Motion Controls & Safety

AMLOK RCH Hydraulic Rod Lock

Reliable, High-Force Locking for Heavy-Duty Applications

Need maintenance or a rebuild? Our US-based team provides comprehensive RCH rod lock service and repair, from seal kits to complete overhauls. Contact us today to restore performance and extend the life of your equipment.

Request Support
AMLOK RCH Hydraulic Rod Lock

Reliable, High-Force Locking for Heavy-Duty Applications

The AMLOK RCH Series rod locks provide fail-safe, hydraulic-actuated clamping designed specifically for NFPA hydraulic cylinders. With robust spring-engaged mechanisms, these locks deliver secure holding forces ranging from approximately 1,100 to 80,000 lbf, making them ideal for heavy industrial machinery, presses, and large machine tools. Their compact, through-hole NFPA design integrates seamlessly into standard cylinder installations, providing bi-directional holding with zero backlash.

Note: For dynamic braking of moving loads or extreme safety-critical scenarios, please consult our engineers – in some cases a specialized solution or a SITEMA safety device may be recommended.

Key Benefits
High Clamping Force Up to 80,000 lbf holding capacity.
Fail-Safe Design Spring-engaged, hydraulically released.
Compact Integration NFPA-standard mount for easy installation.
Precision Holding Maintains exact positioning without drift.
Durable & Reliable Engineered for demanding industrial environments.

Note: For extremely unusual or severe operating conditions – high temperature, submerged operation, etc. – please contact us. Custom RCH designs or alternative solutions can be provided.

Proven in Demanding Applications

The AMLOK RCH Series is suited for any heavy-duty application where a hydraulic axis must be securely locked in place to prevent movement. 

Applications
Injection Molding & Die Casting Machines
Hydraulic Presses and Forming Machines
Machine Tool Axes (Vertical/Horizontal)
Amusement and Theatrical Lifts
Scissor Lifts & Elevating Work Platforms
Material Handling & Industrial Automation
Heavy Mobile Equipment
Municipal and Utility Vehicles
Energy & Infrastructure
Any Critical Hold Application

Need maintenance or a rebuild? Our US-based team provides comprehensive RCH rod lock service and repair, from seal kits to complete overhauls. Contact us today to restore performance and extend the life of your equipment.

Request Support
AMLOK RCH Hydraulic Rod Lock

Technical Overview

The RCH Series uses a mechanical spring mechanism to clamp the rod immediately when hydraulic pressure is removed. A hydraulic piston retracts the clamp when system pressure is restored. This makes the RCH ideal for fail-safe operation: it holds the load when pressure is lost and only releases when commanded.

Available in standard bore/rod sizes to match NFPA dimensions. Custom sizing or mounting options available upon request.

Corrosion-Resistant Construction

Stainless steel or electroless nickel-plated housing withstands corrosive or washdown conditions.

High-Temperature Seals

Viton® seals handle high temperatures and aggressive fluids, ensuring reliable performance in harsh conditions.

Environmental Protections

Wipers/scrapers prevent contamination in dusty or dirty environments; fully sealed units are available for food processing, chemical, or underwater use.

Tandem Configuration

For maximum holding force, dual RCH units can be mounted in tandem to double the holding capacity.

