OTT®
Factory-Direct OEM Equivalent

Fastech Go-Kart
Bearing Replacement

OTT manufactures the bearings used in Fastech kart chassis — axle seat bearings, steering column bearings, rod ends, and uniballs — to the same ISO dimensional standard. Buy factory-direct and eliminate the distributor markup.

All OTT bearings are dimensionally interchangeable with the ISO standard bearings in Fastech hardware. No modification required.

Request PricingView Cross-Reference Table
9
Models Cross-Referenced
IATF
16949 Certified Factory
P6
Precision Grade Standard
1,000
pcs MOQ Per Model

Why Buy Factory-Direct Instead of Fastech OEM?

Fastech-branded kart bearings sold through the parts catalog go through at least one distributor layer before reaching you. OTT is the type of manufacturer behind those bearings — an in-house factory with its own production line, heat treatment, and grinding. Buying from OTT means eliminating the middleman while sourcing from a certified manufacturer with tighter traceability.

Because all kart bearings follow ISO dimensional standards (6010, 6905, 6205, etc.), every OTT bearing is a drop-in replacement. There are no proprietary dimensions in Fastech's bearing catalog — only standard ISO part numbers, which OTT manufactures to P6 precision with GCr15 bearing steel.

For distributors, this means a direct OEM supply chain at competitive factory pricing. For kart builders and racing teams, it means access to upgrade options — including ceramic hybrid variants — that aren't typically available through the standard parts catalog.

Same ISO dimensions — direct drop-in fit, no modification
IATF 16949 certified — same standard as automotive OEMs
Ceramic hybrid option for rear axle (performance upgrade)
Factory-direct pricing — distributor markup eliminated
OEM branding available for kart parts distributors
In-stock inventory — standard models ship within days

OTTOTT Factory-Direct

  • In-house manufacturing — full process control
  • IATF 16949 + ISO 14001 + ISO 45001
  • Factory pricing — no distributor layer
  • Ceramic hybrid upgrade available
  • Custom branding / OEM packaging available
  • MOQ 1,000 pcs / model

OEMFastech OEM Parts Channel

  • Sourced from bearing manufacturers (no in-house mfg)
  • Distributor markup on standard ISO bearings
  • No ceramic upgrade option in standard catalog
  • No custom branding for resellers

Fastech Kart Bearing Cross-Reference

All bearings in Fastech kart hardware follow ISO dimensional standards. OTT manufactures all of them factory-direct.

ApplicationBearing SizeOTT PartDetail
Rear axle seat (standard)50×80×16 mm6010 ZZ / 2RS / OpenView →
Rear axle seat (ceramic hybrid)50×80×16 mm6010 Ceramic HybridView →
Rear axle seat (wide)50×90×20 mm6210 ZZ / 2RSView →
Steering column25×42×9 mm6905 ZZ / 2RSView →
Steering column (deep seat)25×42×12 mm6905-12 ZZ / 2RSView →
Front wheel hub25×52×15 mm6205 Open / ZZ / 2RSView →
Front spindle17×35×10 mm6003 ZZ / 2RSView →
Tie rod endM8 male threadCOS8View →
Steering shaft uniball8 mm borePB8View →

* All bearings follow ISO 15:2017 dimensional standards. OTT bearings are dimensionally identical to Fastech OEM bearings of the same model designation.

OTT Products for Fastech Chassis

Factory-direct, IATF 16949 certified, in-stock. All models available in multiple seal configurations.

6003 Front Spindle Bearing

6003 Front Spindle Bearing

d 17 mmD 35 mmB 10 mm
Details →
6905 Steering Column Bearing

6905 Steering Column Bearing

d 25 mmD 42 mmB 9 mm
Details →
6905-2RS Sealed Kart Bearing

6905-2RS Sealed Kart Bearing

d 25 mmD 42 mmB 9 mm
Details →
PB8 Uniball Bearing — Steering Shaft

PB8 Uniball Bearing — Steering Shaft

Bore 8 mm
Details →
COS8 Rod End Bearing — Tie Rod

COS8 Rod End Bearing — Tie Rod

Details →
6010 Rear Axle Bearing 50×80×16 mm

6010 Rear Axle Bearing 50×80×16 mm

d 50 mmD 80 mmB 16 mm
Details →
6010 Ceramic Hybrid Axle Bearing 50×80×16 mm

6010 Ceramic Hybrid Axle Bearing 50×80×16 mm

d 50 mmD 80 mmB 16 mm
Details →
6210 Rear Axle Bearing 50×90×20 mm

6210 Rear Axle Bearing 50×90×20 mm

d 50 mmD 90 mmB 20 mm
Details →
View Full Go-Kart Bearing Catalog
Performance Upgrade

