Зъбни колела с готов отвор по европейски стандарт | Предварително пробити DIN 8187, готови за монтаж

Зъбни колела с готов отвор-1

Pre-machined finished bore sprockets to DIN 8187 / ISO R606 — keyway and grub screw supplied, bore 10 mm to 100 mm, chain sizes 06B through 20B. No machining required. Fit directly to shaft and run.

Категория:
Запитване сега

06B – 20B

Диапазон на размерите на верижката

10 – 100 mm

Bore Range

H7

Bore Tolerance (Standard)

ISO 9001

Сертифицирано качество

Finished Bore European Standard Sprockets – Product Overview

Корея Евър-Пауър finished bore European standard sprockets are supplied pre-machined to your shaft diameter — bore, keyway and grub screws all done. The installer removes the sprocket from the box, slides it onto the shaft, tightens two grub screws and the drive is ready. No lathe, no broach, no keyway cutter required on site.

The finished bore range covers chain sizes 06B-1 through 20B-1 to DIN 8187 / ISO R606, with bore diameters from 10 mm through 100 mm depending on chain size and tooth count. Every sprocket is pre-bored to H7 tolerance as standard — the correct fit class for a keyed shaft with normal industrial running clearance. H6 (interference fit) and H8 (loose clearance) are available on request for applications with specific assembly or thermal expansion requirements.

The keyway is machined to BS 4235 Part 1 dimensions and supplied with two M-series grub screws positioned 90° apart — one over the keyway and one at 90°. This dual-screw arrangement prevents axial movement of the sprocket under load reversals, which is a common cause of sprocket walk and premature bore wear in single-setscrew designs. The keyway base is machined square and the keyway walls are parallel to within the BS 4235 tolerance, ensuring the key seats fully without rocking.

For shaft sizes outside the catalogue bore range, or for non-standard tolerances, our stock bore European sprockets allow the bore to be machined to any diameter up to the hub maximum. For taper lock bush mounting, see our European taper bore range.

Korea Ever-Power finished bore European standard sprocket pre-bored keyway DIN 8187

⏱ When to choose finished bore

  • Shaft diameter falls within the catalogue bore range
  • No on-site machining equipment available
  • Replacement must be fitted immediately — no lead time for custom boring
  • Standard H7 bore tolerance is acceptable
  • Drive uses a standard parallel key to BS 4235

Bore Tolerance Quick Reference — Which Fit Class Do You Need?

H7  (Standard — supplied as default)

Sliding clearance fit with keyed shaft. Sprocket slides on for assembly and is located by the key and grub screws. Correct for the great majority of industrial conveyor, agricultural and process drives at normal operating temperatures.

H6  (Closer tolerance — on request)

Tighter bore tolerance. Used where accurate sprocket concentricity is critical — high-speed chain drives above 400 rpm, precision timing applications or drives where minimal runout at the sprocket pitch circle is specified by the OEM. Requires careful assembly.

H8  (Loose — on request)

Wide clearance fit. Rarely specified for drive sprockets, but used where differential thermal expansion between the sprocket and shaft is expected — for example, cast iron sprockets running on steel shafts in high-temperature environments, or where paint or coatings will be applied after fitting.

All bores supplied with keyway to BS 4235 Part 1. Grub screw thread diameter and depth match the hub wall thickness at each size. Specify tolerance class H6 or H8 when ordering if required — H7 is supplied if not stated.

Ключ за размери: P = Pitch (mm)  |  de = Tip diameter (mm)  |  dp = Pitch circle diameter (mm)  |  Bore min = smallest finished bore stocked  |  Bore max = largest finished bore for that Z  |  Key = keyway width × depth (BS 4235)  |  Grub screws = 2 off, 90° apart

Finished Bore Sprocket Specifications — 06B through 20B

All bores H7 tolerance as standard. Keyway to BS 4235 Part 1. Two grub screws supplied. Chain sizes below are simplex (-1); duplex (-2) and triplex (-3) hubs available at same bore ranges.

Finished-Bore-Sprockets-dimension-1

Размер на веригата P (mm) Teeth Z де (мм) dp (мм) Bore min (mm) Bore max (mm) Keyway (mm)
06B-1  |  Pitch 9.525 mm  |  Roller Ø 6.35 mm  |  B1 5.72 mm
06Б-1 9.525 9 19.9 17.54 10 12 4×2.5
06Б-1 9.525 11 23.6 21.30 10 14 4×2.5
06Б-1 9.525 13 27.3 25.05 10 16 5×3.0
06Б-1 9.525 15 31.0 28.86 10 18 5×3.0
06Б-1 9.525 19 38.8 36.44 10 20 6×3.5
06Б-1 9.525 25 50.2 47.87 10 25 8×4.0
08B-1  |  Pitch 12.70 mm  |  Roller Ø 8.51 mm  |  B1 7.75 mm
08Б-1 12.70 11 30.0 27.78 12 18 5×3.0
08Б-1 12.70 13 35.2 33.01 12 20 6×3.5
08Б-1 12.70 17 45.2 43.05 12 25 8×4.0
08Б-1 12.70 19 50.2 48.07 12 28 8×4.0
08Б-1 12.70 25 65.0 63.11 15 35 10×5.0
08Б-1 12.70 38 97.0 95.13 20 40 12×5.0
10B-1  |  Pitch 15.875 mm  |  Roller Ø 10.16 mm  |  B1 9.65 mm
10Б-1 15.875 11 37.6 35.09 15 22 6×3.5
10Б-1 15.875 17 57.0 54.70 15 32 10×5.0
10Б-1 15.875 25 82.0 79.76 20 45 14×5.5
12B-1  |  Pitch 19.05 mm  |  Roller Ø 11.91 mm  |  B1 11.68 mm
12Б-1 19.05 11 44.6 41.99 18 28 8×4.0
12Б-1 19.05 19 74.4 72.11 20 45 14×5.5
12Б-1 19.05 25 97.2 95.43 25 60 18×7.0
16B-1  |  Pitch 25.40 mm  |  Roller Ø 15.88 mm  |  B1 15.70 mm
16Б-1 25.40 11 58.8 55.86 22 38 10×5.0
16Б-1 25.40 19 98.5 96.13 28 60 18×7.0
16Б-1 25.40 25 128.4 127.00 35 80 22×9.0
20B-1  |  Pitch 31.75 mm  |  Roller Ø 19.05 mm  |  B1 18.90 mm
20Б-1 31.75 11 72.5 69.82 28 48 14×5.5
20Б-1 31.75 19 121.6 119.52 35 75 20×8.0
20Б-1 31.75 25 160.1 158.75 45 100 28×11.0

Table shows representative tooth counts per chain size. Full range: Z=9 to Z=57 for 06B; Z=9 to Z=57 for 08B–16B; Z=9 to Z=38 for 20B. Intermediate tooth counts available — contact us with your Z requirement. Duplex (-2) and triplex (-3) hubs stocked for 08B through 16B in the most common tooth counts.

Installation in 4 Steps — No Machining Required

The entire installation of a finished bore sprocket requires only a hammer, a hex key and a torque wrench. No machine tools, no qualified machinist, no measuring equipment beyond a basic rule.

Зъбни колела с готов отвор-1

01

Check the Bore Fits

Measure the shaft diameter with a micrometer. Confirm it is within the H7 bore tolerance band for the sprocket ordered. The sprocket should slide onto the shaft with hand pressure — it should not require force and should not be loose enough to rock.

02

Fit the Key

Insert the parallel key into the shaft keyway. The key should be a snug push fit in the shaft keyway — if it rocks, check the key size matches the keyway (BS 4235 key for the corresponding bore diameter). The key should sit flush with or just below the shaft surface.

03

Slide On & Position

Slide the sprocket onto the shaft, aligning the keyway in the bore with the key on the shaft. Push the sprocket to the correct axial position — align the sprocket tooth centreline with the chain centreline using a straight-edge. Do not use the grub screws for final axial positioning.

04

Torque the Grub Screws

Tighten the grub screw over the key first, then the 90° grub screw. Apply thread-locking compound (Loctite 243 or equivalent) to both screws. Tighten to the correct torque for the grub screw thread size — typically 4–8 Nm for M6, 8–14 Nm for M8. Check alignment after tightening.

Приложения

MRO Replacement Drives

The primary use case for finished bore sprockets is maintenance replacement on existing drives. When a sprocket wears out, the shaft diameter and keyway size are already known. A finished bore sprocket with the correct bore and tooth count arrives ready to fit — restoring production without a machining step and minimising downtime. The 08B-1 and 10B-1 sizes cover the majority of European industrial drive replacements.

OEM Machine Builds with Standard Shafts

Machine builders using standard shaft diameters from the catalogue bore range can significantly reduce manufacturing cost by buying finished bore sprockets rather than blank hubs requiring individual boring and keyway cutting. For a production run of 50 machines each with 4 sprocket positions, using finished bore sprockets avoids 200 individual boring and broaching operations. Visit our sprocket product category for the full OEM range.

