How to Choose a Heyco® Strain Relief - and Make the Right Choice

Part number and specification

To specify a Strain Relief and get the best fit, ask yourself the following 4 questions:

1. Is my wire or wire harness Round or Flat?
	Most Heyco Strain Relief tabular charts are segregated into "For Round Cables" and "For Flat Cables."
2. What is my wire or wire harness Diameter or Dimensions?
	Heyco Strain Relief charts are typically sequenced by Wire Size / Mounting Hole Size.
3. What is my panel Thickness?
	A. Lockit Strain Reliefs - Multiple Locking Step “Fingers” provide a Finished Fit across a wide spectrum of Panel Thicknesses
	B. Original Strain Reliefs - the Maximum Panel Thickness provides the best Finished Fit.
4. What Functionality and Assembly Method do I need?
	Heyco Strain Relief tabular charts are segregated by Functionality and ease of Assembly.
	For The Ultimate in Snap-in Strain Relief Protection:				Product
	A. Liquid Tight Strain Relief Bushings				View
	B. Snap-in Cordgrip Strain Reliefs – Straight-thru				View
		Snap-in Cordgrip Strain Reliefs – Pigtail			View
	C. Lockit™ Strain Reliefs - Snap-onto-cable "Pre-Assemble" by Hand Tool or Semi-Automatic Equipment For Faster Final Assembly - Semi-Automated Equipment Available				View
		1. ST Lockit Strain Reliefs - Straight-thru for Rectangular Mounting Holes			Round or Flat
		2. RDD Lockit Strain Reliefs - for "Double D" Mounting Holes
			a. 35lb. Pull Test	Straight-thru	RDD 101, RDD 201 - RDD 401, RDD 501 - RDD 601, UL Round Wire Chart, or Flat
			b. 35lb. Pull with Maximum Flex-protection	Pigtail	View
			c. 35lb. Pull with 90 degree exit from Panel	Right Angle	Round or Flat
		3. Specialty Strain Reliefs for Multiple Conductors, Split Panels			Multi-Lockit™, ST Lockit™, or Split Panel
		4. Universal and Romex® Strain Reliefs - widest range, snap into panel			Snap-In Universal or Snap-In Romex®
		5. Removable Snap-in Ratcheting Strain Reliefs - widest range, snap into panel			View
		6. Mounting Hole Plugs - Standardize Panel Design!			View
	D. Original Strain Reliefs - Assemble by Air Tool or Hand Pliers				Air Tool or Hand Pliers
		a. 35lb. Pull Test		Straight-thru	Flat: .375" (9,5 mm) to .500" (12,7 mm) Mounting Holes, Flat: .562" (14,3 mm) to .875" (22,2 mm) Mounting Holes, Round: .375" (9,5 mm) to .500" (12,7 mm) Mounting Holes, Round: .625" (15,9 mm) to .750" (19,0 mm) Mounting Holes, or Round: .875" (22,2 mm) to 1.187" (30,1 mm) Mounting Holes
		b. 35lb. Pull with minimum Flex-protection		Internal Radii	View
		c. 35lb. Pull with Flex-protection		Bell-Mouth	View
		d. 35lb. Pull with maximum Flex-protection		Pigtail	View
		e. 35lb. Pull with 90 degree exit from Panel		Right Angle	Round or Flat
		f. In-line Lampcord Strain Relief		Replaces "UL Knot"	View
		g. European Requirements		CEE	View
		h. Metal Strain Reliefs and Accessories			Knock-Out Adapters, Back-Up Washer, Bushings, or Attaching Pliers
		i. Romex® Nylon Snap-in Strain Relief Box Connectors		Clamping Connectors	View
		j. Brass Clamping Strain Relief Box Connectors		Clamping Connectors	View
		k. Zinc Die-Cast Box Connectors		Box Connectors	View

How to Choose a Heyco® Strain Relief – and Make the Right Choice

Part number and specification

To specify a Strain Relief and get the best fit, ask yourself the following 4 questions: