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Olli™ flex 900 M Ø50

Easysea Olli Flex 50 M modular sailing block in single configuration, front view on white background

Olli Flex 50 M block at 45 degrees showing the anodised aluminium cheeks and the POM sheave

Olli Flex 50 M block with a braided line running through the sheave, front view

Olli Flex modular blocks in use under the boom of a sailboat, sheets running through

Line running through the Olli Flex 50 M block, seen from above along the sheave groove

The two Olli Flex sizes side by side, 50 M and 60 L, on white background

Olli Flex 50 M in double configuration, two sheaves stacked on the same body, front view

Olli Flex 50 M double block at 45 degrees with the stainless shackle head

Olli Flex 50 M in triple configuration, three sheaves on the same body, front view

Olli Flex 50 M triple block at 45 degrees showing the three stacked sheaves

Olli Flex 50 M double block hanging from the twin stainless shackle head

Olli Flex 50 M double block assembled with the stainless shackle, front view

All the parts of the Olli Flex 50 M triple configuration laid out: three cheeks, two sheave spacers, the stainless shackle and the through bolts

Exploded view of the Olli Flex 50 M block: body, openable cheek and stainless shackle

The two openable cheeks of the Olli Flex 50 M, the feature that lets the block be reconfigured

The self-lubricating POM sheave of the Olli Flex 50 M next to the machined aluminium body

The three components of the Olli Flex 50 M laid out: cheek, POM sheave and body

Detail of the sheave axle bolt being fitted into the Olli Flex 50 M body

Olli Flex 50 M single block next to the conversion kit parts, the shackle head and the long through bolt

Two Olli Flex 50 M blocks with the stainless shackle and the two bolts needed to join them

Olli Flex 50 M double block held in one hand next to the shackle head and the through bolt

Olli Flex 50 M double block held by the twin stainless shackle head, showing how compact it is

Fitting the stainless through bolt into the Olli Flex 50 M double block by hand

Assembling the Olli Flex 50 M double block with a hex key and a driver, no special tooling needed

Olli Flex 50 M double block with the hex key, the ratchet, the shackle head and the through bolt used to reconfigure it

Separating the stacked cheeks and sheaves of the Olli Flex 50 M by hand to change configuration

Removing the through bolt from the Olli Flex 50 M triple block with the hex key supplied

Olli Flex 50 M triple block with the hex key and ratchet used to assemble it, front view

Tightening the Olli Flex 50 M triple block with a ratchet, showing the reconfiguration in progress

Technical data of the Olli Flex 50 ST M: 50 mm POM sheave, 12 mm maximum line diameter, AISI 316 omega shackle, 900 kg working load and 226 g weight

Olli™ flex 900 M Ø50

Name: Olli™ flex 900 M Ø50
Brand: easysea
SKU: OF-101
Price: 63.20 EUR
Availability: InStock

€63,20 EUR

€79,00 EUR

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Launch offer · 15% off

SizeØ50 · M

Ø50 · Mlines up to 12 mmØ60 · Llines up to 14 mm

LoadStandard · 900 kg max

Standard900 kg maxHigh Load1700 kg max

En stock

Entrega estimada: mar 10 nov – jue 12 nov

Cantidad:

Transacción segura Vendido por easysea®

Before you order

3-year warranty

Full cover on material and manufacturing defects. No registration needed. With easysea +care you add 3 more years, 6 in total.
30-day returns

If it is not right you send it back, even fitted. Full refund.
Tracked shipping

Tracking on every order. Free shipping over €399 .

Free shipping on orders over€399 · ships in 24 to 72h3-year warranty · secure encrypted checkout

One block with endless uses that replaces a whole drawer of fittings. Reconfigure it from single to double to triple with the Conversion Kit, hanging or mounted on deck.

One block, 6+ uses: turning blocks, tackles, quick rigs

From one to three: reconfigure with the Conversion Kit

Fewer parts, more reliable: self-lubricating, no metal bearings

Marine-grade build: 6061-T6 aluminium · AISI 316

Olli™ flex 900 M Ø50

€63,20 EUR

€79,00 EUR

One block, every job

Olli Flex single block with the line running in the sheave

Hang it and go

On its own, hanging from the included stainless omega shackle: a turning block ready in seconds, wherever you need it. No kit required.

The two openable cheeks of the Olli Flex block

Opens on a loaded line

No need to unreeve the sheet: open the body, drop the line in, close it. Even with the rig in place.

Double: 2:1 tackle

Two identical bodies joined by the kit: a 2:1 tackle for the vang, traveller or barber hauler, using the line you already have.

Triple: maximum purchase

Three bodies, three sheaves, the same kit: maximum purchase for the hardest jobs, always re-configurable.

From one, to three

Two identical blocks and one Conversion Kit make a 2:1 tackle. Three make a triple. It goes together with common hand tools in a few minutes, and comes apart just as easily.

1
Stack the bodies
Line up two or three identical Olli Flex bodies with the sheaves in between.
2
Run the bolt through
The long stainless bolt from the Conversion Kit passes through the whole stack.
3
Tighten and go
Hex key and socket wrench. Fit the shackle head and the block is ready.

All the parts of the Olli Flex Conversion Kit

Everything in one Conversion Kit

One kit covers double, triple and flat deck mounting. You need a single kit per configuration, matching the block size and load class.

See the Conversion Kit Assembly instructions (PDF)

How many do you need?

Single

Flying lead, barber hauler, utility block. Hanging from the shackle, or flat on deck with the kit.

1× Olli™ flex 900 M Ø50

€63,20Add all

Double 2:1

Vang, traveller, adjustment tackles.

2× Olli™ flex 900 M Ø50
1× Olli™ flex Kit de conversión M

€151,20Add all

Triple

Maximum purchase for the highest loads.

3× Olli™ flex 900 M Ø50
1× Olli™ flex Kit de conversión M

€214,40Add all

Each configuration needs just 1 Conversion Kit matching the block size and load class.

Which one is for you?

Size follows your line diameter. Load class follows the job.

Specification	M · Ø50	L · Ø60
Sheave	Ø50 mm · POM	Ø60 mm · POM
Max line	12 mm	14 mm
Working load	900 kg	1.800 kg
Breaking load	1.400 kg	2.700 kg
Omega shackle	6 mm AISI 316	8 mm AISI 316
Weight	226 g	302 g

Figures for the Standard version.

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Standard

POM sheave, grey

Technical self-lubricating POM sheave, light and quiet. For sheets, control lines and everyday running rigging.

900 – 1.800 kg

High Load

6061-T6 sheave, black

Aluminium 6061-T6 sheave and a larger omega shackle: up to twice the rated load on the same line diameter. For racing, primary sheets and halyards.

1.700 – 3.400 kg

Both versions share sheave diameter, max line diameter and mounting, so you can mix them in the same modular setup.

Technical details

Specifications

Taille	M · Ø50
Diamètre du réa	50 mm / 1.97 in
Matériau du réa	POM
Diamètre de bout max	12 mm / 0.47 in
Manille oméga	6 mm · inox AISI 316
Finition	Anodisé soft gris
Épaisseur	28.4 mm / 1.12 in
Charge de travail	900 kg / 1,984 lb
Charge de rupture	1,400 kg / 3,086 lb
Poids	226 g / 8.0 oz

Download the datasheet (PDF)

Warranty & returns

3-year warranty on every easysea® product. 30-day money-back guarantee.

Shipping

Free shipping over €399 . Worldwide express delivery.

FAQ

Can one block really do so many jobs?

Yes. A single Olli Flex covers turning blocks, tackles, quick rigs and temporary installs — 6+ applications. It replaces a drawer of single-purpose fittings.

How do I turn one block into a double or triple?

Add the matching Conversion Kit (sold separately, one per size and load class). It joins identical Olli Flex blocks into double and triple configurations with a few common hand tools.

What’s the difference between Standard and High Load (HL)?

HL versions use a 6061-T6 aluminium sheave instead of POM and a larger shackle, raising the working load on the same line diameter (e.g. 900 to 1,700 kg on Ø50).

Which size do I need?

Ø50 (M) takes up to 12 mm line, Ø60 (L) up to 14 mm. Match the size to your line and the working load to your application.

Does it need maintenance?

Very little. The self-lubricating sheave runs without metal bearings, so there is nothing to seize or corrode — just rinse with fresh water after use.

What makes it “openable”?

The interlocking aluminium bodies rotate against each other, so you can open the block onto a line already under load — handy, but the real advantage is reconfiguring one block into many setups.

Build your system

Standard and High Load blocks, plus the Conversion Kits for deck, double and triple setups.

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