Product Description
Ironwood® Post Base Twin Rail Saddles by OZCO® OWT — Connect (2) 2×4 Rails to 4×4 or 6×6 Posts
- Two Rails, One Base — Integrated post base with twin 2×4 rail saddles for clean, symmetrical top-rail connections
- Inline or Corner — Mount rails straight through or at 90° to create in-line posts or true corners with the same hardware
- Field-Friendly Fastening — Hex Cap Nuts use a 3/8″ driver; rail screws use a T25 Torx bit for fast, consistent installs
- Outdoor-Ready — 3/16″ hot-dip galvanized steel with black exterior powder coat; approved for ACQ-treated lumber
- Matches Ironwood Style — Decorative hardware and geometry coordinate with the full Ironwood OWT line
Build stronger, better-looking wood rail sections with the Ironwood Post Base Twin Rail Saddle. Each assembly anchors your 4×4 or 6×6 post to the surface and captures two nominal 2×4 rails at the correct height, helping you meet common residential railing layouts. The twin-saddle design works for straight runs and 90° corners, while pre-engineered plates, included fasteners, and a single 3/8″ driver for caps/bolts streamline production on decks, porches, and decorative rail projects.
Why Choose This
- Speed + consistency — Pre-set geometry and included hardware minimize layout time and driver swaps
- Durability — Heavy-gauge steel, hot-dip galvanizing, and powder coat for long service life outdoors
- System look — Seamlessly pairs with Ironwood posts, beam hardware, and accents
Specifications
| Model / Item # | 4″×4″ — 51730 (4×4-TRS-IW) | 6″×6″ — 51772 (6×6-TRS-IW) |
| Typical Post Size | 4×4 wood post | 6×6 wood post |
| Rail Compatibility | Two nominal 2×4 rails (1-1/2″ × 3-1/2″) — inline or 90° corner | |
| Material / Finish | 3/16″ hot-dip galvanized steel with black powder coat; ACQ-approved | |
| Driver Sizes | 3/8″ hex (Hex Cap Nuts & OWT Timber Screws); T25 Torx (#12 rail screws) | |
| Included Hardware | (1) Base Plate; (2) Rail Saddle Plates; (2) Rail Saddles; (2) Standard Plates; (6) Hex Cap Nuts; (6) OWT Timber Screws 1-3/4″; (12) #12 × 1-1/4″ Torx HD (T25) | (1) Base Plate; (2) Rail Saddle Plates; (2) Rail Saddles; (2) Standard Plates; (8) Hex Cap Nuts; (8) OWT Timber Screws 2-3/4″; (12) #12 × 1-1/4″ Torx HD (T25) |
| Approx. Dimensions (packaged) | 8.38″ × 7.25″ × 4.63″ | 9.00″ × 8.25″ × 4.75″ |
| Approx. Weight | ~5.0 lb per kit | ~10.5 lb per kit |
| Typical Usage | Deck & porch guardrails, decorative rail sections, and similar wood-to-post connections | |
Installation
Set and plumb the post, then mount the Post Base to the surface per the project plan. Install the twin rail saddles (inline or corner), seat the 2×4 rails, and drive the included fasteners — 3/8″ hex driver for Hex Cap Nuts/Timber Screws and T25 for the #12 rail screws. Always fasten into sound lumber and follow local code for guard height, spacing, and loads.
Resources: Twin Rail Saddle — Installation Instructions (PDF) | Manufacturer’s Warranty
Buying Guide
- Choose your post size: Select 51730 for 4×4 posts or 51772 for 6×6 posts.
- Coordinate hardware: Keep extra OWT 1/4″ Timber Screws on hand for adjacent connections.
- Alternate look: Prefer the other OWT style? See Laredo Sunset Post Base Twin Rail Saddles for the same function with LS aesthetics.
Frequently Asked Questions
- Can this bracket form both straight runs and corners?
- Yes. The twin rail saddles support in-line rail connections or a 90° corner on the same post.
- What drivers do I need?
- A 3/8″ hex driver for Hex Cap Nuts and Timber Screws, and a T25 Torx bit for the #12 rail screws.
- Is it compatible with pressure-treated lumber?
- Yes. The hot-dip galvanized, powder-coated steel is approved for use with ACQ-treated materials.
- What rail size does it accept?
- Two nominal 2×4 rails (approx. 1-1/2″ × 3-1/2″) per post base assembly.
Comparison
- Post Base Twin Rail (this item): Anchors post and captures two 2×4 rails for in-line or corner layouts.
- Post Base Single Rail: Same concept but for one 2×4 rail — ideal for ends or transitions.
- 2×4 Top Rail Saddle: Attaches a single top rail directly to a post when a base plate isn’t required at that location.
Planning a full rail package and want everything to match? Contact us and we’ll help you kit posts, saddles, screws, and accents for a clean, code-conscious build.
