Tools

Park Tool's professional-quality Snap Ring pliers are made from forged, heat-treated cro-moly steel with a return spring and vinyl dipped grips. The RP-1 has .9mm tips on straight blades for small, internal snap rings. The tips open from 22mm to 0 (tips touching).

Park combines the three most used bolt sizes into one convenient wrench. The 3-Way Sprocket Wrench sports 8, 9 and 10mm sockets made from forged chrome-vanadium steel in Park's classic Y-shape that offers plenty of leverage and a comfortable grip.

Park Tool introduced the bicycle world to the 3-way hex wrench set over 30 years ago. Our 3-way wrenches fit perfectly in the palm of the hand and provide excellent leverage, making them a favorite of countless shop mechanics worldwide. AWS-1 FEATURES - 4mm, 5mm, and 6mm hex set - Wrenches made from industrial tool steel, through hardened and tempered for long life - Chamfered tips for a perfect fit

Park Tool introduced the bicycle world to the 3-way hex wrench set over 30 years ago. Our 3-way wrenches fit perfectly in the palm of the hand and provide excellent leverage, making them a favorite of countless shop mechanics worldwide. AWS-3 FEATURES - 2mm, 2.5mm, and 3mm hex set - Wrenches made from industrial tool steel, through hardened and tempered for long life - Chamfered tips for a perfect fit

Shop-quality, adjustable torque driver that limits torque applied to fasteners, preventing over-tightening and damage to lightweight components. The ATD-1.2 features all-metal internal construction with a comfortable, ergonomic composite molded grip. Each tool is assembled and calibrated at Park Tool's factory in Minnesota.

Big and powerful, Park's Adjustable Wrench is forged from steel and chrome plated for maximum durability. Its jaws open up to 36mm and the torque-friendly, 12-inch handle is vinyl dipped for comfort.

Removes and installs crank caps on Shimano® Hollowtech II® cranks. Includes built in hook to lift the safety plate, speeding crank removal. Steel, investment cast body provides good leverage and includes an option to use with an 8mm hex wrench for removing seized caps.

The 4th edition of the Big Blue Book of Bicycle Repair is updated with the latest information, procedures and techniques and covers everything from minor adjustments to complete overhauls. The BBB-4 features clear, step-by-step instructions, high quality color photos and useful charts and graphs to thoroughly explain and demonstrate hundreds of repairs. Written by one of the world’s leading authorities on bicycle repair and maintenance, Park Tool Director of Education, Calvin Jones, the Big Blue Book is the perfect reference guide for nearly any level mechanic and every bike. New information and topics included in the BBB 4th edition: - 12-speed and 1x drivetrains - Tubeless tires - Disc brakes - Electronic shifting - New wheel building content - Updated headset and bottom bracket standards - Updated torque specifications - Updated troubleshooting tables

The BBT-22 is a shop-quality tool for installing and removing Shimano and ISIS Drive splined 20-tooth bottom bracket cups. Made from investment-cast steel, the BBT-22 ensures maximum engagement with the bottom bracket cup. It can be used with a 3/8-inch drive torque wrench, a 3/8-inch ratchet driver, a 32mm wrench, the Park FRW-1 Freewheel Remover Wrench (sold separately), or a 1-inch wrench.

A precision CNC-machined aluminum tool for the installation and removal of select threaded bottom brackets with 16-notch tool fittings, including Shimano XTR BB93, Dura-Ace BB9000, and Token bottom brackets. Manufactured in-house by Park Tool, anodized for easy identification and featuring a ratchet/torque wrench-compatible 3/8" drive. The BBT-49.3 features integrated threads for full compatibility with the Park Tool BBT-RS Bottom Bracket Tool Retaining System (sold separately). The BBT-RS uses an adjustable spring-based tension system to apply consistent, adjustable pressure to the tool, ensuring full engagement with the tool fitting and preventing slippage. Fits 16-notch threaded bottom bracket tool fittings with a major diameter (outside of notches) of 39-40 mm and a minor diameter (inside of notches) of 37.6 mm, including: - Shimano XTR BB93 - Shimano Dura-Ace BB9000 - Token Also fits chainring lockrings on Shimano STEPS square spindle e-bike systems including: - E6000 - E6002 - E6050 - Replacement for Shimano TL-FC38 tool - 3/8" drive fitting

A precision CNC-machined aluminum tool for the installation and removal of select components with 16-notch tool fittings, including bottom brackets, center lock disc brakes, and e-bike motor lockrings. Manufactured in-house by Park Tool, anodized for easy identification and featuring a ratchet/torque wrench-compatible 3/8" drive. The BBT-69.4 features integrated threads for full compatibility with the Park Tool BBT-RS Bottom Bracket Tool Retaining System (sold separately). The BBT-RS uses an adjustable spring-based tension system to apply consistent, adjustable pressure to the tool, ensuring full engagement with the tool fitting and preventing slippage. Fits 16-notch tool fittings with a major diameter (outside of notches) of 44–45 mm and a minor diameter (inside of notches) of 42.7 mm, including: - Shimano BB80, BB5700, XT BB70, BB51, and previous external bearing threaded bottom bracket cups - Threaded bottom bracket cups from Campagnolo, Chris King, FSA MegaExo, Hope, SRAM/Truvativ GXP, Race Face X-type, Surly, Wheels, Fulcrum, and others - Center lock disc brake rotor lockrings - Bafang BBSH, BBS02 mid-drive motor lockrings - 3/8" drive fitting

A precision CNC-machined aluminum tool for the installation and removal of select threaded bottom brackets with 12-notch tool fittings, including SRAM BSA DUB, Race Face Cinch, Rotor BSA30, and others. Manufactured in-house by Park Tool, anodized for easy identification and featuring a ratchet/torque wrench-compatible 3/8" drive. The BBT-79.3 features integrated threads for full compatibility with the Park Tool BBT-RS Bottom Bracket Tool Retaining System (sold separately). The BBT-RS uses an adjustable spring-based tension system to apply consistent, adjustable pressure to the tool, ensuring full engagement with the tool fitting and preventing slippage. Fits 12-notch threaded bottom bracket tool fittings with a major diameter (outside of notches) of 45–47 mm and a minor diameter (inside of notches) of 44 mm, including: - SRAM BSA DUB - Race Face Cinch - Rotor BSA30 - Zipp Vuma - Hawk Racing BB3086 - and more - 3/8" drive fitting

The BKD-1 Hydraulic Brake Bleed Kit will bleed most models of DOT-fluid-based hydraulic brakes. Hydraulic systems need bleeding to remove any air bubbles and to inject new, clean fluid. - Designed and built for home use and the rigors of daily commercial use - Includes two syringes, hoses with shutoff clips, multi-size bleed blocks and a unique attachable syringe mount - Housed in a rugged reusable case - Machined stainless steel and 7075 aluminum fittings to service SRAM, Hayes, Formula, Hope and other brands of DOT-fluid-based hydraulic brake systems - Replacement parts available - Brake fluid not included

The BKM-1.2 Hydraulic Brake Bleed Kit will bleed most models of mineral oil-based hydraulic bicycle disc brakes, including models made by Shimano®, Magura®, TRP®, Tektro®, Trick Stuff®, SRAM® DB8, Campagnolo®, Promax®, and Clarks®. Bleeding of hydraulic brakes removes air bubbles and contaminants from the braking system, for long-lasting components and peak performance. The BKM-1.2 is built for the rigors of daily commercial use and includes two syringes, hoses with shutoff clips, multi-size bleed blocks, a bleed funnel, and a set of our unique mountable syringe holders, as well as multiple hose fittings to fit the multiple standards found on hydraulic bicycle brake systems. Every part is replaceable and available from Park Tool. Housed in a rugged storage case. Includes: -  Two 20 mL syringes -  Two hose assemblies with shutoff clips -  One hose assembly with integrated fitting for bleed nipples such as those found on Shimano® mineral oil brake systems -  One open-ended hose assembly -  Bleed funnel with stopper -  Two 10 mm/12 mm universal bleed blocks -  Two 11 mm bleed blocks -  Two adjustable syringe holders -  M4 x 0.7 adapters — SRAM® DB8, Trick Stuff®, Campagnolo® (x2) -  M5 x 0.8 adapter — Formula™ Cura™, Tektro®, Hayes® (x2) -  M6 x 0.75 adapter — Magura® -  M6 x 1.0 adapters — universal (x2) -  M6 x 1.0 adapter — Promax® -  M7 x 0.75 adapter — Shimano® -  Hose compression sleeve — universal -  Fluid disposal bag -  Set of spare O-rings and hose -  Replacement parts available -  Brake fluid not included NOTE: The BKM-1.2 is for mineral oil-based hydraulic bicycle brake systems only. DOT fluid and mineral oil should never be mixed in the brake system or in their respective service tools. Cross-contamination of brake fluid may cause seal failure which may result in brake failure. For brakes using DOT fluid use the Park Tool BKD-1.2 Hydraulic Brake Bleed Kit — DOT.

