ZUNAH
ZHENGCHEN
ZUNAH
Large-headed Stoppers. Best for receiving work pieces on large surfaces.
Head color
| UNAH | Urethane (Black) | Shore A90 | 4137 Alloy Steel | 10.9 | Trivalent Chromate | SS400 | Trivalent Chromate |
| UNAHH | Urethane (Blue) | Shore A70 | 10.9 | Trivalent Chromate | |||
| SLUNA | Low Repulsion Urethane (Gray) | Shore A70 | 304 Stainless Steel | - | - | 304 Stainless Steel | - |

| Type | Stopper | Screw | [ A ]Accessories (Hex Nut) | ||||
| [ M ]Material | [ H ]Hardness | [ M ]Material | *Strength Class | [ S ]Surface Treatment | [ M ]Material | [ S ]Surface Treatment | |
| ZUNAH | Urethane (Black) | Shore A90 | 4137 Alloy Steel | 10.9 | Trivalent Chromate | 1018 Carbon Steel | Trivalent Chromate |
| ZUNAHH | Urethane (Blue) | Shore A70 | 10.9 | Trivalent Chromate | |||
| ZSLUNA | Low Repulsion Urethane (Gray) | Shore A70 | 304 Stainless Steel | - | - | 304 Stainless Steel | - |
| Part Number | - | L |
| ZUNAH4 | - | 20 |
| Part Number | L | t | D | A | d | B | H | ℓ | m | ||||||||||||||||||
| Type | M (Coarse) | UNAH, SLUNA | UNAHH | ||||||||||||||||||||||||
ZUNAH ZUNAHH | 3 | 10 | 15 | 10 | 15 | 3 | 7.5 | 5.5 | 3.3 | 2.5 | 6 | Full Thread | 1.8 | ||||||||||||||
| 4 | 10 | 15 | 20 | (*25) | (*30) | 10 | 15 | 20 | *25 | *30 | 10 | 7 | 4.2 | 3 | 7 | 22 | 2.4 | ||||||||||
| 5 | 10 | 15 | 20 | 25 | *30 | (*40) | 15 | 20 | 25 | *30 | *40 | 4 | 12.5 | 8.5 | 5.5 | 4 | 9 | 24 | 3.2 | ||||||||
| 6 | 10 | 15 | 20 | 25 | 30 | *40 | (*50) | 15 | 20 | 25 | 30 | *40 | *50 | 15 | 10 | 6 | 5 | 10 | 26 | 3.6 | |||||||
| 8 | 10 | 15 | 20 | 25 | 30 | *40 | *50 | (*60) | 25 | 30 | *40 | *50 | *60 | 5 | 20 | 13 | 7.3 | 6 | 13 | 30 | 5 | ||||||
| 10 | 10 | 15 | 20 | 25 | 30 | 40 | *50 | (*60) | (*70) | 30 | 40 | *50 | *60 | *70 | 25 | 16 | 10 | 8 | 15 | 34 | 6 | ||||||
| 12 | 15 | 20 | 25 | 30 | 40 | 6 | 30 | 18 | 13 | 10 | 18 | Full Thread | 7 | ||||||||||||||
| 16 | 20 | 25 | 30 | 40 | 40 | 24 | 17 | 14 | 22 | Full Thread | 10 | ||||||||||||||||
Frequently asked questions about this product (FAQ)
1. Did it fall off without a few collisions? Is it a quality issue?
The stopper is sintered on the bolt and can absorb the impact force from the front, but when the force point is too inclined towards the side, it is relatively easier to fall off.
2. Will there be any small burrs on the surface after arrival that will affect the use?
It does not affect use. This product is formed by one-time injection molding, and there may be small burrs after molding, but it does not affect use. If there are special requirements for appearance, you can request special production from Mismi customer service.
3. What is the service life of polyurethane gaskets compared to rubber materials?
Generally speaking, polyurethane is more excellent in terms of wear resistance and mechanical strength, with a longer service life. However, polyurethane is more sensitive to changes in the usage environment, especially its hydrolysis characteristics, which can shorten its service life.
