Honed bore
/glossary/honed-boreInternal surface finished by abrasive honing to precise diameter and surface roughness.
Honed bore is an ID finished with abrasive stones to a controlled geometry and, when specified, a cross-hatch. Dada Nagar shops, about 8 km from Bartan Bazar, order it on DIN 2391 ST52 or EN 10305-1 E355. Hydraulic-cylinder pages on this site treat a finished barrel as Ra 0.2-0.4 μm after honing or SRB. Write H8 or H9 on the drawing; honing does not create them.
In detail
Honed bore is an internal surface finished with abrasive stones to a controlled geometry and, when specified, a cross-hatch that holds oil. Hydraulic-cylinder pages on this site treat a finished barrel as H8 or H9 with Ra 0.2-0.4 μm after honing or SRB; those figures belong on the drawing, not on the process name. The mother tube is usually DIN 2391 ST52 or EN 10305-1 E355, then honed. Honing is not a substitute for skiving unless the drawing allows it.
What honed bore is, and what it is not
Honing is an abrasive pass. Stones reciprocate and rotate on the ID, leaving a cross-hatch that holds oil for a piston seal. The starting tube is almost always cold-drawn seamless, DIN 2391 ST52 or EN 10305-1 E355, often BK+S. In Dada Nagar, CDW welded tube serves as cover stock rather than the piston-seal bore.
Honed is not skived and roller-burnished. Skiving cuts a chip; burnishing then plastic-smooths the peaks. Some seals want the honed cross-hatch. High-volume production may instead use the roller-burnished surface. Copy the seal-supplier note onto the RFQ.
Honed is not a material grade and not a pressure rating. A schedule number or an ST52 stamp does not fix working pressure. Size, remaining wall after the hone, material allowable stress, and the cylinder design code do. Honed is also not chrome on the rod and not a phosphated OD film.
H8 and H9 are ISO 286 hole-basis classes. ISO 286-1:2010 puts the H-hole lower deviation at zero and the tolerance zone in the plus direction. The millimetre upper deviation sits in ISO 286-2 for that nominal size. Do not treat BK+S H8 as a default mill condition. Write the class next to the process.
Who should order honed, and who should not
Order honed when the approved cylinder drawing names a cross-hatch, when the batch is a repair barrel, or when the shop will finish the bore after welding ports. Dada Nagar hydraulic-cylinder shops and Panki press builders use that route on ST52 / E355. Printing-cylinder work in Kanpur is a different bore: the printing pages specify H8 with Ra ≤ 6.3 μm, much rougher than a hydraulic seal face.
Order skived and roller-burnished when the drawing allows SRB and the shop wants a short production cycle. Hydraulic-cylinder pages treat both routes as Ra 0.2-0.4 μm after finishing. For SRB, the DIN 2391 ST52 product page gives H8 with Ra ≤ 0.4 μm as the standard call-out and Ra 0.2 μm as a premium.
Do not order honed tube for IS 1239 water lines, GI hydrants, borewell casing, or boiler superheaters. Those families use ERW, GI, or SA grades. Do not send hydraulic SRB or honed stock into an engraver RFQ without the engraver's written note. Issue printing cylinder and hydraulic requirements on separate POs.
IS 3601 H8/H9 appears on this site as a cost-focused option for agricultural tipping cylinders, with a rougher Ra 0.8 call-out than DIN 2391 honed. Treat that as a procurement label. The drawing still names bore, finish, OD, wall, and delivery condition.
Honed versus SRB versus as-drawn
Pick the process before the PO. This site's roughness call-outs use Ra under ISO 4287. The current ISO profile-parameter standard is ISO 21920-2:2021, which revises ISO 4287:1997 according to the catalogue retrieved 2026-09-03. Local RFQs still write Ra.
| Attribute | Honed | Skived + roller burnished | As-drawn CDS |
|---|---|---|---|
| Process | Abrasive stones, cross-hatch | Cut, then roller smoothing | Cold-drawn ID, no seal finish |
| Typical Ra on this site | 0.2-0.4 μm after honing | 0.2-0.4 μm; 0.2 μm premium | Not a seal-face figure |
| Bore class | H8 or H9 if specified | H8 or H9 if specified | Drawing OD/ID only |
| Best fit | Repairs, named cross-hatch, post-weld finish | Production barrels, short cycle | Blank for in-house hone |
| Kanpur buyer | Dada Nagar repair and press shops | Repeat OEM barrels | Shops with their own hone |
Straightness on the DIN 2391 ST52 product page is 1 mm per metre or better. Typical supply length is 6 m random, with cut-to-length also available. Ask the dimensional report to state finished ID, roundness, and straightness per metre, not only OD.
How to specify a honed bore on an RFQ
A line that reads "100 × 90 hydraulic tube" starts a dispute. Say whether that is OD × ID or OD × wall, whether the bore is honed, SRB, or as-drawn, and whether the class is H8 or H9.