Keep your work area tidy with Park's Bench Top Small Parts Holder. It's constructed from rugged stainless steel with a clear, acrylic hinged top that lets you see what's inside. It also includes 4 removable bins that are perfectly sized to hold small parts, cable end caps, grease and whatever other little items you can think of.

Park's Bladed Spoke Holder is a must for building and truing wheels that feature bladed spokes. It has 4 different size slots to fit a wide variety of bladed (aero) spokes from .08 to 2mm wide. It holds them safely in place to prevent twisting as you turn the nipple to true and tension the wheel.

Park's BBT-32 is the perfect solution for the home mechanic installing and removing Shimano and ISIS Drive splined 20-tooth bottom bracket cups. Made from investment-cast steel, the BBT-32 utilizes a flat tooth profile to ensure maximum engagement with the bottom bracket cup and features 32mm wrench flats.

Park's BBT-18 is a heavy duty, investment cast tool for installing and removing all Shimano, ISIS Drive, and ISIS Overdrive 8-notch bottom bracket cups.

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.

Park's Bottom Bracket/Cassette Tool for Campagnolo is an indispensable tool for your Campagnolo drivetrain. It's for installing and removing all Record, Chorus, Centaur and Athena bottom brackets, and all Campagnolo cassette lockrings.

A dirty drivetrain causes poor shifting and unnecessary wear to expensive parts. The Chain Gang contains everything needed to quickly and easily clean the chain, freewheel cogs, and chainrings. The Chain Gang includes: - CM-5.3 Cyclone Chain Scrubber - GSC-1 GearClean Brush - 8 oz. bottle of Bio ChainBrite The CG-2.4 works on nearly any bike, including multi-speed, single-speed, and e-bikes.

The Cyclone Chain Scrubber brushes are replaceable. The RBS-5 brush set includes the large side scrubbing brush, two roller brushes, and two wicking foam blocks.

Cleans bicycle chain quickly, easily, and effectively — without the hassle and mess of removing the chain from the bike. The Cyclone uses a large solvent reservoir, hundreds of rotating bristles, and a two-step cleaning process to get chains really clean, improve shifting performance, and extend the life of the chain and other expensive drivetrain parts. - Works with all multi-speed bikes (5, 6, 7, 8, 9, 10, 11, and 12-speed) as well as some single-speed models and e-bikes - Strong magnet at the bottom of the fluid reservoir holds metallic particles scrubbed from the chain - Special wicking sponge draws solvent from the chain as it exits, minimizing drips and mess - Sturdy handle makes the Cyclone easy to use and control - Holds 2 fluid ounces (59ml) of solvent

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

Heat-treated alloy tool steel, one inch base fits wrench or bench vise. Thin-wall construction allows use without removal of cones and locknuts. The FR-5 has 12 splines that are approximately 23.4mm across. - Fits Shimano, SRAM, Sunrace, Suntour, Chris King and other cassette lockrings - Fits the SRAM XX1 11-speed cassettes - Also fits Shimano disc brake lockrings - Always use a quick-release skewer to hold the tool in place and snug to cogs when loosening; for solid axles, use the axle nut

A fast and convenient tool to remove and install 12-spline Shimano/SRAM style cassette lockrings, as well as similar lockrings on rotor discs. The FR-5H features a modified FR-5 tool that allows use without removing most quick release skewer nuts. The removable, threaded steel handle makes it possible to replace a worn or damaged head. - Fits Shimano, SRAM (including 1x), SunRace, SunTour, Chris King and other cassette lockrings - Also fits some Shimano disc brake lockrings

A worn chain shifts poorly and wears sprockets at an accelerated rate. Park Tool's Chain-Wear Indicator is a “go-no go” gauge designed to accurately indicate when a chain reaches .5% and .75%, the points at which most chain manufacturers suggest replacement. The updated CC-3.2 is longer, more accurate and features permanent measurement markings.

