Bearing & Seal Adapters Manufacturing
Bearing spacers, distance sleeves, seal housings and adjusting collars: 15 families, 139 types. h7/h8 tolerance, ⌀6.4–20 mm, steel/stainless/brass.
Part Families
Bearing Spacer Ring
Plain cylindrical spacer ring providing axial distance between two bearings.
⌀8–20 · L 4–12 mm
10 types
Spacer Ring
Long cylindrical spacer ring setting axial clearance on a shaft.
⌀9–20 · L 15–60 mm
10 types
Stepped Spacer Ring
Stepped spacer with two diameters seating inner and outer bearing races separately.
⌀12–20 · L 11–30 mm
9 types
Inner Race Adapter
Adapter ring with tapered transition fitting a small shaft to a larger bearing inner race.
⌀10–20 · L 15–35 mm
9 types
Adjusting Collar
Adjusting collar fixed to the shaft via a set screw in a radial threaded hole.
⌀12–20 · L 8–20 mm
10 types
Knurled Adjusting Collar
Adjusting collar with a knurled outer surface for hand adjustment, fixed on the shaft.
⌀12–20 · L 10–18 mm
10 types
Hex Distance Spacer
Hex-bodied distance spacer with wrench flats and an internal thread or bore.
⌀6.4–19.6 · L 8–35 mm
11 types
Threaded Spacer Bushing
Threaded spacer bushing with an external thread at one end and a shoulder at the other.
⌀9–18 · L 13–38 mm
10 types
Bearing Sleeve
Stepped thin-wall sleeve locating the bearing outer race.
⌀12–20 · L 12–27 mm
10 types
Seal Housing Sleeve
Shouldered sleeve housing a radial shaft seal in its bore.
⌀15–20 · L 11–18 mm
9 types
Sealing Ring
Short-wall sealing ring with an O-ring groove.
⌀12–20 · L 8–12 mm
8 types
Spacer Sleeve
Plain-wall spacer sleeve setting distance between two bearings.
⌀10–20 · L 10–32 mm
9 types
Reducing Sleeve
Stepped reducing sleeve adapting a shaft to a larger bore.
⌀14–20 · L 16–30 mm
8 types
Threaded Seal Sleeve
Externally threaded seal-retaining sleeve screwed into a housing.
⌀14–20 · L 16–26 mm
8 types
Knurled Press Sleeve
Retaining sleeve with knurled outer surface for press fit into a bore.
⌀12–20 · L 11–29 mm
8 types
Enter ⌀ and L to list matching variants with code and tolerance.
Search this category by sizeBearing and seal adapters are precision turned parts that axially position bearings on a shaft–housing assembly, seat inner and outer races, and hold the radial shaft seal. They are used in gearboxes, electric motors, pumps, automation modules and general machinery to set bearing clearance, apply preload and ensure sealing. This category covers 15 families and 139 types in total: bearing spacer rings, plain and stepped spacer rings, inner-race adapters, adjusting and knurled adjusting collars, hex distance spacers, threaded spacer bushings, bearing sleeves, seal housing sleeves, O-ring-grooved sealing rings, spacer and reducing sleeves, plus threaded and knurled seal sleeves. Material options are steel, stainless steel, brass and aluminium. ISO fits such as h7/h8/h9 on mating diameters and H8 on housing bores, chamfers, knurling, M-threads (with DIN 76 thread runout) and O-ring grooves are produced in a single setup. Machining runs on the Goodway SW-20 Swiss lathe across the ⌀6.4–20 mm range. Beyond the 139 catalog types, we manufacture custom sizes from your technical drawing; requests with part code, material and quantity are priced on a quotation basis.
These are short, stout parts: 4–60 mm long, with no variant exceeding L/D 3.8. Rigidity is not the constraint here, repeatability is — 139 variants, machined in one setup, requiring 18× thread turning, 14× hex flat milling, 139× axial bore, 12× taper turning, 18× knurling.
Everything here is held to 9 tolerance classes (-, 6g, H7, H8, h6, h7, h8, h9, js13), and 100% of the variants map to a DIN or ISO standard.
Every part is CNC-turned to your drawing — series, small batches and custom turned parts. Send your drawing (PDF/DWG/STEP) for a quote.
Frequently Asked Questions
Parts are turned from bar stock in a single operation on the Goodway SW-20 Swiss lathe. The bore, outer diameter, chamfer, knurling and any M-thread are machined in the same setup, preserving concentricity and surface quality. Standard fits are h7/h8, housing bores H8; ±0.01 mm is targeted on critical diameters. Dimensions can be optimised to match your bearing or seal catalog.
We machine steel, stainless steel (304/316 grade), brass and aluminium. Steel is used for load-bearing spacers, stainless for corrosion, food or chemical environments, brass for hand-turned knurled collars and seal sleeves, and aluminium where light weight matters. We can select the material together based on the operating environment.
We use ISO shaft tolerance h7 (precise) on bearing fits, h8/h9 on general spacer rings, H8 on seal and housing bores, and 6g/6H on threads. ±0.01 mm is targeted on critical diameters. Tighter tolerances and surface-roughness values for critical seating faces can be specified on your drawing.
Yes. The 139 standard types are a starting point; our core work is custom turned production from a drawing. Just send your PDF/STEP drawing with inner diameter, outer diameter, length, tolerance and material. We manufacture spacer, adjusting, reducing and seal sleeves to your dimensions within the ⌀6.4–20 mm range.
Pricing is quotation-based; there are no fixed numbers on the site because price depends on material, tolerance, quantity and drawing complexity. Send the part code (e.g. RULA-ABL-06) or a drawing with material and quantity, and we reply with a firm quote and estimated lead time. We have manufactured in Düzce, Türkiye since 2009 and serve both domestic and export orders.
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