Ceramic Hybrid Axle Bearing — A Competitive Advantage

The standard Fastech axle bearing (50×80×16 mm / 6010) is a steel deep groove ball bearing. OTT offers the same bearing with silicon nitride (Si₃N₄) ceramic balls — a drop-in replacement that measurably reduces rear axle friction.

  • Si₃N₄ ceramic balls: 60% lighter than steel, harder, lower friction coefficient
  • Less heat generated at high axle RPM — longer grease life
  • Direct 50×80×16 drop-in — no housing modification
  • Bulk pricing available for racing teams and distributors
View Ceramic Hybrid 6010
OTT Ceramic Hybrid 6010 Axle Bearing for Fastech Kart

Frequently Asked Questions

Are OTT bearings compatible with Fastech go-kart chassis?
Yes. OTT manufactures bearings to ISO dimensional standards, which means they are dimensionally identical to the bearings used in Fastech kart chassis. The 6010 (50×80×16 mm) axle bearing, 6905 steering column bearing, 6003 and 6205 wheel bearings, and COS8/PB8 steering bearings all fit Fastech hardware without modification.
What size is the rear axle bearing in a Fastech go-kart?
The standard Fastech rear axle seat bearing is 50×80×16 mm, ISO designation 6010. OTT manufactures the 6010 in open, ZZ (shielded), and 2RS (sealed) configurations, as well as a ceramic hybrid version with Si₃N₄ balls for competitive racing applications.
How does OTT bearing quality compare to Fastech OEM bearings?
OTT bearings are manufactured in-house with IATF 16949 certification — the same quality standard required by global automakers. All bearings use high-purity GCr15 (AISI 52100) bearing steel with P6 precision grinding. Fastech-branded bearings sold through their parts catalog are sourced from bearing manufacturers; OTT is that type of manufacturer. Buying factory-direct eliminates the distributor markup while maintaining equivalent or superior quality.
What is the minimum order for OTT Fastech-compatible kart bearings?
OTT supplies bearings with a minimum order quantity of 1,000 pieces per model. This is suitable for kart parts distributors, chassis builders, and large karting facilities. Samples are available for evaluation before placing bulk orders.
Can I upgrade Fastech kart axle bearings to ceramic hybrids?
Yes. OTT offers the 6010 axle bearing in a ceramic hybrid version with silicon nitride (Si₃N₄) balls — a direct drop-in replacement for the standard 6010 steel bearing. Ceramic balls have lower mass, higher hardness, and reduced friction compared to steel, producing measurably less drag at the rear axle. This is a common performance upgrade for competitive sprint and endurance kart racing.
Does OTT offer private label or OEM branding for Fastech-compatible bearings?
Yes. OTT provides OEM branding via laser engraving and custom packaging for distributors who want to sell under their own brand. Several European kart parts distributors currently sell OTT-manufactured bearings under their own labels. MOQ for branded bearings is the same 1,000 pcs per model.

Related Pages

Go-Kart Bearing Overview

All OTT kart bearings — wheels, axles, steering, engine accessories

6010 Axle Bearing 50×80mm

Standard Fastech axle seat bearing — open, ZZ, 2RS

Full Kart Bearing Catalog

All 14 models — wheels, axles, steering, rod ends, uniballs

Source Fastech-Compatible Bearings Factory Direct

OTT manufactures all bearings used in Fastech kart chassis at factory-direct pricing. IATF 16949 certified, in stock, ceramic hybrid available. MOQ 1,000 pcs per model.

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MOQ: 1,000 pcs per model. Reply within 12 hours including weekends.

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