Crosby® McKissick® 404 Tailboard Blocks w/ Roller Bearings
The 404 Tailboard Block is a fixed-mount pulley that bolts directly into place rather than swinging on a hook or shackle end, making it built for permanent installation points on trucks, trailers, and rigging frames. This Crosby® McKissick® line runs on roller bearings instead of a bronze bushing, designed to hold up under heavy, repeated-use cycles - the kind of duty you see on wreckers, tow rigs, and stationary rigging setups where the block stays mounted and the wire rope does the moving. All four sizes are rated to a 16,000 lb working load limit and meet or exceed ASME B30.26 requirements.
Common Uses
- Wrecker and tow truck rigging with a permanent, bolted mounting point
- Fixed rigging frames and trailers needing a stationary wire rope redirection point
- Heavy-use-cycle applications where roller bearings outlast a bronze bushing
- Applications calling for a bolted connection instead of a hook or shackle
How to Choose the Right Tailboard Block
All four sizes share the same 16,000 lb working load limit, so sizing comes down to sheave diameter and available mounting space rather than load capacity. A larger sheave reduces wire rope bend and wear over repeated cycles, so size up when your mounting frame allows it. Confirm your wire rope diameter falls within the listed range for the size you choose - the 12" model is built specifically for 3/4" wire rope, while the 6", 8", and 10" models cover 5/8" to 3/4".
| Sheave Size |
Wire Rope Diameter |
Working Load Limit |
SKU |
| 6" |
5/8" - 3/4" |
16,000 lbs |
404T6RB-CR |
| 8" |
5/8" - 3/4" |
16,000 lbs |
404T8RB-CR |
| 10" |
5/8" - 3/4" |
16,000 lbs |
404T10RB-CR |
| 12" |
3/4" |
16,000 lbs |
404T122RB-CR |
Meeting ASME B30.26 covers the hardware's design and construction standard, not your specific installation. Confirm your mounting hardware, wire rope, and full rigging chain are matched to your lowest-rated component, and follow applicable OSHA rigging standards and your equipment documentation for installation and inspection requirements.
Complete the Job
Need a block that swings on a hook or shackle instead of bolting into a fixed position? Browse the 4180 Snatch Block w/ Hook, 4190 Snatch Block w/ Shackle, or 4040 Tailboard Block collections, or see the full line of Crosby® McKissick® Snatch Blocks for other bearing types and configurations.
Frequently Asked Questions
What's the difference between a tailboard block and a snatch block?
A tailboard block bolts into a fixed position and stays put - it doesn't swing on a hook or shackle. A snatch block hangs from a hook or shackle connection point and typically opens on one side to load wire rope. Choose a tailboard block when you need a permanent, stationary mounting point.
Why roller bearings instead of a bronze bushing?
Roller bearings are built to maintain consistent sheave rotation through heavy, repeated-use cycles, which suits applications like wrecker and tow rigging where the block sees frequent duty. A bronze bushing is a simpler, lighter-duty bearing surface suited to less intensive use.
Does a bigger sheave mean a higher working load limit?
Not in this line — all four sizes carry the same 16,000 lb WLL. The larger sheave sizes reduce wire rope bend and wear over time rather than adding load capacity, so choose based on your mounting space and duty cycle.
What does ASME B30.26 compliance mean?
ASME B30.26 sets design, construction, and marking requirements for rigging hardware like blocks and shackles. It confirms the hardware is built to that standard; it doesn't certify your specific installation or substitute for your own inspection and load calculations.
Is this a genuine Crosby® McKissick® product?
Yes, this collection carries the Crosby® McKissick® 404-type tailboard block configuration.
