An H22 tapered drill rod should not pass pre-shipment inspection merely because it is hexagonal, looks straight and fits inside the planned bundle. Release should be based on a controlled purchase specification: exact rod designation, shank configuration, taper system, ordered length, flushing arrangement, approved dimensions or drawing, quantity, inspection method, marking and packing requirements.
The buyer should define acceptance criteria before production. ISO 1718 establishes basic dimensions for drill rods and tapered connections used in percussive rock drilling, but it does not replace the purchase order, approved product drawing or the tolerances agreed for a specific order. This guide therefore explains what to verify and what evidence to request without inventing one universal straightness, hardness, taper or dimensional limit for every H22 rod.
H22 tapered drill rod pre-shipment inspection at a glance
| Inspection gate | Buyer question | Evidence to retain |
|---|---|---|
| Document control | Is the inspection using the same specification and drawing revision as the purchase order? | PO, approved drawing/specification, revision and inspection plan |
| Identity | Does the rod match the ordered H22 shank, taper system, length and flushing configuration? | Item-level or batch-level measurement record and photos |
| Visual condition | Are there cracks, folds, heavy scale, corrosion, deep marks, burrs or handling damage? | Inspection photos and nonconformance record where required |
| Geometry | Are hex body, shank, collar, taper, length and bore features within agreed limits? | Measured values, calibrated-tool references and sample identification |
| Straightness | Was full-length bow or runout checked using the agreed support and measurement method? | Straightness/runout result tied to the inspected rod or sample |
| Compatibility evidence | Does the taper and shank match the intended rock drill and bit system? | Approved mating references or fit/gauge check |
| Quantity and traceability | Can the buyer connect the delivered bundle to the order and inspection result? | Count sheet, bundle identity, batch reference and packing list |
| Packing | Are rod ends, straightness and surface condition protected for the planned transport route? | Final bundle and container-loading photos |
1. Freeze the acceptance basis before inspecting rods
A useful inspection starts with a document hierarchy. The purchase order identifies what was bought; the approved specification or drawing defines the technical details; the inspection and test plan defines who checks what, when and how; and the packing instruction defines the shipment condition. If these documents disagree, inspection should pause until the conflict is resolved.
At minimum, the order should control:
- H22 hex designation and complete shank description;
- shank length and collar configuration;
- taper angle or exact compatible bit family;
- overall or effective rod length and the length reference points;
- flushing hole or water-channel configuration;
- material and heat-treatment requirements only when contractually specified;
- dimensional and straightness tolerances;
- visual acceptance criteria;
- inspection sampling or full-inspection requirements;
- marking, rust protection, bundling and shipping requirements.
Do not use “standard H22 rod” as a complete specification. H22 describes the nominal hex system, but it does not by itself settle every shank, taper, length, bit or rock-drill interface. For system matching, review the published H22 × 108 mm drill steel compatibility guide and the 7°, 11° and 12° taper compatibility guide before approving the inspection drawing.
2. Confirm inspection tools, method and sample identity
An inspection report is only useful when the measured rod, instrument and method are identifiable. Record the instrument type, calibration status or internal control reference, inspection date, inspector and the sample or bundle identity. If the buyer requires third-party inspection, define witness and hold points before the goods are packed.
Sampling must also be agreed. A small first order, new supplier, revised design or history of nonconformance may justify a different inspection level from a stable repeat order. Do not copy a sample percentage from another product and treat it as an industry rule. The PO or inspection plan should specify whether a characteristic is checked on every rod, on a statistically defined sample, or only as a documented batch test.
3. Perform a full visual inspection before dimensional measurement
Clean enough of the surface to inspect it properly without removing evidence of a manufacturing or handling defect. Under suitable lighting, examine the complete rod, then focus on the shank, forged collar, taper transition, rod flats, corners and both ends.
Record visible conditions such as:
- cracks or crack-like indications;
- laps, folds, seams or heavy scale that interrupts the surface;
- deep grinding marks, gouges, dents or sharp burrs;
- uneven forging at the collar or transition;
- corrosion, pitting or water staining beyond the agreed condition;
- blocked or visibly off-center flushing openings;
- impact damage to the taper, shank or collar;
- coating or rust-preventive condition inconsistent with the order.
