---
title: "A2 (304) Stainless Steel Torx Countersunk Machine Screws"
description: "A2 (304) Stainless Steel Torx Countersunk Machine Screws (ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70): good general corrosion resistance."
url: https://engineeringhardware.com/guide/material/a2-stainless-steel-torx-countersunk-machine-screws/
source: Engineering Hardware & Fasteners
---

# A2 (304) Stainless Steel Torx Countersunk Machine Screws

Screws · ISO 14581

Mechanical properties, corrosion behaviour and the full dimensional range for this grade.

A2 Stainless Steel Torx Countersunk Machine Screws are supplied to ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70. Corrosion behaviour is good general corrosion resistance, the material is largely non-magnetic, and the usable service range is approx. -200 °C to +400 °C, subject to the property class and the joint. In practice this grade is the most common stainless group for indoor and general outdoor fasteners.

- **Grade:** ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70
- **Corrosion resistance:** Good general corrosion resistance
- **Magnetic response:** Largely non-magnetic
- **Service temperature:** approx. -200 °C to +400 °C, subject to the property class and the joint

Property values are typical for the grade. Certified mechanical test data is available on request for production orders.

![A2 (304) Stainless Steel Torx Countersunk Machine Screws reference image](https://engineeringhardware.com/wp-content/uploads/2026/06/084-Torx-Countersunk-Head-Screw-—-GB／T-2673-／-ISO-14583-Series-023-—-GB／T-2673-／-ISO-14583.webp)

Torx Countersunk Machine Screws manufactured in A2 Stainless Steel (ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70) are dimensioned to ISO 14581. The sections below give the mechanical and physical properties of the grade, its behavior in corrosive and elevated-temperature service, and the full size table.

## Why Choose A2 Stainless Steel for Torx Countersunk Machine Screws

The most common stainless group for indoor and general outdoor fasteners. For torx countersunk machine screws, this matters when good general corrosion resistance is the primary requirement.

## Mechanical & Physical Properties

| Grade designation | ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70 |
| --- | --- |
| Magnetic response | Largely non-magnetic |
| Service temperature | approx. -200 °C to +400 °C, subject to the property class and the joint |
| Corrosion characteristic | Good general corrosion resistance |

## Corrosion Behavior in Service

A2 (304) gives excellent atmospheric and most-water corrosion resistance and is the most common stainless for Torx Countersunk Machine Screws in indoor and general outdoor service. In chloride-bearing environments (marine air, road salt, swimming pools) consider stepping up to A4 (316).

## Comparable Grades

For Torx Countersunk Machine Screws, the alternative stainless grade is A4 (316). A2 (304) covers general indoor and outdoor service. A4 (316) adds molybdenum, which is what buys the chloride resistance for marine and de-icing-salt exposure. Where strength matters more than corrosion, plated alloy steel in class 8.8 or 10.9 is the swap to make.

## Using Stainless Fasteners in Aluminum

The galvanic couple here runs the wrong way: aluminum is the less noble metal, so it corrodes and the fastener does not. What governs the rate is the ratio of areas — a large anode and a small cathode is a tolerable combination, the reverse concentrates the attack into thin material around the hole. An isolating washer plus sealant breaks the circuit; where that is impractical, match the fastener to the substrate.

## Sizes of Torx Countersunk Machine Screws Available in A2 Stainless Steel

| Thread size | Pitch (mm) | Head diameter dk (mm) | Head height k (mm) | Drive size | Max torque (Nm, typical) | Common length range (mm) | Reference standard |
| --- | --- | --- | --- | --- | --- | --- | --- |
| M3 | 0.5 | 5.6 | 1.65 | T10 | 2.0 | 6~30 | ISO 14581 |
| M4 | 0.7 | 7.5 | 2.20 | T20 | 4.5 | 8~40 | ISO 14581 |
| M5 | 0.8 | 9.2 | 2.50 | T25 | 9.0 | 8~50 | ISO 14581 |
| M6 | 1.0 | 11.0 | 3.00 | T30 | 15.0 | 10~60 | ISO 14581 |
| M8 | 1.25 | 14.5 | 4.00 | T40 | 36.0 | 12~80 | ISO 14581 |
| M10 | 1.5 | 18.0 | 5.00 | T50 | 70.0 | 16~100 | ISO 14581 |

Dimensions are independent of the material: every size above is available in A2 Stainless Steel.

