Whitecap S-4021C
Swivel eye · 3⅜ in overall length
Compact swivelling-eye snap with the smallest ring diameter of these four versions.
Whitecap Marine Snap Hooks: Swivel vs Fixed Eye & Sizes
Whitecap's stainless-steel boat snaps come in both swivelling-eye and fixed-eye styles. The eye connection and overall length affect how they connect to marine straps, lines and hardware, while hook and eye dimensions must suit the attachment points. This guide compares four exact Whitecap part numbers without treating similarly sized snaps as interchangeable.
What to check before replacing a marine snap
Swivel or fixed eyeS-4021C, S-4022C and S-4023C have a swivelling eye that can turn relative to the hook. S-4033C has a fixed eye. The connection style can matter for twisting lines and straps.
Eye and hook dimensionsThe eye diameter and listed hook size are separate dimensions. Check the ring, strap, eye bolt or other actual connection and make sure the snap gate can open and close fully.
Overall lengthThese snaps measure from 3¼ to 4¾ inches long. Match the replacement to the original installation where overall reach and clearance matter.
Do not infer a safe working load from stainless steel alone. Whitecap identifies these parts as 316 stainless steel, but a rated working load and suitability for lifelines, lifting people, anchoring or critical safety applications have not been established for these exact MPNs. Use manufacturer-approved, appropriately rated hardware wherever a load or safety rating is required.
Whitecap snap hook sizes and eye styles
The values shown are the published product identifiers and dimensions. A hook's listed size is not a substitute for checking the actual gate opening and mating attachment point.
| MPN | Eye style | Length | Eye diameter | Hook size | Product |
|---|---|---|---|---|---|
| S-4021C | Swivel eye | 3⅜ in | ⅝ in | ⅜ in | View |
| S-4022C | Swivel eye | 4 in | ¾ in | ½ in | View |
| S-4023C | Swivel eye | 4¾ in | ¾ in | 7/16 in | View |
| S-4033C | Fixed eye | 3¼ in | 13/16 in | ½ in | View |
Compare the four Whitecap snaps
Each image links to its exact UsedRVParts listing. Match the original part number, eye style and physical dimensions before ordering.
Whitecap S-4022C
Swivel eye · 4 in overall length
Four-inch swivelling-eye snap with a wider listed hook size than S-4021C.
Whitecap S-4023C
Swivel eye · 4¾ in overall length
Longest version in this comparison, using a three-quarter-inch eye and seven-sixteenths-inch hook size.
Whitecap S-4033C
Fixed eye · 3¼ in overall length
Fixed-eye version, rather than a swivelling eye, with the widest listed eye diameter.
Common questions about snap hooks
Are all four Whitecap snaps swivel-eye models?
No. S-4021C, S-4022C and S-4023C have swivel eyes. S-4033C has a fixed eye.
Are S-4022C and S-4023C the same size?
No. Both have a listed ¾-inch ring diameter, but S-4022C is 4 inches long with a ½-inch hook size, while S-4023C is 4¾ inches long with a 7/16-inch hook size.
Can I substitute the fixed-eye S-4033C for S-4021C?
Not automatically. Their eye styles, listed lengths, ring diameters and hook sizes differ. Compare the original connection and whether rotation is required.
Does 316 stainless mean the snap is rated for a mooring line?
No load rating is established here for these specific hooks. The right hardware must meet the line, attachment and operating load requirements; use an appropriately specified marine fitting.
How can I confirm a new snap will clear a ring or eye bolt?
Check the actual ring diameter, wire thickness, hook's usable opening and gate movement against the existing hardware. Overall length alone is not enough to establish fit.
Related boat snap hardware
Also comparing marine snap hardware? See Identify Sea-Dog Brass and Stainless Boat Snaps by MPN for a different manufacturer's reference. Match individual MPNs rather than assuming parts cross over.
Inspect spring gates, corrosion, deformation and wear before each use. Replace damaged hardware with suitable, manufacturer-approved components.
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