Screws · Trade series (PEEK micro screws)

A4 (316) Stainless Steel PEEK Engineering Plastic Micro Countersunk Screws

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

A4 Stainless Steel PEEK Engineering Plastic Micro Countersunk Screws are supplied to ISO 3506 group A4 (316 / 1.4401), commonly supplied A4-80. Corrosion behaviour is superior, including marine and chloride environments, 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 specified for marine, coastal and chemical applications.

Grade: ISO 3506 group A4 (316 / 1.4401), commonly supplied A4-80
Corrosion resistance: Superior, including marine and chloride environments
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.

For peek engineering plastic micro countersunk screws in A4 Stainless Steel, the controlling selection factors are corrosion exposure, strength requirement and service temperature. The grade data for A4 Stainless Steel (ISO 3506 group A4 (316 / 1.4401), commonly supplied A4-80) is summarized below together with every size supplied.

Why Choose A4 Stainless Steel for PEEK Engineering Plastic Micro Countersunk Screws

Specified for marine, coastal and chemical applications. For peek engineering plastic micro countersunk screws, this matters when superior, including marine and chloride environments is the primary requirement.

Mechanical & Physical Properties

Grade designation	ISO 3506 group A4 (316 / 1.4401), commonly supplied A4-80
Magnetic response	Largely non-magnetic
Service temperature	approx. -200 °C to +400 °C, subject to the property class and the joint
Corrosion characteristic	Superior, including marine and chloride environments

Corrosion Behavior in Service

A4 (316) adds 2–3% molybdenum to the A2 (304) composition, which dramatically improves resistance to chloride-pitting corrosion. For PEEK Engineering Plastic Micro Countersunk Screws in marine, coastal, swimming-pool or food-processing environments, A4 is the default selection.

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.

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 A4 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

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Sends the selected values to the quote form below.

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Specification

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

Business Information

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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.

Full application guide: where PEEK Engineering Plastic Micro Countersunk Screws are used, how to specify them, and the cases they are wrong for

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

Are A4 Stainless Steel PEEK Engineering Plastic Micro Countersunk Screws magnetic?

A4 Stainless Steel PEEK Engineering Plastic Micro Countersunk Screws are largely non-magnetic.

What corrosion resistance do A4 Stainless Steel PEEK Engineering Plastic Micro Countersunk Screws offer?

A4 Stainless Steel PEEK Engineering Plastic Micro Countersunk Screws provide superior, including marine and chloride environments with a service range of approx. -200 °C to +400 °C, subject to the property class and the joint.

Should I choose A4 Stainless Steel or A2 (304) for PEEK Engineering Plastic Micro Countersunk Screws?

For PEEK Engineering Plastic Micro Countersunk Screws, A4 Stainless Steel suits general indoor and outdoor use; A2 (304) is preferred for marine, coastal and chemical environments. Choose by corrosion exposure first.

Can A4 Stainless Steel PEEK Engineering Plastic Micro Countersunk Screws gall during installation?

Yes — stainless on stainless is prone to thread galling under load, especially at smaller sizes. Use an anti-galling lubricant or wax thread compound, and slow the tightening rate where possible.

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.