About Crosby Thimbles

The Crosby G-403 rope thimble is a pressed or forged steel fitting shaped to sit inside a wire rope eye. The curved body of the thimble matches the bend radius of the rope at the eye, distributing the rope's bending load over a longer arc rather than over a sharp contact point. The outer groove of the thimble is where the shackle pin, hook, or other connection hardware bears, steel on steel rather than steel on rope strands. Thimbles don't carry a WLL themselves, they're a protective fitting for the rope eye, not a load-bearing component in the load path. The rope and termination method determine the eye assembly rating. Thimbles fall under ASME B30.26-2015 (Rigging Hardware) as part of the rigging hardware category. Holloway Houston stocks Crosby G-403 thimbles in Houston for standard wire rope diameters with same-day shipping.

Types of Crosby Thimbles

G-403 Standard Rope Thimbles

The Crosby G-403 is the standard pressed steel thimble for wire rope eyes. The groove profile is sized to the rope diameter, the rope sits in the groove and the thimble body holds the eye shape while taking bearing loads from the connection hardware. Available in rope diameters from 1/8" through 3" and above.

Heavy-Duty Thimbles

Heavy-duty thimbles are thicker-walled and better suited to applications where the connection hardware exerts significant contact pressure on the thimble outer surface, heavy crane rigging and offshore rigging where shackle pin pressures are high over extended service. Crosby heavy-duty thimbles are available for larger rope diameters.

Solid Thimbles

Solid thimbles (as opposed to open-profile thimbles) use a fully enclosed groove body. The closed groove prevents the rope from slipping out of the thimble during assembly and handling. Common in swaged eye assemblies where the thimble is captured inside the swage sleeve.

Crosby Thimble Sizes

Crosby G-403 thimbles are sized by wire rope diameter. Standard sizes cover 1/8" through 3" wire rope and above.

Size Range:

• G-403 Standard: 1/8" through 3" rope diameter.
• Heavy-duty: Available for larger rope diameters.

Materials:

• Standard: Pressed steel, self-colored or galvanized.
• Heavy-duty: Thicker-wall forged.

Marking:

• Rope diameter size per ASME B30.26-2015 (Rigging Hardware) requirements.

Why Crosby for Thimbles

The G-403's groove profile is sized to specific rope diameters, using a thimble that's too large for the rope allows the rope to shift inside the groove rather than seating against the thimble body, which defeats the purpose of the thimble as a bearing surface. Crosby's sizing system provides the right groove geometry for each standard rope diameter. For wire rope assemblies assembled with Crosby G-413 clips or Crosby swage sleeves, using Crosby G-403 thimbles keeps the assembly documentation within one manufacturer's catalog, which is simpler for equipment register entries and periodic inspection records. Holloway Houston also offers rigging inspection services. Our qualified inspectors examine wire rope assemblies and thimbles per ASME B30.26-2015 (Rigging Hardware) and OSHA standards.

Shop Crosby Thimbles by Type

• Crosby G-403 Standard Rope Thimbles.
• Crosby Heavy-Duty Thimbles.
• Crosby Solid Thimbles.

Crosby Thimble Applications

• Wire Rope Sling Eyes : Thimbles in the eyes of wire rope slings protect the rope at shackle connections and reduce eye wear in multi-use slings.
• Wire Rope Clip Terminations : G-403 thimbles used with G-413 wire rope clips form the standard field-assembled wire rope eye assembly.
• Swaged Eye Assemblies : Solid thimbles captured inside swage sleeve terminations for permanent rope eye assemblies.
• Crane Fall Line Terminations : Thimbles in wire rope dead-end eyes on crane back-stays, pendant lines, and fall line terminations.
• Marine Rigging : Thimbles in standing and running rigging eyes where the connection hardware bears on the thimble rather than the rope strands.

Why Holloway Houston for Crosby Thimbles

Holloway Houston is an authorized Crosby distributor with over 65 years in rigging and lifting, operating from Houston, Texas. We stock Crosby thimbles alongside wire rope clips, swage sleeves, and wire rope termination hardware. Our rigging specialists can match thimble size to your wire rope diameter. We also offer rigging inspection services.

Complete Your Wire Rope Eye Assembly

• Crosby Wire Rope Clips : G-413 forged clips paired with G-403 thimbles for field wire rope eye terminations.
• Crosby Wire Rope Sleeves : Swage sleeves for permanent wire rope eye terminations with captured thimbles.
• Crosby Shackles : Anchor shackles connecting wire rope eyes to rigging hardware.

Thimble Safety and Awareness

Rope thimbles are part of wire rope eye assemblies governed by ASME B30.26-2015 (Rigging Hardware). OSHA 1926.251 references wire rope rigging hardware in jobsite use.

Key awareness points:

• A thimble that has been spread open by overload or shifted out of position by repeated bearing loads no longer protects the rope eye and warrants replacement.
• Thimble groove size is matched to rope diameter. A thimble that's too small for the rope will distort the eye bend radius; one that's too large won't seat correctly against the rope and won't provide consistent bearing protection.
• Pre-use inspection of wire rope eyes with thimbles covers the thimble for deformation and correct seating, and the rope at the eye bend and inside the thimble groove for crown breaks and strand damage.