Tool Used For Screws In Bottom Of Mac

Sep 18, 2019 /Bottom Brackets

There are many different brands and models of bottom brackets as well as many variations on tool fittings for their service. This article will review the selection of Park Tool options for various bottom bracket systems in threaded frame shells and for thread-thru bottom brackets. For a review of the various bottom bracket standards, see Bottom Bracket Standards and Terminology.

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  1. Use this precision P5 pentalobe screwdriver to open Retina MacBook and MacBook Air laptops. The P5 driver is compatible with the 5-point star shaped pentalobe 5IPR security fasteners used on the bottom of some Apple laptops. The iFixit P5 pentalobe screwdriver features a knurled grip and rubberized, ergonomic handle with swivel top.
  2. You lock the pliers on the driver end of the bit, maneuver it into the gap, then use one hand to stabilize the bit and push it into the screw while you use the other to turn the bit using the pliers. Also, you can use a closed end of a combination wrench to turn the bit.

Craftsman 17-piece Screwdriver Set If you’ve ever worked with a Power Mac G5, iMac, eMac, Mac Pro, or other desktop case, you know that these computers have screws placed at the bottom of assorted.

Preliminary Info

To determine the correct tool, begin by inspecting the bottom bracket. App to clean up mac computer. In some cases it will be necessary to remove the crank in order to measure and determine the tool choices.

If there are no tool fittings visible it is likely a press fit bottom bracket. See Bottom Bracket Tool Selection: Press Fit.

If the bottom bracket is installed and removed using threads, there will be tool fittings visible. This is also the case for frames using press fit shells and a “thread-together” bottom bracket, also known as a “thread-thru”. For purposes of tool selection, a thread-together bottom bracket is treated the same as a threaded bottom bracket.

Tool fittings can be notches or indentations on the outer perimeter, splines on the inside perimeter, or pin holes on the face. Count the number of tool fittings on the cup.

Next use a caliper to measure the diameter or width of the tool fittings. For external notches, simply measure the outer diameter of the bottom bracket cup or adapter as seen below.

Although the tools fit at the inside portion of the external splines, measuring the outside will be enough to differentiate the standard.

For tool fittings on the inside perimeter, measure to where the tool would fit as seen in the image below.

It can be difficult to get exact measurements. For most models, getting within a millimeter will be good enough to get the correct tool.

2Tool Used For Screws In Bottom Of Mac

Tool Finder Table

Tool Used For Screws In Bottom Of Mac

Use the table below to find the best match between the bike and the tool examples. There are also some proprietary brands not listed here.

Tool FittingDimensionTool
2 flats16mm widthHCW-11
2 flats36mm widthHCW-4
4/6/8 pin holes3mm holeSPA-1
3/4/6/8 external notches44–46mm ODHCW-5
6 external notches43mm ODBBT-4
8 external notches40–45mm ODBBT-18
12 internal splines23mm IDBBT-5/FR-11
12 external notches46mm ODBBT-79
12 external notches48mm ODBBT-35
12 external notches50.4mm ODBBT-47
16 external notches39mm ODBBT-49.2, BBT-29
16 external notches
41mm ODBBT-59.2
16 external notches44mm ODBBT-69.2, BBT-19.2, BBT-9
16 external notches49mm ODBBT-27.2, BBT-29
16 external notches52.5mm ODBBT-47
20 internal splines31.5mm IDBBT-22, BBT-32
24 external notches46mm ODBBT-79
36 external notches51.7mm ODBBT-35
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Tool Fittings

2 Flats, 16mm Width

Examples include adjustable bottom bracket non-drive-side cups using two wrench flats at 16mm.

Use the Park Tool HCW-11

2 Flats, 36mm Width

Examples include many adjustable ball bearing bottom brackets using a drive side (right side) cup with two wrench flats spaced at 36mm.

Use the Park Tool HCW-4

4/6/8 Pin Holes

Examples include many adjustable ball bearing bottom brackets using a non-drive (left side) cup with 4, 6, or 8 pin holes.

Use the Park Tool SPA-1

3/4/6/8 External Notches, 44–46mm OD

Examples include adjustable cup-and-cone bottom brackets with left side outer lockring.

Use the Park Tool HCW-5

6 External Notches, 43mm OD

Examples include Campagnolo® cartridge bottom bracket using six radiused tool fittings.

Use Park Tool BBT-4

8 External Notches, 40–45mm OD

Examples include Truvativ® Giga Pipe™, Bontrager® and others.

Use Park Tool BBT-18

12 Internal Splines, 23mm ID

Examples include Campagnolo® Centaur®, Chorus®, and Record® Track, as well as Miche® square spindle models. The tool fitting is the same as the Campagnolo® cassette lockring tool.

Use Park Tool BBT-5/FR-11

12 External Notches, 46mm OD

Examples include Race Face® Cinch®, Rotor® 30, and others.

Use Park Tool BBT-79

12 External Notches, 48mm OD

Tool Used For Screws In Bottom Of Macbook

Examples include Praxis Works® M30 bottom bracket cup.

Use the Park Tool BBT-35
Note: This is a double-sided socket with 12 notches at 48mm and 18 notches at 51.7mm

12 External Notches, 50.4mm OD

Examples include Chris King® ThreadFit™ 30, Wheels Mfg™, and others.

Use Park Tool BBT-47
Note: This is a double-sided socket with 16 notches at 52.2mm and 12 notches at 50.4mm

16 External Notches, 39mm OD

Examples include Shimano® XTR® BB91/3/4, Dura-Ace® R9100, and Shimano® STEPS® Hollowtech® II e-bike motor lockring.

Use Park Tool BBT-49.2 or BBT-29

Tool Used For Screws In Bottom Of Machine

16 External Notches, 41mm OD

Examples include Shimano® XT® MT800, Ultegra® BBR60/72, and others.

Use Park Tool BBT-59.2

16 External Notches, 44mm OD

Example include Shimano® Hollowtech® II, SRAM® GXP®, Chris King® ThreadFit™ 24, Campagnolo®, Race Face®, Praxis Works®, and more.

Use Park Tool BBT-69.2, BBT-19.2, or BBT-9

16 External Notches, 49mm OD

Examples include FSA® MegaEvo® and Wheels Mfg™.

Use Park Tool BBT-27.2 or BBT-29

16 External Notches, 52.5mm OD

Examples include Chris King® and Wheels Mfg™.

Use Park Tool BBT-47
Note: This is a double-sided socket with 16 notches at 52.2mm and 12 notches at 50.4mm

20 Internal Splines, 31.5mm ID

Examples include cartridge bottom brackets from Shimano® square spindle type, Shimano® Octalink®, SRAM®, Sunlite®, FSA®, Suntour®, and others.

Use Park Tool BBT-22 or BBT-32

24 External Notches, 46mm OD

Examples include the SRAM® DUB® bottom bracket cup. This is the same pattern and size as cups with 12 notches and 44mm OD.

Tool

Use the BBT-79

36 External Notches, 51.7mm OD

Examples include Praxis Works® M35. The 36-notch cup pattern fits the 18-notch pattern of the BBT-35.

Use Park Tool BBT-35
Note: This is a double-sided socket with 12 notches at 48mm and 18 notches at 51.7mm

Next article in this series

Bottom Bracket Removal & Installation: Threaded View Article

Bottom Bracket Removal & Installation: Thread-Together View Article

Bottom Bracket Service: Adjustable Cup-and-Cone View Article

Related articles

Bottom Bracket Tool Selection: Press Fit View Article

Bottom Bracket Standards and Terminology View Article

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