Aircraft Cable Tension Meters

Q: What is the main operational difference between the Tensitron ACX-1 Digital and ACM Mechanical Tension Meters?

On the Tensitron ACM Mechanical Series , the number displayed on the analog dial face is a pointer reference rather than a direct pound value; the technician locates the pointer reading on the calibration chart attached to the back of the meter under the tested cable diameter column to read the true tension in pounds. On the Tensitron ACX-1 Digital Series , the technician selects the cable size on the digital menu and rotates the riser, and the meter calculates and displays the exact tension directly on the LCD screen in lb , kg , or daN —eliminating lookup tables and interpolation errors.

Q: What cable construction are these meters calibrated for, and how often should they be recalibrated?

Standard ACX-1 and ACM meters are factory-calibrated on uncoated stainless steel 7x19 aircraft cables (and 7x7 construction for 1/16" cables). Because cable diameter tolerances (±0.003"), coatings, or different strand constructions affect deflection stiffness, always verify cable diameter before testing. Tensitron recommends factory NIST-traceable recalibration at one-year intervals , or sooner if required by your aviation quality management system or regulatory authority.

ABQ Industrial offers industry-standard Digital Tension Meters and Mechanical Aircraft Cable Tension Meters from Tensitron (part of our comprehensive Tension Meters catalog). Engineered for aviation maintenance, repair, and overhaul (MRO) technicians, airframe manufacturers, and military flight-line crews, the Tensitron ACX-1 Digital Aircraft Cable Tension Meters and Tensitron ACM Mechanical Aircraft Cable Tension Meters provide fast, one-handed tension verification on uncoated stainless steel 7x19 and 7x7 aircraft control cables.

Whether rigging low-tension secondary control cables down to 0.5 lb, inspecting primary flight control cables in tight fuselage bays, servicing British/European CWT-sized airframes, or testing high-tension safety barrier cables up to 1,200 lb, these NIST-traceable instruments eliminate loose risers and deliver repeatable tension readings across Fractional Inch (1/16" to 1/4"), CWT (5 to 25 CWT), and Metric (2.0 mm to 4.5 mm) cable diameters.

Aircraft Cable Tension Measurement by Application

Selecting the proper aircraft cable tensiometer depends on your target cable diameter specification (Fractional Inch, CWT, or Metric), required tension range, and whether your maintenance workflow calls for direct digital readouts or battery-free mechanical operation:

1. Primary & Secondary Flight Control Cables (Aileron, Elevator, Rudder & Trim Systems)

Proper control cable rigging is critical to prevent control surface flutter, sluggish response, or premature pulley and airframe wear. Technicians must verify cable tension across multiple stations along the cable run and compensate for ambient temperature.

Target Cables: Uncoated 7x7 (1/16") and 7x19 (3/32", 1/8", 5/32", 3/16", 1/4") stainless steel control cables.
Recommended Solutions: For direct digital readings in pounds (lb), kilograms (kg), or decaNewtons (daN) without consulting lookup charts, choose from the Tensitron ACX-1 Digital Series—including the low-range ACX-25-1 (0.5–25 lb), ACX-100-1 (1–100 lb), ACX-250-1 (1–250 lb), or ACX-500-1 (1–500 lb, NSN 6635-01-679-0803). For rugged, battery-free field service, choose the ACM-100, ACM-200, ACM-300, or ACM-400.

2. Blind Access & Confined Airframe Compartments

Aircraft control cables are frequently routed behind bulkheads, under cabin floorboards, inside wing roots, and through narrow tailcones where the technician cannot see the instrument face while engaging the cable.

Target Environment: Restricted-access inspection panels, behind instrument consoles, and crowded nacelle or empennage bays.
Recommended Solutions: Both product families feature compact, narrow-profile heads for one-handed engagement. The mechanical Tensitron ACM Series incorporates a mechanical Memory Lock Pointer that locks the dial pointer at the exact reading until viewed and released. The digital Tensitron ACX-1 Series provides push-button data storage (logging individual readings and multi-point averages) plus a color-bar graphic backlit display and audible beep notification when a reading is captured.

3. International, Helicopter & Mixed-Fleet MRO (Fractional Inch, CWT & Metric Cables)

MRO facilities servicing a combination of US, British, and European fixed-wing aircraft and rotorcraft encounter fractional inch cables alongside British CWT (hundredweight) cables and Metric (mm) cables.

Target Cables: British 5, 10, 15, 20, and 25 CWT cables and Metric 2.0 mm, 2.5 mm, 3.5 mm, 4.0 mm, and 4.5 mm cables.
Recommended Solutions: Eliminate the need to purchase separate meters for each fleet standard by selecting combination models from the ACX-1 Digital Series—such as the ACX-100-CMB-1 or ACX-250-CMB-1 (combining Fractional Inch and 5–25 CWT in one unit), or the ACX-25-FM-1, ACX-100-FM-1, ACX-250-FM-1, and ACX-500-FM-1 (combining Fractional Inch and Metric calibrations). Dedicated CWT models include the digital ACX-250-CWT-1 and mechanical ACM-150-CWT and ACM-300-CWT.

