Tools/Maintenance

Precision CNC machined aluminum tool for the installation and removal of 16-notch external bearing bottom brackets. Featuring updated tooth profiles to optimize the fit between the tool and high performance BB parts. Anodized and laser engraved for easy identification and featuring a ratchet/torque wrench compatible 3/8-inch drive. - 16 notch 44mm OD cups - Fits Shimano BB80, BB5700, XT BB70, BB51, and previous external bearing threaded cups - Also fits many external threaded types for Campagnolo, Chris King, FSA MegaExo, Hope, SRAM/Truvativ GXP, Race Face X-type, Surly, Wheels, Fulcrum, and others - Fits 16 notch rotor disc lockrings

A clean bike is a happy bike! Park Tool's Bike Cleaning Brush Kit is a four-piece brush set designed specifically to clean bicycles. Ergonomically designed and featuring dual-density, sure-grip handles, the BCB-4.2 kit includes: • 1 GSC-1 Gear Clean Brush • 1 Tapered Detail Brush • 1 Frame Cleaning Sponge/Bristle Brush • 1 Soft Bristle Soaping Brush

Bio ChainBrite Bicycle Chain and Component Cleaning Fluid is a 100% biodegradable, natural, plant-based degreaser formulated for use in Park's CM-5.2 Cyclone Chain Scrubber or as a general purpose degreaser. It won't harm alloy, plastic, or rubber parts. Use CB-4 full strength, do not dilute with water. Cover parts in solvent and scrub using a brush. 16-ounce bottle

Precision CNC machined aluminum tool for the installation and removal of 12-notch external bearing bottom brackets. Anodized for easy identification and featuring a ratchet/torque wrench compatible 3/8" drive. - 46mm 12-notch OD cup - Race Face® Cinch™, Rotor® BSA30, Zipp® Vuma™, Hawk Racing™ BB3086™, and more

The Bottom Bracket Wrench removes and installs Shimano Hollowtech II, Race Face X-type, FSA MegaExo, Campagnolo Ultra-Torque and TruVativ Giga X-pipe bottom brackets. Laser cut for a precise fit, one end of the BBT-9 securely engages the 16 cup notches, while the other end engages the 8 internal splines of the crankarm adjustment cap.

The CC-4 is a drop-in style gauge that measures bicycle chain wear. The laser cut CC-4 accurately measures a long section of chain and strategically comes in contact with the chain in three places, quickly and easily taking the guesswork out of knowing when chain replacement is necessary. A worn chain will cause poor shifting as well as accelerate drivetrain wear. The tool works on any 5 to 12-speed derailleur chain (including SRAM AXS) and is designed to accurately indicate when a chain reaches .5% and .75% wear, the points at which most chain manufacturers suggest replacement.

A professional quality shop chain tool that works on 5-speed to 12-speed Road and Mountain Bike derailleur chains*, including SRAM AXS 12 speed, as well as 1/8-inch and 3/16-inch chains. The CT-3.3 features an adjustable locating shelf so it works on any width chain to remove and install chain rivets. Built to last and easy to use, the CT-3.3 features a comfortable handle, investment cast steel body and replaceable driving pin (#CTP). *The CT-3.3 will install, but not peen, Campagnolo 11 and 12-speed chain rivets. - Comfortable T-handle - Replaceable driving pin (CTP) - Investment cast steel body - Adjustable locating shelf

Park's FR-5G Cassette Lockring Tool fits most cassette lockrings from Shimano, SRAM, SunTour and SunRace. Made from heat-treated tool steel, the FR-5G features an extra-long splined body to prevent slippage and a guide pin to ensure the tool is in straight, preventing stripped lockrings. And, it can also be used to remove and install Shimano disc brake rotors. The FR-5G requires the use a chainwhip tool to prevent the cassette from turning during lockring removal.

Park's Chainring Nut Wrench makes chainring bolt installation and removal easy. It securely holds the slotted nut to prevent spinning when tightening or loosening the bolt. And, it's double-ended to fit most slotted-type nuts, including Campagnolo chainring bolt nuts.

Park's Crank Puller is for removing crankarms on Shimano's splined, oversize, pipe-billet bottom brackets. It employs a long handle and a fine thread for the leverage and torque needed to remove tight arms. Park's unique rotating tip ensures smooth operation and long life. (The CCP-44 does not fit standard square or tapered bottom brackets.)

