TRP 9/16" × 3-1/2" Greaseable Wet Shackle Bolt (SHB-91635-LUBE)
TRP SHB-91635-LUBE Greaseable Wet Shackle BoltThe TRP SHB-91635-LUBE is a 9/16"-18 UNF × 3-1/2" trailer leaf-spring shackle bolt with an internal grease passage and an installed Zerk
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TRP SHB-91635-LUBE Greaseable Wet Shackle Bolt
The TRP SHB-91635-LUBE is a 9/16"-18 UNF × 3-1/2" trailer leaf-spring shackle bolt with an internal grease passage and an installed Zerk fitting (“wet” or greaseable design). Direct replacement for worn or damaged shackle hardware on utility, cargo, boat, dump, and equipment trailers. Zerk fitting allows the bushing to be lubricated under load without disassembling the shackle, extending bushing life and reducing wear. Replace shackle bolts in pairs to maintain even suspension geometry.
⚙️ Specifications
| Brand | TRP |
| Manufacturer Part # | SHB-91635-LUBE |
| Thread | 9/16"-18 UNF |
| Overall length | 3-1/2" |
| Thread length | 5/8" |
| Thread diameter | 0.5625" |
| Head style | Hex |
| Style | Greaseable (wet) — internal grease passage with installed Zerk fitting |
| Material | Steel, zinc plated |
| Approx. weight | ~0.25 lb each |
🔧 Fitment
Fits standard 9/16" trailer leaf-spring shackles requiring a 3-1/2" greaseable shoulder bolt. Common application on utility, cargo, boat, dump, and equipment trailers using slipper or double-eye leaf springs. Replaces dry (non-greaseable) shackle bolts of the same dimensions. Confirm bolt length and thread match your shackle bushings before ordering.
✔ Why a Wet (Greaseable) Bolt
- Internal grease passage feeds lubricant directly to the bushing surface
- Extends bushing service life vs. dry bolts — less squeal, less wear
- Allows scheduled lubrication without removing the shackle
- Standard upgrade over plain (dry) shackle hardware on trailers driven loaded
🔄 Cross-References
TRP SHB-91635-LUBE | SHB-91635 LUBE | SHB91635LUBE | Rockwell American 91635BZ | 14066 | 166079 | greaseable shackle bolt 9/16-18 x 3-1/2 wet | trailer leaf spring shackle hardware
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TRP 9/16" × 3-1/2" Greaseable Wet Shackle Bolt (SHB-91635-LUBE)
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TRP 9/16" × 3-1/2" Greaseable Wet Shackle Bolt (SHB-91635-LUBE)
$9.00
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