Learn how to identify and reduce ergonomic risk in fastening applications with the Mountz REBA-Informed Ergonomic Risk Scale. This quick reference guide helps manufacturers evaluate posture, repetition, and torque reaction in manual and powered assembly tasks while providing practical recommendations to improve operator safety and efficiency. It also highlights how torque arm solutions—including articulated, linear, telescoping, and position-control arms—can reduce strain, stabilize torque reaction, and support proper working posture in assembly environments.
REBA-Informed Ergonomic Risk Scale for Fastening Applications This scale provides a simplified, REBA-informed view of ergonomic risk commonly observed in manual and powered fastening tasks. It is intended for education and awareness only and does not replace a
Risk Level 2–3: Low Risk Typical Conditions Mostly neutral posture with minor deviation Moderate repetition or light force Common Scenarios Seated or standing assembly with limited reach Recommended Action Minor ergonomic improvements as needed Torque Arm Guidance Torque arms optional Consider linear or articulated arms to reduce fatigue and cumulative strain Risk Level 4–7: Medium Risk Typical Conditions Noticeable posture deviation Repetitive cycles or increased torque reaction Common Scenarios Angled fastening or reaching outside the neutral work zone Recommended Action Ergonomic intervention recommended Torque Arm Guidance Torque arms should be evaluated Linear arms for straight-line travel Articulated arms for angled or constrained access formal ergonomic assessment. Risk Level 1: Negligible Risk Typical Conditions Neutral posture, minimal force or torque reaction Low repetition, short cycle times Common Scenarios Bench-height, light-duty fastening within easy reach Recommended Action No immediate changes required Continue monitoring Torque Arm Guidance Torque arms typically not required May be used for standardization or comfort Important Note This scale reflects common ergonomic risk categories informed by REBA principles. Risk levels are illustrative, not official REBA scores, and are intended to support ergonomic awareness and improvement discussions.
Risk Level 8–10: High Risk Typical Conditions Sustained non-neutral posture Elevated arms, overhead work, or high torque reaction Common Scenarios Overhead or high-torque fastening without reaction control Recommended Action Ergonomic redesign strongly recommended Torque Arm Guidance Torque arms typically appropriate Articulated or telescoping arms help control torque and support posture Risk Level 8–10: High Risk Typical Conditions Sustained non-neutral posture Elevated arms, overhead work, or high torque reaction Common Scenarios Overhead or high-torque fastening without reaction control Recommended Action Ergonomic redesign strongly recommended Torque Arm Guidance Torque arms typically appropriate Articulated or telescoping arms help control torque and support posture Risk Level 11–15: Very High Risk Typical Conditions Severe posture deviation High force, repetition, and limited recovery Common Scenarios Unsupported high-torque fastening in awkward access areas Recommended Action Immediate redesign required Formal ergonomic assessment recommended Torque Arm Guidance Torque arms required as part of task redesign High-capacity or position-controlled systems may be appropriate
SILICON VALLEY HEADQUARTERS 1080 North 11th Street, San Jose, CA 95112 | Phone: (408) 292-2214 | Fax: (408) 292-2733 | mountztorque.com
Prevent Ergonomic Risks with Mountz Torque Arms
ATS-Series Articulated Torque Arms
Reduces shoulder reach and elevation Minimizes wrist bending during angled fastening Supports tool weight to lower arm strain Reduces trunk rotation Stabilizes torque reaction
REBA Impact: Lower upper limb and trunk risk scores.
LTS-Series Linear Torque Arms Maintains neutral shoulder posture Reduces static tool holding Limits repetitive reaching Keeps consistent working height Controls reaction torque
REBA Impact: Lower neck, shoulder, and load scores.
CTA-Series Telescoping Carbon Torque Arm
Prevents overextension Reduces wrist deviation Lightweight design lowers operator effort
Improves tool alignment Reduces muscle fatigue
REBA Impact: Lower upper arm and force/load scores.
EZ-Glider Position Control Torque Arms
Reduces sustained awkward postures Keeps work within optimal reach zone Minimizes force spikes Reduces shoulder and back strain Improves positioning control
REBA Impact: Lower overall posture and activity risk levels.
SILICON VALLEY HEADQUARTERS 1080 North 11th Street, San Jose, CA 95112 | Phone: (408) 292-2214 | Fax: (408) 292-2733 | mountztorque.com
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