4. How can polyurethane and resin heads be used differently? What is low rebound polyurethane?
Polyurethane belongs to the category of elastomers and has better cushioning performance than resin. The material of resin is hard and has much higher mechanical strength compared to polyurethane, which can withstand greater impact forces.
The material of low rebound rubber is very special, which can reduce the thermal energy generated by the workpiece after impact
In precision fixture design and machining setups, managing lateral forces without compromising workpiece positioning is a daily reality on the shop floor. Relying on standard detent components for lateral workholding often leads to pin binding, premature wear, and workpiece deflection.
Mold assembly precision directly dictates manufacturing throughput. Minor component failures cause catastrophic tool damage, unacceptable scrap rates, and severe production bottlenecks. Engineers face constant challenges on the floor.
Quick positioning, alignment, indexing, and securing components in sheet metal or thin-walled enclosures presents a strict mechanical limitation. You face insufficient material thickness to support standard threaded hardware.
Specifying the wrong spring plunger often results in micro-misalignments, premature component wear, or catastrophic part ejection failures during high-speed machining and automation cycles.
In precision engineering, the reliability of positioning, indexing, and holding mechanisms depends entirely on the point of contact between the plunger and the workpiece.
Component failure in indexing, positioning, or ejecting mechanisms frequently traces back to a single engineering oversight: specifying the wrong material for the operating environment.
The relentless demand for miniaturization in medical devices, aerospace components, and consumer electronics requires mechanical hardware that fits microscopic footprints without sacrificing tactile feedback, holding force, or the ability to facilitate easy positioning and removal of parts.
Precise component positioning in mechanical assemblies dictates the difference between seamless indexing and mechanical binding. A fraction of a millimeter in plunger travel matters. Engineers must control this movement to ensure reliable machine operation.
Specify reliable spring plungers for medical devices. Master sterilization-safe materials, micro-sizing, and custom forces for compliant assemblies.
A push button locking pin is only as reliable as its resistance to the operational environment. High shear strength and positive locking mechanisms fail prematurely if corrosion compromises the internal spindle, spring, or detent balls.
Hardware failure in mission-critical environments carries heavy hidden penalties. A degraded fastener rarely just halts a production line. It actively creates severe safety risks and dangerous compliance liabilities for your entire team.
In heavy-duty industrial and aerospace applications, secure fastening is not optional. A single failure in a quick-release mechanism can trigger severe safety hazards. It can cause costly equipment damage or lead to immediate OSHA compliance violations.
Specifying fastening hardware in load-bearing environments carries incredibly high stakes. Mechanical failure is simply not an option. You rely on these components to hold massive structures and critical machinery together under immense stress.
Specify the wrong dimensions for a push button locking pin, and the assembly either fails to lock entirely or suffers from excessive axial play. This loose tolerance accelerates mechanical wear. The most common point of failure in procurement involves confusing "overall length" and "grip length."
Exacting engineering environments leave absolutely no room for guesswork. A fraction of a millimeter often determines whether an assembly holds under immense pressure or fails catastrophically.
In mission-critical applications—from aerospace rigging to medical structural supports—the failure of a quick-release fastener is not just a maintenance nuisance. It is a system-level vulnerability. Engineers often over-index on static shear strength when evaluating these components.
Industrial engineers often face a frustrating terminology paradox. You might hear procurement teams use hardware terms loosely. They ask for ball lock pins today. They ask for push button pins tomorrow. They assume these represent completely different fastening systems.
In precision industrial environments, every second of assembly time counts. Engineers require reliable, tool-less fastening solutions. You need components built for speed and absolute security. The push button locking pin meets this demand perfectly.
Manual fastening in high-vibration or load-bearing environments often forces a difficult engineering trade-off. Technicians must usually choose between maximum physical security and rapid operational speed. Traditional threaded fasteners require tedious manual tightening.
A push button locking pin acts as a critical failure point in high-load, fast-assembly environments. From aerospace assemblies and line array audio systems to heavy lifting and industrial Lockout/Tagout (LOTO) protocols, these small components carry massive operational stakes.