Visual acceptance should be defined by the contract, approved sample or agreed workmanship standard. A photo can document a condition, but it cannot prove the depth of a discontinuity or the absence of a hidden defect. When the order calls for magnetic-particle, ultrasonic or another examination, visual inspection does not replace that requirement.
4. Verify the ordered length and H22 body dimensions
Before measuring, confirm the length definition. “Rod length” may be understood as total length, effective length, working length or another drawing-defined reference. A measurement is meaningless if supplier and buyer use different endpoints.
Measure the agreed characteristics and record actual values rather than only writing “pass.” Depending on the order, these may include:
- overall or effective length;
- hex size across flats;
- shank length and relevant shank dimensions;
- collar position, thickness or diameter where controlled;
- taper length and diameters at specified reference locations;
- flushing-hole diameter, position or continuity;
- end-face condition and transition geometry.
The active PerfoMax commercial reference for this route is the H22 × 108 mm tapered drill rod with an 11° connection option. Use that page only when it matches the planned system. Other H22 shank or taper configurations should be treated as separate requirements, not inferred from this product title.
5. Check straightness using a controlled support and measurement method
Straightness affects handling, chuck alignment and drilling behavior, but the result depends on how the rod is supported and measured. An unsupported long rod can sag; an uneven floor can create a false wobble; checking only one short section can miss full-length bow.
A controlled method may support the rod on rollers or defined points, rotate it and measure runout at agreed stations with an indicator. Another approved method may reference the rod against a straight fixture and measure deviation. The inspection plan should state:
- support-point location and orientation;
- whether the rod is rotated and how;
- measurement stations along the length;
- whether the reported result is bow, runout or another defined value;
- instrument resolution;
- the acceptance limit from the PO or drawing.
Photographing a rod rolled on a table may help screen obvious bends, but it is not equivalent to a recorded dimensional result unless the table, support method and acceptance rule are controlled. If a rod fails straightness, do not approve unplanned straightening or rework; require a documented disposition and reinspection.
6. Inspect the shank, collar and taper as separate functional zones
The shank enters the rock drill chuck, the collar establishes a functional relationship with the drill, and the taper connects to the bit. Each zone has a different mating component, so one acceptable diameter cannot prove the whole rod is compatible.
For the shank, confirm the complete ordered designation and relevant dimensions against the approved drawing or known-good mating reference. Check the flats, corners, end face, flushing entry and transition for burrs or deformation that could interfere with insertion or impact transfer.
For the taper, verify the exact taper system rather than judging it by eye. A buyer-defined gauge, controlled dimensional method or approved mating component can provide evidence. Record the taper reference, gauge identity and result. If using a mating bit for a functional check, make sure the bit itself is verified and represents the intended configuration.
Do not force an uncertain fit or use repeated impact seating as an inspection method. Damage created during checking can mask whether the original rod was conforming.
7. Verify flushing-hole continuity and internal cleanliness
A central or internal flushing passage must match the ordered configuration and remain open through the rod. Inspection can confirm visible alignment, entry condition and continuity by the method agreed in the inspection plan. If air, water or a probe is used, define safe pressure, cleanliness and pass criteria rather than improvising at shipment release.
Look for blocked openings, heavy contamination, scale, chips or damage at the inlet and outlet. Protect the passage after inspection so packing material, rust preventive or transport debris does not create a new blockage.
8. Match documents to the actual batch
Certificates and reports should be traceable to the goods being shipped. A generic material certificate, hardness sheet or inspection report with no batch link does not prove that it belongs to the inspected rods.
When documentation is required, check:
- supplier and purchase-order reference;
- product designation and drawing revision;
- batch, heat or production reference where applicable;
- inspection quantity and sample identification;
- actual results and specified limits;
- instrument or test-method reference;
- inspection date and authorization;
- clear statement of deviations, rework or concessions.
Do not demand certificates that were never specified and then use their absence as a rejection reason. Conversely, do not waive an agreed traceability or test document because the physical rods look acceptable. The contract should align evidence with the risk and order value.
9. Count, protect and pack the rods without creating new defects
Final inspection is not complete until quantity and packing are verified. Count the rods per bundle and total order, confirm the bundle identity, and reconcile the count with the packing list. Mixed lengths, tapers or shank configurations should be separated or unmistakably controlled.