Agricultural Machinery Service

European agricultural machinery — combine harvesters, balers, mowers, tedders and cultivators — uses predominantly 08B and 10B chain in the header, threshing and conveyor drives. Most shaft sizes in these machines fall within the 12–50 mm finished bore range. Agricultural service workshops that stock finished bore sprockets in the common tooth counts (13, 17, 19, 25T) can service most call-outs without a machining step.

Finished Bore vs Stock Bore vs Taper Bore — Which to Choose?

Критерий Finished Bore Stock Bore Taper Bore
Machining required None — ready to fit Bore, key & setscrew required Bush bore only — at bush supplier
Shaft size flexibility Limited to catalogue bore sizes Any bore up to hub maximum Full range via bush bore
Installation speed Fastest — minutes Slowest — requires machining Fast — 3 screws
Removal for maintenance Slide off (may need puller) Slide off (may need puller) Tool-free — 3 screw ejection
Unit cost Lowest — no extra machining Low (sprocket) + machining cost Sprocket + bush cost
Best for MRO replacement, OEM standard shafts Non-standard shafts, high Z count Frequent changes, reversing drives

For drives with frequent sprocket changes, shock loads or reversing duty, see our European taper bore sprocket range. For non-standard shaft sizes, see stock bore European sprockets.

Технически характеристики

H7 Bore — The Correct Fit for Keyed Shafts

H7 provides a sliding clearance fit on a shaft machined to h6 or k6 tolerance — the two most common shaft tolerance classes for keyed connections in European machine design. The sprocket locates concentrically on the shaft by the key rather than by bore interference, so the clearance in the bore is correct and intentional. Attempting to bore finished bore sprockets to an H6 tolerance removes the bore allowance and risks an interference fit that will prevent assembly.

Dual Grub Screws — 90° Apart

Two grub screws positioned 90° apart lock the sprocket against both rotational slip and axial movement. The first screw seats over the key, pulling the sprocket hub tight against the key faces. The second screw at 90° generates a radial clamping force against the shaft surface, preventing the sprocket from moving axially along the shaft under chain tension variation. Single-setscrew designs are adequate only for light, non-reversing drives with constant chain tension.

BS 4235 Keyway — Interchangeable with Standard Keys

The keyway is machined to BS 4235 Part 1 dimensions — the same standard used for keyways in British and European shafts and hubs. Standard parallel keys from any engineering supplier will fit without modification. The keyway depth and width tolerances are machined to P9 (hub side) and N9 or Js9 (shaft side) as appropriate for a normal keyed drive, ensuring the key seats correctly in both the shaft and the sprocket hub without a loose or binding fit.

C45 Steel — Hardened Tooth Flanks

The same C45 alloy and induction tooth hardening used in our stock bore range — 52–58 HRC at the tooth flank, with a tough unhardened core through the hub. The machining of the finished bore is carried out before tooth hardening in the processing sequence, ensuring that the heat cycle does not distort the bore or keyway. Bore and keyway are measured after full processing to confirm dimensional compliance.

Matching Chain — European DIN 8187

Every finished bore sprocket in this range is designed to run with European standard roller chain to DIN 8187 / ISO R606 — the same chain series used across European industrial, agricultural and process equipment. Running ANSI or JIS chain on a DIN 8187 sprocket causes poor tooth engagement and rapid wear. Always confirm the chain standard on your equipment before ordering.

Duplex and Triplex Hub Availability

Finished bore hubs are stocked in duplex (-2) and triplex (-3) configurations for 08B through 16B in the most commonly ordered tooth counts. For duplex or triplex finished bore sprockets in 06B or 20B, or in non-catalogue tooth counts, contact us with your specification — manufacturing lead time is 10–15 working days from confirmed order.

Подходяща верига и свързани продукти

European standard roller chain DIN 8187 ISO R606 for finished bore sprockets 06B 08B 10B 12B 16B 20B

Съответстваща задвижваща верига — европейски DIN 8187

Pair your finished bore sprocket with precision roller chain in European DIN 8187 / ISO R606 — the correct chain standard for all sprockets in this range. Available in simplex, duplex and triplex; standard, stainless steel, self-lubricating and heavy-duty H-series variants.

View Matching Chain →

Задвижващи вериги Korea Ever-Power серия A и B

Задвижващи вериги

Прецизни ролкови вериги с къса стъпка от серия A и B за предаване на мощност. Стъпка от 9,525 мм до 76,2 мм, симплексни до триплексни.

Вижте задвижващите вериги

Вериги за листове и повдигащи вериги Korea Ever-Power

Листни вериги

Подемни вериги серия BL и LH за мачти на мотокари и промишлени повдигателни механизми. Разрушаващо натоварване от 11 kN до 1600+ kN.

