What Is a Lobster Clasp
Definition
A lobster clasp is a mechanical jewelry closure used to open and securely fasten necklaces, bracelets, and other jewelry pieces. It features a spring-loaded lever that opens a hinged arm and automatically closes when released.
Lobster clasps are valued for their security, durability, and ease of use, making them one of the most commonly used clasps in modern jewelry making.
Basic Structure
A lobster clasp consists of the following core components:
Clasp body The main outer shell that houses the internal spring mechanism.
Spring-loaded lever A small external trigger that opens the clasp when pressed.
Hinged arm (jaw) Opens to allow attachment and closes automatically to secure the connection.
Attachment loop A fixed loop used to connect the clasp to the jewelry assembly, typically via a jump ring.
These elements work together to create a self-closing, secure fastening mechanism.
How a Lobster Clasp Functions
When the lever is pressed:
The internal spring compresses
The hinged arm opens
The clasp can be attached to a ring or chain end
When the lever is released, the spring returns the arm to the closed position, securing the connection.
This automatic closing action reduces the risk of accidental opening during wear.
Size and Measurement Standards
Lobster clasps are commonly measured by their overall length, typically expressed in millimeters (mm).
Measurement includes the clasp body but excludes any attached jump rings
Larger clasps generally provide greater strength and durability
Smaller clasps are used for lightweight or delicate designs
Size selection should be based on both aesthetic proportion and functional load.
Functional Considerations
Key functional factors when selecting a lobster clasp include:
Security The spring mechanism provides a reliable closure under normal wear conditions.
Strength Influenced by clasp size, material, and internal construction.
Usability Larger clasps are easier to operate, especially for users with limited dexterity.
Compatibility The clasp must interface correctly with jump rings, chain links, or end components.
A lobster clasp should be chosen based on use case, not appearance alone.
Common Use Cases
Lobster clasps are commonly used for:
Necklaces
Bracelets
Anklets
Jewelry pieces requiring frequent opening and closing
They are particularly suitable for designs that prioritize security and durability.
Lobster Clasps in the ONESIKA System
Within the ONESIKA product system, lobster clasps are classified according to functional strength and intended use, ensuring consistent performance across designs.
Structural Categories
ONESIKA organizes lobster clasps into functional categories based on size, construction, and load capacity:
Fine Intended for lightweight jewelry and delicate chains where minimal load is expected.
Standard Designed for general-purpose use, balancing durability and ease of operation.
Strong Used in heavier jewelry or designs requiring additional security.
Heavy Intended for high-stress applications where maximum strength and reliability are essential.
These categories allow makers to select clasps based on performance requirements rather than size alone.
System Integration
Lobster clasps are typically connected using jump rings selected from the same structural category
Size and strength consistency is maintained across compatible components
Clasps are designed to function predictably within the broader ONESIKA components system
Product-specific details are provided on individual product pages.
Notes
Lobster clasps are closure components, not decorative focal elements
Security depends on spring quality and structural integrity
Proper pairing with appropriately sized jump rings is essential
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