A favorite of shop mechanics for over 30 year's, Park's CCP-22 Crank Puller removes crankarms that feature square tapers, and those that fit on Power Drive and Power Spline bottom bracket interfaces. The long, comfortable, built-in handle and fine thread provide the leverage needed to remove even the tightest crankarms. And, there's a rotating tip to ensure smooth operation and long life.

Now you can easily tackle any crank bolt with Park's Crank Wrench. It features a dual-sided head with a 14mm socket and 8mm Allen wrench on a long, vinyl-coated handle so you're sure to have the leverage necessary for the job.

The use of cutting oil or fluid is extremely important when performing any cutting, tapping, facing or reaming operation and Park's Cutting Fluid is a high quality, environmentally safe cutting fluid that extends tool life and makes any frame prep job easier and safer. CF-2 can effectively be used on all metals.

The DT-5.2 is engineered and built to accurately face front or rear disc brake mounts so they are precisely aligned to the rotor. - Faces any IS Mount, Post Mount, or new Shimano Flat Mount, including low clearance, chainstay mounts - Telescoping axle adaptors allow use with any configuration of open or thru-axle dropouts and dropout widths (including Boost 110, Boost 148 and all fat bike axles) - Includes two facing cutters: IS Mounts Post and Flat Mounts - Includes storage case

The DAG-2.2 is an indispensable shop tool that can be used to both measure and straighten misaligned derailleur hangers solving a high percentage of shifting problems. - Gauge bar made of heavy gauge, chrome plated steel - Adjusts to fit 20" to 29"+ wheels - Replaceable threaded tip - Upgraded large inner shaft for added strength* - Tighter tolerances for improved accuracy* - Improved clearance and reach to fit more frame/hanger combos including low clearance thru-axle derailleur hangers* *Compared to DAG-2

Dial Indicator Set bolts directly to the DT-3 allowing for greater accuracy and a way to measure results. Now includes an elongated, cylindrical tip that is large enough to work around voids in most rotors.

What's your seatpost size again? Park's Digital Caliper accurately measures seatposts, head tubes, bearings, spoke diameters, etc. It's a precision instrument built accurate to 0.01mm with a stainless-steel mechanisms and a rugged composite body. The tool’s ability to measure in metric, decimal inch, and fractional inch makes it an indispensable home workshop tool. It features an automatic shut-off and comes with a protective sleeve and the battery.

Park's Double-Ended Cone Wrenches are designed for home mechanics. They're made of thin tool steel to fit the low-clearance adjusting nuts and cone flats on a variety of bearing assemblies. Each wrench is chrome plated for long life and available in popular combinations from 11 to 18mm. Most applications require a pair of cone wrenches. Call or stop by. We can recommend the correct sizes for your needs.

The Park FR-2 Freewheel Remover fits SunTour two-notch freewheels. It's built thin so that removing axle parts is unnecessary. And, it's constructed of durable heat-treated steel. (Not recommended for use with SunTour 4- and 6-notch freewheels.)

The Park FR-6 Freewheel Remover fits most 4-notch BMX and singlespeed freewheels. It can be held with a wrench or vise and its narrow profile allows use without removal of cones and locknuts.

Park's FR-8 Freewheel Remover fits flip-flop BMX hubs with 30 x 1mm threads. It can be held with a wrench or vise, and its narrow profile allows use without removal of cones and locknuts.

Park's Fixed-Gear Lockring Wrench features 2 different radius hooked spanners for a precise fit, and easy removal and tightening of most fixed-gear lockrings. The HCW-17 fits rings with an outside diameter of 41 to 44mm. It also fits BMX cassette hub lockrings with external notches.

Park's Hex Wrench Set offers all the popular Allen wrenches (1.5, 2, 2.5, 3, 4, 5 and 6mm) in a convenient fold-up unit. The tool tips are chamfered for a positive grip and the one-piece fiber-reinforced-resin handle is light, comfortable, slip resistant and 40% stronger than steel.

Many bicycles will not shift or track properly because the front and rear wheels are not in line with the frame. If these conditions still exist after wheel and derailleur adjustments, the seat stays, chain stays, and rear drop outs of the frame may be misaligned. For years the accepted method to check the alignment of the rear drop-out was to run a string on either side. This method does work to some extent. However, it is not accurate because the measurement is not taken at the drop-out. With the Park Tool Frame Alignment Gauge, the alignment can be checked quickly and accurately at the drop-out. It includes a retractable pointer to fit all sizes and types of bicycles.