Вижте веригите от листа

Вериги от неръждаема стомана Korea Ever-Power за хранително-вкусовата и фармацевтичната промишленост

Вериги от неръждаема стомана

Ролкови вериги SUS304 и SUS316L за хранително-вкусова, фармацевтична и химическа промишленост, предназначени за измиване.

Вижте вериги SS

Инженерни вериги Korea Ever-Power за тежката промишленост

Инженерни вериги

Заварени стоманени, ляти и ковани вериги за транспортиране на тежки товари в цимент, стомана, минно дело и химически заводи.

Преглед на инженерните вериги

Често задавани въпроси

Често задавани въпроси

My shaft diameter is 22 mm — which bore do I order?
Order a sprocket with the 22 mm finished bore. The H7 tolerance on a 22 mm bore is +0/+21 µm — the bore will be between 22.000 mm and 22.021 mm. This gives a sliding clearance fit on a shaft machined to h6 tolerance (22.000 to 21.987 mm). If your shaft is machined to k6 (a light interference fit class), the sprocket will be slightly tighter to assemble but will still go on with moderate hand pressure and a rubber mallet. If your shaft is oversize (worn or incorrectly machined to over 22.021 mm), the sprocket will not fit — measure the shaft accurately before ordering.
Can I rebore a finished bore sprocket to a larger diameter?
Yes, within limits. The bore can be enlarged up to the maximum bore shown in the specification table for that tooth count and chain size — this is the largest bore that still leaves adequate hub wall thickness for the grub screw thread and structural integrity. Do not exceed the maximum bore value in the table. Note that the existing keyway will need to be remachined or a new keyway cut if the bore is enlarged, since the keyway depth is proportional to the bore diameter to BS 4235. It is usually more economical to order the correct bore from us than to re-machine a standard bore sprocket.
What key size should I use with my finished bore sprocket?
The keyway in every finished bore sprocket is machined to the BS 4235 key size for the bore diameter. The key width and depth are determined by the shaft/bore diameter range: for example, a 20 mm bore uses a 6×6 mm key, a 28 mm bore uses an 8×7 mm key, and a 45 mm bore uses a 14×9 mm key. The exact keyway dimensions for each bore are shown in the specification table above. Use a standard parallel key of the correct width — not a Woodruff (semicircular) key, which is not compatible with this keyway profile.
Are duplex and triplex finished bore sprockets available?
Yes. Duplex (-2) and triplex (-3) finished bore sprockets are stocked for 08B through 16B in the most common tooth counts (13T, 17T, 19T, 25T). For 06B and 20B duplex/triplex, and for non-catalogue tooth counts in all sizes, contact us with your specification. Lead time for non-stocked duplex and triplex finished bore sprockets is 10–15 working days. The bore range for duplex and triplex hubs is the same as simplex for the equivalent chain size and tooth count.
What is the minimum quantity and lead time for finished bore sprockets?
For stocked sizes (06B–16B, common tooth counts, bore sizes in catalogue range), there is no minimum order — single sprockets can be ordered and dispatched within 2–5 working days. For non-stocked sizes — 20B finished bore, non-catalogue tooth counts, duplex/triplex in 06B or 20B — minimum order is typically 5 pieces with a 10–15 working day lead time. Larger OEM production batches with dimensional inspection reports and material certificates are available — contact us with your annual volume for pricing.

Какво казват нашите клиенти

★★★★★

"We maintain 34 conveyors across two sites. Previously we kept 20B and 16B stock bore blanks and had them bored each time — 2 to 3 days waiting for machining. With Korea Ever-Power finished bore sprockets in the sizes we use, the lathe step is gone completely. We can now replace a drive sprocket between shifts."

K.B., Maintenance Supervisor
United Kingdom – Aggregate & Quarrying

★★★★★

"We build 80 to 100 packaging machines per year, all using 08B-1 chain on 25 mm shafts. Korea Ever-Power finished bore sprockets in the 08B-1 25 mm bore arrive ready to press on. We ordered a year's stock of the four tooth counts we use — the consistency is excellent and the bore tolerance is correct every time."

F.V., Production Engineer
Netherlands – Packaging Machinery OEM

★★★★★

"We service combine harvesters across the harvest season. The 10B-1 and 12B-1 finished bore sprockets in 25 and 30 mm bore cover the majority of what we need in the field. No machining van on site — just a hex key, a mallet and 20 minutes per sprocket. Korea Ever-Power dispatches orders the same day for stock sizes."

L.M., Agricultural Service Manager
Australia – Agricultural Machinery Service

Order Finished Bore European Standard Sprockets

Specify the chain size (e.g. 08B-1), tooth count and bore diameter in mm. Duplex and triplex available for most sizes. Quantities from 1 piece. Our team responds within one working day.

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