What size screw does MacBook Pro 15-inch Retina (Mid 2015) lower case use?

M1.6 × 2.3–3.1 mm for lower-case screws in the M1.6 class, supplied in two lengths.

How long are the screws in MacBook Pro 15-inch Retina (Mid 2015) lower case?

The records range from 2.3 to 3.1 mm depending on the position, so match each screw to its own hole.

What is the thread pitch of an M1.6 screw?

0.35 mm (coarse), which is the standard pitch for M1.6 machine screws; a 0.2 mm fine pitch exists but is uncommon. The tap drill is 1.25 mm and the normal clearance hole is 1.8 mm.

What screwdriver do I need for MacBook Pro 15-inch Retina (Mid 2015) lower case?

The sources do not name the drive. For M1.6, Phillips heads normally take PH00 and Torx heads T4–T5; socket heads take a 1.5 mm hex key.

Can I use an imperial screw instead of M1.6?

No. Imperial look-alike: #1-72 UNF (1.85 mm) is larger; there is no true imperial equivalent. Use a true M1.6 screw so it does not cross-thread or strip the hole.

Where can I buy replacement screws for MacBook Pro 15-inch Retina (Mid 2015) lower case?

TechSpareWarehouse (our own store) lists M1.6 x 3mm, which matches the length in the records above.

MacBook Pro 15-inch Retina (Mid 2015) lower case screw size

M1.6 · 2.3 to 3.1 mm long

The screws used on MacBook Pro 15-inch Retina (Mid 2015) lower case are M1.6 in lengths from 2.3 to 3.1 mm.

The record covers lower-case screws in the M1.6 class, supplied in two lengths.

This entry is marked reported and comes from ifixit.com.

For reference, M1.6 is 1.6 mm across the threads at 0.35 mm pitch. The imperial size people confuse it with: #1-72 UNF (1.85 mm) is larger; there is no true imperial equivalent.

MacBook Pro 15-inch Retina (Mid 2015) lower case screw specifications

One row per fitment record. Head, drive are shown only where the source states them; pitch is the ISO coarse pitch for the thread.

Thread	Length	Pitch	Head	Drive	Where it goes	Status
M1.6	2.3–3.1 mm	0.35 mm	not stated	not stated	Lower-case screws in the M1.6 class, supplied in two lengths	Reported

Fitment records and sources

M1.62.3-3.1mmreported

Lower-case screws in the M1.6 class, supplied in two lengths

pitch 0.35 mm · tap 1.25 mm · clearance 1.8 mm · PH00 / Torx T4–T5

Source

How to check the screw before you buy

Laptop covers and brackets often mix two or three lengths of the same thread, so lay the screws out in the order they came out (a magnetic mat or a sheet of paper with the hole pattern drawn on it works).
Diameter: across the threads an M1.6 screw measures about 1.6 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
Pitch: 0.35 mm from one thread crest to the next (28.57 crests per centimetre). A thread pitch gauge or the pitch-gauge tool settles it in seconds.
Length: measure from under the head to the tip for pan, button, wafer and cap heads; countersunk (flat) heads are measured overall.
The records span 2.3–3.1 mm, which means different positions take different lengths — match each hole to its own screw.
Driver: the source does not name the drive. Standard M1.6 heads take PH00 for Phillips and T4–T5 for Torx, and a 1.5 mm hex key for socket heads; a bit that fits loosely will cam out and strip the head.
Tightening: no device-specific torque is published in these records. The site's general figure for M1.6 is about 12-20 N·cm into metal threads and 6-10 N·cm into plastic bosses; snug it up and stop.

Pitch gauge · Screw size finder · Torque guide

Buy these screws at TechSpare Warehouse

In stock and shipped from South Carolina. Our black screws are Phillips wafer head (low profile); match the head style and length to the original before you order.

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The same screw also fits

Devices whose records share a thread with MacBook Pro 15-inch Retina (Mid 2015) lower case, closest length match first.

Framework Laptop 12 bezel and hinge fasteners also M1.6 × 2.3–3 mm
Dell XPS 14 9440 also M1.6 × 3 mm
Dell Pro Max 16 Premium MA16250 also M1.6 × 2.3 mm
Lenovo ThinkPad T14s 2-in-1 Gen 2 also M1.6 × 2.6 mm
HP 250R 15.6 inch G10 also M1.6 × 2.5 mm
Dell Inspiron 15 7500 Black 2-in-1 also M1.6 × 2.5 mm
HP mt46 Mobile Thin Client (id 37874521; MSG on PAGE 2) also M1.6 × 3 mm
Dell Inspiron 14 5406 2-in-1 also M1.6 × 2.5 mm

Questions about MacBook Pro 15-inch Retina (Mid 2015) lower case screws

What size screw does MacBook Pro 15-inch Retina (Mid 2015) lower case use?: M1.6 × 2.3–3.1 mm for lower-case screws in the M1.6 class, supplied in two lengths.
How long are the screws in MacBook Pro 15-inch Retina (Mid 2015) lower case?: The records range from 2.3 to 3.1 mm depending on the position, so match each screw to its own hole.
What is the thread pitch of an M1.6 screw?: 0.35 mm (coarse), which is the standard pitch for M1.6 machine screws; a 0.2 mm fine pitch exists but is uncommon. The tap drill is 1.25 mm and the normal clearance hole is 1.8 mm.
What screwdriver do I need for MacBook Pro 15-inch Retina (Mid 2015) lower case?: The sources do not name the drive. For M1.6, Phillips heads normally take PH00 and Torx heads T4–T5; socket heads take a 1.5 mm hex key.
Can I use an imperial screw instead of M1.6?: No. Imperial look-alike: #1-72 UNF (1.85 mm) is larger; there is no true imperial equivalent. Use a true M1.6 screw so it does not cross-thread or strip the hole.
Where can I buy replacement screws for MacBook Pro 15-inch Retina (Mid 2015) lower case?: TechSpareWarehouse (our own store) lists M1.6 x 3mm, which matches the length in the records above.

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