---
title: "Captive Panel Screws, Spring-Loaded"
description: "Captive Panel Screws, Spring-Loaded to Trade series (panel fastener): sizes M3 to M6, pitch 0.5-1 mm, head 8-14 mm. Technical drawing redraws to any row."
url: https://engineeringhardware.com/fastener/captive-panel-screws/
source: Engineering Hardware & Fasteners
---

# Captive Panel Screws, Spring-Loaded

Screws · Captive Panel Screws

6 catalogued sizes, dimensioned to Trade series (panel fastener). Pick any row and the technical drawing redraws to it.

Captive Panel Screws, Spring-Loaded to Trade series (panel fastener) are catalogued in sizes M3 to M6, with pitch 0.5-1 mm, head 8-14 mm, head h 3-4.5 mm. 6 sizes are held in the table below, and the technical drawing redraws to whichever row you select.

- **Standard:** Trade series (panel fastener)
- **Size range:** M3-M6
- **Pitch:** 0.5-1 mm
- **Head:** 8-14 mm
- **Catalogued sizes:** 6

Dimensions are nominal values from the governing standard. Confirm the tolerance class for your application before ordering.

![Captive Panel Screws, Spring-Loaded technical product image](https://engineeringhardware.com/wp-content/uploads/2026/08/Captive-Panel-Screws.webp)

Product catalog

## Related Captive Panel Screws products

[![60PCS Fender Outer Panel Fastener Clip Metal Car Bumper Mudguard Retainer](https://img.engineeringhardware.com/60PCS-Fender-Outer-Panel-Fastener-Clip-Metal-Car-Bumper-Mudguard-Retainer.webp)](https://engineeringhardware.com/product/60pcs-fender-outer-panel-fastener-clip-metal-car-bumper-mudguard-retainer/)

Quarter-Turn, Captive & Panel Fasteners

### [60PCS Fender Outer Panel Fastener Clip Metal Car Bumper Mudguard Retainer](https://engineeringhardware.com/product/60pcs-fender-outer-panel-fastener-clip-metal-car-bumper-mudguard-retainer/)

Auto Clips · Colorful

**US$3.60 – 4.80**MOQ 10 sets

[![Universal Solar Panel Fasteners Suit Rooftop and Ground Solar Projects](https://img.engineeringhardware.com/Universal-Solar-Panel-Fasteners-Suit-Rooftop-and-Ground-Solar-Projects.webp)](https://engineeringhardware.com/product/universal-solar-panel-fasteners-suit-rooftop-and-ground-solar-projects/)

Quarter-Turn, Captive & Panel Fasteners

### [Universal Solar Panel Fasteners Suit Rooftop and Ground Solar Projects](https://engineeringhardware.com/product/universal-solar-panel-fasteners-suit-rooftop-and-ground-solar-projects/)

Standard · Aluminum

**US$0.74 – 0.98**MOQ 100 pieces

[![Factory Price Trox Round Head Self Tapping Loose Bolt M6 Black Captive Bolt](https://img.engineeringhardware.com/Factory-Price-Trox-Round-Head-Self-Tapping-Loose-Bolt-M6-Black-Captive-Bolt.webp)](https://engineeringhardware.com/product/factory-price-trox-round-head-self-tapping-loose-bolt-m6-black-captive-bolt/)

Quarter-Turn, Captive & Panel Fasteners

### [Factory Price Trox Round Head Self Tapping Loose Bolt M6 Black Captive Bolt](https://engineeringhardware.com/product/factory-price-trox-round-head-self-tapping-loose-bolt-m6-black-captive-bolt/)

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

**US$0.072 – 0.18**MOQ 100 pieces

[![Made in China Automotive Plastic Trim Removable Decorative Panel Fasteners Plastic Clips for Cars Auto Plastic Clips and Fasteners](https://img.engineeringhardware.com/Made-in-China-Automotive-Plastic-Trim-Removable-Decorative-Panel-Fasteners-Plastic-Clips-for-Cars-Auto-Plastic-Clips-and-Fasteners.webp)](https://engineeringhardware.com/product/made-in-china-automotive-plastic-trim-removable-decorative-panel-fasteners-plastic/)

Quarter-Turn, Captive & Panel Fasteners

### [Made in China Automotive Plastic Trim Removable Decorative Panel Fasteners Plastic Clips for Cars Auto Plastic Clips and Fasteners](https://engineeringhardware.com/product/made-in-china-automotive-plastic-trim-removable-decorative-panel-fasteners-plastic/)