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 Compact Crank Puller is used to remove Shimano Octalink, ISIS Drive and square-taper cranksets. It includes 2 rotating tips (16.3 and 11.3mm) to make the job easy. This is a great tool for your travel and home tool kit.

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.

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

Precision component screwdriver machined to exact standards to ensure a perfect fit on compatible component fasteners. Featuring an ergonomic, CNC machined and hard anodized 6061 aluminum handle.

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.

Also called a sleeping hub, the Dummy Hub slides into rear dropouts and replaces the rear wheel for chain cleaning and transport. The DH-1 works with all derailleur and 1/8" chain. The unique design allows the bike to be shifted and works with open dropout and thru-axle frames up to 12mm.

The Park FR-3 Freewheel Remover fits SunTour four-notch freewheels. It's built thin so that removing axle parts is unnecessary. And, it's constructed of durable heat-treated steel.

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.

The Park Tool Fold-Up Hex Wrench Set combines 4, 5 and 6mm hexes, a flat blade screwdriver and a T25 Torx compatible driver into one convenient fold-up tool. Its multi-position composite handle is comfortable, lightweight, slip-resistant, and 40% stronger than steel handles.

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.

Frame Taps will become a lifesaver at some time for virtually every mechanic. As with all Park Tool Taps, these are made of high carbon steel and are precision ground. Park Tool Frame Taps cut easily and fit conventional tap handles. For water bottle, toe clip, fender and rack bosses. The TAP-8 is 5mm x 0.8 for use with water bottle, toe clip, fender and rack bosses.

12 splines, 22.6mm diameter fits Shimano, Sachs Aris, Sun Race, DNP Epoch, and other 5–10 speed freewheels. The FR-1.3 includes an enlarged thru-hole to accommodate 14mm axles.

A sturdy bicycle cleaning brush with a unique angled and contoured shape – perfect for cleaning cassettes and freewheels as well as tires. With a strong ergonomic handle and stiff nylon bristles, the GSC-4 scrubs away the toughest muck and mess.

This handy tool will save time and frustration! Quickly and accurately cuts hydraulic brake line then precisely installs hose barbs into the tubing when the brake line is either on or off the bike. - Cuts hydraulic brake hose (does not cut steel braided hydraulic hose) - Installs press-in style barbed hose inserts - Replaceable parts including push pin tip and stainless steel blade - Hard anodized body for improved tool wear - Lightweight, CNC machined aluminum body Replacement parts: - 2494K Cutting Blade (set of 2) - 2497 Push Pin Tip

The HCW-16.3 is a combination 15mm pedal wrench and chain whip. Use for both pedal removal/installation and for cassette removal. Chain whip features improved compatibility with 5-speed to 12-speed mountain and road bike cassettes and freewheels. The HCW-16.3 is 10.75" long (27.3cm).

Park's versatile Headset Wrench is constructed from hardened, laser-etched steel for the maximum in durability and precision. The HCW-6 features a 32mm headset wrench on one end and a 15mm pedal wrench on the other.

Get those heads sealing like new and reduce compressor energy waste with Park Tool's Head Seal Kit. This kit will help get rid of that hissing sound you've been hearing when it has been too long since servicing your Park Tool INF-1 or INF-2 shop inflator. Kit includes: - 1 #1586 Presta Seal - 1 #1588 Schrader Seal - 2 #1576-2 O-rings for Shuttle-valve - 1 #1682-2 O-ring for INF-1 and INF-2 Head Adaptors

Once you try on Park's Heavy Duty Shop Apron, there's no going back to standard aprons. The SA-3 is made from heavy 10-ounce cotton canvas and has two rows of bar tack reinforced pockets for stashing pens, parts, tools, etc. The special crossback design removes pressure from the neck for all day comfort and a nylon quick release makes the apron easy to adjust and take off. This sweet apron is a full 35-inches in length and the bottom 7-inches of the apron can be snapped up for a custom height fit. Plus, an embroidered Park Tool logo makes the apron as good looking (even when it's dirty) as it is functional.

Park's AWS-8 Hex Wrench Set features Bondhus balldriver ends, which facilitate use when the tool is at an angle to the bolt. This is great for working in hard-to-reach areas, such as reaching water-bottle-cage screws. The AWS-8 has 4, 5, and 6mm wrenches, which are the most common bicycle bolt sizes. Plus, its Y shape and vinyl coating provide excellent leverage and comfort.

