Specifications
|
Parameter |
Specification |
|---|---|
|
Standard |
DIN EN ISO 8750 |
|
Pin Type |
Coiled Spring Pin, Standard Duty |
|
Nominal Diameter (d) |
0.8–20 mm |
|
Length (L) |
According to ISO 8750; customized lengths available |
|
Length Tolerance |
L ≤ 10 mm: ±0.25 mm; 10–50 mm: ±0.5 mm; 50–200 mm: ±0.75 mm |
|
Materials |
Steel, Austenitic Stainless Steel, Martensitic Stainless Steel |
|
Surface Condition |
Plain / Natural Finish with Protective Lubricant |
|
Minimum Double Shear Strength |
0.4–250 kN, depending on diameter and material |
|
Recommended Hole Tolerance |
H12 |
|
Customization |
Non-standard lengths, materials, and surface treatments |
Radial Force & Retention Performance
ISO 8750 coiled spring pins feature a multi-layer coiled structure that compresses during installation and generates radial force against the hole wall. This elastic response helps retain the pin in the mating component while accommodating normal variations in hole diameter within the specified fit requirements.
- Radial Force Generation: The coiled structure compresses as the pin enters the hole, creating outward spring pressure that supports secure retention.
- Hole Fit Adaptability: Elastic deformation allows the pin to accommodate specified hole tolerances without relying on a rigid, solid-pin fit.
- Shock & Vibration Resistance: The spring structure helps absorb dynamic loads and resist displacement under suitable operating conditions.
- Retention Stability: Correct pin diameter, hole size, engagement length, and installation quality are essential for achieving consistent retention performance.
Shear Strength & Load-Bearing Capacity
The shear strength of ISO 8750 coiled spring pins is an important consideration when selecting pins for mechanical joints that transmit force between connected components. The required pin diameter and length depend on the applied load, joint configuration, material, and number of shear planes.
- Double Shear Strength: ISO 8750 specifies minimum double shear strength requirements according to nominal diameter and material category. Use the applicable standard table to verify the required value for each pin size.
- Load Distribution: In double-shear joints, the load is transferred across two shear planes. Actual load distribution depends on component alignment, support conditions, and joint geometry.
- Diameter Selection: Larger pin diameters generally provide greater shear capacity, but the mating components must also have sufficient material thickness and bearing strength.
- Application-Based Verification: Check the expected static or dynamic load, pin material, hole fit, and joint design before final selection. Standard shear values should not be treated as allowable working loads without appropriate engineering assessment.
Material & Corrosion Protection Options
|
Material / Surface Condition |
Characteristics & Applications |
|---|---|
|
Carbon Spring Steel |
Provides spring properties and load-bearing performance for general mechanical fastening applications |
|
Austenitic Stainless Steel |
Offers corrosion resistance for equipment exposed to moisture and common industrial environments |
|
Martensitic Stainless Steel |
Can provide higher hardness and strength depending on the specified grade and heat treatment |
|
Plain / Oiled Finish |
Provides a basic surface condition; protective oil may help reduce corrosion during storage and handling |
|
Customized Surface Treatment |
Available subject to material compatibility, required performance, and production specifications |
Custom Coiled Spring Pin Manufacturing
Customized Pin Lengths
Supply non-standard lengths according to engineering drawings and assembly requirements.
Material Selection
Confirm carbon steel or stainless steel options according to required spring performance and environmental conditions.
Drawing-Based Manufacturing
Review customer drawings, nominal dimensions, tolerances, and technical specifications before production.
OEM & Bulk Orders
Support sample confirmation, specification-based production, and customized packaging for distributors and industrial manufacturers.
Quality Inspection & Batch Consistency
Quality control helps ensure ISO 8750 coiled spring pins meet specified dimensional and mechanical requirements across production batches.
- Dimensional Inspection: Check nominal diameter, pin length, and relevant dimensional tolerances against the applicable standard.
- Mechanical Performance Testing: Verify double shear strength according to the specified diameter and material category where required.
- Visual Inspection: Check for cracks, burrs, deformation, and surface defects that may affect installation or product performance.
- Batch Consistency Control: Maintain specification and batch identification records to support traceability and repeat-order consistency, subject to the agreed inspection plan.
FAQ
How do I select the correct diameter and length for an ISO 8750 coiled spring pin?
Selection should be based on the mating hole diameter, component thickness, required engagement length, and expected load. Buyers should also confirm the applicable ISO 8750 dimensional requirements and recommended hole specifications before placing an order.
Can coiled spring pins be used in assemblies subject to vibration?
Yes. Their coiled structure provides flexibility and radial contact with the hole wall, which can help maintain retention under vibration. Actual performance depends on the pin dimensions, hole quality, installation method, and vibration conditions.
Are stainless steel coiled spring pins available for corrosive environments?
Stainless steel options may be available for applications exposed to moisture or certain corrosive environments. The suitable grade should be selected according to the type of exposure, temperature, and required mechanical properties. Stainless steel does not provide the same corrosion resistance in every environment.
Can Anhui Pins manufacture ISO 8750 coiled spring pins to customer drawings?
Yes. Anhui Pins can review customer drawings and technical requirements for customized coiled spring pins. Before production, buyers should confirm dimensions, material grade, tolerances, mechanical requirements, and any specified surface treatment.
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