overhead line strain clamp

High-strength tensioning clamps are suitable for wire terminals and force connections. They are corrosion-resistant and quick to assemble. Sample inspection and bulk purchase quotations are available.
High-strength strain clamps are used to secure conductors and withstand tension. Suitable for ACSR, AAC, and copper conductors. They are corrosion-resistant, hot-dip galvanized, and offer high mechanical strength and quick installation.
Strain relief clamps relieve cable pressure, ensuring smooth power flow.

Description

The tension clamp is a bolted single-tension hardware used to create a secure, load-bearing connection for conductors and cables on overhead transmission and distribution lines. Also known as a dead end strain clamp or quadrant strain clamp, this bolted type tension clamp delivers reliable mechanical support and strain relief for both insulators and conductors.
Our tension clamps are compatible with common overhead line fittings such as clevis and socket eye, making them ideal for powerline hardware, transmission line accessories, and distribution line installations.

We offer two material series to suit different application needs: the NLL series (aluminum alloy tension clamp) provides excellent corrosion resistance and lightweight strength for long-span transmission lines; the NLD series (malleable iron tension clamp) offers high impact toughness for demanding mechanical loads. Each series is sized by conductor diameter (NLL-1 through NLL-5 / NLD-1 through NLD-5) to match a wide range of conductors and ACSR cables.
Designed for easy installation and long service life, our tension clamps (dead-end clamps / strain relief clamps) meet industry requirements for safety and durability in harsh outdoor environments.
Ultra-High Mechanical Strength — Designed according to IEC/ANSI standards, with a breaking strength of up to 120 kN (customizable), suitable for 10–220 kV lines.

Model	Conductor Diameter Range (mm)	Compatible Conductor Types (examples)	Ultimate Breaking Strength / Min. Breaking Force (kN)	Recommended Working Tension (kN)	Unit Weight (kg)	Bolt Size	Typical Overall Dimensions L×W×H (mm)	Material	Surface Treatment	Compatible Fittings	Recommended Installation Torque (Nm)
NLL-1 / NLD-1	6 — 10	AAC / ACSR 6–10 mm	25	8	NLL: 0.9 / NLD: 1.1	M12	150×45×30	NLL: Aluminum alloy; NLD: Malleable iron	NLL: anodized or passivated (optional); NLD: hot-dip galvanized	clevis (Y-clevis), socket eye	50 — 70
NLL-2 / NLD-2	10 — 14	AAC / ACSR / AAAC	40	12	NLL: 1.6 / NLD: 1.9	M16	200×60×35	same as above	same as above	clevis, socket eye, pin fittings	90 — 120
NLL-3 / NLD-3	14 — 18	Medium-size ACSR conductors	65	20	NLL: 2.8 / NLD: 3.4	M20	260×75×45	same as above	same as above	clevis, socket eye, strain insulator links	140 — 180
NLL-4 / NLD-4	18 — 22	Large ACSR / multi-strand conductors	95	30	NLL: 4.5 / NLD: 5.4	M22	320×95×60	same as above	same as above	clevis, socket eye, hanger fittings	180 — 220
NLL-5 / NLD-5	22 — 28	Extra-large ACSR conductors	140	45	NLL: 6.8 / NLD: 8.2	M24	380×110×80	same as above	same as above	clevis, socket eye, special end fittings	200 — 260

FAQ

Q: Can you provide non-standard customization?
A: Yes, we can—including adapting to different wire diameters, special coatings, and test holes. Please provide a wire sample or technical drawing.

Q: Do you provide samples?
A: We can provide samples (sample fee and shipping fee included). The sample fee can be deducted from mass production orders.