Author: Liz | Technical review date: 2026-10-15
When a clock hand is described by its length, buyers should first confirm where that measurement begins and ends. For the clock-hand measurement convention shown on Heng-Rong's product pages, the useful reference is the mounting-hole center to the forward tip. This is different from measuring the entire piece from its rear tail to its front end.
This guide explains how to prepare a clear measurement record for a replacement set or a wholesale inquiry. It does not provide universal fitting dimensions or a movement load limit. Length, fitting, material and the intended movement must be reviewed together before approving a combination.
1. Identify the hand and its reference points
Place the loose hand on a clean, flat surface where its outline and mounting hole are visible. Identify the forward tip that points to the dial markings. If the design also has a tail behind the mounting hole, keep that feature separate in your notes. Do not describe the tail-to-tip dimension as the center-to-tip length.
Label each component before measuring it. Record hour, minute and second hands on separate lines where those components are present. If you cannot confidently identify the function of a loose part, give it a temporary label such as hand A and include a photograph. Ask the supplier to resolve the identification rather than entering a guessed description.
2. Measure from the mounting-hole center
Align a ruler with the hand's centerline and read the distance from the center of the mounting hole to the forward tip. Start from the center, not from the nearest edge of the opening. Keep the ruler in the same plane as the hand and look straight down at the scale to make the reading easier to interpret.
Record the unit beside the result. Millimeters can be used consistently throughout the inquiry, but an existing drawing may use a different unit. If you convert a value, retain the original measurement and identify the converted value. Avoid sending an unlabeled number that could be interpreted in more than one way.
For an irregular tip, forked design or a shape whose measurement endpoint is unclear, annotate a photograph or request a dimension drawing. Show which point you used. A clear endpoint matters more than presenting an apparently precise number without a shared definition.
3. Record total length and rear reach separately
A decorative tail can make the complete hand longer than its forward reach. If the rear portion matters to your design, record its reach from the hole center as an additional measurement. You may also record the overall end-to-end dimension, clearly labeled as overall length.
These measurements serve different purposes. The forward reach describes where the tip will sit relative to the dial markings. The rear outline helps describe the complete shape for an assembly review. Neither dimension, on its own, proves that the hand is balanced or suitable for a particular movement.
Do not shorten, bend or add weight to a hand simply to make it match an inquiry description. Measure the supplied component as it is. If a design change is required, describe the request and ask for the proposed part to be reviewed with the intended movement.
4. Treat the mounting interface as a separate check
Two hands with the same center-to-tip length may have different mounting interfaces. Photograph the hole and hub from both sides. Include a side view if a sleeve, raised section or other fitting feature is present. Ask for the matching interface drawing when the dimensions are unknown.
Heng-Rong's supplied knowledge base distinguishes brass-sleeve and formed-tube hand constructions. It also states that its Young Town-style and Seiko-style hand families are not interchangeable. A length match should therefore never be treated as proof that a hand will fit an existing shaft.
A ruler photograph is useful for showing overall shape and approximate reach, but it is not enough to establish a small fitting tolerance. If you cannot measure the interface reliably, mark it as unconfirmed and discuss a sample or drawing review. Do not force a hand onto a shaft to test an uncertain match.
5. Check the proposed reach on the actual dial
Use a scaled drawing or a nonfunctional layout to compare the proposed hand outline with the dial. Review where the minute-hand tip sits relative to the markings and whether the hour hand remains easy to distinguish. Consider the surrounding frame, printed decoration and any raised features.
The diameter of the dial alone is not a complete hand specification. The position of the markings and the shape of the hand also matter to the visual result. Record your preferred layout as a design requirement, then confirm the assembly with the supplier rather than applying an assumed universal proportion.
Keep visual approval separate from mechanical approval. A hand can look suitable on a drawing while the full assembly still needs a review of fitting, spacing and movement capability. Follow the instructions for the selected parts when evaluating the actual sample.
6. Include material and weight information when available
Record the material and thickness from a reliable drawing or supplier reference if they are known. If you have measured the weight, state what was weighed and the unit used. If not, leave the field unconfirmed. The latest supplied knowledge base notes that hand weight varies with length and design; a length value is not a substitute for a weight specification.
Heng-Rong's clock hands are sourced components. When requesting a coordinated movement-and-hand set, identify both parts and ask for confirmation of that exact combination. Avoid assuming that every hand in a style family has the same load characteristics or that a movement category guarantees compatibility.
7. Send a measurement record that can be checked
Use a separate record for each hand design and retain the photographs with it. The following fields help a supplier understand both the measured part and the information still missing.
- Hand reference or temporary identification label.
- Intended hour, minute or second-hand function, if confirmed.
- Mounting-hole center to forward tip, with unit.
- Rear reach and overall length, if relevant.
- Front, back and fitting close-up photographs.
- Material, thickness and measured weight, if known.
- Existing or proposed movement model and shaft version.
- Dial layout, desired finish and required quantity.
- Unconfirmed dimensions and questions for the supplier.
Before ordering, compare the supplier's returned drawing with your record. Resolve any difference in endpoint, unit or hand identification and keep the approved revision with the quotation. Browse the clock hand range for a style reference, then send your measurements and photographs to Heng-Rong for review.