Plastic · Bulk

**US$0.12 – 1.20**MOQ 1,000 pieces

[![Stainless Steel Knurled Captive Thumb Screw](https://img.engineeringhardware.com/Stainless-Steel-Knurled-Captive-Thumb-Screw.webp)](https://engineeringhardware.com/product/stainless-steel-knurled-captive-thumb-screw/)

Quarter-Turn, Captive & Panel Fasteners

### [Stainless Steel Knurled Captive Thumb Screw](https://engineeringhardware.com/product/stainless-steel-knurled-captive-thumb-screw/)

Round Head · DIN, ANSI, GB, JIS

**US$0.048 – 6.00**MOQ 100 pieces

[![Stainless Steel Fastener 2-56 4-40 6-32 8-32 10-24 1/4-20 Half Threaded Hex Drive Socket Head Captive Panel Screws](https://img.engineeringhardware.com/Stainless-Steel-Fastener-2-56-4-40-6-32-8-32-10-24-1-4-20-Half-Threaded-Hex-Drive-Socket-Head-Captive-Panel-Screws.webp)](https://engineeringhardware.com/product/stainless-steel-fastener-2-56-4-40-6-32-8-32-10-24-1-4-20-half-threaded-hex-drive/)

Quarter-Turn, Captive & Panel Fasteners

### [Stainless Steel Fastener 2-56 4-40 6-32 8-32 10-24 1/4-20 Half Threaded Hex Drive Socket Head Captive Panel Screws](https://engineeringhardware.com/product/stainless-steel-fastener-2-56-4-40-6-32-8-32-10-24-1-4-20-half-threaded-hex-drive/)

Socket Head · ANSI, Thread Forming Screw

**US$0.048 – 0.06**MOQ 1,000 pieces

[View all Quarter-Turn, Captive & Panel Fasteners →](https://engineeringhardware.com/fastener-products/specialty-fasteners/quarter-turn-captive-panel-fasteners/) [Full product catalog](https://engineeringhardware.com/products/)

## Materials & Grades

Select a material class to see the grades we supply it in. Each designation is listed with its ISO/EN, AISI/SAE, JIS and GB equivalents.

Stainless Steel38 Carbon Steel66 Alloy Steel41 Bearing Steel5 Spring Steel25 Aluminum and Aluminum Alloys21 Brass17 Bronze11 Copper8 Titanium and Titanium Alloys18 Nickel and Nickel Alloys22 Iron-Nickel and High-Temperature Alloys10 Tool Steel and Specialty Hardened Steel9 Structural and Construction Steel9

### Stainless Steel

#### Austenitic Stainless Steel

- A1 AISI 303 · SAE 303 · SUS303 · EN 1.4305 · X8CrNiS18-9
- A2 AISI 304 · SAE 304 · SUS304 · EN 1.4301 · X5CrNi18-10 · 06Cr19Ni10
- 304L AISI 304L · SUS304L · EN 1.4307 · X2CrNi18-9 · 022Cr19Ni10
- 302 AISI 302 · SUS302 · EN 1.4310
- 305 AISI 305 · SUS305 · EN 1.4303
- A4 AISI 316 · SAE 316 · SUS316 · EN 1.4401 · X5CrNiMo17-12-2 · 06Cr17Ni12Mo2
- 316L AISI 316L · SUS316L · EN 1.4404 · X2CrNiMo17-12-2 · 022Cr17Ni12Mo2
- 321 AISI 321 · SUS321 · EN 1.4541 · X6CrNiTi18-10
- 310 / 310S AISI 310 · AISI 310S · SUS310S · EN 1.4845
- 302HQ AISI 302HQ
- A3
- A5
- 347 AISI 347 · SUS347 · EN 1.4550 · X6CrNiNb18-10
- 309 / 309S AISI 309 · AISI 309S · SUS309S

#### Martensitic Stainless Steel

- AISI 410 SUS410 · EN 1.4006 · X12Cr13 · 12Cr13
- AISI 420 SUS420J1 · SUS420J2 · EN 1.4021 · EN 1.4028 · 20Cr13 · 30Cr13
- AISI 431 SUS431 · EN 1.4057 · X17CrNi16-2
- C1
- C3
- C4
- AISI 440A
- AISI 440B
- AISI 440C SUS440C · EN 1.4125

