A crescent yoke plate is a curved, two-point yoke fitting installed at the bottom of a suspension or tension insulator string to hold a twin-bundle (two-conductor) assembly in balance. The crescent profile places two suspension clamp or spacer attachment points at equal radius from the string center, so both subconductors hang at the same height and share the load evenly. In bundle conductor design — standard on transmission lines and increasingly used on high-capacity distribution — the yoke plate is what turns two separate conductors into one mechanically coherent assembly.
Getting bundle geometry right starts here. If one attachment point sits even slightly higher than the other, the lower subconductor carries more static tension, the spacers see cyclic twist, and the entire bundle begins to walk or rotate in wind. The crescent shape solves this by construction rather than by field adjustment: both holes are cast and machined on the same radius, and the curved web between them gives clearance for the clamps and jumper hardware. We cast the plate in ductile iron for ductility at the two heavily loaded clevis lugs and galvanize it to ASTM A153 for decades of outdoor exposure.
| Item | Typical Value |
|---|---|
| Material | Ductile iron ASTM A536 (65-45-12 typical); malleable iron on request |
| Strength Rating | Ultimate tensile strength typically 25,000–50,000 lbs class for the twin-point assembly |
| Hole Diameter | 13/16" clevis bores typical; 1" heavy class |
| Hole Spacing | Subconductor spacing typically 18"–20" center-to-center per bundle design |
| Finish | Hot-dip galvanized per ASTM A153 |
| Suitable Insulator String | Suspension insulator strings and polymer long-rod assemblies with twin-bundle clamps |
| Weight Range | Approx. 3–7 kg per piece |
| Casting Process | Green sand casting, shot-blasted, bores and seat faces machined |
| Standard | Manufactured to ANSI C29-series bundle hardware conventions |
The crescent yoke plate hangs from the string's socket tongue or ball fitting at its center lug and receives the two subconductor suspension clamps at its outboard holes. From project experience we recommend:
Measuring the installed subconductor spacing before ordering — the plate's hole spacing must match the bundle design, typically 18"–20", or the spacers will be forced into twist.
Checking plate level with a string level after hanging; residual tilt indicates mismatched string hardware lengths on one side.
On angled structures, pair the crescent plate with a yoke tension adjusting fitting so the load can be trimmed between subconductors.
Typical users are transmission maintenance programs reconductoring short spans with twin bundles, substation drop assemblies, and river or highway crossings where twin-bundle geometry is specified for ampacity. The crescent's shallow profile also suits short crossarm clearances where a full triangular yoke would not fit.
We cast crescent yoke plates to customer drawings. Common customizations include altered subconductor spacing for non-standard bundles, drilled or tapped center lugs for specific tongue fittings, thicker web sections for ice-loading districts, and matched marking for utility asset tracking. Sample lead time is typically 3–4 weeks for larger castings, with first-article dimensional reports.
Inspection covers: bore diameters and hole-spacing measurement with CMM or pin gauges; radius symmetry check between the two attachment points, which governs load balance; hot-dip galvanizing thickness verification per ASTM A153; and tensile sampling to confirm the rated assembly strength. Because the plate is a large-section casting, we also screen for shrinkage near the lugs before galvanizing. Parts ship individually crated or carton-packed with protective spacers, palletized for export.
Q: What conductor bundles suit a crescent yoke plate?
A: Two-conductor (twin) bundles, with attachment points typically spaced 18"–20" apart. For three subconductors, see our delta and tri-bundle yoke plates.
Q: Why crescent-shaped instead of a straight bar?
A: The curve gives subconductor clamps clearance from each other and from the string hardware while keeping both attachment holes on the same radius for load balance.
Q: Can the plate be used on dead-end assemblies?
A: Yes, with appropriate strain clamps, though many dead-ends use dedicated tension yokes — send us the assembly drawing to confirm.
Adjustable Pipe Saddle Support with U-Bolt — another ductile iron support casting line
Send your bundle spacing and string hardware list — we will confirm the crescent yoke plate dimensions and quote castings with matched pins.
WhatsApp: +86 185 6156 7088, or submit the RFQ form for sample castings and reports.
Need a formal quotation? Send your Crescent Yoke Plate for Twin-Bundle Conductor Assemblies drawing, quantity and target price through our quotation request form — it goes straight to the foundry inbox, and we reply with a priced offer, material certificate draft and production lead time within one business day.
Professional technical research and development team to provide customers with the best solution.
Jimo District, Qingdao City, Shandong Province, China
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