51300 Series Thrust Ball Bearings are thrust bearings manufactured to ISO 104 / DIN 711 / GB/T 301. This page carries the complete boundary-dimension table — bore, outer diameter, width and corner radius for every designation in the series — with the materials, mounting and selection notes that go with it.
What Are 51300 Series Thrust Ball Bearings?
51300 Series Thrust Ball Bearings are thrust bearings defined by ISO 104 / DIN 711 / GB/T 301. They are selected by bearing designation and the dimensional characteristics shown below. Material, cage and sealing are specified separately from the designation and are covered further down this page.
Materials & Cage
Washers and rolling elements are through-hardened GCr15 / 100Cr6. Cages are pressed steel or machined brass. The shaft washer and housing washer are not interchangeable and are not the same part; state which face seats against the rotating member.
Typical Applications
Vertical shafts, crane hooks, turntables, jacks and machine tool feed screws — pure axial load, with the radial load carried by another bearing. Read the full application guide for 51300 Series Thrust Ball Bearings →
Pricing
51300 Series Thrust Ball Bearings are supplied to order. Pricing starts from approximately US$5.00 per piece for standard bore sizes in bearing steel, single direction; final pricing depends on size, material, finish and order quantity (MOQ applies). Submit your exact configuration with the quote form above.
Specifying the 51300 Series Thrust Ball Bearings
If the shaft is already fixed, go straight to the size: 75 mm bore, 80 mm bore, 85 mm bore and 90 mm bore. Each of those pages repeats only the row that matters for that bore, with the fit and clearance notes underneath it.
Where the environment decides the specification rather than the load, the material pages are the ones to read: Pressed Steel Cage, Polyamide Cage and Machined Brass Cage. Each states what the grade survives, and what choosing it costs in load capacity or temperature range.
The dimensions above are fixed by DIN 711 and GB/T 301 — that is what makes one maker's bearing interchangeable with another's, and it is worth checking which standard a quotation is written to. For the machines and duties this type is actually specified for, see where 51300 series thrust ball bearings are fitted.
Manufactured in our own plant
This bearing is forged, hardened, ground, superfinished and clearance-set in-house. The stages below are where its tolerance class, its internal clearance and its noise grade are actually decided.
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01 Forging & turning
GCr15 bar and tube is cut, heated and forged into ring blanks, then turned to leave a uniform grinding allowance. Forging rather than machining from solid keeps the grain flow following the raceway, which is the surface that eventually fails.
Blank dimensions and grinding stock checked at set-up and per shift.
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02 Heat treatment
Through-hardening brings GCr15 / 100Cr6 to 58–64 HRC; carburizing case-hardens 20CrMnTi where the section is heavy or the load is shock. Rings are then stabilized so they hold size in service rather than growing in the housing.
Core and surface hardness per lot; retained austenite and dimensional stability to the ordered temperature class.
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03 Raceway grinding
Faces, bore, outer diameter and raceway are ground in sequence on separate machines. This is where the tolerance class is created: P0, P6, P5 or P4 is a grinding outcome, not a sorting outcome.
Bore and outer diameter deviation, raceway roundness and face runout measured to ISO 492 on every setup.
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04 Honing & superfinishing
The ground raceway is honed to remove the grinding lay and bring surface roughness down to a fraction of a micrometre. Raceway finish is what decides whether a lubricant film forms, and therefore what decides bearing life far more than the load rating alone.
Surface roughness Ra and waviness measured per lot.