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Spring Plungers（Screw Type of Pin Plunger：Long Stroke）
A spring plunger is a mechanical device consisting of a pin or plunger enclosed within a housing, with a spring providing force to extend or retract the plunger. When not acted upon, the spring pushes the plunger outward from the housing. Applying external force compresses the spring, allowing the plunger to retract. Once the force is removed, the spring pushes the plunger back out. Some spring plungers have locking mechanisms for added stability. They are widely used in manufacturing for precise positioning, retaining objects in place, aligning components, and providing adjustable force. They can also serve as safety devices by giving feedback or triggering switches. In essence, spring plungers offer a simple yet effective solution for controlling motion and force in various applications. To select a Misumi spring plunger, consult the product specifications for factors such as size, material, spring force, and any additional features required for your specific application needs. Then, use MISUMI's online catalog or contact direct our MISUMI for assistance.
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Specification/Dimensions
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Outer Dia. M(mm)
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Stroke S(mm)
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Tip Material
- Steel
- Stainless Steel
- Plastic
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Body Material
- Steel
- Stainless Steel
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Mounting Method
- Screw-In
- Press Fit
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Initial Load (Range)(N)
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Lock
- Not Provided
- Provided
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Tip Heat Treatment
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Screw Type of Pin Plunger
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Wrench Hole Shape
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Main Body Surface Treatment
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Tip Surface Treatment
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Until 31/03/2025
Until 31/03/2025NBK
Used for oil breakers, knockouts, and positioners. Includes anti-loosening nylon lock.From: ฿ 564.83 Special Price Days to Ship: 
Same day
Same day
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You can add up to 6 items per a category to the compare list.
Long Stroke Plungers (Light Load) HSP-L
KONISHI
Can be used as a press mold component for oil breakers, knockouts, positioners, and so on. Anti-looseness treatment is applied to the screw part.From: ฿ 1,880.52 Days to Ship:
7 Day(s)
7 Day(s)
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You can add up to 6 items per a category to the compare list.
Long Stroke Plungers (Light Load) LSP-L
KONISHI
Use as a press mold component for oil breakers, knockouts, positioners, and so on. Anti-looseness treatment (ALOK) is applied to the screw part.From: ฿ 628.16 Days to Ship:
4 Day(s)
4 Day(s)
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You can add up to 6 items per a category to the compare list.
Long Stroke Plungers (Heavy Load) LSP-H
KONISHI
Use as a press mold component for oil breakers, knockouts, positioners, and so on. Anti-looseness treatment (ALOK) is applied to the screw part.From: ฿ 549.91 Days to Ship:
4 Day(s)
4 Day(s)
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You can add up to 6 items per a category to the compare list.
Long Stroke Plungers (Heavy Load) HSP-H
KONISHI
Use as a press mold component for oil breakers, knockouts, positioners, and so on. Anti-looseness treatment (ALOK) is applied to the screw part.From: ฿ 4,834.29 Days to Ship:
22 Day(s)
22 Day(s)
| Brand |
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| Product Series |
| CAD |
| From |
| Days to Ship |
| Outer Dia. M(mm) |
| Stroke S(mm) |
| Tip Material |
| Body Material |
| Mounting Method |
| Initial Load (Range)(N) |
| Lock |
| Tip Heat Treatment |
| Screw Type of Pin Plunger |
| Wrench Hole Shape |
| Main Body Surface Treatment |
| Tip Surface Treatment |
You can add up to 6 items per a category to the compare list.  Until 31/03/2025 | You can add up to 6 items per a category to the compare list.  | You can add up to 6 items per a category to the compare list.  | You can add up to 6 items per a category to the compare list.  | You can add up to 6 items per a category to the compare list.  | |
| Brand | NBK | KONISHI | KONISHI | KONISHI | KONISHI |
| Product Series | |||||
| CAD |
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| From | ฿ 564.83 Special Price On Sale Until 31/03/2025 | ฿ 1,880.52 | ฿ 628.16 | ฿ 549.91 | ฿ 4,834.29 |
