Product Description
3/4" Timber Bolts by OZCO OWT — Self-Adjusting, Black Powder-Coated, Professional Grade
- Self-Adjusting Take-Up — Inside-out design provides up to 2" of adjustment for a perfect fit without trimming threads
- Clean, Finished Look — Smooth hex-cap ends with no exposed cut-offs or sharp edges
- Outdoor-Ready — Strong hot-dip galvanized steel with an exterior-grade black powder coat
- Professional Grade Connection — Reliable through-bolt strength for pergolas, decks, arbors, and pavilions
- Multiple Length Ranges & Pack Sizes — Cover material stacks from 1-1/2" up to 12"; available in 2-packs and contractor packs
OZCO Ornamental Wood Ties (OWT) 3/4" Timber Bolts deliver the strength of a true through-bolt with a refined, finished appearance. The self-adjusting mechanism provides up to 2" of built-in take-up, eliminating on-site trimming and leaving no exposed threads. A hot-dip galvanized core and durable black powder coat stand up to weather, making these fasteners a reliable, professional grade choice for outdoor wood structures.
Why Choose This
- Professional grade fastener engineered for heavy wood-to-wood joints
- Faster installs — 2" take-up removes the need to cut bolt ends
- Cleaner aesthetics — finished hex-cap look complements visible structures
- OWT system friendly — coordinates with OWT connectors and decorative hardware
- Low maintenance — galvanized steel + powder coat for year-round performance
Specifications
| Adjustable Bolt Length | 1-1/2"–4" | 4"–6" | 6"–8" | 8"–10" | 10"–12" |
| Diameter | 3/4" | 3/4" | 3/4" | 3/4" | 3/4" |
| Available Package Sizes | 2-Pack or 30-Pack | 2-Pack or 30-Pack | 2-Pack or 30-Pack | 2-Pack or 30-Pack | 2-Pack or 25-Pack |
| Drive Type | Hex drive | Hex drive | Hex drive | Hex drive | Hex drive |
| Material | Hot-dip galvanized steel | Hot-dip galvanized steel | Hot-dip galvanized steel | Hot-dip galvanized steel | Hot-dip galvanized steel |
| Finish | Black powder coat | Black powder coat | Black powder coat | Black powder coat | Black powder coat |
| Typical Usage | Small assemblies, mailboxes, signs | Arbors, pergolas, playgrounds | Deck framing & structures | Heavy deck/pavilion connections | Large, heavy-duty timber projects |
Installation
Pre-drill through members, insert the timber bolt, and tighten the hex-cap ends until the joint is fully compressed. The built-in 2" take-up removes slack without cutting bolt ends. Re-check tightness after initial wood movement.
Download the OZCO 3/4" Timber Bolt Installation Manual
Warranty
See the OZCO Building Products warranty here
Resources
- OZCO OWT Timber Bolt / Screw ASTM Certification
- OZCO-OWT 3/4" Timber Bolt Salt Spray Report
- OZCO Project #209 — 10x20 Pavilion (6x6 Posts)
- OZCO Project #216 — 12x20 Pavilion (6x6 Posts)
- OZCO Project #220 — Pavilion-Pergola Combo with Bar
- OZCO Project #576 — Firepit & Swing Seating
- OZCO Project #705 — 28x18x14 Deck
Buying Guide
- Choose the Length Range: Add up the total wood thickness (plus any plates/hardware) and select the adjustable range that covers that stack (1-1/2"–4", 4"–6", 6"–8", 8"–10", or 10"–12").
- Pick Your Pack: Order 2-packs for small jobs or contractor packs (30-pack; 25-pack for 10"–12") for larger builds.
- Match the Look: Pair with OWT decorative washers and connectors for a consistent, finished appearance.
- Environment: Powder-coated, hot-dip galvanized steel is suitable for exterior, pressure-treated lumber. For coastal sites, schedule routine rinse-downs and inspections.
- Tools: Use the correct hex driver and a drill/impact driver; pre-drilling is recommended for straight, clean through-holes.
Frequently Asked Questions
- How much adjustability do these bolts have?
- Each 3/4" OWT Timber Bolt provides up to 2" of take-up, so you can tighten joints without cutting off excess threads.
- Which length should I buy?
- Choose the adjustable range that covers your total material stack. For example, a 5-1/2" stack fits the 4"–6" range; a 9" stack fits the 8"–10" range.
- Do I need to cut the bolt after installation?
- No. The self-adjusting design eliminates trimming—tighten until the joint is fully compressed.
- Are washers or decorative caps included?
- No. The bolts feature integrated hex-cap ends. OWT washers and accent hardware are available separately if you want a larger bearing surface or specific look.
- Are these suitable for outdoor, pressure-treated lumber?
- Yes. The hot-dip galvanized steel with exterior-grade powder coat is designed for outdoor use with treated lumber. Inspect hardware periodically, especially in coastal environments.
- Do these work with OWT connectors and post bases?
- Yes. Timber Bolts are designed to coordinate with the OWT family of connectors and hardware.
