SECO-LARM SM-4104-TQ/W 3/4″ Steel-Door Quick-Connect Terminals Recessed-Mount Magnetic Contact – White, 1″ (25mm) Gap, Closed loop, UL Listed
Review: 5 - "A masterpiece of literature" by , written on May 4, 2006
I really enjoyed this book. It captures the essential challenge people face as they try make sense of their lives and grow to adulthood.

SECO-LARM SM-4104-TQ/W 3/4″ Steel-Door Quick-Connect Terminals Recessed-Mount Magnetic Contact – White, 1″ (25mm) Gap, Closed loop, UL Listed

  • Product SKU: SECO-SM-4104-TQ-W
Save $4.20 Was $7.70
  • Order within

    and choose FedEx 2Day® Shipping

SECO-LARM SM-4104-TQ/W 3/4″ Steel-Door Quick-Connect Terminals Recessed-Mount Magnetic Contact – White, 1″ (25mm) Gap, Closed loop, UL Listed

The SM-4104-TQ/W is a 3/4″ Steel-Door Quick-Connect Terminals Recessed-Mount Magnetic Contact designed to provide robust security solutions for doors and windows in various settings. Its white color complements most light-colored surfaces, making it visually unobtrusive when installed. Featuring a 1″ (25mm) gap, it ensures efficient detection of any door or window movement. The quick-connect terminals simplify the installation process, saving time and effort for both professional installers and DIY enthusiasts. With a closed loop configuration, the contact remains engaged even when the door or window is closed, maintaining a high level of security. Furthermore, the SM-4104-TQ/W is UL Listed, confirming its compliance with safety and performance standards, making it a reliable choice for reinforcing access points and safeguarding premises.

  • Used for steel framed doors and windows where space is limited or to avoid unsightly installations
  • Strong one-piece construction
  • Gold-plated terminals for longer life and reliability
  • Screw terminals
  • Switch and magnet have ribs for securing in holes
  • Contact reed switch is SPST, iridium-plated to have a high melting point and Vickers hardness, for higher handling power and a long life
  • 1″ (25mm) Gap
  • High-impact white ABS plastic
  • Lifetime limited warranty
Loop Type Closed loop
Electrical Configuration N/O
Operation Gap 1″ (25mm)
Color White
Material – Case High-impact ABS plastic
Material – Terminals Gold-plated
Contacts Iridium-plated
Contact Rating 1.0A@10VDC(max), 10W (max)
Operating Temperature -15°~160°F (-25°~70°C)
Switch Cycles 50 Million (0.1mA@5VDC)
Switch Dimensions 1-3/16″ x 15/16″ x 3/8″ (30 x 24 x 9 mm)
Magnet Dimensions 1-3/16″ x 15/16″ x 1/2″ (30 x 24 x 13 mm)
Magnet Type Rare-earth Neodymium alloy

Shipping Policy

All orders are shipped between 24 hours or less Monday through Friday from 9:00 am to 6:00pm. Orders placed after 4 p.m. EST will be shipped next business day. 

We may use the following carriers; FedEx, USPS and UPS. Our orders ship via FedEx within 48 continental U.S. states, Canada , Alaska, Hawaii and Puerto Rico. FedEx does not service P.O. Box or APO/FPO addresses .

We start processing the shipment of orders after we processed the payment.

We retain the right to temporarily suspend the shipping of any orders suspected of fraudulent activity until the verification process has been successfully completed.

We are not responsible for lost or stolen items delivered in accordance with our shipping and delivery practices listed above. We are willing to work with a carrier to resolve any issues regarding your delivery.

Once a package has been shipped out per your order specifications, it is literally out of our hands and becomes the responsibility of the shipping carrier selected. We can't stop, delay or expedite any shipments once they have been shipped.

Only shipping services which have the transit time in the title (Next Day, Overnight, 2-Day, etc.) are guaranteed transit times. All other transit times (Ground, Priority, etc.) are estimates and are not guaranteed by the carrier or by LOCKSMITH KEYLESS. Shipping delays due to weather are not refundable as per the shipping carriers. Saturday delivery is not a guaranteed service. If Saturday delivery is selected and the shipment does not arrive on Saturday no shipping charges can be refunded.

Puerto Rico, Alaska & Hawaii

Orders to Puerto Rico, Alaska & Hawaii will not qualify for free shipping if they have ANY Hardware products on them and/or Key Machines. Only Automotive products are eligible for Free Shipping.

Order Verification

In the event that your order is flagged by our system for any reason, we will promptly notify you via email to initiate additional verification steps. These steps may include:

  • Providing a selfie-formatted picture of your ID
  • Providing evidence of your address
  • Verifying credit card ownership
  • Submitting a screenshot of the relevant bank transaction
  • Verification of business/ownership

Please note that the proof of address can be any mail item that displays both your name and the shipping address.

Your cooperation in this matter is greatly appreciated.

Weekend Orders

All orders placed after hours Friday, Saturday and Sunday will be shipped on Monday or the next business day in case of a holiday.

Friday - Overnight orders placed on Friday must be done before 2PM Eastern. Friday Overnight deliveries will arrive Monday unless a special Saturday delivery Overnight option is checked. 

Saturday and Sunday - Orders will be shipped on Monday or the next business day in case of a holiday.

International Shipping

For international shipping, please note that you may be responsible for paying any possible customs and import duties at the time of delivery, however you should only worry about those fees if you order several hundred dollars worth of goods shipped outside the US. We are unable to determine these fees during the checkout process. You can contact your local Customs office for details.

Signature Requirement

Signature required may be requested on the shopping card. It is optional.

Missing Items / Discrepancies

Any wrong item or missing item(s) must be reported to us within 48 hours from delivery. We cannot replace or compensate for missing items after the 48 hour period.


Cancelled orders may be credited as a store credit or refunded with a 3% to 10% credit card fee.

No-Hassle Returns

If you a Locksmith & are not satisfied for any reason, products may be returned within 30 days of purchase for a store credit or exchange. Certain restrictions apply.

See Returns Policy