Caldwell Model JP Vertical 90° Side Pull Locking Lifting Clamp

Vertical 90° Side Pull Locking Lifting Clamp — Plate Turning with Full Arc Side Load Capability

The Caldwell RENFROE Model JP is a locking-type vertical lifting clamp engineered to turn a single plate or structural member from horizontal to vertical and back through the same 90° arc. Designed for contractors and trades professionals who require reliable plate turning in heavy fabrication and steel erection environments, the Model JP handles up to 1 ton at the JP-01.00-A sub-model level. Its pivoting shackle design allows side loading of the lifting shackle across the full 90° range of motion, making it a versatile tool for complex lift paths and repositioning operations.

Where standard vertical lifting clamps restrict side loading entirely, the Model JP's pivoting shackle permits side loading at graded capacities through the full arc — giving riggers the flexibility to manage angular lifts without switching equipment. The integrated Lock Open / Lock Closed mechanism further distinguishes this model by allowing fast, secure attachment and removal from the plate without sacrificing clamping integrity during the lift.

Key Features & Benefits

90° Plate Turning Arc

The Model JP is specifically designed to turn a single plate or member from horizontal to vertical and back to horizontal through the same 90° arc. This bidirectional turning capability allows crews to reposition structural steel or plate stock on the same lift cycle, reducing the need for additional rigging setups and saving time on the job site.

Pivoting Shackle with Graded Side Load Capacity

The Model JP incorporates a pivoting shackle that permits side loading at 100% of rated capacity from vertical to 30°, 75% of rated capacity between 30° and 45°, and 50% of rated capacity between 45° and 90°. This graded side load capability allows riggers to work through angular lift paths that would be unsafe or impossible with a fixed-shackle vertical clamp, without being limited to vertical-only lifts.

Lock Open / Lock Closed Mechanism

The locking design features a dedicated lock assembly that secures the clamp in both the open and closed positions. The Lock Open position facilitates quick and easy attachment to and removal from the plate, while the Lock Closed position ensures the clamp stays fully engaged during the lift — a critical safety requirement when turning loaded members.

Optimized for High Cycle Count Operations

Caldwell recommends choosing the Model JP specifically for higher cycle counts and higher capacity lifts or pulls. In production environments where plates must be repeatedly turned and repositioned, the JP's construction is suited to withstand the demands of repetitive lifting operations without compromising performance or safety.

Common Applications

Structural Steel Plate Turning

The Model JP is purpose-built to rotate a single steel plate or structural member from a horizontal to a vertical orientation and back through the same 90° arc — a common requirement in steel fabrication shops and on erection sites.

Angular and Side Pull Lifting

The pivoting shackle allows the clamp to be used where the lift line is not directly vertical, accommodating side pull angles up to 90° from vertical with appropriate capacity derating as specified by the manufacturer.

High-Frequency Production Lifting

For operations that require repeated attachment, lifting, turning, and release cycles, the Model JP is the recommended choice within the J-Series line due to its design suitability for higher cycle counts.

Compatible Materials

• Single steel plates
• Structural steel members
• Flat plate stock requiring horizontal-to-vertical turning

Product Documents

• Download Catalog
• Download Operator's Manual
• Lifting Clamp Survey Report
• Lifting Tool Inventory and Maintenance Form
• Minimum Recommended Clamp Inspections
• Renfroe Repair Kits Catalog

Safety Data Summary

Safe Handling

• Read and understand the Operator's Manual before using the clamp.
• Do not lift over workers, safety areas, or personnel.
• Always lock the clamp closed before lifting; do not lift with the lock in the open position.
• Do not attach the clamp directly to the crane hook; use a flexible connection between the crane hook and the clamp shackle.
• Do not use a connection that may release the clamp.
• Use the correct clamp for the job; do not use large capacity clamps to lift light loads.
• Use clamps within their rated capacity; do not overload.
• Use enough clamps to balance the load; do not lift unbalanced loads.
• Inspect the clamp before each lift and follow all inspection and maintenance instructions.
• Do not side load with a straight shackle clamp — use the Model JP's pivoting shackle for side load applications.
• Do not lift more than one plate at a time with a vertical clamp.
• Do not lift plate horizontally with a vertical lift-only clamp.
• Do not alter, grind, weld, or modify the clamp in any manner.
• Secure the load before attaching the clamp.
• During turning operations, the edge of the plate opposite the clamped edge should always remain in contact with a supporting surface such as a floor, and the load on the clamp must not exceed one half of rated capacity during the turn.
• Use only RENFROE replacement parts to ensure proper operation.
• Consult the Operator's Manual or RENFROE when in doubt about any application or operation.

Frequently Asked Questions

Q: Can the Model JP be used to side load the lifting shackle, and if so, at what capacity?
A: Yes. The Model JP incorporates a pivoting shackle that permits side loading at 100% of rated capacity from vertical to 30°, 75% of rated capacity between 30° and 45°, and 50% of rated capacity between 45° and 90°.

Q: Can the Model JP turn a plate from horizontal to vertical and back to horizontal?
A: Yes. The Model JP is designed to turn a single plate or member from horizontal to vertical and back to horizontal through the same 90° arc.

Q: What does the Lock Open / Lock Closed feature do?
A: The Lock Open position facilitates easy attaching and removing of the clamp from the plate. The Lock Closed position secures the clamp during the lift to prevent accidental release.

Q: When should I choose the Model JP over other J-Series clamps?
A: The manufacturer recommends choosing the Model JP for higher cycle counts and higher capacity lifts or pulls compared to other models in the J-Series lineup.

Q: Is factory refurbishment and recertification available for the Model JP?
A: Yes. Caldwell/RENFROE offers factory refurbishment and recertification services. All clamps are proof tested and come with a certificate of proof test. Contact Caldwell at 800.628.4263 to begin the quote process.

Technical Specifications