Rocker Arm

Rocker arm is an oscillating lever in an engine. It’s one end is raised which is lowered by a rotating lobe of the camshaft while the other end serves to work on a valve stem. We take care of the wear resistance with chilled cast iron along with heat treatment and attain just the perfect surface roughness by controlling metal cutting parameters. In crux this is the way we manufacture rocker arms.


  • Perfect hardness
  • Heat treated
  • Trouble-free performance
  • Bearing made in Taiwan included


  • Raw material used 20CrMo
  • Hardness between HRC 60-62
  • Carburizing depth of heat treatment 0.8 – 1.2m
  • Surface roughness ≤ 0.2 RA
  • Rocker arm ratio between 1.5: 1.0 to 1.8: 1.0

Raw Material

Our product is made from carbon steels by forging and casting process. Correct hardness and heat treatment cycle with accurately machined parameters ensures trouble-free performance of the product which is ensured by us. Rocker shafts of various types are made from alloy steels. Below is a comparison on how we select raw materials for the product.

Parameter Details At RITSUKA Chinese Product RITSUKA Advantage
BOP (Bought Out Parts) Bearing BOP BOP We provide bearings from Taiwan maintaining OEM standards
Raw Material Body 20CrMo Steel grade Raw Material Substandard Steel Grade Raw Material High Strength & High Yield, High Temperature resistant
Bearing Taiwan Quality Bearing Chinese Bearing Our product offers exceptional mechanical properties like durability, comfort and longevity along with safe ride.


With backward integration, we are capable of manufacturing rocker arm right from design and development stage to manufacture and supply the finished machined product all under one roof and supply to various customers all over the globe. Our comprehensive PPAP capabilities lend us our edge. Our state-of-the-art full gage room comes with dedicated CMM fixtures, air guages, dial bores, electronic bore gauges, etc. Each job has its own gauge box for quick and organized job launches. We also utilize gauge track as our gauge calibration tracking system. These excellent resources and thorough manufacturing result in superior rocker arm.

Parameter Details RITSUKA Chinese Product RITSUKA Advantage
Manufacturing Machining CNC machining centre CNC machining centre Machines By using fully automated CNC machines, we offer min. Tolerance level products with negligible rejection at final stage.
Design centre, Tool room and R&D facilities In-house Design centre, tool room and R&D centre Not available with normal chinese factories We have an extra ordinary aptitude in developing customized formulations for steel products. For moulded products, we have in-house tool room with integrated facilities for mould design and mould manufacturing enabling quick lead time to customers
Moulding Automated moulding process Manual Moulding process Automated moulding results in Relatively poor wear under heavy duty conditions and at higher friction levels
Heat Treatment Inhouse Heat treatment process Outsourced in most of the factories Grain alignment to give better raw material strength and to reduce internal stress

Rocker arms manufactured by us is available in one type of finish:

Original Steel

Finishing is an imperative stage of the entire manufacturing process as this controls exhaust scavenging potential, in taking air command and translating camshaft movement into valve actuation.


Parameter Details At RITSUKA Chinese Product RITSUKA Advantage
Testing Standards Incoming Parts 100% Inspection & Testing Random / No Testing Committed to offer same quality / specifications product with every lot
In process

Inhouse facility includes

  1. Material composition test
  2. Random Dimensional check with Three axis coordinate measuring machine
  3. Hardness Test
  4. Rocker Arm Ratio
  5. Surface Roughness test
  1. Visual testing
  2. On demand testing from external agencies
  1. Controlled Standard Parameters at every Process
  2. Three axis coordinate measuring machine
  3. Hardness Test – With the intention to make the metal the hardest, our HRC is 60-62. Longer carburizing times and higher
  4. Surface Roughness Test – Ours is exceptional =0.2 RA. 5. Rocker Arm Ratio – Our lies between 1.8: 1.0.
Final Inspection Fitment check using pneumatic gauge, Hydraulic / Electronic Universal testing machines Manual inspection Ensures safe operation and adequate durability We have both Electronic and Hydraulic universal testing machine (UTM) for testing the tensile strength and compressive strength of materials used in manufacturing
S/N Test Equipment Name
1 Friction material test machine
2 Compression testing machine
3 Precise surveying instrument
4 Electronic universal testing machine
5 Three-coordinates measuring machine
6 Constant speed friction tester
7 Precision salt spray test machine
8 Rockwell hardometer
9 Electronic balance
10 Digital spring tension test
11 Hydraulic universal testing machine
12 Rockwell hardometer
13 Feeler gauge
14 Infrared thermometer
15 Dial caliper

Dimensional Test Report

S.No. Inspection Item Inspection Item Technical Requirement Test Result
1 2 3 4 5
1 large Aperture Special Sleeve Plug 10+0.015 10.015 10.013 10.012 10.013 10.014
2 Total length Micrometer calipers 20.7-0.1~20.7-0.25 20.52 20.55 20.52 20.5 20.54
3 Distance between screw hole to end aperture Height gages 14.5+0.15 14.52 14.58 14.5 14.5 14.56
4 Distance between screw hole to end aperture Special inspection tools 25.2+0.15 25.24 25.26 25.28 25.22 25.24
5 Parallelism of bearing and large aperture Special inspection tools 0.02 0.01 0.012 0.015 0.016 0.012
6 Precision of thread Thread plug gage M6*0.75-6H Passed Passed Passed Passed Passed
7 Distance between surface of screw to large aperture Special inspection tools 8+0.2 Passed Passed Passed Passed Passed
8 Hardness of screw head Rockwell hardometer 62-67HRC 64 62 64 63 64
9 Hardness of screw head Rockwell hardometer 20-30HRC 26 27 28 29 27
10 Hardness of surface Rockwell hardometer 78-83HRC 80 80 81 82 80
11 Hardness of core Rockwell hardometer 25-45HRC 44 44 44 44 44
12 Depth of harden layer Metalloscope 0.3-0.5 0.4 0.4 0.4 0.4 0.4
13 Flexibility ratio of screw By touch feeling Smooth Passed Passed Passed Passed Passed
14 Exteriror By eye-measurement No burrs, no rifts Passed Passed Passed Passed Passed

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