DITRON 628 & 629 Digital Groove Calipers | Internal Groove Width & Distance Measurement Malaysia
DITRON 628 and 629 Digital Groove Measuring Calipers
The DITRON 628 and 629 series feature specialised measuring contacts for groove and internal distance checks where standard caliper jaws may not reach.
The 628 series uses a hook-type arrangement for measuring internal groove widths in deep bores. The 629 series uses an internal distance measuring arrangement, with the catalogue describing applications involving grooves inside and outside holes.
Both series provide digital readout, zero-setting at any position and millimetre/inch conversion.
DITRON 628 — HOOK TYPE DIGITAL CALIPER FOR INNER GROOVES
The DITRON 628 series is designed for internal groove width measurement in accessible bores.
Before selecting a model, check that the hook can pass through the entrance, reach the groove and contact the intended faces without interference.
Available models and catalogue specifications:
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
DITRON 629 — INTERNAL DISTANCE DIGITAL CALIPER
The DITRON 629 series provides a different contact arrangement for suitable internal distances and groove features.
The required dimension must be checked against the contact geometry. Do not assume that groove width, groove diameter and groove position can all be measured using the same arrangement.
Available models and catalogue specifications:
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
All dimensions follow the manufacturer’s respective drawings and are in millimetres.
628 VS 629 — SELECTION GUIDE
Choose the 628 series when:
• Internal groove width is the required dimension.
• The hook-type contact arrangement suits the groove.
• The bore entrance and internal clearance allow correct positioning.
Choose the 629 series when:
• Its internal distance contact arrangement matches the required dimension.
• The projecting contacts can reach the intended surfaces.
• The selected range and stated accuracy meet the inspection requirement.
A cross-sectional component drawing is useful for confirming the correct series.
MEASURING RANGE AND CONTACT ACCESS
The listed range does not establish the minimum accessible groove width or bore diameter.
Before ordering, check:
• Bore entrance size.
• Groove width and depth.
• Distance from the entrance to the groove.
• Internal shoulders and obstructions.
• Contact dimensions and clearance.
• Space for inserting and withdrawing the instrument.
Drawing dimensions should not automatically be treated as guaranteed usable insertion depths. Confirm access for the actual component.
ZERO-SETTING AND UNIT CONVERSION
Both series list zero-setting at any position. This allows a selected reference to be used for comparative measurements.
Follow the operating instructions when establishing the reference. Confirm whether the contact arrangement requires a setting standard, preset value or measurement allowance.
Millimetre/inch conversion is also listed for both series.
The catalogue’s wording about relative and absolute measurement conversion does not explicitly establish a coded absolute encoder or reference retention after power loss.
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 components.
For machining workshops and inspection teams in Selangor, Kuala Lumpur, Johor and Penang, select according to the actual measuring surfaces and component tolerance.
ACCURACY AND RESOLUTION
Catalogue-stated accuracy:
628-125: ±0.03mm
628-150: ±0.03mm
628-200: ±0.04mm
628-300: ±0.04mm
629-150: ±0.03mm
629-200: ±0.04mm
629-300: ±0.04mm
The supplied catalogue page does not explicitly state display resolution for either series. Confirm this separately before including it in a purchasing specification.
Results also depend on alignment, reference setting, contact force, cleanliness and instrument condition.
BASIC MEASURING PROCEDURE
1. Identify the required dimension on the component drawing.
2. Check insertion and withdrawal clearance.
3. Clean the measuring contacts and workpiece.
4. Establish the reference according to the operating instructions.
5. Position the contacts against the intended surfaces.
6. Check for interference from edges, shoulders and radiused corners.
7. Apply light, consistent measuring force.
8. Read and record the result.
9. Repeat the measurement to assess consistency.
10. Withdraw the contacts carefully.
Do not force the hook or contacts through a restricted opening.
CARE AND STORAGE
• Protect projecting contacts from bending and impact.
• Keep the beam and sliding surfaces clean.
• Remove chips 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.
FREQUENTLY ASKED QUESTIONS
What is the main difference between the 628 and 629?
The 628 is specifically described for internal groove width measurement. The 629 uses a different arrangement for internal distance and suitable groove measurements.
What ranges are available?
The 628 lists 125mm, 150mm, 200mm and 300mm models. The 629 lists 150mm, 200mm and 300mm models.
Can either model measure every internal groove?
No. Contact geometry, entrance clearance and groove location must match the application.
Can the 628 measure groove diameter?
Groove diameter capability is not established by the supplied page. Confirm the required measurement separately.
What is the display resolution?
It is not explicitly specified on this catalogue page.
Can readings be zeroed at a selected reference?
Yes. Zero-setting at any position is listed for both series.
Can they switch between millimetres and inches?
Yes. Both series list this function.
Are these rechargeable models?
Rechargeable operation and Type-C charging are not specified on the supplied page.
Are they waterproof?
The supplied page does not explicitly state an IP protection rating.
Is a calibration certificate included?
The catalogue page does not confirm that an individual calibration certificate is included. Specify documentation requirements when requesting a quotation.
SEO META DESCRIPTION
Explore DITRON 628 and 629 digital groove calipers in Malaysia for internal groove width and distance measurement, with ranges up to 300mm.
ENQUIRE ABOUT DITRON DIGITAL GROOVE 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
