answers retail reviews (REI, SportChek) rather than hiding from complaints.
Version history — year by year (enrichment — Sept 2026)
- 2023: S-Biner #4 stainless continued; SlideLock variant current.
- 2024: Continued; 3-pack SKU (REI 227118) alongside singles.
- 2025: Continued.
- 2026: Continued; Home Depot and SportChek reviews current through Aug 2026; REI 3-pack page active.
Head-to-head vs closest rivals (enrichment — Sept 2026)
- vs Nite Ize S-Biner SlideLock #4: same size/rating, adds independent plastic locking sliders. If you're clipping keys or anything that must not walk off, the SlideLock is the one — standard #4 is fine for bottles/tools. Dossier: covered within this same note.
- vs generic single-gate mini carabiners: the S-Biner's dual gates let you connect two items without removing one — the reason the whole line exists. Single-gates are cheaper per unit; S-Biners win on function.
- vs Leatherman / Spyderco pocket tools with carabiner functions (
/library/gear/repair-tools/leatherman-arc/,/library/gear/repair-tools/spyderco-delica-4/): no direct overlap — but for camp EDC kits, a #4 on a bottle + a folding knife covers the common camp carry better than either alone.
Care & maintenance (enrichment — Sept 2026)
Rinse grit out of the gate pivots; stainless doesn't need oiling but a drop helps in sand. Don't exceed the 75 lb rating (it's stamped on the back for a reason). Not for climbing, hammocks, or anything that holds people — the warning is on every package.
Buying traps (enrichment — Sept 2026)
- Size number ≠ lb rating intuition: #4 = 75 lb, #3 = 25 lb, #5 = 100 lb. Retailers constantly mix #3/#4 listings — verify the package shows "75 lb (34 kg)" for #4.
- SlideLock look-alike: packaging looks similar; the SlideLock has visible plastic sliders on the gates. Buy the right one for your use case.
- Clearance singles: zbattery showed $1.75 clearance with "no returns" — fine for a $2 item, but check it's the stainless #4, not the aluminum version.
- NOT for climbing — repeated on every listing because someone always asks.
Community Verdict — additional voices (enrichment — Sept 2026)
SportChek reviewers: strong 5-star majority with 6 one-star reports mirroring the gate-migration pattern ("hinged clips are not strong enough and things just fall off" — keys). Nite Ize's response there is consistent: they recommend the locking SlideLock and offer product guidance by email. REI's 2026 3-pack reviews keep it simple: "holds keys and water bottle without issue." The Backpacker Magazine pull-quote on retail packaging ("how many?") matches real multi-unit buying — reviewers buy 3-packs and singles repeatedly. No fabricated scores.
Key Specs gap-fill (enrichment — Sept 2026)
Weights: 1.5 oz = 43 g; 1.6 oz = 45 g. 75 lb = 34 kg. Dimensions 3.5 × 1.5 in = 88 × 39 mm. UPC 094664007451.