About Crosby Sheaves

A sheave is a grooved wheel that runs on a bearing or bushing inside a block frame. The rope seats in the groove and the sheave rotates as the rope moves, reducing the friction that would exist if the rope ran over a fixed surface. The groove profile - radius, depth, and angle - is sized to the rope diameter. A sheave that's the wrong size for the rope either constricts the rope (groove too small) or allows the rope to shift and jump the groove (groove too large).

Crosby sheaves are produced in alloy steel for wire rope crane and block applications. The groove geometry is matched to specific wire rope diameters, and the bearing or bushing design provides the rotational interface between the sheave wheel and the block pin.

Sheaves in crane block assemblies fall under ASME B30.26-2015 (Rigging Hardware) as part of the block system.

Holloway Houston stocks Crosby sheaves in Houston for replacement and repair applications on Crosby block systems.

Types of Crosby Sheaves

Wire Rope Sheaves

Wire rope sheaves have grooves profiled to specific wire rope diameters. The groove radius is slightly larger than the rope radius to allow the rope to seat without binding, while the groove depth keeps the rope from jumping out of the groove under load. Crosby wire rope sheaves cover the diameter ranges used in their snatch block and rigging block lines.

Nylon Sheaves

Nylon sheaves are used in synthetic rope applications and in environments where metal-to-rope contact would be inappropriate - food processing, some marine applications, and situations where the sheave material needs to be non-sparking. Nylon sheaves have a lower load rating than alloy steel sheaves at the same diameter.

Crosby Sheave Sizes

Crosby sheaves are sized by wire rope diameter compatibility. Sheave diameter (tread diameter) and groove profile vary by the block system and rope size the sheave is designed for.

Rope Diameter Compatibility:

• Wire rope sheaves sized for standard wire rope diameters from 1/4" through 1-1/2" and above

Materials:

• Alloy steel (standard wire rope sheaves)
• Nylon (synthetic rope and special applications)

Marking:

• Rope diameter compatibility per Crosby catalog specifications
• ASME B30.26-2015 (Rigging Hardware) requirements apply to the block assembly

Why Crosby for Sheaves

Replacement sheaves in Crosby block systems are the direct application - when a sheave wears to the point that the groove profile no longer matches the rope, the sheave comes out and a matched replacement goes in. Using Crosby sheaves in Crosby blocks maintains the dimensional compatibility that the block design was built around.

Groove wear progresses from the bottom of the groove outward. A worn groove's shoulders begin to contact the rope before the groove bottom does, putting the rope in a condition where it's pinched rather than supported. That's when rope wear accelerates and the potential for the rope to jump the sheave increases.

Holloway Houston also offers rigging inspection services. Our qualified inspectors examine block assemblies and sheaves per ASME B30.26-2015 (Rigging Hardware) and OSHA standards.

Shop Crosby Sheaves by Type

• Crosby Alloy Steel Wire Rope Sheaves
• Crosby Nylon Sheaves

Crosby Sheave Applications

• Rigging Block Replacement - Replacing worn sheaves in Crosby snatch blocks and rigging blocks to restore full groove-to-rope geometry.
• Crane Block Maintenance - Sheave replacement in overhead crane and hoist block assemblies where sheave wear is a scheduled maintenance item.
• Offshore and Marine Crane Systems - Sheave maintenance on pedestal crane blocks and fall block assemblies.
• Mining and Industrial Hoist Systems - Sheave replacement in production and maintenance hoisting systems where block assemblies run continuous cycles.

Why Holloway Houston for Crosby Sheaves

Holloway Houston is an authorized Crosby distributor with over 65 years in rigging and lifting, operating from Houston, Texas. We stock Crosby sheaves alongside rigging blocks, snatch blocks, and wire rope hardware.

Our rigging specialists can help identify the correct sheave size for a specific Crosby block model. We also offer rigging inspection services.

Related Block and Sheave Hardware

• Crosby Blocks - Rigging blocks and snatch blocks for wire rope applications.
• Crosby Wire Rope Clips - G-413 clips for wire rope terminations paired with block assemblies.
• Crosby Shackles - Anchor shackles for connecting blocks to structural connection points.

Sheave Safety and Awareness

Sheaves in rigging block assemblies fall under ASME B30.26-2015 (Rigging Hardware) as part of the block system. OSHA 1926.251 references rigging hardware inspection in jobsite use.

Key awareness points for sheaves in service:

• Sheave groove wear is measured by groove depth and the fit between the groove profile and the rope cross-section. A sheave gauge matched to the rope diameter is the standard measurement tool for groove wear inspection.
• A sheave that shows gauge wear, flat spots, cracking, or bearing seizure warrants removal from service.
• Rope wear patterns at the sheave contact zone - crown breaks on the strands or flattening of the outer wires - indicate the rope is being pinched or abraded at the sheave, typically caused by sheave groove wear or rope-to-sheave size mismatch.

DISCLAIMER

Sheaves are load-bearing components of rigging block systems. Selection, installation, and inspection call for training consistent with ASME B30.26-2015 (Rigging Hardware) and manufacturer documentation. The information on this page is provided for general product awareness and does not replace qualified engineering judgment, manufacturer specifications, or site-specific maintenance procedures.