Park's Gear Clean Brush has a handle on one end with a curved, serrated edge perfect for cleaning between cassette cogs. The other end's tough nylon bristles are ideal for cleaning the derailleurs, chain and other drivetrain parts to keep them clean and prevent premature wear. It also works great on brakes and other components that collect dirt and grime. The GearClean easily fits in a toolbox or pack.

HPG-1 Park Tool High Performance Grease is proprietarily blended to meet the demanding needs of today’s high performance bicycles and high end components. -Superior adherence and extended lubrication life -Extreme temperature range: -20°F to 540°F (-29°C to 282°C) -Highly water resistant -Perfect for high end applications including precision ground and ceramic bearings, pivots and suspension components 4-ounce (113 g) tube

The Handlebar Holder prevents the handlebars and front wheel from swinging to the side and banging into the frame when your bike is mounted in a repair stand. It fits handlebars up to 32mm and all frame tubes up to 50mm in diameter, so it works on almost any road or mountain bike and is sure to make every repair easier.

The Magnetic Parts Bowl is the ideal solution for keeping track of small metal parts. It's 6 inches in diameter and featues an extra-strong magnet so bearings, cones and springs stay put and you don't lose them.

Many chains use a master link that allows the chain to be installed and removed by hand. While master links don't require traditional chain tools, over time, dirt and corrosion can make it difficult to separate them by hand. Park's Master Link Pliers make removing and installing these master links quick and easy. Simply insert the specially sized jaws into the link and squeeze the vinyl-coated handles!

Never be left looking for an errant wrench when you have Park's Metric Wrench Set. It includes 12 high quality Park metric wrenches from 6 to 17mm in diameter, featuring both box and open ends. They are all forged from chrome vanadium steel, then chrome plated for durability and dipped in Park Tool blue vinyl for outstanding comfort and ease of use.

Park's Mini Chain Brute Chain Tool goes anywhere and features a V-shaped handle, a super-strong replaceable pin, and fine threads to make chain removal and installation a breeze. The CT-5 works on any derailleur chain, including Shimano Hyperglide and 9-, 10-, and 11-speed. It works for loosening tight links, too.

Park's Oversize Adjustable Saw Guide guides a hacksaw so that you can accurately cut fork steerers, airfoil-shaped seatposts and more. The guide is made to be held in a vise and it has hardened-steel cutting slots and a secure clamp for the part you're cutting so that you make a perfect cut every time. The guide is compatible with round tubes from 1 to 1-3/4 inches in diameter and airfoil shaped parts up to 3.5 inches long. There are slots for standard and carbon-specific saw blades.

Engineered for fit, function, and leverage, these L-shaped shop-quality hex wrenches are a must have for every workshop. - High-torque, industrial steel wrenches - Straight hex shaft on the short side, ball end on the long side - Includes 2, 2.5, 3, 4, 5, 6, 8, and 10mm - Comfortable, ergonomically designed nylon handles fit perfectly in your hand - Durable wall/pegboard mount tool holder allows easy access and organization

