---
title: "What Are 4IP Internal Service Screws for Mobile Devices Used For?"
description: "4IP Internal Service Screws for Mobile Devices (Trade series (4IP service screws)) are used for replacing a model-specific internal or exterior service screw…"
url: https://engineeringhardware.com/applications/4ip-internal-service-screws-for-mobile-devices/
source: Engineering Hardware & Fasteners
---

# What Are 4IP Internal Service Screws for Mobile Devices Used For?

Screws · Trade series (4IP service screws) · Application guide

Typical applications, the industries that specify 4ip internal service screws for mobile devices, and how to choose the right size, material and finish for the joint.

4IP Internal Service Screws for Mobile Devices are used for replacing a model-specific internal or exterior service screw with the correct drive and under-head length. They are manufactured to Trade series (4IP service screws), and the choice of size, property class and finish is driven by the load in the joint and the environment it sits in.

- **Primary duty:** Replacing a model-specific internal or exterior service screw with the correct drive and under-head length
- **Governing standard:** Trade series (4IP service screws)
- **Category:** Screws

Application notes are general engineering guidance. Verify the property class and any approval requirement against your own design calculation.

![What Are 4IP Internal Service Screws for Mobile Devices Used For? application image](https://engineeringhardware.com/wp-content/uploads/2026/09/Apple-iPhone-Torx-Plus-4IP-Internal-Screws.webp)

4IP Internal Service Screws for Mobile Devices are used primarily for replacing a model-specific internal or exterior service screw with the correct drive and under-head length. This page lists the industries and assemblies where they are specified, the selection criteria that matter for each application, installation practice, and the cases where a different fastener type is the correct choice. Parts are supplied to Trade series (4IP service screws).

## Typical Applications for 4IP Internal Service Screws for Mobile Devices

The most common settings where these are specified:

- **Smartphone service:** 4IP screws are used at documented internal battery and camera-area positions.
- **Device refurbishment:** Position-specific head geometry is retained in replacement sets.
- **Electronics repair:** The Torx Plus recess gives the service tool a positive fit.
- **Mobile equipment labs:** Short internal screws fit around tightly packed components.

Product catalog

## Related Mobile Device Service Screws products

[![Self Drilling Tapping Screw Drywall Chipboard Furniture Screw](https://img.engineeringhardware.com/Self-Drilling-Tapping-Screw-Drywall-Chipboard-Furniture-Screw.webp)](https://engineeringhardware.com/product/self-drilling-tapping-screw-drywall-chipboard-furniture-screw/)

Self-Drilling & Tek Screws

### [Self Drilling Tapping Screw Drywall Chipboard Furniture Screw](https://engineeringhardware.com/product/self-drilling-tapping-screw-drywall-chipboard-furniture-screw/)

Hexagon Head With Flange · DIN, GB, ANSI

**US$0.036**MOQ 50 pieces

[![Stainless Steel 410 304 Hex Head Self Drilling Screw with EPDM Washer / Flange Head DIN7504K Roof Screws](https://img.engineeringhardware.com/Stainless-Steel-410-304-Hex-Head-Self-Drilling-Screw-with-EPDM-Washer-Flange-Head-DIN7504K-Roof-Screws.webp)](https://engineeringhardware.com/product/stainless-steel-410-304-hex-head-self-drilling-screw-with-epdm-washer-flange-head/)

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### [Stainless Steel 410 304 Hex Head Self Drilling Screw with EPDM Washer / Flange Head DIN7504K Roof Screws](https://engineeringhardware.com/product/stainless-steel-410-304-hex-head-self-drilling-screw-with-epdm-washer-flange-head/)

Hex Flange/Pan/Round/Flat/Countersunk Head · DIN, ANSI, JIS, ISO

**US$0.012 – 1.20**MOQ 1,000 pieces

[![6 Nibs Zinc Plated Cross Drive Flat Countersunk Csk Head SDS Tek Self-Drilling Self Drilling Screws with Wing](https://img.engineeringhardware.com/6-Nibs-Zinc-Plated-Cross-Drive-Flat-Countersunk-Csk-Head-SDS-Tek-Self-Drilling-Self-Drilling-Screws-with-Wing.webp)](https://engineeringhardware.com/product/6-nibs-zinc-plated-cross-drive-flat-countersunk-csk-head-sds-tek-self-drilling-self/)

Self-Drilling & Tek Screws

### [6 Nibs Zinc Plated Cross Drive Flat Countersunk Csk Head SDS Tek Self-Drilling Self Drilling Screws with Wing](https://engineeringhardware.com/product/6-nibs-zinc-plated-cross-drive-flat-countersunk-csk-head-sds-tek-self-drilling-self/)

