LCN 4642-3971 4640 Series Door...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$2,746.00
$1,758.90
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
$1,758.90
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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) What is the LCN 4642/3971/4640 series cylinder closer designed for?
This cylinder closer is designed for heavy-duty commercial door applications. It provides controlled closing force for doors up to specific weight limits. The closer only unit requires separate arm and bracket components for complete installation.
2) What door weights and widths are compatible with this closer?
Verify door specifications against manufacturer requirements. Most LCN closers in this series handle doors up to 150-200 pounds. Door width capacity varies by model. Check the manufacturer template for exact compatibility with your door dimensions.
3) Does this closer work for both right and left hand doors?
Most LCN cylinder closers are universal for handing when properly configured with arms. The closer body typically mounts the same way. The arm selection and mounting determines final hand compatibility. Verify handing requirements during installation planning.
4) What finish options are available for this closer series?
LCN typically offers standard finishes like aluminum, bronze, and painted options. Specific finish availability varies by model number. Check product specifications for exact finish codes. Match closer finish to other door hardware for consistent appearance.
5) What closing force and speed adjustments does this closer provide?
The closer includes adjustable closing speed and latching speed controls. Most models provide separate adjustment valves for sweep speed and latch speed. Some include backcheck adjustment. Use manufacturer recommended settings as starting point for field adjustments.
6) Does this closer meet ADA and building code requirements?
LCN closers typically meet ADA requirements when properly adjusted. Opening force should not exceed 5 pounds. Closing time must allow adequate passage time. Verify local building code requirements and adjust closer accordingly during installation.
7) What additional components are needed with this closer only unit?
You need compatible arms and brackets for complete installation. Arm selection depends on door type and mounting requirements. Standard, hold-open, and parallel arms are common options. Check LCN arm compatibility charts for proper component selection.
8) How is this closer typically mounted on the door frame?
The closer mounts to the door frame header using the manufacturer template. Standard top jamb mounting is most common. Ensure adequate clearance above door for closer body and arm operation. Use proper fasteners for frame material and load requirements.
9) How do you maintain and service this door closer?
Regular maintenance includes checking adjustment settings and inspecting for fluid leaks. Clean closer body and arm connections periodically. Adjustment valves may need seasonal tuning for temperature changes. Replace worn arms or seals when performance degrades.
10) What other LCN closer models are similar to this series?
Related LCN models include other 4000 series closers with similar capacity ratings. The specific model differences typically involve mounting options or adjustment features. Consult LCN product guides to identify suitable substitutes or upgrades for your application.
11) Can this closer handle exterior door applications?
Many LCN closers handle exterior applications when properly specified. Consider temperature range, weather exposure, and finish durability. Exterior installations may require different adjustment settings for seasonal temperature variations. Verify environmental ratings for your climate conditions.
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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