DITRON 628 Hook Type & 629 Internal Distance Digital Calipers | Groove Measurement Malaysia
DITRON 628 and 629 Specialised Digital Calipers
The DITRON 628 and 629 series use specialised contact arrangements for measuring groove features and internal distances where conventional caliper jaws may not provide suitable access.
The 628 series is a hook-type digital caliper for measuring internal groove widths in deep bores. The 629 series is an internal distance digital caliper, with the catalogue describing groove measurement inside and outside holes.
Both series feature zero-setting at any position and millimetre/inch conversion.
PRODUCT HIGHLIGHTS
• 628 series: hook-type arrangement for internal groove width measurement.
• 629 series: specialised internal distance measuring arrangement.
• Digital readout.
• Zero-setting at any position.
• Relative measurement using a selected reference.
• Millimetre/inch conversion at any position.
• Multiple measuring ranges and contact dimensions.
628 SERIES — HOOK TYPE DIGITAL CALIPERS FOR INNER GROOVES
The DITRON 628 series is designed for measuring internal groove widths in accessible deep bores.
Its hook-type measuring arrangement reaches groove faces that may be inaccessible to ordinary caliper jaws. Suitability depends on the bore entrance, groove location, contact clearance and required measuring direction.
Available models:
DITRON 628-125
Listed measuring range: 0–125mm
Catalogue-stated accuracy: ±0.03mm
Dimension L: 231mm
Dimension a: 4mm
Dimension b: 24mm
Dimension c: 3mm
Dimension d: 14.5mm
Dimension e: 12mm
DITRON 628-150
Listed measuring range: 0–150mm
Catalogue-stated accuracy: ±0.03mm
Dimension L: 255mm
Dimension a: 4mm
Dimension b: 24mm
Dimension c: 3mm
Dimension d: 14.5mm
Dimension e: 12mm
DITRON 628-200
Listed measuring range: 0–200mm
Catalogue-stated accuracy: ±0.04mm
Dimension L: 305mm
Dimension a: 4mm
Dimension b: 24mm
Dimension c: 3mm
Dimension d: 14.5mm
Dimension e: 12mm
DITRON 628-300
Listed measuring range: 0–300mm
Catalogue-stated accuracy: ±0.04mm
Dimension L: 466mm
Dimension a: 5mm
Dimension b: 86mm
Dimension c: 4mm
Dimension d: 15mm
Dimension e: 14mm
All dimensions follow the manufacturer’s drawing and are in millimetres.
629 SERIES — INTERNAL DISTANCE DIGITAL CALIPERS
The DITRON 629 series features projecting measuring contacts for checking suitable internal distances and groove features.
The catalogue describes use for grooves inside and outside holes. Confirm the exact contact arrangement against your component drawing before selecting the instrument.
Available models:
DITRON 629-150
Listed measuring range: 0–150mm
Catalogue-stated accuracy: ±0.03mm
Dimension L: 260mm
Dimension a: 8mm
Dimension b: 24mm
Dimension c: 3mm
Dimension d: 16mm
DITRON 629-200
Listed measuring range: 0–200mm
Catalogue-stated accuracy: ±0.04mm
Dimension L: 325mm
Dimension a: 8mm
Dimension b: 50mm
Dimension c: 3mm
Dimension d: 16mm
DITRON 629-300
Listed measuring range: 0–300mm
Catalogue-stated accuracy: ±0.04mm
Dimension L: 455mm
Dimension a: 9mm
Dimension b: 80mm
Dimension c: 4mm
Dimension d: 16mm
The supplied page does not explicitly specify display resolution for either series. Confirm this separately if required by your purchasing specification.
628 VS 629 — WHICH SHOULD YOU CHOOSE?
Choose the 628 series when the task requires internal groove width measurement and the hook-type arrangement can contact the required groove faces.
Choose the 629 series when its internal distance contact arrangement matches the dimension being inspected.
These instruments should be selected by measuring geometry rather than maximum range alone. Provide a cross-sectional drawing showing the required dimension whenever possible.
MEASURING RANGE DOES NOT DEFINE ACCESS
The catalogue lists ranges beginning at zero, but this does not establish a zero minimum accessible groove width or bore size.
Physical access depends on:
• Bore entrance dimensions.
• Groove width and depth.
• Distance from the entrance to the groove.
• Contact thickness and projection.
• Internal shoulders or obstructions.
• Clearance for inserting and withdrawing the instrument.
For example, the 628-300 has a listed dimension b of 86mm. This drawing dimension should not automatically be treated as a guaranteed usable insertion depth.