Round Head · DIN, ANSI

**US$1,080 – 1,679**MOQ 1 ton

[![Customized Cadmium Plated Zinc-Aluminum Coated Cheese Binding Countersunk Diameter M2.9-M6.3 Stainless Steel Self Drilling Screw](https://img.engineeringhardware.com/Customized-Cadmium-Plated-Zinc-Aluminum-Coated-Cheese-Binding-Countersunk-Diameter-M2-9-M6-3-Stainless-Steel-Self-Drilling-Screw.webp)](https://engineeringhardware.com/product/customized-cadmium-plated-zinc-aluminum-coated-cheese-binding-countersunk-diameter/)

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### [Customized Cadmium Plated Zinc-Aluminum Coated Cheese Binding Countersunk Diameter M2.9-M6.3 Stainless Steel Self Drilling Screw](https://engineeringhardware.com/product/customized-cadmium-plated-zinc-aluminum-coated-cheese-binding-countersunk-diameter/)

Customized · DIN, GB, ANSI, JIS, ASTM

**US$0.0012 – 0.06**MOQ 1,000 pieces

[![Countersunk Head Zinc Plated Cross Drive Self Drilling Screw with Wing](https://img.engineeringhardware.com/Countersunk-Head-Zinc-Plated-Cross-Drive-Self-Drilling-Screw-with-Wing.webp)](https://engineeringhardware.com/product/countersunk-head-zinc-plated-cross-drive-self-drilling-screw-with-wing/)

Self-Drilling & Tek Screws

### [Countersunk Head Zinc Plated Cross Drive Self Drilling Screw with Wing](https://engineeringhardware.com/product/countersunk-head-zinc-plated-cross-drive-self-drilling-screw-with-wing/)

Self Drilling · DIN, GB, GOST

**US$1,236 – 1,296**MOQ 1 ton

[![Factory Direct Sales Carbon Steel 410 Hexagon Head Building Roof Tek Screw Self-Drill Screws with Bonded EPDM Rubber Gaskets](https://img.engineeringhardware.com/Factory-Direct-Sales-Carbon-Steel-410-Hexagon-Head-Building-Roof-Tek-Screw-Self-Drill-Screws-with-Bonded-EPDM-Rubber-Gaskets.webp)](https://engineeringhardware.com/product/factory-direct-sales-carbon-steel-410-hexagon-head-building-roof-tek-screw-self/)

Self-Drilling & Tek Screws

### [Factory Direct Sales Carbon Steel 410 Hexagon Head Building Roof Tek Screw Self-Drill Screws with Bonded EPDM Rubber Gaskets](https://engineeringhardware.com/product/factory-direct-sales-carbon-steel-410-hexagon-head-building-roof-tek-screw-self/)

Hexagon Head · DIN, GB, ANSI, BSW, JIS, GOST

**US$0.06**MOQ 1,000 pieces

[View all Self-Drilling & Tek Screws →](https://engineeringhardware.com/fastener-products/screws/self-drilling-tek-screws/) [Full product catalog](https://engineeringhardware.com/products/)

## How to Specify 4IP Internal Service Screws for Mobile Devices for Your Application

- **Size:** Match the size to the mating part — see the dimension table below for each option.
- **Drive & head:** Pick the drive (socket, cross, slot) and head style for the tool access and seating surface; a recessed drive resists cam-out under power tools.
- **Environment:** For damp, coastal or chemical exposure prefer A4/316 stainless or a suitable coating; indoors, plated steel or A2 is usually sufficient.
- **Standard:** This product is supplied to Trade series (4IP service screws). Quoting the standard on your order guarantees interchangeable dimensions between suppliers.

## Installation & Assembly Practice

- Match the driver exactly to the recess (PH ≠ PZ; hex key sizes per ISO 2936) and keep the tool axial — side load is the main cause of stripped drives.
- In tapped holes, engage a thread length of at least 1× the nominal diameter in steel, 2× in aluminum.
- Set power tools to a torque that seats the head without embedding it into the mating surface.

## Common Selection Mistakes with 4IP Internal Service Screws for Mobile Devices

- Under-sizing the drive for the installation torque — a small recess at high torque strips before the screw is seated.
- Using a countersunk head in thin sheet where the countersink removes most of the load-bearing material.
- Specifying stainless in high-strength duty: A2-70 is roughly class 7 steel, not a 10.9 substitute.

