DITRON 617 vs 618 Inside Groove Digital Calipers | Knife-Edged Measuring Faces Malaysia
Choosing a Digital Caliper for Narrow Internal Grooves
The DITRON 617 and 618 Series Inside Groove Digital Calipers use knife-edged measuring faces to access recessed internal features.
The 617 Series has overlapping jaws for narrow inside groove measurements. The 618 Series provides a double inside groove jaw arrangement, with measuring contacts above and below the beam.
For machining workshops and inspection teams in Malaysia, selection should consider the groove location, entrance clearance, contact reach and required accuracy.
617 SERIES: OVERLAPPING INSIDE GROOVE JAWS
The DITRON 617 Series is designed to reach suitable internal grooves through restricted openings.
Four configurations are listed. Their measuring ranges and jaw dimensions differ substantially, so the model with the largest range is not automatically the best choice for a small opening.
617 SERIES MODEL SPECIFICATIONS
All dimensions and accuracy values below are in millimetres. L and a-e refer to the manufacturer’s dimensional drawing.
Model: 617-5-150
Measuring range: 5-150mm
Accuracy: ±0.04mm
L: 240mm
a: 25mm
b: 4.5mm
c: 1mm
d: 16mm
e: 2mm
Model: 617-19-150
Measuring range: 19-150mm
Accuracy: ±0.06mm
L: 240mm
a: 60mm
b: 17mm
c: 1.5mm
d: 16mm
e: 6mm
Model: 617-22-200
Measuring range: 22-200mm
Accuracy: ±0.06mm
L: 290mm
a: 70mm
b: 20mm
c: 1.5mm
d: 16mm
e: 7mm
Model: 617-26-300
Measuring range: 26-300mm
Accuracy: ±0.07mm
L: 400mm
a: 80mm
b: 24mm
c: 1.5mm
d: 16mm
e: 8mm
Display resolution is not specified in the supplied 617 Series table. Confirm it before ordering.
618 SERIES: DOUBLE INSIDE GROOVE JAWS
The DITRON 618 Series has two internal groove measuring arrangements, positioned above and below the beam.
The catalogue identifies inside groove measurement in small holes as its application. The two contact arrangements provide different access options, but suitability depends on the actual component geometry.
The supplied table does not provide all dimensions of each jaw arrangement. Confirm the relevant drawing before selecting the instrument for a restricted opening.
618 SERIES MODEL SPECIFICATIONS
Model: 618-18-150
Measuring range: 18-150mm
Resolution: 0.01mm
Accuracy: ±0.05mm
L: 270mm
d: 16mm
Model: 618-18-200
Measuring range: 18-200mm
Resolution: 0.01mm
Accuracy: ±0.06mm
L: 320mm
d: 16mm
Model: 618-18-300
Measuring range: 18-300mm
Resolution: 0.01mm
Accuracy: ±0.06mm
L: 425mm
d: 16mm
These specifications reproduce the supplied DITRON catalogue tables.
617 VS 618: THE MAIN DIFFERENCES
Jaw Arrangement
The 617 Series uses overlapping long jaws. The 618 Series provides upper and lower inside groove contacts.
Minimum Measuring Range
The 617 models start at 5mm, 19mm, 22mm or 26mm, depending on configuration. All listed 618 models start at 18mm.
These are measuring span limits. They should not be treated as a complete statement of the minimum bore entrance required for insertion.
Jaw Reach
The 617 table provides a dimensions from 25mm to 80mm. Actual usable depth depends on the jaw profile, insertion path and surrounding features.
Resolution
The 618 Series explicitly lists 0.01mm resolution. The supplied page does not state the 617 Series resolution.
Accuracy
The 617 models are listed at ±0.04mm to ±0.07mm. The 618 models are listed at ±0.05mm or ±0.06mm.
KEY FUNCTIONS
Zero-Setting at Any Position
Both series allow zero-setting at a selected position for comparative measurements and reference changes.
Zero-setting changes the displayed reference. It does not change the physical limits of the measuring jaws.
Millimetre/Inch Conversion
Both series list unit conversion at any position.
Digital Display
The numerical display allows direct reading without interpreting a mechanical vernier scale.