- Tube grade: specify DIN 2391 ST52 or EN 10305-1 E355, with BK+S delivery unless the drawing says otherwise.
- Size: finished OD × ID, or OD × wall with honing stock stated. Then state quantity, cut length, and machining allowance.
- Bore: honed, H8 or H9, Ra max in μm. If the drawing uses ISO 4287, carry that designation into the RFQ. Cross-hatch if the seal note requires it.
- Require straightness, roundness, and one dimensional report per tube. Add a profilometer trace for Ra on honed tubes.
- ID uncoated. OD may be phosphated and oiled. Caps on both ends.
- Documents: EN 10204 3.1 MTC, heat number, roughness report. TPI by SGS, Bureau Veritas, Lloyds, or TUV if the OEM ITP names it.
- Delivery: ex-warehouse Kanpur. Add 18% GST on the budget sheet for the tube line. Lined cradles. No loose stacking.
Worked mass example for a 63 × 4 mm honed barrel
Steel mass uses W = (OD − t) × t × 0.02466 kg/m, with OD and wall in millimetres. For the 63.0 mm OD × 4.0 mm wall row on the precision tube price list, W = (63.0 − 4.0) × 4.0 × 0.02466 = 59 × 4 × 0.02466 = 5.82 kg/m. A 6 m length is 34.92 kg.
That DIN 2391 row is ₹98-122 per kg as of 24 May 2026, ex-warehouse Kanpur. The 6 m tube is a steel-mass budget of 34.92 × 98 = ₹3,422 to 34.92 × 122 = ₹4,260 before GST, freight, and any hone premium. Honing removes a thin ID layer, so finished-bore mass sits slightly below the mother-tube theoretical mass. Invoice weighment at the yard is the commercial mass.
Pressure design must use minimum wall after the hone, not 4.0 mm if the stones take the ID out. State the post-hone remaining wall on the drawing before issuing the RFQ; do not wait until ports are welded.
Common mistakes on honed-tube orders
A frequent first mismatch is "honed" on the drawing and SRB on the invoice. Get a written substitution before the truck leaves Kanpur. Surface texture makes seal-supplier substitutions non-interchangeable.
The second error is treating H8 as a symmetric plus-or-minus band. ISO 286 H is hole-basis: lower deviation zero, plus-only zone. Copy the millimetre limits from the invoked ISO 286-2 table for that bore. The precision hub on this site refuses a ±0.027 mm figure as an acceptance window.
The third error is an uncapped bore on a monsoon run to Lucknow (80 km via NH-27) or Patna. Flash rust on a honed skin is scrap. Caps and oil are part of the product.
The fourth error is using CDW as the seal bore because it is cheaper. Cover tubes can be CDW. The piston-seal ID is CDS, then honed or skived.
The fifth error is skipping the roughness report. An MTC 3.1 proves chemistry and BK+S. It does not prove Ra 0.4 μm. Ask for the profilometer trace.
Standards for honed hydraulic tube
Mother-tube requirements come from DIN 2391-1:1994 and EN 10305-1:2016. For hydraulic power systems, EN 10305-4:2016 is the applicable part. ISO 286-1:2010 is the H8/H9 code system. ISO 286-2 holds the numerical tables. EN 10204:2004 is the inspection document. Each designation already appears on the precision-tube cluster.
ISO 21920-2:2021, Geometrical product specifications, Surface texture: Profile, Part 2, is the current ISO profile-parameter standard (ISO catalogue retrieved 2026-09-03). The catalogue life-cycle marks ISO 4287:1997 as withdrawn and revised. Kanpur RFQs here nevertheless continue to specify Ra under ISO 4287. Carry the drawing's parameter onto the PO so the mill and inspector work to one ISO designation.
There is no BIS honing standard on this site. Honing describes a finishing route rather than a material grade. Cylinder barrels do not fall under the IBR pressure-part category. For IBR work, Form III-B certifies tubes, while Form III-C certifies boiler mountings and fittings; place these requirements on boiler SA213 RFQs rather than a cylinder-bore PO.
Buying honed cylinder tube in Kanpur
Dada Nagar, about 8 km from the Bartan Bazar / Basanti Nagar (208014) yard, is the local barrel cluster. Shops there take ST52 BK+S, then hone or SRB to the drawing. The same stock also serves Panki press and mobile-equipment cylinder shops about 12 km from the yard. Jajmau (about 10 km) is hide-process steam work, not a honed-bore buyer.
Honed finishing is a separate mill line. Stocked as-drawn sizes leave the Kanpur yard on the glossary lead-time band for stock items (3-7 days). A hone or SRB pass sits on the mill-direct window for that size. Intra-Kanpur pickup against challan is still common. See DIN 2391 ST52 honed-bore, hydraulic cylinder industry, and precision tubes, hydraulic applications.