#### Ferritic Stainless Steel

- AISI 430 SUS430 · EN 1.4016 · X6Cr17 · 10Cr17
- F1
- AISI 434
- AISI 444

#### Precipitation-Hardening Stainless Steel

- 17-4 PH AISI 630 · UNS S17400 · SUS630 · EN 1.4542 · X5CrNiCuNb16-4
- 15-5 PH UNS S15500
- 17-7 PH UNS S17700

#### Duplex and Super Duplex Stainless Steel

- Duplex 2205 UNS S31803 · UNS S32205 · EN 1.4462
- Super Duplex 2507 UNS S32750 · EN 1.4410
- D2
- D4
- D6
- D8
- Lean Duplex 2101 UNS S32101
- Super Duplex S32760 UNS S32760 · EN 1.4501

### Carbon Steel

#### Low-Carbon Steel

- SAE 1006
- SAE 1008
- SAE 1010
- SAE 1018
- SAE 1020
- Q195
- Q235
- SAE 1012
- SAE 1015
- Q215
- ML08
- ML08Al
- ML10
- ML15
- ML20
- SWRCH6A
- SWRCH8A
- SWRCH10A
- SWRCH12A
- SWRCH15A
- SWRCH18A

#### Medium-Carbon Steel

- SAE 1035
- SAE 1045
- S45C
- C45
- SAE 1030
- SAE 1040
- SAE 1050
- 30
- 35
- 40
- 45
- 50
- S35C
- S40C
- S50C
- C35
- C40

#### High-Carbon Steel

- SAE 1060
- SAE 1070
- 65Mn
- SAE 1065
- SAE 1075
- SAE 1080
- SAE 1085
- SAE 1090
- SAE 1095
- 60
- 65
- 70
- 75
- 80
- 85

#### Cold-Heading Steel

- SWRCH22A
- 10B21
- SWRCH22K
- SWRCH25K
- SWRCH30K
- SWRCH35K
- SWRCH40K
- ML20Mn
- ML25
- ML30
- ML35
- ML40
- 15B25

### Alloy Steel

#### Chromium Steel

- 40Cr
- 45Cr
- AISI 5140
- SAE 5140
- AISI 5120
- SAE 5120
- SCr420
- SCr440

#### Chromium-Molybdenum Steel

- 35CrMo
- 42CrMo
- AISI 4140
- SCM435
- SCM440
- 42CrMo4
- 30CrMo
- AISI 4130
- SAE 4130
- SAE 4140
- AISI 4142
- AISI 4145
- SCM415
- SCM420
- SCM445
- EN 1.7220
- EN 1.7225
- 25CrMo4
- 34CrMo4

#### Nickel-Chromium-Molybdenum Steel

- AISI 4340
- SAE 4340
- 40CrNiMo
- SNCM439
- EN 1.6511
- 36CrNiMo4

#### Boron Alloy Steel

- 10B22
- 10B21
- 15B21
- 15B25
- 20MnTiB
- 20Mn2B
- 35VB
- 40MnB

### Bearing Steel

#### Bearing Steel

- GCr15
- AISI 52100 SAE 52100 · UNS G52986
- SUJ2
- 100Cr6 EN 1.3505
- GCr15SiMn

### Spring Steel

#### Carbon Spring Steel

- SAE 1065
- SAE 1070
- SAE 1075
- SAE 1080
- SAE 1095
- 65
- 70
- 75
- 80
- 65Mn

#### Silicon-Manganese Spring Steel

- 60Si2Mn
- 60Si2MnA
- SUP6
- SUP7

#### Chromium-Vanadium Spring Steel

- 50CrVA
- SAE 6150
- AISI 6150
- SUP10

#### Stainless Spring Steel

- AISI 301
- SUS301
- EN 1.4310
- AISI 302
- AISI 304
- AISI 316
- 17-7 PH

### Aluminum and Aluminum Alloys

#### Commercially Pure Aluminum

- 1050
- 1060
- 1070
- 1100

#### 2xxx Series Aluminum

- 2024
- 2011
- 2014
- 2017

#### 5xxx Series Aluminum

- 5052
- 5083
- 5754

#### 6xxx Series Aluminum

- 6061
- 6061-T6
- 6063
- 6082
- 6082-T6

#### 7xxx Series Aluminum

- 7075
- 7075-T6
- 7005
- 7050
- 7075-T73

### Brass

#### Free-Cutting Brass

- C36000
- H62
- HPb59-1
- C3601
- C3602
- C3604
- CuZn36Pb3
- CuZn39Pb3
- EN CW614N
- EN CW617N
- H65