Custom manufacturing · Made to drawing

## Need this screw in a grade that is not listed?

A2 Stainless Steel is one of the grades the catalog describes. Material and finish are usually what drives a special — a grade the standard part is not stocked in, or a coating chosen against a salt-spray figure instead of a default. 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 M3 Torx Countersunk Machine Screws to ISO 14581. 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):** 5.6
- **Head height k (mm):** 1.65
- **Drive size:** T10
- **Max torque (Nm, typical):** 2.0
- **Common length range (mm):** 6~30

## Dimensions & Specifications (ISO 14581)

| Thread size | Pitch (mm) | Head diameter dk (mm) | Head height k (mm) | Drive size | Max torque (Nm, typical) | Common length range (mm) | Reference standard |
| --- | --- | --- | --- | --- | --- | --- | --- |
| M3 | 0.5 | 5.6 | 1.65 | T10 | 2.0 | 6~30 | ISO 14581 |
| M4 | 0.7 | 7.5 | 2.20 | T20 | 4.5 | 8~40 | ISO 14581 |
| M5 | 0.8 | 9.2 | 2.50 | T25 | 9.0 | 8~50 | ISO 14581 |
| M6 | 1.0 | 11.0 | 3.00 | T30 | 15.0 | 10~60 | ISO 14581 |
| M8 | 1.25 | 14.5 | 4.00 | T40 | 36.0 | 12~80 | ISO 14581 |
| M10 | 1.5 | 18.0 | 5.00 | T50 | 70.0 | 16~100 | ISO 14581 |

Product catalog

## Related Torx (Hexalobular) Screws products

[![Carbon Steel/Stainless Steel Slotted Flat Head Step Shoulder Screws / Dowel Screws](https://img.engineeringhardware.com/Carbon-Steel-Stainless-Steel-Slotted-Flat-Head-Step-Shoulder-Screws-Dowel-Screws.webp)](https://engineeringhardware.com/product/carbon-steel-stainless-steel-slotted-flat-head-step-shoulder-screws-dowel-screws/)

Countersunk & Flat-Head Machine Screws

### [Carbon Steel/Stainless Steel Slotted Flat Head Step Shoulder Screws / Dowel Screws](https://engineeringhardware.com/product/carbon-steel-stainless-steel-slotted-flat-head-step-shoulder-screws-dowel-screws/)

Round Head · DIN, Accrording to The Drawing or Samples.

**US$0.006 – 6.00**MOQ 50,000 pieces

[![DIN 7991 Socket Flat Cap Screw with Black Oxide for Machinery](https://img.engineeringhardware.com/DIN-7991-Socket-Flat-Cap-Screw-with-Black-Oxide-for-Machinery.webp)](https://engineeringhardware.com/product/din-7991-socket-flat-cap-screw-with-black-oxide-for-machinery/)

Countersunk & Flat-Head Machine Screws

### [DIN 7991 Socket Flat Cap Screw with Black Oxide for Machinery](https://engineeringhardware.com/product/din-7991-socket-flat-cap-screw-with-black-oxide-for-machinery/)

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

**US$0.13 – 0.26**MOQ 1,000 pieces

[![Custom Slotted Countersunk Head Fully Threaded Machine Screw for Machinery and Equipment](https://img.engineeringhardware.com/Custom-Slotted-Countersunk-Head-Fully-Threaded-Machine-Screw-for-Machinery-and-Equipment.webp)](https://engineeringhardware.com/product/custom-slotted-countersunk-head-fully-threaded-machine-screw-for-machinery-and/)

Countersunk & Flat-Head Machine Screws

### [Custom Slotted Countersunk Head Fully Threaded Machine Screw for Machinery and Equipment](https://engineeringhardware.com/product/custom-slotted-countersunk-head-fully-threaded-machine-screw-for-machinery-and/)

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

**US$0.60 – 1.80**MOQ 50,000 pieces

[![DIN964 A2-70 304 Stainless Steel Cross Recessed Phillips Drive Raised Countersunk Oval Head Machine Screw](https://img.engineeringhardware.com/DIN964-A2-70-304-Stainless-Steel-Cross-Recessed-Phillips-Drive-Raised-Countersunk-Oval-Head-Machine-Screw.webp)](https://engineeringhardware.com/product/din964-a2-70-304-stainless-steel-cross-recessed-phillips-drive-raised-countersunk/)