The homepage lists Uttar Pradesh, Bihar, Madhya Pradesh, Delhi NCR, and Uttarakhand as the Kanpur service area. Steel pipes in Kanpur and the Kanpur steel market page cover yard practice. PWD and JJM tenders almost never want honed precision tube; they want IS 1239 / IS 3589 water pipe. Keep those RFQs on the ERW pages.
Indicative DIN 2391 bands on the precision tube price list run ₹95-150 per kg by size, ex-warehouse Kanpur, as of 24 May 2026. The 63.0 × 4.0 mm row used above is ₹98-122 per kg. Ask for honed versus SRB as two lines.
Inspection points on a honed barrel
Incoming inspection at a Dada Nagar shop should read finished ID at several stations, roundness, and straightness per metre. The dimensional report travels with the MTC and the challan. Heat numbers on the tag must match both papers.
Ra is a profilometer number, not a visual guess. Keep the same ISO parameter (4287 Ra or 21920-2) on the drawing, the PO, and the trace. A shop that hones after welding ports must re-check straightness; removing stock can move the axis.
Wall after honing is the design wall. Record it before the barrel sees pressure. Barlow and the cylinder standard see remaining wall, not the mother-tube nominal.
Packing honed tube for UP and North India dispatch
Cap both ends. Oil the bore. Sit tubes in lined wooden cradles. ERW and precision tubes may share a truck only when the precision bundle has its own cradles. Do not let an IS 1239 bundle rub a honed mouth.
Lucknow is 80 km via NH-27. Unnao is 18 km. Patna, Gorakhpur, and Bareilly take the same Kanpur-origin service area listed on the FAQ. Name the PIN, gate hours, and unloading method on the RFQ so the carrier can protect the bore.
RP Sales includes the MTC with each dispatch. The roughness report is extra and must be in the same envelope. TPI at the yard is coordinated when the RFQ names SGS, Bureau Veritas, Lloyds, or TUV.
Hydraulic shops versus printing-cylinder bores
Kanpur has both trades. Route each order against its approved application drawing: hydraulic barrel work needs the seal-face call-out, while printing-cylinder work needs the engraving allowance and final inspection plan. Keep their RFQs separate.
Fire-system installers, borewell contractors, and PWD / JJM bidders do not belong on this page. Their pipe is GI pipes in Kanpur, drill and borewell pipes in Kanpur, or MS ERW in Kanpur.
Sugar-mill shutdowns buy boiler tube, not honed barrel. Keep SA192 / SA210 / SA213 on the seamless boiler tubes in Kanpur RFQ.
Where you'll meet this in procurement
You will meet Honed bore in manufacturing notes, surface-finish call-outs, and precision-tube RFQs. Confirm that Honed bore is required for the duty (tolerance, bore finish, or coating), and that the quote states the same process the inspector will verify on receipt.
Related terms
Related resources
- Product catalogue
- DIN 2391 ST52 honed-bore tubes
- Skived and roller-burnished tubes
- DIN 2391 ST52 hydraulic tube
- Hydraulic cylinder industry
- Precision tubes, hydraulic applications
- Precision tube price list
- DIN 2391 vs EN 10305
- Steel pipes in Kanpur
- Kanpur steel market
- Printing cylinders
- Request a quotation (RFQ)
- Back to full glossary
Key points
- Honing abrades a cross-hatch. Skiving cuts, then burnishes. They are not automatic substitutes.
- Write H8 or H9 and a Ra limit. Hydraulic-cylinder pages on this site treat a finished barrel as Ra 0.2-0.4 μm.
- H8 is hole-basis: lower deviation zero. Copy millimetre limits from the invoked ISO 286-2 table for that bore.
- Mass for a 63 × 4 mm tube is 5.82 kg/m from (OD − t) × t × 0.02466. Design on wall after honing.
- At roughly 8 km from the yard, Dada Nagar is Kanpur's barrel cluster. Quotes leave the yard ex-warehouse. Budget GST at 18% extra on the tube line.
Frequently asked questions
Sources
- DIN 2391-1:1994. Seamless precision steel tubes. Technical delivery conditions (Deutsches Institut für Normung)
- EN 10305-1:2016. Steel tubes for precision applications. Seamless cold-drawn tubes (European Committee for Standardization (CEN))
- EN 10305-4:2016. Seamless cold-drawn tubes for hydraulic and pneumatic power systems (European Committee for Standardization (CEN))
- ISO 286-1:2010. GPS. ISO code system for tolerances on linear sizes. Part 1: Basis of tolerances, deviations and fits (International Organization for Standardization)
- ISO 21920-2:2021. GPS. Surface texture: Profile. Part 2: Terms, definitions and surface texture parameters (revises ISO 4287:1997) (International Organization for Standardization)
- EN 10204:2004. Metallic products. Types of inspection documents (European Committee for Standardization (CEN))
- Indian Boiler Regulations, 1950. Forms index: III-A steam pipes, III-B tubes, III-C boiler mountings and fittings (Central Boilers Board, Government of India)