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

Parameter	Typical range	Notes & selection driver
Cable Diameter Range	4–14 mm	Must match cable jacket OD for proper grip
Thread Size	M12–M40 mm	Standard metric thread for cable glandsDIN EN 60423
Operating Temperature	-40–105 °C	Continuous operation range
IP Rating	IP54–IP68	Higher IP for harsh environmentsIEC 60529
Pull-Out Force	100–500 N	Resistance to axial pull
Bending Radius	5–20 mm	Minimum static bend radius
Material	PA66, Ni-plated brass, SS304	Flame retardant gradeUL 94 V-0
Weight	10–80 g	Depends 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

Applied To / Applications

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

ATE Connector

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Manufacturers of Strain Relief/Backshell

Manufacturer profiles associated with 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.

Preliminary Technical Classification

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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)

Strain Relief/Backshell

Product Specifications

Applied To / Applications

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