Screws · Trade series (PEEK micro screws)

Property Class 12.9 Steel PEEK Engineering Plastic Micro Countersunk Screws

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

Property Class 12.9 Steel PEEK Engineering Plastic Micro Countersunk Screws are supplied to ISO 898-1 property class 12.9. Corrosion behaviour is requires plating or black-oxide protection, the material is magnetic, and the usable service range is commonly limited to approx. +300 °C; confirm against the coating and the load. In practice this grade is the highest common strength class, for high-load machine assembly.

Grade: ISO 898-1 property class 12.9
Corrosion resistance: Requires plating or black-oxide protection
Magnetic response: Magnetic
Service temperature: commonly limited to approx. +300 °C; confirm against the coating and the load

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

PEEK Engineering Plastic Micro Countersunk Screws manufactured in Property Class 12.9 Steel (ISO 898-1 property class 12.9) are dimensioned to Trade series (PEEK micro screws). 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 Property Class 12.9 Steel for PEEK Engineering Plastic Micro Countersunk Screws

The highest common strength class, for high-load machine assembly. For peek engineering plastic micro countersunk screws, this matters when requires plating or black-oxide protection is the primary requirement.

Mechanical & Physical Properties

Grade designation	ISO 898-1 property class 12.9
Magnetic response	Magnetic
Service temperature	commonly limited to approx. +300 °C; confirm against the coating and the load
Corrosion characteristic	Requires plating or black-oxide protection

Corrosion Behavior in Service

Carbon and alloy steel peek engineering plastic micro countersunk screws require a coating for corrosion protection. Zinc plating (with or without passivation) is the most common; hot-dip galvanizing is used for outdoor structural service; black-oxide is mainly a tarnish-prevention finish for tool-room use.

Comparable Grades

For PEEK Engineering Plastic Micro Countersunk Screws, class 8.8 is the comparable strength step. Move up when the joint preload approaches the proof load of the current class; move down when the joint is over-specified. For corrosion-critical service, switch to stainless A2 or A4.

Sizes of PEEK Engineering Plastic Micro Countersunk Screws Available in Property Class 12.9 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.

Request a Quote

The form below follows the current technical drawing configuration. Change the drawing values above and the request details update automatically.

Request a Quotation

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

Are Property Class 12.9 Steel PEEK Engineering Plastic Micro Countersunk Screws magnetic?

Property Class 12.9 Steel PEEK Engineering Plastic Micro Countersunk Screws are magnetic.

What corrosion resistance do Property Class 12.9 Steel PEEK Engineering Plastic Micro Countersunk Screws offer?

Property Class 12.9 Steel PEEK Engineering Plastic Micro Countersunk Screws provide requires plating or black-oxide protection with a service range of commonly limited to approx. +300 °C; confirm against the coating and the load.

When should I move from ISO 898-1 property class 12.9 to class 8.8 for PEEK Engineering Plastic Micro Countersunk Screws?

Step up to class 8.8 when the joint preload approaches the proof load of the current class. The higher class adds preload at the same diameter, often saving size and weight.

Is Property Class 12.9 Steel prone to hydrogen embrittlement?

Class 10.9 and above can be susceptible to hydrogen embrittlement when electroplated. Specify post-plating baking, or use mechanical-zinc / zinc-flake finishes which avoid the cathodic plating step.

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.