CHECK THE REQUIRED GROOVE DIMENSION
Groove width, groove diameter, groove depth and distance from a reference face are different dimensions.
The 628 is specifically described for internal groove width measurement. For the 629, confirm how its contacts engage the intended feature and which reading procedure applies.
A suitable contact arrangement must touch the specified measuring surfaces without resting on radiused corners, burrs or adjacent shoulders.
ZERO-SETTING AND REFERENCE HANDLING
Both series list zero-setting at any position.
This supports comparative measurements from a selected reference. Follow the manufacturer’s instructions for establishing the reference and checking whether any contact allowance or preset value is required.
The catalogue’s wording about relative and absolute measurement conversion does not explicitly establish a coded absolute encoder or reference retention after power loss.
MILLIMETRE AND INCH CONVERSION
Both series support millimetre/inch conversion at any position.
Changing the displayed unit does not change measurement accuracy. Record the selected unit and reference setting consistently during inspection.
APPLICATIONS IN MALAYSIA
The DITRON 628 and 629 series can be considered for:
• Internal groove inspection in machined housings.
• Accessible retaining-ring groove checks.
• Internal spacing measurements.
• Recessed feature inspection.
• Maintenance and replacement-part comparison.
• Incoming inspection of specialised machined components.
For engineering workshops and inspection teams in Selangor, Kuala Lumpur, Johor and Penang, suitability should be assessed against the actual component geometry and tolerance.
For tight-tolerance or complex groove inspection, another measuring method may be more appropriate.
ACCURACY AND MEASUREMENT CONDITIONS
Catalogue-stated accuracy:
629-150: ±0.03mm
Results also depend on alignment, reference setting, contact force, cleanliness and instrument condition.
Do not infer display resolution from the product photograph or transfer specifications from another DITRON series.
BASIC MEASURING PROCEDURE
1. Identify the required dimension on the component drawing.
2. Check that the contacts can enter and withdraw safely.
3. Clean the measuring contacts and workpiece.
4. Establish the reference according to the operating instructions.
5. Position the contacts against the intended measuring surfaces.
6. Check for interference from shoulders, edges and radiused corners.
7. Apply light, consistent contact force.
8. Read and record the measurement.
9. Repeat to assess consistency.
10. Withdraw the instrument carefully without catching the contacts.
Do not force the hook or measuring contacts through a restricted opening.
CARE AND BASIC CHECKS
• Protect projecting contacts from bending and impact.
• Keep the beam and sliding surfaces clean.
• Remove chips and residue before measurement.
• Avoid excessive contact force.
• Do not measure hot or moving components.
• Follow the supplied battery and cleaning instructions.
• Store with the measuring contacts protected.
• Check performance against suitable reference standards according to your quality procedure.
The supplied page does not explicitly specify an IP rating, battery type, rechargeable operation, Bluetooth capability or material grade.
FREQUENTLY ASKED QUESTIONS
What is the DITRON 628 designed for?
The catalogue describes it as a hook-type digital caliper for measuring internal groove widths in deep bores.
What is the DITRON 629 designed for?
It is described as an internal distance digital caliper, with applications involving grooves inside and outside holes.
What ranges are listed for the 628?
The catalogue lists 125mm, 150mm, 200mm and 300mm models.
What ranges are listed for the 629?
The catalogue lists 150mm, 200mm and 300mm models.
Does the listed range establish the smallest groove it can measure?
No. Minimum accessible feature size depends on the contact geometry and available clearance.
Can the 628 measure groove diameter?
The page specifically identifies groove width measurement. Do not assume groove diameter capability without confirming the measuring arrangement.
What is the display resolution?
The supplied page does not explicitly state resolution for either series.
Can both series be zeroed at a reference?
Yes. Zero-setting at any position is listed.
Are these rechargeable instruments?
Rechargeable operation and Type-C charging are not specified on this page.
Is a calibration certificate included?
The supplied page does not confirm that an individual calibration certificate is included. Specify documentation requirements when requesting a quotation.
SEO META DESCRIPTION
Compare DITRON 628 hook-type and 629 internal distance digital calipers in Malaysia for internal groove and specialised distance measurement.
ENQUIRE ABOUT DITRON GROOVE MEASURING CALIPERS
Contact MTM Precision with your required model, quantity and component drawing. Include the bore entrance, groove dimensions, measuring location and tolerance so contact access can be assessed.
Please specify any resolution, reference-setting or calibration documentation requirements. Availability, final configuration and supplied accessories are subject to confirmation.
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
24 Oct 2026