The PK-5 includes over 90 of our best shop tools selected with versatility in mind. A great way to outfit a pro bench or to set up a dream home workshop. The PK-5 is an impressive, professional set of specialty tools that can help you perform hundreds of bicycle repair and maintenance procedures. An investment you'll use and appreciate for decades. Kit Includes: - ATD-1.2 Adjustable Torque Driver - AWS-1 Three-Way Hex Wrench Set: 4, 5, 6mm - AWS-3 Three-Way Hex Wrench Set: 2, 2.5, 3mm - BBT-10.2 Adjusting Cap Tool: For 8-Spline Hollowtech II - BBT-22 Bottom Bracket Tool - BBT-69.2 Bottom Bracket Tool - BO-2 Bottle Opener - CBW-1 Open End Wrench: 8/10mm - CBW-4 Open End Wrench: 9/11mm - CC-4 Chain Checker - CN-10 Professional Cable and Housing Cutter - CNW-2 Chainring Nut Wrench - CP-1.2 Cassette Pliers - CT-3.3 Chain Tool - CWP-7 Compact Universal Crank Puller - DAG-2.2 Derailleur Hanger Alignment Gauge - DH-1 Dummy Hub - DP-2 Threaded Dummy Pedal - DSD-2 Derailleur Screwdriver: Cross Tip - DSD-4 Derailleur Screwdriver: Flat Blade - DT-2 Rotor Truing Fork - FR-5.2H Cassette Lockring Tool with Handle - GSC-1 GearClean Brush - HMR-8 8 oz. Shop Hammer - HXS-1.2 Hex Wrench Set - MLP-1.2 Master Link Pliers - NP-6 Needle Nose Pliers - PAW-6 6" Adjustable Wrench - PH-1.2 P-Handle Hex Wrench Set - PW-4 Professional Pedal Wrench - RR-12 Tape Measure - SBC-1 Spoke, Bearing and Cotter Gauge - SBS-1.2 Socket and Bit Set - SCW-13 13mm Shop Cone Wrench - SCW-14 14mm Shop Cone Wrench - SCW-15 15mm Shop Cone Wrench - SCW-16 16mm Shop Cone Wrench - SCW-17 17mm Shop Cone Wrench - SCW-18 18mm Shop Cone Wrench - SCW-19 19mm Shop Cone Wrench - SP-7 Side Cutter Pliers - SW-0 Precision Spoke Wrench: .127" - SW-2 Precision Spoke Wrench: .136" - SWR-8 3/8" Drive Ratchet Handle - SZR-1 Shop Scissors - TL-1.2 Tire Lever Set - TL-4.2 Tire Lever Set - TL-6.2 Steel Core Tire Levers - TWS-1 Torx Compatible Wrench Set - UP-SET Utility Pick Set - VC-1 Valve Core Tool - ZP-5 5" Flush Cut Pliers

A must-have tool for any rider or mechanic who services hydraulic brakes. The PS-1 Pad Spreader features a tapered edge designed to drive apart and reset hydraulic bicycle brake pads that may have been accidentally engaged. The head of the PS-1 mimics a section of disc brake rotor, with strong stainless steel construction and a long, vinyl-dipped handle for leverage and comfort. The PS-1 can also be used as a temporary stand-in for the rotor when testing or servicing the hydraulic system, negating the need to repeatedly remove and install the wheel. - Thickness: 1.95 mm - Length: 162 mm (6.4")

Clean out or restore damaged threads in crank arms with Park Tool's Pedal Taps. These taps can be used with either steel or alloy crank arms. The set includes both right- and left-hand threads. The 1/2" size is common on "one-piece" cranks. • Includes a set of 2 taps, 1/2" x 20 tpi • Made of high carbon steel, precision ground, and hardened to stay sharp • Fits all conventional tap handles

Made from tough steel and reinforced with extra material at the highly stressed wrench openings, Park’s shop-quality Pedal Wrench is built to easily install and remove pedals, and to last and last. It has 15mm and 9/16-inch precision openings to fit all pedals. And it boasts a long, round, vinyl-coated handle that won’t dig into your hand and provides optimum leverage. There's even a hole in the end of the wrench for hanging it on your toolboard.

Park's PolyLube is specifically formulated to protect bearing components. Its Polyurea grease has extremely high shear strength to protect bottom brackets, headsets, pedals and hubs. Use it on threads, seatposts, stems and cables, too. It's also safe for fork seals, and repels water.

Park’s Professional Cable And Housing Cutter is specifically for use on derailleur and brake cables and housing. It even makes quick work of hard-to-cut shift-cable housing. Its cold-forged, heat-treated-steel handles won't bend and its precision-ground jaws cut perfectly every time. Its dual-density molded grips are specially contoured for superior comfort and control. Plus, there’s a built-in cable-end crimper and a forming hole for reforming housing ends.

These shop-quality L-shaped hex wrenches have a genuine Bondhus balldriver tip on the long arm (excluding the 10mm) for hard-to-reach bolt heads and a straight tip on the short arm for high-torque applications. The HXS-1.2 includes a handy portable tool organizer/holder and it's hinged for easy access. • Includes 1.5, 2, 2.5, 3, 4, 5, 6, 8, and 10 mm sizes • Wrench tips are precision chamfered for a clean, tight fit • Made from industrial-quality Bondhus Protanium high torque steel

Park's Professional Pedal Wrench features an angled, oversize head for maximum leverage. It has two 15mm wrenches at different angles, so you can maximize your leverage, and a long, round, vinyl-coated handle that won’t dig into your hand the way flat wrenches do. There's even a hole in the end for hanging the wrench on your toolboard.