## Where 4IP Internal Service Screws for Mobile Devices Are Not the Right Choice

Not for high-preload structural joints (use a property-class bolt and nut), and not in thin sheet where a self-drilling or self-tapping type suits better.

Custom manufacturing · Made to drawing

## Need a 4IP internal service screws for mobile devices outside the standard range?

Head form and drive can be specified to the assembly rather than to a standard: a larger bearing face, a security drive, or a socket sized for the tool already on the bench. Made by cold heading or warm forging.

Minimum order from 2,000 pieces; samples within 7 days of drawing approval.

[Custom screw manufacturing](https://engineeringhardware.com/custom/screws/)[Send a drawing](https://engineeringhardware.com/custom/screws/#rfq)

## Technical Drawing

Dimensioned line drawing of battery / rear-camera area 4IP Internal Service Screws for Mobile Devices to Trade series (4IP service screws). Side view and top view, drawn to the dimensions in the table below and redrawn for any size selected.

- **Drive:** four-lobe 4IP
- **Length:** model-specific
- **Head geometry:** position-specific
- **Selection rule:** use the model-matched replacement set

## Dimensions & Specifications (Trade series (4IP service screws))

| Service position | Drive | Length | Head geometry | Selection rule |
| --- | --- | --- | --- | --- |
| battery / rear-camera area | four-lobe 4IP | model-specific | position-specific | use the model-matched replacement set |

Inside the plant

## Manufactured in our own plant

This part is cold-formed, threaded, heat-treated and finished in-house. The stages below are where its class and finish are actually decided.

1. ![Wire rod feeding into a cold heading machine](https://engineeringhardware.com/wp-content/uploads/2026/08/09-wire-rod-feed-cold-heading-machine.webp) 01 **Cold heading** Wire rod is drawn to size and cold-formed into blanks. Forming rather than cutting keeps the grain flow continuous around the head, which is where a bolt is most likely to fail. Head dimensions and under-head radius checked at set-up and per shift.
2. ![Thread rolling machine producing bolt threads](https://engineeringhardware.com/wp-content/uploads/2026/08/03-thread-rolling-machine-bolt-production.webp) 02 **Thread rolling** Threads are rolled between hardened dies rather than cut. Rolled threads are stronger in fatigue than cut threads and hold pitch and flank angle far more consistently across a batch. Go / no-go ring gauges to ISO 965 tolerance class 6g.
3. ![Baskets of bolts staged for heat treatment](https://engineeringhardware.com/wp-content/uploads/2026/08/05-heat-treatment-baskets-black-bolts.webp) 03 **Heat treatment** Quench-and-temper brings carbon and alloy steel to the property class ordered — 8.8, 10.9 or 12.9 — with the furnace charge tracked so a finished lot can be traced back to it. Core hardness and tensile tested per lot to ISO 898-1.
4. ![Zinc plated bolts in a treatment basket](https://engineeringhardware.com/wp-content/uploads/2026/08/23-zinc-plated-bolts-treatment-basket.webp) 04 **Surface treatment** Zinc, zinc-nickel, hot-dip galvanizing, black oxide, phosphate and Dacromet, selected against the service environment rather than against the price list. Coating thickness and neutral salt spray hours to ISO 9227.

## Frequently Asked Questions

### What material should 4IP Internal Service Screws for Mobile Devices be for outdoor use?

For damp, coastal or chemical environments specify A4 (316) stainless or a suitably coated steel. For indoor or dry use, A2 (304) stainless or zinc-plated steel is normally adequate.

### Are 4IP Internal Service Screws for Mobile Devices made to a recognized standard?

Yes — they are manufactured to Trade series (4IP service screws), so dimensions are interchangeable between suppliers when you quote the standard on your order.

### What are 4IP Internal Service Screws for Mobile Devices used for?

Replacing a model-specific internal or exterior service screw with the correct drive and under-head length. They are supplied to Trade series (4IP service screws).

### Which industries use 4IP Internal Service Screws for Mobile Devices?

They are commonly specified in smartphone service, device refurbishment and electronics repair, among other sectors.

### Can I get a quote for 4IP Internal Service Screws for Mobile Devices in the size and material I need?

Yes. Use the technical drawing and quote form on this page to set the size and options, then send the exact configuration to our team for pricing and lead time.

## Related Pages

Product page: [4IP Internal Service Screws for Mobile Devices — specifications & sizes](https://engineeringhardware.com/fastener/4ip-internal-service-screws-for-mobile-devices/)

### 4IP Internal Service Screws for Mobile Devices Specification Guides

### Related Fastener Applications