| Days to Ship | Same day | 7 Day(s) | 4 Day(s) | 4 Day(s) | 22 Day(s) |
| Outer Dia. M(mm) | 12 ～ 30 | 10 | 16 ～ 30 | 12 ～ 30 | 16 |
| Stroke S(mm) | 10 ～ 30 | 8 | 10 ～ 30 | 10 ～ 30 | 40 |
| Tip Material | Steel | Steel | Steel | Steel | Steel |
| Body Material | Steel | Steel | Steel | Steel | Steel |
| Mounting Method | Screw-In | Screw-In | Screw-In | Screw-In | Screw-In |
| Initial Load (Range)(N) | 0.01~50 | 0.01~50 | 0.01~50 | 0.01~50 | 0.01~50 |
| Lock | Provided | Provided | Provided | Provided | Provided |
| Tip Heat Treatment | Hardening | Not Provided | Not Provided | Not Provided | Not Provided |
| Screw Type of Pin Plunger | Long Stroke | Long Stroke | Long Stroke | Long Stroke | Long Stroke |
| Wrench Hole Shape | Hex | Hex | Hex | Hex | Hex |
| Main Body Surface Treatment | Black Oxide | Black Oxide | Black Oxide | Black Oxide | Black Oxide |
| Tip Surface Treatment | Black Oxide / Trivalent Chromate | Black Oxide | Trivalent Chromate | Black Oxide | Black Oxide |
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Related Categories to Spring Plungers
FAQ Spring Plungers
- Question: How do spring plungers contribute to the efficiency of injection molding processes?
- Answer: Spring plungers boost injection molding efficiency by securely holding mold components, ensuring precise alignment for consistent results. During setup, they allow quick and effortless adjustment, reducing downtime. Their spring-loaded design maintains component position while enabling easy repositioning, simplifying the process. By streamlining setup and operation, spring plungers enhance productivity in injection molding, benefiting manufacturers by saving time and improving overall efficiency.
- Question: What is the importance of ball plungers in automation?
- Answer: Ball plungers are important in automation because they help things get in the right spot and stay there. Even though they're small, they're super good at making sure parts are in the exact place they need to be. They're used in tools and fixtures to keep stuff secure and move it exactly where it needs to go on the assembly line. Ball plungers are great because they make sure everything runs smoothly and works well, making factories more efficient and products better.
- Question: How is stainless steel utilized in plunger design?
- Answer: Stainless steel is often picked for plungers because it's good at resisting rust and staying strong, even when it's used a lot. It's durable and reliable, which means it lasts a long time without getting damaged, even in tough conditions or when exposed to chemicals that could corrode other materials. That's why it's commonly used in plungers for things like machines in factories, cars, and precision tools, where performance and low maintenance are essential.
- Question: What role do locating, positioning, jigs & fixtures play in plunger technology?
- Answer: Locating, positioning, jigs, and fixtures are super important in plunger technology. Locating mechanisms make sure plungers and workpieces are in the right spot for machining or assembly, reducing mistakes. Positioning devices control how plungers move, so they go exactly where they're supposed to. Jigs and fixtures hold everything in place securely during machining or assembly, which helps prevent errors and makes things work faster and better. Overall, these parts work together to make plunger technology work smoothly and produce high-quality results.
- Question: What are the characteristics of spring plungers with flat tip?
- Answer: Spring plungers with flat tips are versatile tools designed for precise positioning and secure holding of components. Their flat tip ensures even pressure distribution, minimizing the risk of damage to surfaces. These plungers provide strong retention force, securely holding components in place. Some models allow for adjusting the spring tension to customize the holding force. Made from durable materials like steel or stainless steel, they offer longevity and resistance to wear. They are easy to install and replace, making setup and maintenance hassle-free.
- Question: What are the key considerations when selecting materials for plungers?
- Answer: When selecting materials for plungers, consider their strength, durability, and corrosion resistance. Ensure they can withstand operational forces without wearing out quickly. Check if they're resistant to rust and can handle the temperatures they'll encounter. Also, factor in the cost and ease of manufacturing. By evaluating these factors, you can choose materials that meet the needs of your application, providing long-lasting performance without breaking the bank. Ultimately, selecting the right materials ensures reliable and efficient operation of plungers in various industrial settings.
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