3M Scotchlok Insulation Displa...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$88.57
3M Scotchlok Insulation Displacement Connector 22-16 AWG Pigtail Self-Stripping Moisture Resistant, 100 Pack

3M Scotchlok Insulation Displacement Connector 22-16 AWG Pigtail Self-Stripping Moisture Resistant, 100 Pack

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Model: 557-BOX
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3M Scotchlok Insulation Displacement Connector 22-16 AWG Pigtail Self-Stripping Moisture Resistant

Professional Insulation Displacement Connection Technology

The 3M Scotchlok Insulation Displacement Connector delivers reliable electrical connections for 22-16 AWG conductors with self-stripping pigtail design. This moisture resistant and flame retardant connector features dual element connection technology with maximum operating temperature of 221�F (105�C) and 600V voltage rating. The red connector accommodates maximum insulation O.D. diameter of 0.120 inches and provides UL and CSA approved performance for professional electrical applications.

Professional Features & Benefits

  • 22-16 AWG Conductor Range: Accommodates common wire gauges for versatile electrical connection applications with reliable contact performance.
  • Self-Stripping Pigtail Design: Eliminates manual wire stripping while providing secure insulation displacement connection for faster installation.
  • Moisture Resistant & Flame Retardant: Protects connections in challenging environments while meeting safety requirements for electrical installations.
  • 600V Maximum Voltage Rating: Supports high-voltage applications with reliable insulation and connection integrity for professional use.
  • 221�F (105�C) Operating Temperature: Maintains connection performance in elevated temperature conditions for demanding electrical environments.
  • UL and CSA Approvals: Meets recognized safety standards for electrical connectors ensuring code compliance and professional reliability.
  • Dual Element Connection: Provides enhanced contact reliability and connection security for critical electrical applications.

Technical Specifications

  • Agency Approvals: UL and CSA
  • Conductor Sizes: 22 - 16 AWG
  • Connection Type: Pigtail
  • Connector Style: Insulation Displacement
  • Family: IDC for Electrical Applications
  • Flame Retardant: Yes
  • Maximum Operating Temperature Celsius : 105 Degree Celsius
  • Maximum Operating Temperature Fahrenheit : 221 Degree Fahrenheit
  • Maximum Recommended Voltage Rating: 600 V
  • Maximum Wire Gauge: 16 AWG
  • Minimum Wire Gauge: 22 AWG
  • Packaging: Box
  • Product Color: Red
  • Product Family: IDC for Electrical Applications
  • Rohs 2011 65 Eu Compliant: Yes
  • Rohs Eu Comments: RoHS 2011/65/EU compliant without exemption
  • Trademark: Scotchlok

Professional Applications

  • Residential Electrical Installations
  • Commercial Building Wiring
  • Industrial Control Panels
  • Telecommunications Equipment
  • HVAC System Connections
  • Lighting Control Systems
  • Security System Wiring

Why Choose 3M Quality?

3M Scotchlok connectors deliver proven reliability with UL and CSA approvals, RoHS compliance, and flame retardant construction. The moisture resistant design and 600V voltage rating ensure long-term performance in professional electrical applications with the trusted quality of 3M engineering.

Manufacturer Resources

Product Specs

Agency Approvals:
UL and CSA
Conductor Sizes:
22 - 16 AWG
Connection Type:
Pigtail
Connector Style:
Insulation Displacement
Family:
IDC for Electrical Applications
Flame Retardant:
Yes
Maximum Operating Temperature Celsius:
105 Degree Celsius
Maximum Operating Temperature Fahrenheit:
221 Degree Fahrenheit
Maximum Recommended Voltage Rating:
600 V
Maximum Wire Gauge:
16 AWG
Minimum Wire Gauge:
22 AWG
Packaging:
Box
Product Color:
Red
Rohs 2011 65 Eu Compliant:
Yes
Rohs Eu Comments:
RoHS 2011/65/EU compliant without exemption
Trademark:
Scotchlok
Department:
Electrical
Product Type:
Connector
Product Group:
Wire Connectors & Terminals
Product Subgroup:
Wire Connectors

