A 34 mm measurement does not identify a complete NTN cam follower: it could refer to the outer diameter, stud diameter, or track width. You will be able to define the required designation, check the mechanical fit and load data, and prepare a supplier request that prevents an incorrect replacement.
Key takeaways
- Treat 34 mm as an incomplete dimension, not a bearing identification.
- Match outside diameter, width, stud, mounting height, and thread to the drawing.
- Specify radial load, speed, track hardness, lubrication, and seal construction.
- Request the full NTN designation, suffix, lead time, and traceable documentation.
What does “34 mm” identify on an NTN cam follower?
34 mm identifies only a dimension, not an NTN cam follower bearing. It could mean the outside diameter, stud diameter, roller width, or another controlled dimension. Without the complete NTN catalogue designation and suffix, “34 mm NTN cam follower bearing” is incomplete and cannot confirm interchangeability.
The relevant product family may be a stud-type track roller, not a conventional radial ball bearing. Its identification also depends on the complete part number, seal suffix, lubrication or grease suffix, and any relubrication provision.
Record the original marking on the bearing and the matching marking on the box; do not rely on a supplier’s description alone.
Use this verification procedure before ordering:
- Ask which dimension measures 34 mm: outside diameter, stud diameter, roller width, or another drawing dimension. A single figure is not an adequate NTN cam follower bearing size lookup.
- Request the exact NTN catalogue designation, suffixes for seals and lubrication, and the manufacturer’s dimensional drawing with tolerances.
- Compare the drawing with the machine requirement, including stud length, mounting style, thread and overall dimensions. Request the country of origin where applicable.
- Treat a caliper reading as an identification clue, not proof of interchangeability. Seal protrusion, nearby standard sizes, and dimensional tolerances can change the measured value.
- Match the original bearing and box markings to the quotation before release. A drawing, catalogue designation, and traceable marking are essential for ordering the correct replacement.
Which dimensions must match the machine drawing?
Match the machine drawing, not merely the removed bearing. A cam follower bearing for machinery transfers load through the stud, shoulder, nut and housing, so one matching diameter does not prove fit.
Use this dimensional checklist:
- Outer-ring diameter and width, plus the track width needed for proper contact
- Stud diameter, stud length and mounting length
- Shoulder diameter, shoulder width and any relief dimensions
- Wrench-flat size and position
- Mounting-thread size, pitch and threaded length
- Eccentric-collar diameter, offset and adjustment range, when applicable
- Housing-hole depth, bore clearance and room for the nut, washer and tightening tool
Compare each value with the machine drawing’s nominal dimension, tolerance and datum. Check the housing hole against the stud and shoulder before checking the old part; wear, corrosion or a previous modification can make the old bearing misleading.
Request the manufacturer’s dimensional drawing with tolerances, especially for fit-critical dimensions, thread details, shoulder geometry and track width.
The outer-ring form is a separate selection:
| Option | Contact condition | Select when |
|---|---|---|
| Crowned outer ring | Accommodates limited misalignment and reduces edge loading | The track or alignment can deflect |
| Cylindrical outer ring | Supports full-width contact only with suitable geometry and alignment | The track is flat, hard and accurately aligned |
Do not substitute a cylindrical ring for a crowned ring, or the reverse, solely because both measure 34 mm. Treat an NTN cam follower bearing size as a designation-and-drawing lookup, not a single-diameter measurement; confirm the exact part number and suffix before ordering.
How should load, speed, track and construction be specified?
Specify a cam follower bearing for machinery by its load case, speed, track and construction—not by 34 mm alone. For 34 mm NTN cam follower bearing specifications in Delhi, request:
- Radial load, axial load, shock and acceleration loads, basic dynamic load rating C, and basic static load rating C0.
- Permissible speed, fatigue or rating-life data, and the calculated duty cycle.
- Grease grade, base oil or thickener, operating-temperature range, and relubrication interval and method.
- Roller construction, cage arrangement, stud material and hardness, and outer-ring hardness.
Use ISO 281 for dynamic life: L10 is proportional to (C/P)^p, with p = 3 for ball bearings and p = 10/3 for roller bearings. Set P from the actual applied load, including shock, acceleration, misalignment and oscillation, not the nominal machine load alone.
