Except for rollers, Is the 22mm all stainless. Are the ball bearings sealed. I want to use it off shore

The best I can tell they are all stainless except rollers. I can't answer about the bearings but I have used mine on my Hobie 16 for years in a saltwater environment and so far they have performed flawlessly. Hope this helps.

What is the diameter of the mounting holes?

The mounting holes are .20" or 5.17mm

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HARKEN Premium Sailing 22mm Boat Blocks

Product ID: 24933528

Details

Bearing Number
233
Brand
HARKEN
Item Weight
4.54 g
Item dimensions L x W x H
2.5 x 0.94 x
Material
Nylon

⚖️Super lightweight at 4.54g

⚙️22mm ultra-compact size

🛡️UV-stabilized Derlin ball bearings

฿2304

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Description

⛵ Sail smarter, not harder — the micro block that’s making waves!

TRUSTED PERFORMANCE - Backed by a 1-year warranty and a 4.6-star rating from sailing pros worldwide.
FEATHERWEIGHT STRENGTH - Compact 22mm nylon blocks with stainless steel sideplates combine durability with minimal weight.
EFFORTLESS SAILING CONTROL - Low-friction micro blocks ensure smooth, free-running lines for precision handling.
BUILT TO BRAVE THE ELEMENTS - UV-stabilized Derlin bearings with carbon black resist sun damage and corrosion.
VERSATILE MARINE COMPATIBILITY - Perfect for dinghies and lightly-loaded control lines on boats of all sizes.

The HARKEN Premium Sailing 22mm Boat Block is a compact, ultra-lightweight pulley designed for smooth, low-friction line control on dinghies and larger boats. Featuring UV-stabilized Derlin ball bearings and stainless steel sideplates, it offers durable, corrosion-resistant performance. At just 4.54 grams and 22mm diameter, it’s engineered for precision and reliability, backed by a 1-year warranty and top user ratings.

Specifications

ASIN	B002NSQBXM
Bearing Number	233
Bearing Type	Ball Bearing
Best Sellers Rank	#50,138 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #6 in Sailing Hardware
Brand Name	HARKEN
Compatible Lubricant	Grease
Customer Reviews	4.6 4.6 out of 5 stars (54)
Included Components	1 Cheek Block
Item Dimensions	2.5 x 0.94 x 0.5 inches
Item Weight	4.54 g
Manufacturer	HARKEN
Material Type	Nylon
Model	233
Number of Items	1
Outside Diameter	22 millimeters
Part Number	233
Specification Met	Aluminum
UPC	097653008477
Unit Count	1 Count
Warranty Description	1 Year Warranty

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฿2304

Duties & taxes included

In stock

Sold byAmazon ThailandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Thailand.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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Excellent communication throughout the order process. Product is perfect.

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