What Information Is Required to Quote Replacement Robot Gripper Fingers?
A useful replacement robot gripper fingers quote starts with the mounting interface, workpiece contact, required final condition, and available design evidence—not a long list of assumptions. This guide separates what is enough to begin a review from what is needed for a reliable manufacturing quotation and what may be required before production or application validation.
Three information levels—not one entry barrier
You do not need a complete engineering package simply to ask whether a replacement finger or jaw is feasible. The information requirement becomes more specific as a project moves toward manufacture.
Identify the gripper, replacement purpose, available drawing or sample, and approximate first-order need. Gaps can be identified during this review.
Define the mounting interface, critical final-state dimensions, material and processing condition, quantity, and acceptance or reporting requirements that affect manufacturing scope.
Resolve the approved drawing and application-dependent inputs needed to validate fit, contact, interchangeability, gripping behavior, and machine safety before production or use.
For broader non-gripper replacement parts, use the general discontinued MRO part RFQ guide. The sections below focus on gripper fingers, jaws, and related EOAT replacement parts.
1. Identify the finger and replacement purpose
Start with the gripper brand and model, the existing finger or jaw part number if known, and the robot or application where it is installed. Explain whether the request concerns:
- an obsolete or difficult-to-source finger;
- a damaged or worn finger;
- a repeat spare for installed equipment; or
- a new finger geometry for a workpiece changeover.
Also state the replacement purpose in plain language. Identification tells the reviewer whether the task is intended as interchangeability with an existing part, dimensional reproduction, or a new application that requires separate engineering validation.
2. Show the available technical references
Any of the following can start an initial review; their usefulness is not identical:
Design evidence
- 2D drawing with dimensions and notes
- 3D CAD model
- Physical sample
- Customer- or integrator-approved final drawing, if available
Interface evidence
- Assembly and mounting photographs
- Matching finger, insert, pad, or mating part
- Workpiece drawing, model, or contact-area information
- Installed orientation and accessible mounting details
A photograph may help identify the part and assess the next step, but it does not by itself define hidden geometry, datums, material condition, final-state tolerances, or application safety requirements.
3. Define the mounting interface, datums, and final-state dimensions
Custom gripper fingers must be located relative to the gripper and the workpiece. Mark the finger datum references and identify dimensions that control:
- mounting-hole pattern, counterbores, threads, locating pins, and slots;
- finger height, offset, stroke clearance, and paired-finger relationship;
- contact geometry and the workpiece interface;
- insert or pad location and retention; and
- interchangeability with existing fingers or future repeat batches.
Do not label every dimension “critical.” Instead, identify the dimensions that control mounting, alignment, contact, or interchangeability and give the applicable tolerance only where it is known and approved.
For each critical requirement, state the required final condition: after machining, after heat treatment, or after surface treatment. The same applies to surface finish requirements. This prevents a machining-stage dimension from being mistaken for an acceptance requirement after all processing is complete.
4. Specify material and processing condition
Where known, provide the material grade and supply condition, heat treatment and hardness requirement, and surface treatment or coating. Identify any separate contact pads or inserts and how they are attached or replaced.
Wear, corrosion, and impact conditions should be described as application inputs rather than converted into an assumed material choice. If the existing material or condition is unknown, say so; a sample can be reviewed, but its original specification should not be inferred without evidence.
5. Separate application inputs from quotation inputs
Some gripper-specific information can affect geometry or manufacturing scope. Other information is principally required for the customer’s or integrator’s application validation. Depending on the application, relevant inputs may include:
- part weight;
- gripper model and stroke;
- grip direction and workpiece orientation;
- workpiece contact surface, material, and geometry;
- robot acceleration and deceleration;
- required safety factor defined by the responsible customer or integrator;
- power-loss retention requirement; and
- existing failure mode, such as wear, slip, deformation, collision damage, or insert loss.
These are not universal numerical requirements, and this article does not prescribe values. At inquiry stage, provide what is known and identify what still requires application review. Before production or use, the responsible customer or system integrator must validate the complete gripping application against the gripper and robot manufacturer’s limits.