3M 557-BOX – Frequently Asked Questions

1) What wire sizes does the 3M Scotchlok 557 red connector take?
The 557 handles 22 through 16 AWG conductors. That covers thermostat wire, low-voltage control runs, alarm and security cable, and 16 AWG fixture leads. Anything heavier than 16 AWG will not seat correctly in the displacement element, and anything finer than 22 AWG may not make reliable contact. Red is 3M's color code for this gauge band, so you can identify it in a parts bin at a glance.
2) What is a pigtail IDC connector used for versus a run-through tap?
A pigtail connector terminates the end of a conductor and gives you a pre-stripped tail to land on a device, terminal, or another splice. It is an end-of-run termination, not a mid-run tap. If you need to branch off a conductor without cutting it, you want a run or tap style Scotchlok instead. The 557 is the pigtail version, so use it where the wire ends.
3) Do I have to strip the wire before using the Scotchlok 557?
No stripping needed. The 557 is self-stripping: the insulation displacement element cuts through the jacket as you crimp the connector closed with pliers, making metal-to-metal contact without you touching a stripper. That is the whole point of the design on repetitive low-voltage work, where stripping dozens of thermostat or alarm leads by hand is the slow part of the job.
4) Can I use these Scotchlok connectors on a 277V lighting circuit?
Yes. The 557 carries a 600V maximum recommended voltage rating, so 120V, 208V, 240V, and 277V branch circuits are all inside the rating, as are 480V control conductors. It is UL and CSA approved, which is what an inspector will look for on a commercial job.
5) Will these hold up inside a rooftop HVAC unit or a hot control panel?
The 557 is rated to a maximum operating temperature of 105 degrees Celsius (221 degrees Fahrenheit), and it is moisture resistant and flame retardant. That covers the ambient inside most packaged rooftop units, control cabinets, and ballast compartments. It is a resistant connector, not a submersible gel-filled one, so for direct burial or standing water use a filled connector instead.
6) Is there a limit on the insulation diameter of the wire I can put in a 557?
Yes, and it is the spec people miss. The 557 accepts a maximum insulation outside diameter of 0.120 inches. Gauge alone does not settle it: a 16 AWG conductor with heavy-wall or double-jacketed insulation can exceed 0.120 inches and will not close properly in the connector. Measure the jacket OD if you are working with anything other than standard thin-wall low-voltage cable.
7) How many 3M Scotchlok 557 connectors come in a box?
The 557-BOX is packaged 100 connectors per carton. For crews doing volume low-voltage terminations, the same part is cased 1000 per case. Ordering by the box keeps a truck stock of a single gauge band rather than a mixed assortment.
8) Are 3M Scotchlok 557 connectors RoHS compliant for a government or institutional spec?
Yes. The 557 is RoHS 2011/65/EU compliant without exemption, alongside UL and CSA agency approval. That combination is usually what a public-sector or healthcare procurement spec is asking for on an electrical connector submittal.
9) Can I splice two wires together with the 557, or does it only terminate one?
The 557 is a pigtail connector, so it terminates the conductor and presents a tail. It is not a butt splice and not a mid-run tap. If your job is joining two runs or tapping a live conductor without cutting it, the pigtail is the wrong style and you want a run or tap Scotchlok in the same 22-16 AWG range.
10) What kind of wiring do electricians actually use the red Scotchlok 557 on?
It shows up on thermostat and HVAC control leads, security and alarm system wiring, lighting control conductors, telecom terminations, and control panel wiring in commercial buildings. All of that sits in the 22-16 AWG band the 557 covers, and the self-stripping action is what makes it worth using where you have a lot of small conductors to land quickly.
How fast can I get the 3M 557-BOX delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the 3M 557-BOX come with a warranty?
Absolutely. The 3M 557-BOX is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the 3M 557-BOX?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the 3M 557-BOX from ZenSupply?
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