The next generation of wheel truing stands! The TS-4 is made to accurately gauge any size wheel, with or without the tire installed. The TS-4 has many of the same features as Park Tool's famous TS-2.2 with some additional attributes to accommodate today’s wide variety of hub, wheel and tire combinations. - Both uprights move simultaneously to always keep wheel centered in the stand. - Accommodates axle widths from 75mm to 215mm - Direct action caliper arm adjusts to work with wheel sizes from 16" to 29"+ - Accommodates tire widths up to 5" with or without brake rotor mounted - Machined, welded, assembled and calibrated in our factory in St. Paul, MN - Precise accuracy, operation and adjustability - Built in thru-axle adaptors - Chrome plated and powder coated heavy gauge steel construction - Removable, replaceable nylon caliper tips to protect painted/anodized rims - Dial Indicator compatible (TS-2Di) (Sold separately) - Rotor gauge compatible (DT-3 & DT-3i.2) (Sold separately)

Park Tool's Replacement Chain Tool Pin (2-Pack) fits Park Tool's CT-1, CT-2, CT-3, CT-3.2, CT-5, and CT-7 Chain Tools. • Made from hardened alloy tool steel • Uses 7mm or 9/32" 12 pt box end/socket • Sold singly or in pairs

Everyone wears out their Park Tool work stand clamp covers at some point. Find replacement covers for yours here. Each cover is constructed of soft, durable composite rubber. See below to determine which covers fit your Park Tool stand clamp: - 1002: fits 100-3X and 100-5X extreme range clamps - 1185: fits clamps on the repair stands PCS-9, PCS-10, PCS-11, and PCS-12 - 1259: fits 100-4X, 100-6X, 100-7X, and 100-15X clamps - 1960: fits 100-3D, 100-5D, and 100-25D Professional Micro Adjust Repair Stand Clamps - 468B: fits clamps with double cable reliefs, including 100-3C, 100-5C, 100-8C, 100-8Y, and 100-9C clamps - 467B: fits clamps with single cable relief, including PRS-2 through PRS-8 (for older-style clamps, non-current) - 468G: fits PCS-1 and PCS-2 clamps with double cable reliefs (clamp models: 100-1C, 100-1CA, and 100-2C) - 467G: fits PCS-1 and PCS-2 clamps with single cable relief (for older PCS-series stands only; not for current model stands) - 466: Rubber Replacement Clamp Cover Set (fits older clamps with plastic-dipped jaws)

This is a single replacement pin for Park Tool HCW-4 and SPA-6 pin spanner wrenches.

If you have a bike with disc brakes, you'll want Park's Rotor Truing Fork. It allows you to gently adjust bent and damaged disc-brake rotors. It's made from high-quality steel and features 2 laser-cut slots for precise adjustments and a vinyl handle for comfort and control.

A perfect way to start a bicycle tool collection! A great combination of tools to help a home mechanic clean, adjust, maintain, and do some basic repairs on their bike. The SK-4 includes more than 15 genuine Park Tool products that can perform dozens of tasks and includes a custom Park Tool toolbox with extra room for spare parts and more tools. The SK-4 includes: - AWS-10 Fold-Up Hex Wrench Set - BBB-4 Big Blue Book of Bicycle Repair - CC-3.2 Chain Checker - CN-10 Professional Cable and Housing Cutter - CT-5 Mini ChainBrute Chain Tool - FR-5.2 Cassette Lockring Tool - GSC-1 GearClean Brush - HCW-16.3 Chain Whip/Pedal Wrench - HR-8 8mm Hex Wrench - MLP-1.2 Master Link Pliers - SD-2 Shop Screwdriver: #2 Phillips - SW-7.2 Triple Spoke Wrench - TL-1.2 Tire Lever Set - TWS-3 Torx Compatible 3-Way Wrench

Park's Adjustable Pin Spanner is the perfect tool for adjusting bottom brackets with threaded cups that have pin holes. It will also work on headset cups with holes and freewheel lockrings with them, too. This fine tool is made of chrome-plated steel and boasts hardened replaceable pins.

