Screws · Trade series (PEEK micro screws)

A2 (304) Stainless Steel PEEK Engineering Plastic Micro Countersunk Screws

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

A2 Stainless Steel PEEK Engineering Plastic Micro Countersunk 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 Stainless Steel PEEK Engineering Plastic Micro Countersunk Screws combine the dimensional form of Trade series (PEEK micro screws) with the material properties of grade ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70: good general corrosion resistance, largely non-magnetic, service range approx. -200 °C to +400 °C, subject to the property class and the joint. This page summarizes the grade data, its corrosion behavior in service, the comparable grades, and the sizes supplied.

Why Choose A2 Stainless Steel for PEEK Engineering Plastic Micro Countersunk Screws

The most common stainless group for indoor and general outdoor fasteners. For peek engineering plastic micro countersunk 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

Galvanic & Galling Considerations

Two important notes for stainless peek engineering plastic micro countersunk screws: (1) stainless can gall on stainless threads under load — use a thread lubricant or anti-galling compound, especially for M6 and below; (2) when joined to aluminum or galvanized steel, stainless can drive galvanic corrosion of the less-noble metal in wet service — isolate with a coating or sleeve where appropriate.

Comparable Grades

For PEEK Engineering Plastic Micro Countersunk 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

Expect the aluminum to corrode, not the fastener — stainless sits higher in the galvanic series, so the aluminum is the one that gives up material. A small fastener in a thick section spreads the loss over a large area and is usually fine; a large fastener in thin sheet concentrates it and is not. Keep water out of the joint, or isolate the two metals with a nylon or coated washer and a sealant.

Sizes of PEEK Engineering Plastic Micro Countersunk Screws Available in A2 Stainless Steel

Thread size	Example length (mm)	Head diameter (mm)	Drive	Material	Example tensile break load (N)	Example torsional break torque (Nu00b7m)
M1.2	2.5	2.3	cross recess No. 0	PEEK engineering plastic	58	0.03
M1.4		2.3	cross recess No. 0	PEEK engineering plastic
M1.6		2.3	cross recess No. 0	PEEK engineering plastic

Technical Drawing

Customize the parameters below — every spec field is editable, and the drawing redraws to match the values you choose. Changing the size will snap the other fields to that size's standard values; you can then override any individual value.

Sends the selected values to the quote form below.

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Specification

Item / category Standard Size(s) Material / finish Quantity

Business Information

Company * Contact Name * Email * Phone (with country code) Country / Region

Notes

Dimensions & Specifications (Trade series (PEEK micro screws))

Thread size	Example length (mm)	Head diameter (mm)	Drive	Material	Example tensile break load (N)	Example torsional break torque (Nu00b7m)
M1.2	2.5	2.3	cross recess No. 0	PEEK engineering plastic	58	0.03
M1.4		2.3	cross recess No. 0	PEEK engineering plastic
M1.6		2.3	cross recess No. 0	PEEK engineering plastic

Applications & Industries

PEEK Engineering Plastic Micro Countersunk Screws are bought for a small number of well-defined jobs. These are the ones we ship them for. Stocked from M1.2 to M1.6.

Industries that specify PEEK Engineering Plastic Micro Countersunk Screws

Prototype assemblies Countersunk plastic screws avoid a metal head near the component.
Insulated electronics Engineering-plastic screws provide a nonconductive threaded joint in a compact package.
Vacuum and analytical equipment Low-outgassing plastic is used around sensitive instruments.
Chemical equipment PEEK resists service environments where ordinary metal hardware may be unsuitable.
Automotive & transport Chassis, driveline and body fixings that see vibration and are assembled to a controlled preload.
Steel fabrication Bolted connections in frames, enclosures, walkways and weldments, on the bench and on site.

Typical applications

using the 90-degree head seat and No. 0 recess
providing electrical insulation with a miniature countersunk screw
checking the documented break loads instead of borrowing metal-screw torque
matching the plastic screw to the parent thread without over-driving it
joints where the property class is stated on the drawing
clamping two machined faces to a calculated preload

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 substitute metal-fastener torque for the plastic break-torque example; over-driving can fracture the screw.
Do not use a machine thread into unthreaded sheet or timber; use a tapping screw, rivet nut or insert made for that parent material.

Need help matching PEEK Engineering Plastic Micro Countersunk Screws to your application? Send the assembly, the load and the environment with your enquiry and we will specify the size, material and finish against them.

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.

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.
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.
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.
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's the service temperature limit for A2 Stainless Steel?

The practical service range is approx. -200 °C to +400 °C, subject to the property class and the joint.

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 PEEK Engineering Plastic Micro Countersunk Screws magnetic?

A2 Stainless Steel PEEK Engineering Plastic Micro Countersunk Screws are largely non-magnetic.

What corrosion resistance do A2 Stainless Steel PEEK Engineering Plastic Micro Countersunk Screws offer?

A2 Stainless Steel PEEK Engineering Plastic Micro Countersunk 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.

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.