The catalogue’s wording about relative and absolute measurement conversion does not establish that the instruments use an absolute position encoder.
HOW TO CHECK GROOVE COMPATIBILITY
Identify the Required Dimension
Confirm whether the drawing requires an internal groove diameter, width or another groove-related dimension.
The correct measuring faces must contact the surfaces that define that dimension.
Check the Entrance and Insertion Path
Provide the bore entrance diameter, groove position, shoulder details and access clearance.
The contacts must pass through the entrance and reach the intended groove without interference.
Check Contact Thickness and Profile
The 617 table lists c dimensions of 1mm or 1.5mm. Do not interpret this dimension alone as a guaranteed minimum groove width.
Clearance, contact projection and groove radii also affect seating.
Check the Required Tolerance
For the 618 Series, 0.01mm resolution describes the display increment. It does not mean ±0.01mm accuracy.
Consider listed accuracy together with alignment, reference quality and repeatability.
TYPICAL APPLICATIONS
Internal Groove Inspection
Check suitable recessed grooves in machined sleeves, bores and housings.
Restricted Access Measurements
Use the appropriate overlapping or double-jaw configuration where conventional inside jaws cannot reach the target.
Machining Setup Checks
Inspect accessible internal features during machining, subject to the required tolerance and contact arrangement.
Maintenance and Replacement Parts
Compare internal groove dimensions with drawings or replacement components.
These applications are relevant to engineering teams in Selangor, Penang, Johor and other industrial areas in Malaysia.
BASIC MEASUREMENT WORKFLOW
1. Clean the groove and contacts.
Remove chips and residue. Check for burrs that could prevent correct seating.
2. Inspect the caliper.
Check the measuring faces, sliding movement and display operation.
3. Establish the reference.
Follow the manufacturer’s procedure and verify against a suitable internal reference.
4. Insert the jaws carefully.
Protect the thin contacts from striking the bore entrance or shoulders.
5. Seat and align the measuring faces.
Ensure both contacts reach the intended surfaces. Apply gentle contact without forcing the jaws into position.
6. Repeat the measurement.
Withdraw and reposition the instrument to assess consistency before recording the result.
CARE AND ROUTINE CHECKING
Protect the knife-edged contacts from impact, bending and excessive force. They are measuring surfaces and should not be used for cutting or scraping.
If readings vary, check contact seating, contamination, alignment and reference setting first. Persistent disagreement with a suitable reference warrants further inspection or calibration.
Battery type, environmental protection rating and package contents are not specified on the supplied page. Confirm these details where required.
FREQUENTLY ASKED QUESTIONS
What is the difference between 617 and 618?
The 617 Series uses overlapping inside groove jaws. The 618 Series provides upper and lower inside groove measuring arrangements.
Which model has the smallest listed minimum range?
The 617-5-150 has a listed range of 5-150mm. Confirm physical access separately.
What is the 618 Series resolution?
The catalogue lists 0.01mm.
What is the 617 Series resolution?
It is not stated in the supplied table and requires confirmation.
Can these calipers measure every groove within their range?
No. Entrance clearance, jaw reach, contact profile and groove geometry must also be suitable.
Do they support inches?
Yes. Millimetre/inch conversion is listed for both series.
What information helps with selection?
Provide a component drawing showing the bore entrance, groove diameter, width, depth, position and inspection tolerance.
SEO META DESCRIPTION
Compare DITRON 617 and 618 inside groove digital calipers in Malaysia. Explore knife-edged contacts, overlapping jaws, measuring ranges and accuracy.
CONTACT MTM PRECISION
Contact MTM Precision with your internal groove drawing, access dimensions and inspection tolerance for assistance selecting a DITRON 617 or 618 Inside Groove Digital Caliper.
MTM Precision Sdn Bhd
Showroom & Service Centre: No. 29-1 & 29-2, Jalan Bandar 18, Pusat Bandar Puchong, 47160 Puchong, Selangor, Malaysia
Tel: 03-8080 7172
WhatsApp: +6016-660 7346
Email: mtmpre@yahoo.com
Website: www.mtmpre.com.my
25 Oct 2026
