Product Description
Galvanized Purlin “Greenhouse” Clamps — Multiple Sizes Available
- Right-angle connectors — Join two round pipes at 90° to build ridges, purlins, and cross-braces for greenhouses and pipe frames.
- Galvanized steel — Two-piece pressed clamps for durable, weather-resistant joints.
- Three size pairs — 1-3/8" × 1-3/8", 1-5/8" × 1-3/8", and 1-5/8" × 1-5/8".
- Simple bolt-up — Through-bolted design installs quickly with common hardware.
Make strong, square 90° connections using standard fence/greenhouse tubing. For continuous ridge or purlin runs, add Top Rail Sleeves to splice rails end-to-end, and source matching pipe from our Residential Framework section for consistent outside diameters and finish.
Why Choose This
- Fast framing — Build ridge and purlin grids without special tools.
- Weatherable — Galvanized construction stands up to outdoor environments.
- Flexible sizing — Three size pairs cover common bow and purlin O.D.s.
Specifications
| Type | Two-piece cross / purlin clamp for 90° pipe-to-pipe connections |
| Available Size Pairs | 1-3/8" × 1-3/8"; 1-5/8" × 1-3/8"; 1-5/8" × 1-5/8" |
| Material / Finish | Galvanized pressed steel; through-bolted |
| Typical Fastener | 5/16" carriage bolts (length varies with pipe O.D.) |
| Typical Uses | Greenhouse ridge & purlins; hoop houses; pipe frameworks; temporary structures |
Installation (Quick Steps)
- Verify outside diameters for both intersecting pipes and select the matching clamp size pair.
- Seat clamp halves over the crossing pipes; insert through-bolts.
- Tighten evenly and re-check square along the run.
Buying Guide
- Match by O.D. — 1-3/8" top rail is common for purlins; 1-5/8" is common for bows.
- Plan quantity — Budget one clamp set per cross-joint on each purlin line.
- Accessories — Use Top Rail Sleeves to extend rails; select matching framework for consistent fit and corrosion protection.
Frequently Asked Questions
- What sizes are available for Galvanized Purlin “Greenhouse” Clamps?
- These clamps are offered in 1-3/8" × 1-3/8", 1-5/8" × 1-3/8", and 1-5/8" × 1-5/8" to cover common bow and purlin tubing sizes.
- What fasteners should I use with Galvanized Purlin “Greenhouse” Clamps?
- Most builds use 5/16" carriage bolts to through-bolt the clamp halves. Choose a bolt length that accommodates your pipe O.D. and allows full nut engagement.
- Can I use Galvanized Purlin “Greenhouse” Clamps with standard chain-link top rail?
- Yes. These clamps are designed around common fence tubing sizes and work well with 1-3/8" top rail used as purlins or ridges in greenhouse frames.
Comparison
- Galvanized Purlin Clamps (this item) — Two-piece, galvanized right-angle connectors for bow-to-purlin and cross-brace joints.
- Top Rail Sleeves — Galvanized splice sleeves to join top-rail sections end-to-end for long ridges.
- Galvanized Framework — Matching pipe in common O.D.s for bows, purlins, and perimeter framing.