Updated to fit current 12-speed cassettes, this combination chain whip and freewheel / lockring remover wrench is heat treated to prevent bending, flexing and wear and features a long, molded handle in addition to a built in hex shaped driver. - Works on 5- to 12-speed road and mountain bike cassettes and freewheels - 1-inch (25.4mm) box-end wrench fits Park Tool Freewheel / Cassette Lockring Tools - Features hardened pins to keep the chain in place

Park's Screw-Type Chain Tool is the ideal shop tool for easy and reliable chain maintenance and repair. The sliding shelf makes it compatible with 1/8th-inch chains and all 3/32nd-inch chains, from 5- to 11-speed. It's made from investment-cast tool steel and has long vinyl-coated handles and fine threading for easy chain pin removal. It also includes a stiff-link loosener and comes with an extra pin.

The BBT-16 removes and installs the self-extracting/one-key release caps on SRAM and RaceFace cranks with a 16mm hex hole. Features investment cast steel construction and an option to use 8mm hex for better leverage.

Park's Cone Wrenches are made of durable tool steel and are nice and thin to fit on the small-clearance cones found on hubs and other bearing assemblies. Plus, they work as regular wrenches, too. They feature Park's special Y heads that put more material where it's needed for excellent durability and strength. Most applications require at least 2 cone wrenches. If you have questions please contact us and we can recommend the correct sizes for your needs.

Park's Shop Screwdrivers are pro-quality tools featuring durable and precise heat-treated chrome-vanadium tips and shafts and dual-density handles for an excellent grip.

Park's Side Cutter Pliers are professional quality, 7-inches long, and made from heat-treated, forged chromoly steel for crisp, easy cuts and durability. They boast soft-touch, dual-density handles for an excellent grip, too.

Park's professional-quality, precision-sized spoke wrenches are hardened and chrome plated for long service. Wrenches are vinyl coated in one of four colors indicating the size at a glance. You will find these wrenches in virtually every professional bike shop and every shop mechanic's personal tool stash. Make sure you have the sizes you need in your home toolbox and bike bag.

Shop quality, L-shaped, high-torque industrial steel hex wrenches with a ball end on the long arm and stubby short arms specifically for reaching bolt heads in tight spaces (like caliper mounting bolts, chainring bolts, etc.). Other features include chamfered tips, tight tolerances, and a handy portable tool organizer/holder. 1.5, 2, 2.5, 3, 4, 5, and 6mm hexes.

Park's SuperGrip Carbon Assembly Compound is a combination of grease and tiny particles and is ideal for lubricating, protecting and tightening carbon components, like seatposts, handlebars and stems. SuperGrip solves the problem of carbon parts moving and slipping, which can happen if they are not lubed, or you apply standard grease or lube to them. It also works well with aluminum and steel components.

Designed and built specifically for a wide variety of bicycle hex work the THH-1 is a set of eight common sizes of professional quality T-Handle hex wrenches built for speed, efficiency, leverage and a perfect fit. Soon to become your favorite hex set, the THH-1 includes a handy tool holder that mounts to any vertical surface, including pegboard and solid surfaces (fasteners not included). - Carefully selected combination of Chrome Vanadium and S-2 tool steels - 2, 2.5, 3, 4, 5, 6, 8 and 10mm hex wrenches included - Unique anodized aluminum Speed Spinner makes running long bolts in and out quick and effortless - Machined, chamfered tips allow easier insertion into hex fittings - Integrated “Strip-Gripper” twisted hex that makes removal of most bolts with stripped or over-sized hexes fast and easy - Sliding T-handle creates increased leverage and multiple access positions - Tool holder is included with the set and mounts to any wall, bench or tool box, perfectly positioning each wrench for easy access and storage

Threadlockers lock threaded assemblies and keep them from loosening. Notice: Park Tool AP-1 Adhesive Primer must be used to prep all components, fasteners and carbon fiber surfaces prior to application of Park Tool threadlockers or retaining compound. Failure to do so could result in permanently bonded parts.

Threadlockers lock threaded assemblies and keep them from loosening. Notice: Park Tool AP-1 Adhesive Primer must be used to prep all components, fasteners and carbon fiber surfaces prior to application of Park Tool threadlockers or retaining compound. Failure to do so could result in permanently bonded parts.