4. Heavy-Duty Rigging, Safety Barriers & Arresting Gear Cables (Up to 1,200 lb)

Heavy airframe tie-downs, cargo handling systems, and runway safety barrier cables operate at significantly higher tensions than standard cockpit control runs.

Target Cables: High-tension 1/8" to 1/4" structural/control cables and safety barrier cables.
Recommended Solutions: The mechanical Tensitron ACM-600 measures 1/8", 5/32", 3/16", and 1/4" cables from 40 to 600 lb (19–272 kg), while the specialized digital Tensitron ACX-1200-SCB-1 measures safety barrier cables from 50 to 1,200 lb.

Aircraft Cable Tension Meter Selection Guide (ACX-1 Digital vs. ACM Mechanical)

Click any model number in the reference table below to view individual specifications, pricing, and ordering options across all 16 Tensitron ACX-1 Digital models and 7 Tensitron ACM Mechanical models.

Model Number	Type & Display	Tension Range	Resolution / Accuracy	Fractional Inch Cables	Metric (mm) Cables	CWT Cable Sizes
Tensitron ACX-1 Digital Aircraft Cable Tension Meters (16 Models — Direct Readout in lb, kg, or daN)
ACX-25-1	Digital Color LCD	0.5 – 25 lb	0.2 lb res. / ±2% FS	`1/16"`, `3/32"`	—	—
ACX-25-M-1	Digital Color LCD	0.5 – 25 lb	0.2 lb res. / ±2% FS	—	`2.0`, `2.5 mm`	—
ACX-25-FM-1	Digital Color LCD	0.5 – 25 lb	0.2 lb res. / ±2% FS	`1/16"`, `3/32"`	`2.0`, `2.5 mm`	—
ACX-100-1	Digital Color LCD	1 – 100 lb	0.2 lb res. / ±2% FS	`1/16"`, `3/32"`, `1/8"`, `5/32"`	—	—
ACX-100-M-1	Digital Color LCD	1 – 100 lb	0.2 lb res. / ±2% FS	—	`2.0`, `2.5`, `3.5 mm`	—
ACX-100-FM-1	Digital Color LCD	1 – 100 lb	0.2 lb res. / ±2% FS	`1/16"`, `3/32"`, `1/8"`, `5/32"`	`2.0`, `2.5`, `3.5 mm`	—
ACX-100-CMB-1	Digital Color LCD	1 – 100 lb	0.2 lb res. / ±2% FS	`1/16"`, `3/32"`, `1/8"`, `5/32"`	—	`5`, `10`, `15`, `20`, `25 CWT`
ACX-250-1	Digital Color LCD	1 – 250 lb	0.2 lb res. / ±2% FS	`1/16"`, `3/32"`, `1/8"`, `5/32"`, `3/16"`	—	—
ACX-250-M-1	Digital Color LCD	1 – 250 lb	0.2 lb res. / ±2% FS	—	`2.0`, `2.5`, `3.5`, `4.0 mm`	—
ACX-250-FM-1	Digital Color LCD	1 – 250 lb	0.2 lb res. / ±2% FS	`1/16"`, `3/32"`, `1/8"`, `5/32"`, `3/16"`	`2.0`, `2.5`, `3.5`, `4.0 mm`	—
ACX-250-CWT-1	Digital Color LCD	1 – 250 lb	0.2 lb res. / ±2% FS	—	—	`5`, `10`, `15`, `20`, `25 CWT`
ACX-250-CMB-1	Digital Color LCD	1 – 250 lb	0.2 lb res. / ±2% FS	`1/16"`, `3/32"`, `1/8"`, `5/32"`, `3/16"`	—	`5`, `10`, `15`, `20`, `25 CWT`
ACX-500-1	Digital Color LCD	1 – 500 lb	1 lb res. / ±2% FS	`1/8"`, `5/32"`, `3/16"`, `1/4"` (NSN 6635-01-679-0803)	—	—
ACX-500-M-1	Digital Color LCD	1 – 500 lb	1 lb res. / ±2% FS	—	`2.5`, `3.5`, `4.0`, `4.5 mm`	—
ACX-500-FM-1	Digital Color LCD	1 – 500 lb	1 lb res. / ±2% FS	`3/32"`, `1/8"`, `5/32"`, `3/16"`, `1/4"`	`2.5`, `3.5`, `4.0`, `4.5 mm`	—
ACX-1200-SCB-1	Digital Color LCD	50 – 1,200 lb	5 lb res. / ±3% FS	`3/32"` (Safety Barrier)	—	—
Tensitron ACM Mechanical Aircraft Cable Tension Meters (7 Models — Battery-Free Analog Dial with Memory Lock)
ACM-100	Analog Dial + Memory Lock	5 – 100 lb (3–45 kg)	±4% Full-Scale	`1/16"`, `3/32"`, `1/8"`, `5/32"`	—	—
ACM-200	Analog Dial + Memory Lock	20 – 200 lb (12–90 kg)	±4% Full-Scale	`1/16"`, `3/32"`, `1/8"`, `5/32"`, `3/16"`, `1/4"`	—	—
ACM-300	Analog Dial + Memory Lock	40 – 300 lb (19–136 kg)	±6% Full-Scale	`3/32"`, `1/8"`, `3/16"`, `1/4"`	—	—
ACM-400	Analog Dial + Memory Lock	40 – 400 lb (19–181 kg)	±6% Full-Scale	`3/32"`, `1/8"`, `5/32"`, `3/16"`	—	—
ACM-600	Analog Dial + Memory Lock	40 – 600 lb (19–272 kg)	±8% Full-Scale	`1/8"`, `5/32"`, `3/16"`, `1/4"`	—	—
ACM-150-CWT	Analog Dial + Memory Lock	10 – 150 lb (5–68 kg)	±4% Full-Scale	—	—	`5`, `10`, `15`, `20`, `25 CWT`
ACM-300-CWT	Analog Dial + Memory Lock	40 – 300 lb (19–136 kg)	±6% Full-Scale	—	—	`10`, `15`, `20`, `25 CWT`

Key Technical Capabilities Across This Products

Built-In Rotary Riser (No Loose Risers to Drop or Lose): Both the Tensitron ACX-1 and Tensitron ACM feature an integrated, rotatable center riser. Operators simply rotate the built-in riser to match the cable diameter—eliminating the FOD (Foreign Object Debris) hazard of loose, detachable risers inside an airframe.
Direct Digital Readouts vs. Battery-Free Mechanical Reliability: Choose the ACX-1 Digital Series for ±2% full-scale accuracy (±3% on ACX-1200-SCB-1), instant conversion between lb, kg, and daN, rechargeable NiMH battery power (non-lithium for safe air transport), and optional Analog (-A) or RS-232 Serial (-E) output; or select the ACM Mechanical Series for 100% battery-free readiness with a calibration lookup chart permanently attached to the back of the meter.
Custom Factory Calibrations Available: Standard models are calibrated for uncoated stainless steel 7x19 cables (7x7 on 1/16" cables). Custom calibrations are available upon request for nylon-coated or galvanized cables, 1x19 strand constructions, or user-supplied wire rope samples.
Flight-Ready Kit & NIST-Traceable Calibration: Every Tensitron aircraft tensiometer ships complete with a durable protective carrying case with custom foam inserts, operating instructions, and a NIST-Traceable Calibration Certificate (ACX-1 kits also include a rechargeable NiMH battery assembly, power supply, and Cable Diameter Gauge).

ABQ Industrial offers industry-standardDigital Tension Meters and Mechanical Aircraft Cable Tension Meters from Tensitron (part of our comprehensive Tension Meters catalog). Engineered for aviation maintenance, repair, and overhaul (MRO) technicians, airframe manufacturers, and military flight-line crews, the Tensitron ACX-1 Digital Aircraft Cable Tension Meters and Tensitron ACM Mechanical Aircraft Cable Tension Meters provide fast, one-handed tension verification on uncoated stainless steel 7x19 and 7x7 aircraft control cables.

F.A.Q.

What is the main operational difference between the Tensitron ACX-1 Digital and ACM Mechanical Tension Meters?

On the Tensitron ACM Mechanical Series, the number displayed on the analog dial face is a pointer reference rather than a direct pound value; the technician locates the pointer reading on the calibration chart attached to the back of the meter under the tested cable diameter column to read the true tension in pounds. On the Tensitron ACX-1 Digital Series, the technician selects the cable size on the digital menu and rotates the riser, and the meter calculates and displays the exact tension directly on the LCD screen in lb, kg, or daN—eliminating lookup tables and interpolation errors.

How do I take a tension reading in a blind or obstructed area where I cannot see the display?

Both series are specifically designed for blind airframe access:

On the ACM Mechanical Series: Engage the meter onto the cable, slide the Memory Lock lever to freeze the pointer in position, disengage the meter from the cable, and bring the instrument into view to read the locked pointer value.
On the ACX-1 Digital Series: Engage the meter onto the cable and press the storage button; the meter emits an audible beep and changes screen backlight color to confirm that the reading has been captured in memory for viewing once removed from the bay.

Why does the built-in riser matter for aviation MRO and FOD prevention?

Traditional mechanical tensiometers require swapping small, detachable metal blocks (risers) for different cable diameters—creating a serious Foreign Object Debris (FOD) risk if a loose riser is dropped inside a flight control bay or engine nacelle. Both the ACX-1 and ACM permanently house a multi-position rotary riser on the instrument frame: you simply lift and turn the captive riser to the required number or letter for your cable diameter.

What cable construction are these meters calibrated for, and how often should they be recalibrated?

Standard ACX-1 and ACM meters are factory-calibrated on uncoated stainless steel 7x19 aircraft cables (and 7x7 construction for 1/16" cables). Because cable diameter tolerances (±0.003"), coatings, or different strand constructions affect deflection stiffness, always verify cable diameter before testing. Tensitron recommends factory NIST-traceable recalibration at one-year intervals, or sooner if required by your aviation quality management system or regulatory authority.