Countersunk & Flat-Head Machine Screws

### [DIN964 A2-70 304 Stainless Steel Cross Recessed Phillips Drive Raised Countersunk Oval Head Machine Screw](https://engineeringhardware.com/product/din964-a2-70-304-stainless-steel-cross-recessed-phillips-drive-raised-countersunk/)

Countersunk Head · DIN

**US$0.012 – 0.06**MOQ 1,000 pieces

[![Adjusting Gold Plated Flat Head Spade Head Thumb Racket Screws](https://img.engineeringhardware.com/Adjusting-Gold-Plated-Flat-Head-Spade-Head-Thumb-Racket-Screws.webp)](https://engineeringhardware.com/product/adjusting-gold-plated-flat-head-spade-head-thumb-racket-screws/)

Countersunk & Flat-Head Machine Screws

### [Adjusting Gold Plated Flat Head Spade Head Thumb Racket Screws](https://engineeringhardware.com/product/adjusting-gold-plated-flat-head-spade-head-thumb-racket-screws/)

Round Head · DIN

**US$0.024 – 0.036**MOQ 30,000 pieces

[![Hand Tighten Inner Hexagonal Imperial Countersunk Head Screw for Building/Car/Bridge](https://img.engineeringhardware.com/Hand-Tighten-Inner-Hexagonal-Imperial-Countersunk-Head-Screw-for-Building-Car-Bridge.webp)](https://engineeringhardware.com/product/hand-tighten-inner-hexagonal-imperial-countersunk-head-screw-for-building-car-bridge/)

Countersunk & Flat-Head Machine Screws

### [Hand Tighten Inner Hexagonal Imperial Countersunk Head Screw for Building/Car/Bridge](https://engineeringhardware.com/product/hand-tighten-inner-hexagonal-imperial-countersunk-head-screw-for-building-car-bridge/)

Hexagon Head · DIN, GB, ANSI, JIS

**US$0.0084 – 0.0156**MOQ 5,000 pieces

[View all Countersunk & Flat-Head Machine Screws →](https://engineeringhardware.com/fastener-products/screws/countersunk-flat-head-machine-screws/) [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

Where Torx Countersunk Machine Screws are used, and what decides the specification in each case. Stocked from M3 to M10.

### Industries that specify Torx Countersunk Machine Screws

- **Automotive assembly:** The default drive on most modern vehicle assembly.
- **Automated assembly:** Robot and driver lines where cam-out costs cycle time.
- **Electronics & appliances:** Small screws driven to a controlled torque.
- **Steel fabrication:** Bolted connections in frames, enclosures, walkways and weldments, on the bench and on site.
- **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.

### Typical applications

- roughly twice the torque of a Phillips of the same size
- transmitting torque with no axial cam-out component
- driving without down-force, so a robot arm can hold position
- 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 Torx Countersunk Machine Screws are used, how to specify them, and the cases they are wrong for](https://engineeringhardware.com/applications/torx-countersunk-machine-screws/)

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

### Can A2 Stainless Steel replace plated alloy steel structurally?

Only at the standard strength classes — A2-70 / A4-80 are roughly equivalent to class 7 steel; A4-100 reaches class 8.8. For class 10.9 or 12.9 strength, plated alloy steel is required.

### Are A2 Stainless Steel Torx Countersunk Machine Screws magnetic?

A2 Stainless Steel Torx Countersunk Machine Screws are largely non-magnetic.

### What corrosion resistance do A2 Stainless Steel Torx Countersunk Machine Screws offer?

A2 Stainless Steel Torx Countersunk Machine Screws provide good general corrosion resistance with a service range of approx. -200 °C to +400 °C, subject to the property class and the joint.

### Should I choose A2 Stainless Steel or A4 (316) for Torx Countersunk Machine Screws?

For Torx Countersunk Machine Screws, A2 Stainless Steel suits general indoor and outdoor use; A4 (316) is preferred for marine, coastal and chemical environments. Choose by corrosion exposure first.

### How do I request a quotation?

Use the technical drawing on this page to pick the exact configuration, then submit it with the quote form. We respond within one business day.

## Related Pages

[View the full Torx Countersunk Machine Screws page](https://engineeringhardware.com/fastener/torx-countersunk-machine-screws/)

### More Torx Countersunk Machine Screws Guides