AMLOK RCH Hydraulic Rod Lock

Technical Specifications

RCH Hydraulic Rod Locks
Showing 56 of 56 models
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Product ID3D CADBuy OnlineRod Diameter² (in)Rod Diameter Tolerance (in)Cylinder Bore Diameter (in)Minimum Release Pressure (PSI)Maximum Holding Force (lbs)A±.015 (in)B±.015 (in)C±.03 (in)D±.03 (in)E±.015 (in)F±.03 (in)G±.03 (in)J±.03 (in)K±.015 (in)L±.03 (in)M±.03 (in)R±.005 (in)TF±.005 (in)FB±.015 (in)PortWeight (lbs)Volume To Cycle
RCH-062150-0750.625+0.000/-0.0031.5075011002.481.250.384.371.632.130.750.790.233.550.781.6253.4370.44SAE 411.00.4 in (6 mm)
RCH-062150-1000.625+0.000/-0.0031.50100018002.481.250.384.371.632.130.750.790.233.550.781.6253.4370.44SAE 411.00.4 in (6 mm)
RCH-062150-1500.625+0.000/-0.0031.50150022502.481.250.384.371.632.130.750.790.233.550.781.6253.4370.44SAE 411.00.4 in (6 mm)
RCH-100150-0751.000+0.000/-0.0031.5075012002.761.630.504.371.751.880.870.790.233.450.781.6253.4370.44SAE 413.00.4 in (6 mm)
RCH-100150-1001.000+0.000/-0.0031.50100020002.761.630.504.371.751.880.870.790.233.450.781.6253.4370.44SAE 413.00.4 in (6 mm)
RCH-100150-1501.000+0.000/-0.0031.50150023002.761.630.504.371.751.880.870.790.233.450.781.6253.4370.44SAE 413.00.4 in (6 mm)
RCH-100200-0751.000+0.000/-0.0032.0075029003.741.630.355.372.252.900.851.000.234.3702.0504.1250.56SAE 425.01.0 in (16 mm)
RCH-100200-1001.000+0.000/-0.0032.00100052003.741.630.355.372.252.900.851.000.234.3702.0504.1250.56SAE 425.01.0 in (16 mm)
RCH-100200-1501.000+0.000/-0.0032.00150056003.741.630.355.372.252.900.851.000.234.3702.0504.1250.56SAE 425.01.0 in (16 mm)
RCH-100250-0751.000+0.000/-0.0032.5075029004.131.630.505.982.503.401.001.500.235.1202.5504.6250.56SAE 436.01.0 in (16 mm)
RCH-100250-1001.000+0.000/-0.0032.50100052004.131.630.505.982.503.401.001.500.235.1202.5504.6250.56SAE 436.01.0 in (16 mm)
RCH-100250-1501.000+0.000/-0.0032.50150060004.131.630.505.982.503.401.001.500.235.1202.5504.6250.56SAE 436.01.0 in (16 mm)
RCH-137200-0751.375+0.000/-0.0032.0075027003.742.130.505.372.253.001.001.500.234.6502.0504.1250.56SAE 424.00.6 in (10 mm)
RCH-137200-1001.375+0.000/-0.0032.00100027003.742.130.505.372.253.401.001.500.234.6502.0504.1250.56SAE 424.00.6 in (10 mm)
RCH-137200-1501.375+0.000/-0.0032.00150052003.742.130.505.372.253.401.001.500.234.6502.0504.1250.56SAE 424.00.6 in (10 mm)
RCH-137250-0751.375+0.000/-0.0032.5075027004.132.130.505.982.503.500.901.500.235.1202.5504.6250.56SAE 434.01.0 in (16 mm)
RCH-137250-1001.375+0.000/-0.0032.50100052004.132.130.505.982.503.500.901.500.235.1202.5504.6250.56SAE 434.01.0 in (16 mm)
RCH-137250-1501.375+0.000/-0.0032.50150060004.132.130.505.982.503.500.901.500.235.1202.5504.6250.56SAE 434.01.0 in (16 mm)
RCH-137325-0751.375+0.000/-0.0033.2575082005.702.130.457.753.254.501.102.600.286.5003.2505.8750.69SAE 453.01.8 in (30 mm)
RCH-137325-1001.375+0.000/-0.0033.251000115005.702.130.457.753.254.501.102.600.286.5003.2505.8750.69SAE 453.01.8 in (30 mm)
RCH-137325-1501.375+0.000/-0.0033.251500160005.702.130.457.753.254.501.102.600.286.5003.2505.8750.69SAE 453.01.8 in (30 mm)
RCH-175250-0751.750+0.000/-0.0032.5075035004.332.380.706.002.503.900.962.440.325.910.782.554.6300.56SAE 436.00.7 in (11.5 mm)
RCH-175250-1001.750+0.000/-0.0032.50120052004.332.380.706.002.503.900.962.440.325.910.782.554.6300.56SAE 436.00.7 in (11.5 mm)
RCH-175250-1501.750+0.000/-0.0032.50200075004.332.380.706.002.503.900.962.440.325.910.782.554.6300.56SAE 436.00.7 in (11.5 mm)
RCH-175325-0751.750+0.000/-0.0033.2575082005.702.500.637.753.254.670.932.600.306.5003.2505.8750.69SAE 469.01.8 in (30 mm)
RCH-175325-1001.750+0.000/-0.0033.251000115005.702.500.637.753.254.670.932.600.306.5003.2505.8750.69SAE 469.01.8 in (30 mm)
