Secure your trailer with confidence. The “UCS-77S-2516” is PACLOCK’s high-security solution for standard 2-5/16” trailer couplers – engineered from top-grade materials for strength, simplicity, and all-weather reliability. PACLOCK’s patent-pending two-piece design integrates the lock body directly into the protective shroud, eliminating the need for a separate puck. That means faster installs, fewer parts to manage, and less frustration – especially in harsh conditions like rain, mud, or snow. At the heart of the lock is PACLOCK’s patented 304-grade stainless steel cone puck – a customer favorite for its superior corrosion resistance and toughness. Unlike the 303 or 302 grades used by competitors, 304 resists PACLOCK High-Security Trailer Coupler Lock, 2-5/16in., Stainless Steel Cone Puck, Model# UCS-77S-2516

Northern Tool Item# 6988304

Item Weight: 12.0000 lb(s) Manufacturer: MPN: Warranty: . Product Summary:

Secure your trailer with confidence. The “UCS-77S-2516” is PACLOCK’s high-security solution for standard 2-5/16” trailer couplers – engineered from top-grade materials for strength, simplicity, and all-weather reliability. PACLOCK’s patent-pending two-piece design integrates the lock body directly into the protective shroud, eliminating the need for a separate puck. That means faster installs, fewer parts to manage, and less frustration – especially in harsh conditions like rain, mud, or snow. At the heart of the lock is PACLOCK’s patented 304-grade stainless steel cone puck – a customer favorite for its superior corrosion resistance and toughness. Unlike the 303 or 302 grades used by competitors, 304 resists cracking and deformation under hammering and prying. It can also work-harden during poorly executed drilling attempts, making frontal attacks even harder to pull off. The cone shape deflects drill bits before they can grab – a key defense feature. The shrouded 1/4in. steel housing provides added protection from cutting and blunt force attacks. A zinc-plated base layer beneath the powder coating keeps rust at bay – even if the outer finish is damaged. With PACLOCK’s Universal Cylinder System™ (UCS™) and Every Lock, One Key™ (ELOK™) capability, you can key all your PACLOCKs alike – from your coupler to trailer doors, hitch receivers, latch pins, YETI® coolers, toolboxes, and more. Innovation That Secures What Matters. PACLOCK builds locks that perform when it counts – smart designs, serious materials, and unmatched versatility for people who take security seriously.

Payment Instructions

• You can pay us securely through .
• All orders will contain an invoice/receipt. IMPORTANT: We will not honor requests to remove invoices or receipts from packages. No exceptions
• ON U.S. PURCHASES, Northern currently collects sales tax on purchases shipped to all states except: Alaska, Delaware, Montana, New Hampshire, Oregon

Shipping Information

• This product will be shipped by Parcel.
• Parcel Shipping: Ground shipped items must be sent to a physical address and cannot be sent to a PO box. If a PO box address is submitted without a physical address, it may delay your order.
• We cannot ship to APO/FPO boxes.
• Please note that we do not ship items on weekends or holidays. More information on shipping and handling times can be found on our Store Policies Page.

Customer Care

• We want you to be satisfied with your purchase; please notify us by email if you have any concerns.
• Before you send an email message, please check our Help Section. We may already have an answer to your question!
• We are available to answer your email questions Monday through Friday from 8am - 3pm CST, excluding holidays. If your email is sent on a weekend, holiday or after business hours, we will respond to you on the following business day.
• Returns may be accepted on most items within 30 days of receipt of the item. All returns require authorization from us. Some returns are charged a 15% restocking fee. Please click the Shipping and Payments tab on this item for specific return information and full details.

About Our Products

• Product Warranty:
• Warranty information and contact details can be found on our Store Policies Page.
• We are working hard to ensure that the information provided on the product advertisements is accurate and up-to-date. We reserve the right to correct ad errors and/or omissions. Pricing and availability is subject to change without notice.

WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov

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PACLOCK High-Security Trailer Coupler Lock, 2-5/16in., Stainless Steel Cone Puck, Model# UCS-77S-2516

Northern Tool Item# 6988304

Item Weight: 12.0000 lb(s) Manufacturer: MPN: Warranty: . Product Summary:

Secure your trailer with confidence. The “UCS-77S-2516” is PACLOCK’s high-security solution for standard 2-5/16” trailer couplers – engineered from top-grade materials for strength, simplicity, and all-weather reliability. PACLOCK’s patent-pending two-piece design integrates the lock body directly into the protective shroud, eliminating the need for a separate puck. That means faster installs, fewer parts to manage, and less frustration – especially in harsh conditions like rain, mud, or snow. At the heart of the lock is PACLOCK’s patented 304-grade stainless steel cone puck – a customer favorite for its superior corrosion resistance and toughness. Unlike the 303 or 302 grades used by competitors, 304 resists cracking and deformation under hammering and prying. It can also work-harden during poorly executed drilling attempts, making frontal attacks even harder to pull off. The cone shape deflects drill bits before they can grab – a key defense feature. The shrouded 1/4in. steel housing provides added protection from cutting and blunt force attacks. A zinc-plated base layer beneath the powder coating keeps rust at bay – even if the outer finish is damaged. With PACLOCK’s Universal Cylinder System™ (UCS™) and Every Lock, One Key™ (ELOK™) capability, you can key all your PACLOCKs alike – from your coupler to trailer doors, hitch receivers, latch pins, YETI® coolers, toolboxes, and more. Innovation That Secures What Matters. PACLOCK builds locks that perform when it counts – smart designs, serious materials, and unmatched versatility for people who take security seriously.

Payment Instructions

• You can pay us securely through .
• All orders will contain an invoice/receipt. IMPORTANT: We will not honor requests to remove invoices or receipts from packages. No exceptions
• ON U.S. PURCHASES, Northern currently collects sales tax on purchases shipped to all states except: Alaska, Delaware, Montana, New Hampshire, Oregon

Shipping Information

• This product will be shipped by Parcel.
• Parcel Shipping: Ground shipped items must be sent to a physical address and cannot be sent to a PO box. If a PO box address is submitted without a physical address, it may delay your order.
• We cannot ship to APO/FPO boxes.
• Please note that we do not ship items on weekends or holidays. More information on shipping and handling times can be found on our Store Policies Page.

Customer Care

• We want you to be satisfied with your purchase; please notify us by email if you have any concerns.
• Before you send an email message, please check our Help Section. We may already have an answer to your question!
• We are available to answer your email questions Monday through Friday from 8 - 3 CST, excluding holidays. If your email is sent on a weekend, holiday or after business hours, we will respond to you on the following business day.
• Returns may be accepted on most items within 30 days of receipt of the item. All returns require authorization from us. Some returns are charged a 15% restocking fee. Please click the Shipping and Payments tab on this item for specific return information and full details.

About Our Products

• Product Warranty:
• Warranty information and contact details can be found on our Store Policies Page.
• We are working hard to ensure that the information provided on the product advertisements is accurate and up-to-date. We reserve the right to correct ad errors and/or omissions. Pricing and availability is subject to change without notice.

WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov