Shop All
- Shop By
- New Products
- Hot Sellers
- West Marine Brand Store
- Quick Order
- Gift Cards
- Special Deals
- Products on Sale
- Clearance
- Rebate Offers
- Sweepstakes & Contests
- PLUS Product Protection Plan
- West Selectors
- Engine Part Selectors
- Boat Cover Fit Guide
- Bimini Top Fit Guide
- Custom Boat Graphics
- eCatalogs & Flyers
- Annual eCatalog
- Request Annual Catalog
- View All eCatalogs
Men's
- Outerwear
- Casual Jackets
- Fleece
- Layering Garments
- Sweaters
- Sweatshirts
- Foul Weather Gear
- Coastal
- Dinghy
- Inshore
- Ocean
- Offshore
- Casual Apparel
- Boardshorts & Swimwear
- Knit Shirts
- Pants
- Shorts
- T-Shirts
- Woven Shirts
- Accessories
- Belts
- Hats
- Sailing Gloves
- Seabags & Dry Bags
- Sunglasses
- Watches & Timers
- Shoes
- Athletic Shoes
- Boat Shoes
- Boots
- Canvas Shoes
- Sandals & Watersocks
- Socks & Shoe Care
- View All Men's
- Brands
- COLUMBIA
- COSTA
- GILL
- GRUNDENS
- GUY HARVEY
- HENRI LLOYD
- HOOK & TACKLE
- NAUTICA
- OLD HARBOR OUTFITTERS
- O'NEILL
- PELAGIC
- QUIKSILVER
- SLAM
- SPERRY TOP-SIDER
- TOMMY BAHAMA
- WEEKENDER
- WEST MARINE
- ZHIK
Women's
- Outerwear
- Casual Jackets
- Fleece
- Layering Garments
- Performance Jackets
- Sweaters
- Sweatshirts
- Foul Weather Gear
- Coastal
- Dinghy
- Inshore
- Offshore/Ocean
- Casual Apparel
- Capris
- Dresses & Skirts
- Knit Shirts
- Pants
- Shorts
- Swimwear
- T-Shirts
- Woven Shirts
- Accessories
- Hats
- Sailing Gloves
- Seabags & Drybags
- Sunglasses
- Watches & Timers
- Shoes
- Athletic Shoes
- Boat Shoes
- Boots
- Canvas Shoes
- Sandals
- Socks & Shoe Care
- View All Women's
- Brands
- COLUMBIA
- GILL
- GUY HARVEY
- HELLY HANSEN
- HENRI LLOYD
- LIFE IS GOOD
- LOLE
- O'NEILL
- PRANA
- SALT LIFE
- SPERRY TOP-SIDER
- TOMMY BAHAMA
- WEST MARINE
Electronics
- Fishfinders
- Fishfinder & GPS Combos
- Dedictated Fishfinders
- Transducers
- Accessories
- Boat Instruments
- Wind Instruments
- Depth Instruments
- Instrument Systems
- Knot Meter & Log Instruments
- Instrument Accessories
- Electronics Mounts
- GPS
- Marine Handheld GPS
- Outdoor GPS
- See All GPS
- Audio Entertainment
- Stereo Packages
- Stereo Head Units
- Marine Speakers
- Audio Amplifiers
- Audio Accessories
- Video Products
- Marine Communications
- Handheld VHF Radios
- Fixed Mount VHF Radios
- VHF Antennas
- Satellite Communications
- Communication Accessories
- See All VHF
- Autopilots
- Cockpit Pilots
- Below Deck Pilots
- Accessories
- Beacons
- EPIRBs
- PLBs
- Satellite Messengers
- View All Electronics
- Brands
- ACR ELECTRONICS
- B & G
- CLARION MARINE AUDIO
- FUSION
- GARMIN
- HUMMINBIRD
- ICOM
- INTELLIAN
- JL AUDIO
- KENWOOD
- KVH INDUSTRIES
- LOWRANCE
- MCMURDO
- RAYMARINE
- SHAKESPEARE
- SIMRAD
- SONY
- STANDARD HORIZON
- TACKTICK
- UNIDEN
- WEST MARINE
Boats & Motors
- Inflatable Boats
- Shop All Inflatable Boats
- Slat Floor
- Segmented Floor
- Inflatable Air Floor
- RIBs
- Hypalon Fabric Boats
- PVC Fabric Boats
- Davits, Lifts & Wheels
- Accessories
- Replacement Parts
- Outboard Motors
- Electric
- Gas
- Propane
- Trolling Motors
- Kayaks
- Inflatable
- Rotomold
- Sit-Inside
- Sit-On-Top
- Accessories
- Shop All Kayaks
- More
- Canoes
- Car Top Systems
- Fishing Floats
- Oars
- Paddles
- Rigid Dinghies
- Stand-Up Paddleboards
- Engine Systems
- Anodes
- Engine Parts Selector
- Fuel Additives
- Hydraulic Steering
- Hyrdrofoils
- Mechanical Steering
- Motor Mounts
- Oil Change Pumps
- Trim Tabs
- Two-Stroke Oil
- View All Boats, Motors & Kayaks
- Brands
- CONFLUENCE
- JIMMY STYKS
- LEHR
- MALIBU KAYAKS
- MERCURY
- OCEAN KAYAK
- SEATTLE SPORTS
- TELEFLEX
- TORQEEDO
- WALKER BAY
- WEST MARINE
- YAKIMA
Shoes
- Men's
- Athletic Shoes
- Boat Shoes
- Boots
- Canvas Shoes
- Sandals & Watersocks
- Socks & Shoe Care
- Women's
- Athletic Shoes
- Boat Shoes
- Boots
- Canvas Shoes
- Sandals
- Socks & Shoe Care
- View All Shoes
- Brands
- COLUMBIA
- HELLY HANSEN
- KEEN
- OCEAN MINDED
- O'NEILL
- SEBAGO
- SPERRY TOP-SIDER
- TEVA
- WEST MARINE
Maintenance
- Paint & Solvents
- Barrier Coats
- Bottom Paint
- Paint Removers
- Painting Supplies
- Primers & Undercoats
- Specialty & Nonskid Paints
- Thinners & Solvents
- Topside Paint
- Cleaners & Protectants
- Bilge Cleaners
- Boat Soap
- Fabric & Vinyl Products
- Lubes & Metal Protectants
- Metal Polishes
- Non-Marine & Auto Cleaners
- Specialty Cleaners
- Wash & Wax Products
- Resin & Fiberglass
- Adhesives
- Epoxy Resin
- Fiberglass & Fillers
- Fiberglass Cloth & Mat
- Gelcoat Repair Kits
- Polyester Resin
- Putties & Sealers
- Resin Pumps & Accessories
- Winterizing & Storage
- Antifreeze
- Boat Stands
- Winter Covers
- More Maintenance...
- Anodes
- Boat Graphics & Lettering
- Building Materials
- Caulking & Sealants
- Fiberglass Polishes & Waxes
- Hoses & Cleaning Tools
- Tools
- Wood Finishes
- View All Maintenance
- Brands
- 3M
- AWLGRIP
- EPIFANES
- EVERCOAT
- INTERLUX
- KLEAN STRIP
- MARTYR ANODES
- MAS EPOXY
- MEGUIARS
- PETTIT PAINTS
- RUSTOLEUM
- STAR BRITE
- WEST MARINE
- WEST SYSTEM
- Z SPAR
Sailing
- Sailboat Hardware
- Blocks
- Cleats & Stoppers
- Downwind Poles & Cars
- Headsail Furling
- Mast & Standing Rigging
- Sailboat Steering
- Sailing Instruments
- Sailing Winches
- Sailmaking & Splicing
- Shackles, Snaps & Fittings
- Travelers, Tracks & Vangs
- View All Sailboat Hardware
- Running Rigging
- Dyneema & Spectra
- Polyester
- Technora & Kevlar
- Vectran
- Sailing Services
- ONE DESIGN
- West Marine Rigging Service
- Brands
- ANDERSEN
- ANTAL
- BAINBRIDGE
- FACNOR
- FORESPAR
- FSE ROBLINE
- HARKEN
- HAYN
- HOLT
- KARVER
- LEWMAR
- MCLUBE
- NEW ENGLAND ROPES
- RONSTAN
- SAMSON
- SCHAEFER
- SPINLOCK
- WICHARD
- ZHIK
Cruising
- Anchor & Docking
- Anchors
- Chain & Shackles
- Dock & Mooring Lines
- Docks & Accessories
- Fenders, Covers & Hangers
- Ladders & Boat Hooks
- Windlasses, Rollers & Thrusters
- Boats & Outboards
- Inflatable Boats
- Outboard Engines
- Rigid Dinghies
- Electronics
- Audio Entertainment
- Autopilots
- Beacons & Surveillance Cameras
- GPS, Radar & Weather
- Marine Communications
- Weather & Shortwave Radios
- Electrical
- Shorepower
- Batteries & Accessories
- Navigation
- Binoculars & Night Vision
- Charts, Almanacs & Tide Tables
- Compasses & Navigation Tools
- Cruising Guides
- Marine Software
- Sailboat Hardware
- Blocks
- Cleats & Stoppers
- View All Sailboat Hardware
- Ventilation
- Air Conditioning & Cooling
- Heaters & Dehumidifiers
- Galley
- Appliances
- Barbecues
- Cookware
- Refrigeration
- Tableware
Fishing
- Reels
- Baitcasting Reels
- Conventional Reels
- Spinning Reels
- Rod & Reel Combos
- Rods
- Baitcasting Rods
- Conventional Rods
- Spinning Rods
- Rod & Reel Combos
- Fishfinders
- Dedicated Fishfinders
- Fishfinder & GPS Combos
- Trolling Motors
- Bow Mount
- Transom Mount
- Fishing Accessories
- Bait Tanks & Pumps
- Coolers
- Downriggers
- Fillet & Bait Tables
- Nets, Tools, Gaffs & More
- Outriggers
- Rod Holders & Racks
- Tackle Boxes
- View All Fishing
- Brands
- AVET
- BERKLEY
- BLACKTIP
- CALCUTTA
- CANNON
- DAIWA
- MINN KOTA
- MOTORGUIDE
- PENN
- SHAKESPEARE
- SHIMANO

RONSTAN
Series 25 Lightweight Blocks

From $10.49

Earn up to 4% back on this purchase! Learn More

Description	WM Model#	MFG Part#	Availability	Price USD	QTY
Single Lightweight Block, 660lb. SWL, 0.5oz.	148775	RF571	In Stock	$10.49
Single, Upset Swivel, Lightweight Block, 330lb. SWL, 0.7oz.	538678	RF573	In Stock	$15.99

+ Add to Cart

Add to My List

Description

Specs

The West Advisor

Reviews

Stainless-steel blocks with Acetal sheaves for reduced weight. Slightly flared cheeks provide fair leads on dinghy control lines.

Sheave: UV stabilized Acetal
Ball Bearings: Plain bearings
Sheave Size: 1" (25mm)
Line Dia.: 1/4" max.
Cheek Material/Finish: Polished 316 Stainless
Shackle/Strap Type: Swivel shackle or loop top

Product Specs

The West Advisor

The West Advisor articles have answered boaters' questions and provided solutions to boating problems for more than 20 years. West Marine has compiled one of the Web's most comprehensive collections of technical boating information articles.

P002_061_005_511

Find A Store Near You

Shop By

Special Deals

West Selectors

eCatalogs & Flyers

Outerwear

Foul Weather Gear

Casual Apparel

Accessories

Shoes

Brands

Outerwear

Foul Weather Gear

Casual Apparel

Accessories

Shoes

Brands

Network

Fishfinders

Boat Instruments

GPS

Audio Entertainment

Marine Communications

Autopilots

Beacons

Brands

Inflatable Boats

Outboard Motors

Kayaks

More

Engine Systems

Brands

Men's

Women's

Brands

Paint & Solvents

Cleaners & Protectants

Resin & Fiberglass

Winterizing & Storage

More Maintenance...

Brands

Sailboat Hardware

Safety

Running Rigging

Sailing Services

Brands

Anchor & Docking

Boats & Outboards

Electronics

Electrical

Navigation

Sailboat Hardware

Safety

Ventilation

Galley

Reels

Rods

Fishfinders

Trolling Motors

Fishing Accessories

Brands

RONSTANSeries 25 Lightweight Blocks

Product Specs

The West Advisor

RONSTAN
Series 25 Lightweight Blocks