RCH-175325-1501.750+0.000/-0.0033.251500160005.702.500.637.753.254.670.932.600.306.5003.2505.8750.69SAE 469.01.8 in (30 mm)
RCH-175400-0751.750+0.000/-0.0034.0075082006.102.500.508.383.504.381.232.200.346.5003.8206.3750.69SAE 481.02.4 in (39 mm)
RCH-175400-1001.750+0.000/-0.0034.001000120006.102.500.508.383.504.381.232.200.346.5003.8206.3750.69SAE 481.02.4 in (39 mm)
RCH-175400-1501.750+0.000/-0.0034.001500170006.102.500.508.383.504.381.232.200.346.5003.8206.3750.69SAE 481.02.4 in (39 mm)
RCH-200325-0752.000+0.000/-0.0033.2575082005.702.680.587.753.254.501.102.600.296.5003.2505.8750.69SAE 477.01.8 in (29.5 mm)
RCH-200325-1002.000+0.000/-0.0033.251000115005.702.680.587.753.254.501.102.600.296.5003.2505.8750.69SAE 477.01.8 in (29.5 mm)
RCH-200325-1502.000+0.000/-0.0033.251500160005.702.680.587.753.254.501.102.600.296.5003.2505.8750.69SAE 477.01.8 in (29.5 mm)
RCH-200500-0752.000+0.000/-0.0035.0075082006.102.750.5011.253.504.381.232.200.346.5004.9508.1870.94SAE 4150.02.4 in (39 mm)
RCH-200500-1002.000+0.000/-0.0035.001000120006.102.750.5011.253.504.381.232.200.346.5004.9508.1870.94SAE 4150.02.4 in (39 mm)
RCH-200500-1502.000+0.000/-0.0035.001500170006.102.750.5011.253.504.381.232.200.346.5004.9508.1870.94SAE 4150.02.4 in (39 mm)
RCH-250400-0752.500+0.000/-0.0034.0075060006.103.140.567.683.504.771.233.00.357.090.913.8136.3750.69SAE 4102.02.4 in (39 mm)
RCH-250400-1002.500+0.000/-0.0034.00100080006.103.140.567.683.504.771.233.00.357.090.913.8136.3750.69SAE 4102.02.4 in (39 mm)
RCH-250400-1502.500+0.000/-0.0034.001500150006.103.140.567.683.504.771.233.00.357.090.913.8136.3750.69SAE 4102.02.4 in (39 mm)
RCH-250600-0752.500+0.000/-0.0036.00750300008.853.250.7512.755.003.631.133.000.389.0005.7309.4371.06SAE 8290.07.9 in (129 mm)
RCH-250600-1002.500+0.000/-0.0036.001000360008.853.250.7512.755.003.631.133.000.389.0005.7309.4371.06SAE 8290.07.9 in (129 mm)
RCH-250600-1502.500+0.000/-0.0036.001500500008.853.250.7512.755.003.631.133.000.389.0005.7309.4371.06SAE 8290.07.9 in (129 mm)
RCH-300600-0753.000+0.000/-0.0036.0075017000-3.880.3812.755.004.881.103.11-9.0005.7309.4371.06SAE 8219.05.5 in (90 mm)
RCH-300600-1003.000+0.000/-0.0036.00100022500-3.880.3812.755.004.881.103.11-9.0005.7309.4371.06SAE 8219.05.5 in (90 mm)
RCH-300700-0753.000+0.000/-0.0037.0075030000-3.880.3814.756.507.331.384.73-10.0006.58010.6251.19SAE 8401.08.8 in (145 mm)
RCH-300700-1003.000+0.000/-0.0037.00100036000-3.880.7514.756.507.331.384.73-10.0006.58010.6251.19SAE 8401.08.8 in (145 mm)
RCH-300700-1503.000+0.000/-0.0037.00150050000-3.880.7514.756.507.331.384.73-10.0006.58010.6251.19SAE 8401.08.8 in (145 mm)
RCH-350800-0753.500+0.000/-0.0038.0075040000-3.880.7516.147.008.931.325.35-11.5007.50011.8121.31SAE 10550.011.0 in (181 mm)
RCH-350800-1003.500+0.000/-0.0038.00100055000-4.380.9016.147.008.931.325.35-11.5007.50011.8121.31SAE 10550.011.0 in (181 mm)
RCH-350800-1503.500+0.000/-0.0038.00150080000-4.380.9016.147.008.931.325.35-11.5007.50011.8121.31SAE 10550.011.0 in (181 mm)
RCH-400800-0754.000+0.000/-0.0058.0075040000-4.380.9016.147.008.881.375.35-11.5007.50011.8121.31SAE 10541.014.0 in (230 mm)
RCH-400800-1004.000+0.000/-0.0058.00100055000-4.880.9016.147.008.881.375.35-11.5007.50011.8121.31SAE 10541.014.0 in (230 mm)
RCH-400800-1504.000+0.000/-0.0058.00150080000-4.880.9016.147.008.881.375.35-11.5007.50011.8121.31SAE 10541.014.0 in (230 mm)
RCH-5001000-10005.000+0.000/-0.00510.00100075000-5.750.9021.659.3812.442.157.85-16.3909.62015.8801.81SAE 101185.027.0 in (442 mm)
RCH-5001000-15005.000+0.000/-0.00510.001500103000-5.750.9021.659.3812.442.157.85-16.3909.62015.8801.81SAE 101185.027.0 in (442 mm)
RCH-5001000-7505.000+0.000/-0.00510.0075050000-4.880.9021.659.3812.442.157.85-16.3909.62015.8801.81SAE 101185.027.0 in (442 mm)
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