The Borka Tools 65 Inch-Lbs Single PTL Kit (PTL0065K1) is a mechanical torque-limiting hand tool kit engineered for firearm maintenance and optic installations. It delivers a factory-calibrated, fixed 65 in-lb torque limit to prevent over-tightening critical fasteners such as Picatinny rail crossbolts, chassis action screws, and barrel retention systems. Built to ISO-6789 calibration standards, the precision torque limiter (PTL) features an internal adjustment mechanism that regulates release in the clockwise tightening direction while providing mechanical protection in counter-clockwise rotation to prevent internal damage during fastener removal.

Key Features

• Factory-Calibrated Torque Release: Delivers a consistent 65 in-lb limit calibrated to ISO-6789 industrial standards.
• Dual-Direction Protection: Provides precise clockwise torque limiting and mechanical protection in counter-clockwise rotation.
• Independent Ratchet Driver: Includes a detachable 4.37-inch ratchet handle with a 3/8-inch square drive and 1/4-inch hex drive, capable of standalone operation up to 250 in-lbs.
• Drive Interfaces: The limiter uses a 3/8-inch square female input and a 1/4-inch hex female output compatible with standard 1/4-inch hex screwdriver bits.
• Protective Hard Case: Supplied in an impact-resistant hard case with custom-cut foam compartments containing spare slots for additional bits or limiters.

Specifications

• Preset Torque Limit: 65 in-lbs (fixed)
• Limiter Dimensions: 0.87 inches outer diameter × 3.0 inches length
• Limiter Weight: 3.5 ounces (~99 g)
• Ratchet Handle Length: 4.37 inches
• Ratchet Maximum Load Rating: 250 in-lbs
• Drive Compatibility: 3/8-inch square drive input, 1/4-inch hex output
• Power Type: 100% manual mechanical operation

Who is the Borka Tools 65 Inch-Lbs Single Ptl Kit for?

• Precision rifle shooters — securing heavy-duty scope mount crossbolts and Picatinny rails with a dedicated preset torque limiter that ensures consistent 65 in-lb clamp force for repeatable zero retention.
• Gunsmiths — torquing firearm action screws and barrel retention assemblies requiring an exact 65 in-lb specification using a compact 3.5-ounce tool that eliminates the risk of thread stripping.

Less suitable for: Fasteners requiring lower torque values between 4 and 25 in-lbs (such as scope ring caps and turret caps), where a lower-torque preset limiter (15–25 in-lbs) or an adjustable 10–70 in-lb driver is required to prevent optic tube damage; and never suitable for use with motorized drills or power drivers.