LCN 4642-3971 4640 Series Door...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$2,746.00
$1,755.59
LCN 4642-3971 Heavy-Duty Commercial Door Closer Cylinder Body in 689 Aluminum finish, 3/4 view showing full cylinder body, mounting bracket, and spindle

LCN 4642-3971 4640 Series Door Closer Cylinder Body

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Model: 4642-3971-AL
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$2,746.00
$1,755.59
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LCN 4642-3971 — 4640 Series Door Closer Cylinder Body

The LCN 4642-3971 is the cylinder body for the LCN 4640 Series heavy-duty door closer — a genuine OEM replacement component for commercial and institutional openings. This is the cylinder only; it does not include the arm or track. Designed for retrofit and maintenance applications where the existing arm and hardware are serviceable but the cylinder body requires replacement.

Compatible Applications

  • Direct replacement for LCN 4640 Series door closer cylinder bodies
  • High-traffic commercial openings: schools, hospitals, office buildings, government facilities
  • Institutional and multi-family residential common-area doors
  • Maintenance and MRO replacement programs requiring genuine LCN parts

Key Features

  • Genuine LCN OEM component — ensures proper fit and function within the 4640 Series system
  • Heavy-duty commercial construction — built for high-cycle, high-traffic door openings
  • Cylinder-only design — pairs with existing 4640 Series arms and tracks; no arm included
  • Finish: 689 Aluminum
  • Warranty: 2-year manufacturer warranty

Specifications

  • Part Number: 4642-3971
  • Series: LCN 4640 Series
  • Component Type: Cylinder Body Only (arm not included)
  • Application: Commercial
  • Finish: 689 – Aluminum
  • Warranty: 2 Year

For installation guidance, refer to the LCN 4640 Series installation instructions and templates index linked in the product documents below.

Product Specs

Series:
4640 Series
Warranty:
2 Year
Subcategory:
Parts and Accessories
Product Group:
Door Controls
Product Subgroup:
Parts and Accessories
Product Type:
Door Closer Parts and Accessories
Commercial/Residential:
Commercial
Product Category:
Door Controls
Department:
Door Hardware

LCN 4642-3971-AL – Frequently Asked Questions

1) Does the LCN 4642-3971 cylinder body come with the arm and track, or do I need to order those separately?
Cylinder body only. The 4642-3971 ships as the closer body with no arm and no track, so it reuses the 4640 Series arm and track already on the door. That is the point of the part: when the arm and mounting hardware are still serviceable and only the cylinder has failed, you replace the body and leave the rest of the installation alone. If your arm is bent, worn at the pivot, or missing, you need to source that separately, because nothing in this box will replace it.
2) Will the 4642-3971 fit an LCN 4640 Series closer already installed on the door?
Yes, it is the direct replacement cylinder body for LCN 4640 Series door closers. It is a genuine LCN OEM component built to fit and function within that series, so it lands on the existing 4640 mounting and works with the arm and track already in place. It is not a substitution part for other LCN families; if the closer on the door is a different series, this body is the wrong item.
3) Is the LCN 4640 Series cylinder body suitable for a high traffic school or hospital door?
That is what it is built for. The 4642-3971 is a heavy duty commercial cylinder body intended for high cycle openings, and LCN lists schools, hospitals, office buildings, and government facilities among its applications, along with institutional and multi-family common area doors. It is a commercial part, not a residential one, so a facility standardizing its closer parts across a building can stock it as the 4640 Series service item.
4) Do I need to re-template the door to install a 4640 Series replacement cylinder body?
No new prep is needed on a like-for-like 4640 swap, because the replacement body mounts to the existing 4640 Series installation and reuses the arm and track. For the mounting details and hole patterns on your specific application, LCN publishes the 4640 Series installation instructions and template index, which is the document to work from if the original closer is coming off a door whose prep you cannot verify.
5) What finish does the LCN 4642-3971 door closer body come in?
689 aluminum, and that is the only finish it is offered in. On a maintenance swap that usually matches, since 689 is the standard sprayed aluminum finish most commercial closers go out in. If the rest of your closer hardware on that opening is a painted or plated finish and appearance matters, the body will read as aluminum against it.
How fast can I get the LCN 4642-3971-AL 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 LCN 4642-3971-AL come with a warranty?
Absolutely. The LCN 4642-3971-AL 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 LCN 4642-3971-AL?
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 LCN 4642-3971-AL from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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