Dynamic life does not prove static safety. Check basic static load rating under ISO 76 when the follower is stationary, shock-loaded or oscillating; permanent deformation or brinelling can govern before calculated fatigue life expires.
Inspect the mating track as carefully as the bearing. Specify track hardness, surface finish, flatness, width, lubrication and cleanliness. A soft, dirty or damaged track can produce brinelling, pitting, smearing or edge wear despite an adequate catalogue rating.
For a cam follower bearing for machinery, also identify whether the roller is cylindrical or crowned and request its construction details. These data let you compare a 34 mm NTN cam follower bearing for machinery against the machine duty rather than accept an unspecified dimensional substitute.
How do you install and protect a stud-type follower?
A loose stud can damage the housing even when the rolling elements are correctly rated. Use the NTN drawing for the identified part number and confirm the stud diameter, thread, shoulder dimensions, mounting length, wrench flats, and housing support before installation.
- Clean the mounting hole, shoulder seat, and track; remove chips, old grease, and abrasive dust.
- Insert the stud in the specified direction. Support the inner stud end where the drawing requires it, rather than allowing the housing to carry the load through an unsupported section.
- Fit the stated washer and nut, then clamp the stud using NTN’s specified tightening method. Obtain the exact tightening torque from the NTN data sheet or supplier confirmation for that part number and thread; do not guess it.
- Prevent stud rotation with the wrench flats or the specified locking arrangement. Never tighten the nut while using the outer ring as a reaction surface.
- Align the track with the outer-ring centreline and move the cam follower bearing for machinery through its complete stroke. Stop if it binds, cocks, or shows side loading.
| Design choice | Protection provided | Installation implication |
|---|---|---|
| Sealed follower | Excludes dust and retains grease | Prefer it for dusty Delhi factory machinery |
| Open follower | Easier access for relubrication | Requires protected storage and a cleaner track |
Use grease compatible with the NTN fill. Excess or incompatible grease increases heat and running torque, so contamination protection is not a reason to overpack the follower.
What should you ask a Delhi supplier to quote?
State what “34 mm” measures before asking for a price: outer diameter, stud diameter, or width. A 34 mm ntn cam follower bearing for specifications in delhi is not identifiable without the complete NTN designation and suffix.
1. Ask the cam follower bearing supplier in Delhi to quote the exact NTN part number and suffix printed on both the bearing and packaging.
Request the original catalogue drawing, dimensional tolerances, dynamic and static load ratings, permissible speed, lubrication and seal specification, mounting-torque instruction, country of origin where applicable, quantity, lead time, and a traceable invoice.
2. Attach your machine data: radial and axial loads, operating speed, stroke or oscillation pattern, track material and hardness, ambient temperature, contamination level, and delivery quantity. State whether the requested 34 mm dimension is the outer diameter, stud diameter, or width; do not accept an unspecified “34 mm” substitute.
3. Ask the supplier to confirm the exact model against these inputs, including whether it is a stud-type track roller, its seal and grease suffix, and its mounting requirements. Dimensional checks alone cannot establish authenticity: counterfeit or mixed-stock bearings can share nominal dimensions while differing in steel, heat treatment, seals, or grease.
Shreeji Industrial Corporation LLP can be included in this comparison as a Delhi source, provided its quotation identifies the exact NTN model and supplies the requested documentation rather than relying on a single measured dimension.
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Frequently asked questions
What does “34 mm” identify on an NTN cam follower?
It identifies only one possible dimension, such as outside diameter, stud diameter, or roller width. Confirm the complete NTN designation and suffix before selecting a replacement.
Which dimensions must match the machine drawing?
Match the roller outside diameter, roller width, stud diameter, mounting height, thread size and pitch, hex or wrench feature, and overall length.
How should load, speed, track and construction be specified?
Provide radial and axial loads, speed, duty cycle, track material and hardness, lubrication method, temperature, sealing requirement, and needle-roller or spherical-roller construction.
How do you install and protect a stud-type follower?
Use the specified hole and thread, support the stud correctly, tighten to the maker’s torque, align the track, lubricate through the correct passage, and protect seals from contamination.
What should you ask a Delhi supplier to quote?
Ask for the complete NTN designation, suffix, dimensions, load and speed ratings, seal type, quantity, price, stock status, lead time, country of origin, invoice, and warranty terms.
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