Park's AWS-7 features a Y-shaped nylon handle with 4 and 5mm Allen wrenches and a T25 Torx wrench. This convenient 3-in-1 tool keeps commonly used wrenches together and offers an excellent grip as well.

Park's Hydraulic Brake Piston Press is used to set or reset the piston(s) inside hydraulic disc brake calipers during installation, maintenance and repair. Just push it into the caliper to wedge the piston into place. It's made of tough tool steel with a comfortable and oversize rubber handle for a great grip.

"Take the guesswork out of internal routing. The IR-1.3 speeds the installation of internally-routed cable, housing, electronic wiring and hydraulic hose into carbon fiber, titanium, and aluminum frames. The straightforward guide magnet system utilizes five long guide cables with unique fittings, which can be routed through the frame in a number of ways using the included guide magnet. Everything is neatly stored in a convenient compact case. A true time and frustration saver!??Includes five 188 cm (74"") guide cables with attached magnets and unique fittings: • Barbed adapter — Threads into the end of brake & shift cable housing as well as hydraulic brake hose • Rubber adapter — Securely holds electronic shifting wire such as Shimano® Di2, SRAM® RED® eTAP®, FSA® K-Force® WE®, and Campagnolo® EPS • Di2®-specific adapter — Specially-designed connector clips into the end of Shimano® E-tube® Di2® shift wire, and is perfectly sized to fit into frame holes as small as 6 mm • Di2® EW-SD300-specific adapter — Specially-designed connector clips into the end of Shimano® E-tube® Di2® EW-SD300 shift wire • Reverse-polarity magnet — Used in conjunction with any of the other guide cables - feeds into the opposite end and meets the leading cable in the middle, aiding in routing on frames with tricky interior shapes Also included: • Double-threaded barb — Securely attaches new housing or hydraulic hose to existing housing or hose, allowing for easy replacement without redoing the routing • Guide magnet — routes guide cables through the frame from the outside"

Take the guesswork out of installing cables, wires and housing inside the frame. The IR-1.2 speeds the internal frame routing of electric wires, shift cable/housing, brake cable/housing and hydraulic tubing on carbon fiber, titanium, and aluminum frames. Kit includes four plastic-coated 250cm cables with attached magnets and unique fittings plus an external guide magnet to speed operation. Newly updated to include a dedicated E-tube Di2 cable connector that easily pulls through a 6mm frame hole. Opposite polarity magnets on cables seek and attach inside frame tubes, making it easy to route through frame entrances and exits. Works with any size frame including tandems. A true time and frustration saver!

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!

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 Tool's Mini Fold-Up Hex Key Set is a diminutive version of Park Tools famous fold-up tools, featuring 3, 4, and 5mm hexes, a T25 Torx compatible bit, combo screwdriver, and a key ring holder, all in a tough composite case. 2.6 inches (66mm) long

Engineered for fit, function, and leverage, these L-shaped shop-quality Torx compatible wrenches are a must have for every workshop. - High-torque, industrial steel wrenches - Torx compatible drivers at each end - Includes T6, T8, T10, T15, T20, T25, T30, and T40 - Comfortable, ergonomically designed nylon handles fit perfectly in your hand - Durable wall/pegboard mount tool holder allows easy access and organization

Choose the perfect tool for the job with Park's P-Handled Hex Wrenches. These top-shelf Allen wrenches come with offset handles made from durable nylon in a comfortable, ergonomic design. They are made of chrome vanadium for exceptional durability. The long shafts feature Bondhus heads for accessing hard-to-reach bolts and the short ends are chamfered for extra grip and high-torque applications.

They always say, the right tool for the right job. Park's P-handled Torx Wrenches are available in T6, T8, T10, T15, T20, T25, T30 and T40 sizes. They feature offset handles made from durable nylon with a comfortable, ergonomic design. The wrenches are made of high-torque industrial steel for excellent durability.

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

Clean out or restore damaged threads in crank arms with Park Tool's Pedal Taps. They're sold as a set of right and left hand threads. Made of high carbon steel, precision ground, and hardened to stay sharp, they cut easily and fit all conventional tap handles. • Includes a set of 2 taps, 9/16" x 20 tpi • Made of high carbon steel, precision ground, and hardened to stay sharp • Fits all conventional tap handles The tap drill size for a 9/16-inch x 20 tpi thread is nominally 33/64-inch.