#### Lead-Free Brass

- C69300
- C27450
- CW510L
- CW511L

#### Naval Brass

- C46400
- CuZn39Sn1

### Bronze

#### Silicon Bronze

- C65500
- C65100
- C65600

#### Phosphor Bronze

- C51000
- C52100
- CuSn6
- CuSn8

#### Aluminum Bronze

- C95400
- C95500
- C63000
- CuAl10Ni5Fe4

### Copper

#### Copper

- C11000
- T2
- C10100
- C10200
- C12200
- T1
- TU1
- TU2

### Titanium and Titanium Alloys

#### Commercially Pure Titanium

- Grade 2
- Grade 1
- Grade 3
- Grade 4
- TA1
- TA2
- TA3

#### Alpha-Beta Titanium Alloys

- Grade 5
- Ti-6Al-4V
- TC4
- UNS R56400

#### Low-Interstitial Grade

- Grade 23
- Ti-6Al-4V ELI
- UNS R56407

#### Other Titanium Fastener Alloys

- Ti-6Al-6V-2Sn
- Ti-6Al-2Sn-4Zr-2Mo
- Beta-C titanium
- Ti-10V-2Fe-3Al

### Nickel and Nickel Alloys

#### Commercially Pure Nickel

- Nickel 200
- UNS N02200
- Nickel 201
- UNS N02201

#### Inconel Alloys

- Inconel 625 UNS N06625
- Inconel 718 UNS N07718
- Inconel 600 UNS N06600
- Inconel 601 UNS N06601
- Inconel 686 UNS N06686
- Inconel X-750 UNS N07750

#### Monel Alloys

- Monel 400 UNS N04400
- Monel K-500 UNS N05500

#### Hastelloy Alloys

- Hastelloy C-276 UNS N10276
- Hastelloy C-22 UNS N06022
- Hastelloy B-2 UNS N10665
- Hastelloy B-3 UNS N10675
- Hastelloy X UNS N06002

#### Other Nickel Alloys

- Alloy 20 UNS N08020
- Alloy 625
- Alloy 718
- Alloy 825 UNS N08825
- Alloy 925 UNS N09925

### Iron-Nickel and High-Temperature Alloys

#### A286

- A-286
- UNS S66286
- EN 1.4980

#### Invar

- Invar 36
- Alloy 36
- UNS K93600
- FeNi36

#### Alloy 42

- Alloy 42
- UNS K94100
- FeNi42

### Tool Steel and Specialty Hardened Steel

#### Tool Steel and Specialty Hardened Steel

- AISI D2
- AISI H13
- SKD11
- Cr12MoV
- AISI O1
- AISI A2
- AISI S7
- SKD61
- 9CrSi

### Structural and Construction Steel

#### Structural and Construction Steel

- ASTM A36
- Q235B
- Q355B
- S355JR
- Q235C
- Q355C
- S235JR
- S275JR
- S355J2

## Applications & Industries

Captive Panel Screws are bought for a small number of well-defined jobs. These are the ones we ship them for. Stocked from M3 to M6.

### Industries that specify Captive Panel Screws

- **Rack equipment & enclosures:** Front panels and service covers removed in the field.
- **Rotating machinery guards:** Covers where a dropped screw must never enter the machine.
- **Rail & transport interiors:** Access panels opened on a maintenance schedule.
- **Energy & infrastructure:** Tower, pipework, switchgear and plant fixings specified for long service life and inspectable joints.
- **Maintenance & MRO:** Stocked replacements matched to an existing property class, thread and finish.
- **Food, pharma & cleanroom:** Stainless assemblies that are washed down, where the finish matters as much as the strength.

![Captive Panel Screws in use — application photograph](https://engineeringhardware.com/wp-content/uploads/2026/08/Captive-Screws.webp)

### Typical applications

- assemblies where a lost screw is a safety or FOD issue
- panels opened repeatedly without loose hardware
- joints where the property class is stated on the drawing
- clamping two machined faces to a calculated preload
- bolting brackets, motors and gearboxes to a frame
- assemblies that are dismantled for service and re-torqued

### Service conditions to specify against

- **Marine and coastal:** Available in A4 (316) stainless for chloride exposure — coastal structures, pool halls, water treatment and deck hardware, where A2 will eventually pit.
- **High load:** Supplied in ISO 898-1 property classes, so the joint can be designed to a stated proof load and tightened to a calculated torque rather than by feel.
- **Torque and preload:** The joint is designed around bolt tension, so lubrication, coating and the friction coefficient all change the torque figure — state them together.

### Where to use something else

- Do not use a machine thread into unthreaded sheet or timber; use a tapping screw, rivet nut or insert made for that parent material.

[Full application guide: where Captive Panel Screws are used, how to specify them, and the cases they are wrong for](https://engineeringhardware.com/applications/captive-panel-screws/)

## Technical Drawing

Dimensioned line drawing of M3 Captive Panel Screws, Spring-Loaded to Trade series (panel fastener). Side view and top view, drawn to the dimensions in the table below and redrawn for any size selected.

