Editorial Technical Reference

Strain Relief/Backshell

This page explains how Strain Relief/Backshell is classified within Computer, Electronic and Optical Product Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A protective component that secures cables and prevents mechanical stress at the connection point of an ATE connector.

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Product Specifications

Technical details and manufacturing context for Strain Relief/Backshell

Definition
The strain relief/backshell is a critical component of ATE (Automatic Test Equipment) connectors that provides mechanical protection and cable management. It serves as a housing that encloses the rear portion of the connector, securing the cable bundle and preventing excessive bending, pulling, or twisting forces from being transmitted to the electrical contacts. This ensures reliable signal integrity and prevents connection failures in high-vibration or harsh industrial environments. The component is typically manufactured from aluminum alloy, stainless steel, or thermoplastic, offering a balance of strength, weight, and corrosion resistance. It accommodates cable diameters from 4 to 14 mm and features metric threads ranging from M12 to M40, conforming to DIN EN 60423 for cable glands. The operating temperature range is -40 to 105 °C, and the IP rating varies from IP54 to IP68, depending on the sealing requirements. Pull-out force resistance is specified between 100 and 500 N, and the minimum static bending radius is 5 to 20 mm. Materials used include PA66, nickel-plated brass, and stainless steel 304, with a flame retardant grade of UL 94 V-0. The weight ranges from 10 to 80 g, depending on size and material. These parameters serve as reference ranges; actual values must be verified with the manufacturer for specific models and applications. The strain relief/backshell is essential for maintaining mechanical integrity and signal quality in demanding test environments.
Working Principle
The strain relief/backshell mechanically clamps or secures the cable jacket using compression fittings, clamps, or adhesive systems. It distributes any external mechanical forces (tension, bending, vibration) across the cable structure rather than allowing them to concentrate at the fragile solder joints or crimp connections inside the connector. The backshell portion provides environmental sealing and electromagnetic shielding in many applications. By absorbing and spreading stress, it prevents damage to the electrical contacts and maintains consistent performance.
Common Materials
Aluminum alloy, Stainless steel, Thermoplastic
Technical Parameters
ParameterTypical rangeNotes & selection driver
Cable Diameter Range4–14 mmMust match cable jacket OD for proper grip
Thread SizeM12–M40 mmStandard metric thread for cable glandsDIN EN 60423
Operating Temperature-40–105 °CContinuous operation range
IP RatingIP54–IP68Higher IP for harsh environmentsIEC 60529
Pull-Out Force100–500 NResistance to axial pull
Bending Radius5–20 mmMinimum static bend radius
MaterialPA66, Ni-plated brass, SS304Flame retardant gradeUL 94 V-0
Weight10–80 gDepends on size and material

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Clamping Mechanism
    Secures the cable jacket through compression to prevent pull-out
    Material: Stainless steel
  • Backshell Body Part
    Provides structural housing and environmental protection
    Material: Aluminum alloy
  • Sealing Gasket Part
    Creates environmental seal between backshell and connector
    Material: Silicone rubber
  • Grounding Lug Part
    Provides electrical grounding connection for shielding
    Material: Brass

Application & selection

Application Fit & Sizing Matrix

Operational Limits
pressure: Not applicable (mechanical component, not pressure-rated)
other spec: Cable diameter range: 3mm to 25mm, Vibration resistance: Up to 10g RMS, IP rating: IP67/IP68 (environmental sealing)
temperature: -55°C to +125°C (operational range, typical for industrial-grade polymers)
Media Compatibility
✓ Industrial control cables (PVC/jacketed) ✓ Aviation/military connectors (MIL-DTL-38999 series) ✓ Marine/offshore electrical systems (saltwater environment)
Unsuitable: High-temperature (>150°C) or corrosive chemical immersion environments
Sizing Data Required
  • Cable outer diameter (OD) including jacket
  • Connector shell size/thread specification
  • Required bend radius protection (minimum radius)

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Cable Pull-Out
Cause: Inadequate clamping force or improper installation allowing cable movement under vibration/tension
Connector Pin Damage
Cause: Excessive bending stress at cable entry point due to lack of proper strain relief, leading to internal wire breakage
Maintenance Indicators
  • Visible cable movement or rotation at backshell interface
  • Audible clicking/creaking from connector during equipment operation or movement
Engineering Tips
  • Use torque-controlled installation tools to ensure proper clamping force without over-tightening
  • Implement regular inspection protocols for cable bend radius compliance and backshell alignment

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
IEC 60529 Degrees of Protection Provided by Enclosures (IP Code) MIL-DTL-38999 Series I Connectors, Electrical, Circular, Miniature, High Density, Quick Disconnect, Environmental Resistant, Removable Crimp and Hermetic Solder Contacts

Quoted from the published standard.

Manufacturing Precision
  • Thread Engagement: +/-0.1mm
  • Cable Clamp Bore Diameter: +/-0.05mm
Quality Inspection
  • Pull Test (Cable Retention Force)
  • Salt Spray Test (Corrosion Resistance per ASTM B117)
Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
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Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
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Manufacturers of Strain Relief/Backshell

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Frequently Asked Questions

What is the primary function of a strain relief/backshell?

It secures the cable at the connector rear and prevents mechanical stress from being transmitted to the electrical contacts, ensuring reliable connections.

What materials are commonly used?

Aluminum alloy, stainless steel, and thermoplastic are typical materials, each offering different properties in strength, weight, and corrosion resistance.

How do I select the right strain relief/backshell?

Consider cable diameter, thread size, operating temperature, IP rating, pull-out force, bending radius, and material compatibility. Verify these parameters with the manufacturer for your specific application.

What standards apply to these components?

Thread sizes may follow DIN EN 60423, IP ratings per IEC 60529, and flame retardancy per UL 94 V-0. Always confirm compliance with the supplier.

Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Related equipment

Applied To / Applications

This component is essential for the following industrial systems and equipment:

ATE Connector
View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 12 October 2026

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