6. Define quantity, repeat supply, and required records
State the first-article quantity, initial batch quantity, and expected repeat quantity or frequency separately. If future batches must remain interchangeable with installed fingers, identify the controlled drawing revision, datums, final-state critical dimensions, and acceptance requirements that must remain consistent.
Also state whether the project requires an inspection report, dimensional report, or material certificate. These are requested deliverables that affect quotation scope; listing them here is not a promise that a particular document is available for every material, process, or supplier route.
7. What can be quoted from a drawing versus a sample?
| Available route | What it can support | What must still be agreed |
|---|---|---|
| Drawing-to-part | Review against defined geometry, material, final condition, quantity, and acceptance notes. | Drawing approval, ambiguous notes, manufacturing scope, and any application-dependent validation inputs. |
| Sample-to-part | Initial feasibility and dimensional reconstruction of accessible features. | Wear compensation, hidden geometry, original datums, material condition, tolerances, design intent, and approved acceptance criteria. |
| Sample + application data | Review the sample in context of mounting, stroke, contact geometry, workpiece, and observed failure mode. | A mutually agreed dimensional definition or approved drawing, plus responsibility for application and safety validation. |
When no approved drawing exists, dimensional reproduction can define an agreed replacement geometry, but it does not automatically transfer or recreate the original designer’s load calculations, safety factor, gripping-force assumptions, or machine-safety validation.
Replacement finger RFQ checklist
Use this checklist to organize the information already available. Missing items do not prevent an initial inquiry; they identify questions to resolve before quotation, production, or application validation.
Initial feasibility
- Drawing / sample availability
- Replacement purpose
- Equipment or gripper model
- Existing part number, robot, and application
- First-order quantity
- Photographs of the finger, mounting, and workpiece
Reliable quotation scope
- Expected repeat quantity / frequency
- Final-state critical dimensions and tolerances
- Material condition, surface treatment, and heat treatment
- First article approval requirement
- Inspection report requirement
- Future-batch interchangeability requirement
Gripper interface details
- Part weight
- Gripper model and stroke
- Grip direction
- Contact surface / material
- Existing failure mode
- Customer- or integrator-approved drawing status
Application validation, when applicable
- Robot acceleration / deceleration
- Customer- or integrator-defined safety factor
- Power-loss retention requirement
- Payload and gripping-force validation inputs
- Interference, collision, and machine-safety review
Have a drawing, physical sample or worn finger? Continue to the specialist solution page for an initial gripper-finger review; missing manufacturing inputs can be identified during that review.
Submit Your Gripper Finger for Review →Frequently asked questions
Can replacement robot gripper fingers be quoted from a physical sample only?
A sample may support an initial feasibility review and dimensional reconstruction, but it may not reveal the original design intent, material condition, final-state tolerances, load assumptions, or approved safety criteria. These items must be agreed separately where they affect manufacture or application validation.
Is a complete engineering package required to submit an inquiry?
No. Basic identification, the replacement purpose, available drawings or sample photographs, and an initial quantity are enough to begin a feasibility review. Additional manufacturing and application information can be identified during review.
Which tolerances should appear in a replacement-finger RFQ?
Identify the dimensions that control mounting, datum location, workpiece contact, interchangeability, threads, pins, and slots. State whether each tolerance applies after machining, heat treatment, or surface treatment so the required final condition is clear.
Who validates gripping force and machine safety?
MUXI manufactures replacement components to customer-approved drawings or mutually agreed dimensional requirements. Final validation of gripping force, payload, safety factor, power-loss behavior and overall machine safety remains the responsibility of the customer or system integrator.
Related technical resources
- Replacement Robot Gripper Fingers for Installed Equipment — Commercial review path for drawing- or sample-based replacement requirements
- Robot Gripper Finger Replacement: Engineering Guide
- Schunk PGN-plus Replacement Finger: Interface and Application Notes
- How to Replace Discontinued Robot Gripper Fingers
- What Information Is Needed to Quote a Discontinued MRO Part?