- **Pitch (mm):** 0.5
- **Head diameter dk (mm):** 8.0
- **Head height k (mm):** 3.0
- **Panel hole (mm):** 4.2
- **Panel thickness (mm):** 0.8~1.5
- **Retracted travel (mm):** 4.0
- **Drive:** Slotted / PH1

## Dimensions & Specifications (Trade series (panel fastener))

Every row below is a starting point for the customizer above — pick any size and the drawing will redraw to that row.

| Thread size | Pitch (mm) | Head diameter dk (mm) | Head height k (mm) | Panel hole (mm) | Panel thickness (mm) | Retracted travel (mm) | Drive |
| --- | --- | --- | --- | --- | --- | --- | --- |
| [M3](https://engineeringhardware.com/guide/size/m3-captive-panel-screws/) | 0.5 | 8.0 | 3.0 | 4.2 | 0.8~1.5 | 4.0 | Slotted / PH1 |
| [M3](https://engineeringhardware.com/guide/size/m3-captive-panel-screws/) | 0.5 | 8.0 | 3.0 | 4.2 | 1.5~2.5 | 6.0 | Slotted / PH1 |
| [M4](https://engineeringhardware.com/guide/size/m4-captive-panel-screws/) | 0.7 | 10.0 | 3.5 | 5.3 | 0.8~1.5 | 5.0 | Slotted / PH2 |
| [M4](https://engineeringhardware.com/guide/size/m4-captive-panel-screws/) | 0.7 | 10.0 | 3.5 | 5.3 | 1.5~3.0 | 8.0 | Slotted / PH2 |
| [M5](https://engineeringhardware.com/guide/size/m5-captive-panel-screws/) | 0.8 | 12.0 | 4.0 | 6.4 | 1.5~3.0 | 8.0 | PH2 / TX20 |
| [M6](https://engineeringhardware.com/guide/size/m6-captive-panel-screws/) | 1.0 | 14.0 | 4.5 | 7.4 | 2.0~4.0 | 10.0 | PH3 / TX25 |

Captive Panel Screws, Spring-Loaded conform to Trade series (panel fastener). As screws, they are specified by the dimensions in the table below; this page also covers materials, finishes and typical uses.

## What Are Captive Panel Screws, Spring-Loaded?

Captive Panel Screws, Spring-Loaded are screws defined by Trade series (panel fastener). They are selected by thread size and the dimensional characteristics shown below, and are available in a range of materials and finishes to suit the application and environment.

## Materials & Finishes

Common materials include carbon steel (typically zinc plated or hot-dip galvanized), alloy steel in property classes 8.8, 10.9 and 12.9, and stainless steel A2 (304) or A4 (316) for corrosion resistance. Specify the material, property class and surface finish appropriate to your load and environment.

## Specification Guides

Each size, material and standard of Captive Panel Screws, Spring-Loaded has its own reference page with the figures for that one configuration.

## Goes With

Hardware commonly specified alongside Captive Panel Screws, Spring-Loaded.

## Pricing

Captive Panel Screws, Spring-Loaded are supplied to order. Pricing starts from approximately US$0.46 per piece for standard sizes in carbon steel; final pricing depends on size, material, finish and order quantity (MOQ applies). Submit your exact configuration with the quote form above.

Custom manufacturing · Made to drawing

## Need a captive panel screws, spring-loaded outside the standard range?

Lengths and thread lengths outside the standard table are the commonest request, followed by a drive the standard does not offer and a head marked with your own part number. 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)

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 standard are Captive Panel Screws, Spring-Loaded manufactured to?

Captive Panel Screws, Spring-Loaded are manufactured to Trade series (panel fastener). The dimensional values on this page follow that standard.

### Which sizes of Captive Panel Screws, Spring-Loaded does Engineering Hardware supply?

The table on this page lists 6 sizes for Captive Panel Screws, Spring-Loaded, ranging from M3 to M6. Sizes outside the table can be quoted on request.

### In which materials are Captive Panel Screws, Spring-Loaded supplied?

Captive Panel Screws, Spring-Loaded are supplied in alloy steel (typically 10.9 / 12.9 for socket screws), carbon steel and stainless A2 / A4, with finishes including zinc plating, hot-dip galvanizing and black oxide. Choose material and finish to suit the load and the service environment for Captive Panel Screws, Spring-Loaded.

### How do I request a quotation?

Use the parametric drawing on this page to set the exact configuration (size, material, finish) and click "Request this configuration" — a specialist from Engineering Hardware will respond within one business day.