Product Summary

Longze Heavy-Duty Pole Clamps (also known as U-Brackets or Saddle Clamps) are engineered for securing secondary racks, street lights, and transformer brackets to round or polygonal utility

poles. Manufactured in Yongnian, China, our clamps are fabricated from high-grade structural steel and hot-dip galvanized to ensure maximum clamping force and corrosion resistance in the most

demanding outdoor environments.

• ✔ Superior Grip Strength: Precision-curved design ensures a tight, non-slip fit around steel, concrete, or wood poles.

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• ✔ Heavy-Duty Construction: Thick-gauge steel plates resist deforming under high mechanical tension and environmental loads.

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• ✔ Universal Compatibility: Pre-punched slots allow for easy integration with various pole line hardware and insulator strings.

• Standards: ASTM A123, ISO 1461, ANSI C135.

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• Pole Diameter Range: 100mm - 500mm (4" - 20").

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• Steel Thickness: 4mm - 12mm (1/6" - 1/2").

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• Material Grade: Q235B, Q355B, ASTM A36.

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• Surface Finish: Hot Dip Galvanized (HDG), thickness ≥86μm.

Mechanical Properties & Material Standards

• Matching the steel grade to the structural requirements of the transmission line.

• Material Grade	Yield Strength	Tensile Strength	Elongation	応用
  Q235B (A36)	235 MPa	370 - 500 MPa	≥ 25%	Distribution Line Fittings
  Q355B (A572)	355 MPa	470 - 630 MPa	≥ 21%	Transmission Pole Brackets
  High-Strength	420 MPa	520 - 680 MPa	≥ 19%	Heavy Transformer Mounts

Standard Cross Arm Dimensions

• Common angle steel configurations for standard utility pole mounting.

• Clamp Diameter (mm)	Strap Width (mm)	Thickness (mm)	Bolt Hole Size	Max Load (kN)
  150 - 200 mm	40 - 50 mm	5 - 6 mm	14 - 18 mm	10 - 15 kN
  200 - 300 mm	50 - 60 mm	6 - 8 mm	16 - 20 mm	15 - 25 kN
  300 - 400 mm	60 - 80 mm	8 - 10 mm	18 - 22 mm	25 - 45 kN
  400 - 500 mm	80 - 100 mm	10 - 12 mm	20 - 24 mm	45 - 70 kN

Galvanizing & Corrosion Resistance

• Ensuring 30+ years of service life in corrosive environments.

• 環境	HDG Standard	Zinc Weight (g/m²)	Zinc Thickness	Service Life
  Rural	ISO 1461	500 - 550 g/m²	70 - 75 μm	50+ Years
  Industrial	ASTM A123	610 - 700 g/m²	≥ 86 μm	40+ Years
  Coastal	Marine Grade	800 - 950 g/m²	110 - 130 μm	30+ Years

Avoid Pitfalls:

• Bending Stress Cracks: We prevent structural failure by utilizing controlled-temperature hydraulic bending, ensuring no micro-fractures occur at the radius of the clamp even for 12mm thick steel.

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• Zinc Buildup in Bolt Holes: Every clamp is inspected after the galvanizing bath. We clear all excess zinc from the mounting holes to ensure bolts fit perfectly during field installation.

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• Edge Burrs & Sharp Corners: To protect lineman safety and prevent conductor fraying, all Longze clamps undergo mechanical deburring to ensure smooth, rounded edges.

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Perfect Fit Assembly:

• Complete Clamp Sets: Every pole clamp can be supplied with its matched High-Strength Carriage Bolts, Square Washers、 そして Hex Nuts for a ready-to-install solution.

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• Custom Geometries: We can manufacture round, square, or custom polygonal clamps based on your specific pole profile and equipment load requirements.

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Quality Control & Logistics:

• ISO 9001 Certified: 5-step QC including steel chemical analysis, fitment testing on sample pole sections, and HDG thickness verification.

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• Sea-Worthy Packaging: Clamps are bundled with heavy-duty steel strapping and protected by industrial-grade stretch wrap on Fumigation-Free Pallets.

• Q: Can you manufacture clamps for tapered octagonal steel poles? A: Yes, our Yongnian factory uses CNC bending equipment to produce custom-radius clamps that match the specific taper of your transmission poles.

• Q: What is the lead time for a bulk order of 250mm diameter clamps? A: For standard sizes, we typically maintain raw material stock and can complete fabrication and galvanizing within 12 - 18 days.

• Email:eric@lzfastener.com  What'sApp:+86 15350500528 WeChat:+86 18830006928 or 15350500528