Packing should prevent metal-to-metal damage, moisture exposure, lost end protection and bending during lifting or transport. Check that:
- taper and shank ends are protected as ordered;
- bundles are supported at suitable points;
- strapping restrains the load without damaging rod edges;
- different items cannot be mixed during loading;
- surface protection is compatible with the buyer’s storage and handling plan;
- bundle markings and packing documents identify contents without ambiguity;
- final photos show quantity, supports, protection and loading condition.
10. Control nonconformities before shipment release
If a result is outside the approved requirement, identify and segregate the affected rods. Record the characteristic, measured value, specified limit, quantity affected and supporting photos. The supplier should propose a disposition: rework, replacement, sorting, concession request or rejection.
A concession is a buyer decision, not an automatic supplier remedy. It should state the exact deviation, affected quantity, technical rationale, validity for this order and any commercial or warranty condition. Reworked rods should be reinspected for the original characteristic and any new risk introduced by the rework.
Do not release the shipment while a hold point, open nonconformance or missing required record remains unresolved.
Common pre-shipment inspection mistakes
- Accepting “H22” without controlling shank, taper, length and flushing details.
- Measuring length from different reference points on supplier and buyer reports.
- Using one visually similar bit as proof of taper compatibility.
- Reporting only “pass” without actual dimensional values.
- Checking straightness on an uncontrolled floor or table.
- Using a certificate that cannot be tied to the shipped batch.
- Inspecting unpacked rods but not the final protected bundle.
- Allowing mixed variants in one bundle without item control.
- Accepting unapproved rework without reinspection.
- Applying generic online tolerances instead of the agreed PO or drawing.
Buyer release checklist
- PO, approved drawing and inspection plan use the same revision.
- H22 shank, taper system, ordered length and flushing configuration are explicit.
- Sampling or full-inspection scope is approved.
- Visual condition is acceptable and documented.
- Actual dimensional results are recorded.
- Straightness method, stations and result are reproducible.
- Shank and taper compatibility evidence matches the intended drill and bit.
- Required material, heat-treatment or NDT documents are batch-traceable.
- Quantity, bundle identity and packing list reconcile.
- Ends, surfaces and straightness are protected for transport.
- All nonconformities and concessions are closed.
- Final shipment release is authorized only after all required inspection records and nonconformities are closed.
If the buying question is primarily about selecting length rather than accepting a completed order, use the published H22 tapered drill rod length guide first. Then place the chosen configuration into the PO and inspection plan.
Frequently asked questions
Does H22 × 108 mm guarantee that any tapered bit will fit?
No. H22 and the shank description do not by themselves establish the bit taper. Confirm the exact taper system on both rod and bit, together with any supplier-specific geometry and the intended rock drill interface.
What is the correct straightness tolerance for an H22 rod?
Use the tolerance agreed in the purchase order, approved drawing or applicable standard for that product. Do not import a limit from another rod length, manufacturer or drilling system without technical approval.
Should every drill rod be measured before shipment?
That depends on the agreed inspection plan, order risk, supplier history and characteristic. Some checks may be applied to every rod, while others may use an approved sample or batch test. Define the scope before production.
Can a material certificate prove that the finished rod is acceptable?
No. A traceable material certificate can support raw-material verification, but it does not prove finished dimensions, straightness, taper compatibility, surface condition, quantity or packing. These require their own inspection evidence.
What should happen if one sampled rod fails?
Follow the approved sampling and nonconformance procedure. Identify the affected batch, expand inspection or sort where required, determine the disposition, and close the issue before release. Do not simply replace the measured sample and ignore the batch risk.
Prepare an inspection-ready H22 tapered drill rod inquiry
For a quotation or inspection discussion, send the rock drill model, shank requirement, taper system, rod length, bit reference, application, quantity, destination and any buyer-specific inspection or document requirements through Request a Quote. PerfoMax can then review whether the active H22 rod route is relevant without treating an incomplete designation as proof of compatibility.
Bottom line: a useful H22 tapered drill rod pre-shipment inspection proves that the shipped rods match a controlled order—not merely that they resemble H22 drill steel. Freeze the acceptance basis, record actual results, verify the shank and taper separately, protect traceability, and close every deviation before shipment release.