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Screws · DIN 464 · Application guide

What Are Knurled Thumb Screws, High Type Used For?

Typical applications, the industries that specify knurled thumb screws, high type, and how to choose the right size, material and finish for the joint.

Knurled Thumb Screws, High Type are used for assemblies opened and closed by hand, where reaching for a tool would slow the operator down. They are manufactured to DIN 464, and selection is driven by the thread size, the fit and tolerance the assembly requires, and the service environment.

Primary duty
Assemblies opened and closed by hand, where reaching for a tool would slow the operator down
Governing standard
DIN 464
Thread size range
M1.6 to M10
Category
Screws

Application notes are general engineering guidance. Verify the property class and any approval requirement against your own design calculation.

What Are Knurled Thumb Screws, High Type Used For? application image

Application guide for Knurled Thumb Screws, High Type to DIN 464. The core duty of the type is assemblies opened and closed by hand, where reaching for a tool would slow the operator down. The typical industries, the how-to-specify checklist, assembly practice and the exclusion cases are set out below. Stocked across roughly M1.6 to M10, they cover general to heavy-duty work.

Typical Applications for Knurled Thumb Screws, High Type

The most common settings where these are specified:

  • General machine building: fastening covers, brackets, motors and sub-assemblies on production equipment.
  • Maintenance & repair (MRO): a stocked size for servicing existing plant where the original fastener spec must be matched.
  • Fabrication & metalwork: bench and on-site assembly of steel frames, enclosures and weldments.
  • Electronics & enclosures: mounting PCBs, panels and lids where the drive style and head height matter.
  • Appliances & consumer goods: high-volume assembly with power tools and consistent seating.

How to Specify Knurled Thumb Screws, High Type for Your Application

  • Size: Match the nominal size to the mating thread or hole. This product spans M1.6–M10; check the full table below for the exact dimensions of each size.
  • Drive & head: Pick the drive (socket, cross, slot) and head style for the tool access and seating surface; a recessed drive resists cam-out under power tools.
  • Environment: For damp, coastal or chemical exposure prefer A4/316 stainless or a suitable coating; indoors, plated steel or A2 is usually sufficient.
  • Standard: This product is supplied to DIN 464. Quoting the standard on your order guarantees interchangeable dimensions between suppliers.

Installation & Assembly Practice

  • Match the driver exactly to the recess (PH ≠ PZ; hex key sizes per ISO 2936) and keep the tool axial — side load is the main cause of stripped drives.
  • In tapped holes, engage a thread length of at least 1× the nominal diameter in steel, 2× in aluminum.
  • Set power tools to a torque that seats the head without embedding it into the mating surface.

Common Selection Mistakes with Knurled Thumb Screws, High Type

  • Under-sizing the drive for the installation torque — a small recess at high torque strips before the screw is seated.
  • Using a countersunk head in thin sheet where the countersink removes most of the load-bearing material.
  • Specifying stainless in high-strength duty: A2-70 is roughly class 7 steel, not a 10.9 substitute.

Where Knurled Thumb Screws, High Type Are Not the Right Choice

Not for high-preload structural joints (use a property-class bolt and nut), and not in thin sheet where a self-drilling or self-tapping type suits better.

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

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Specification
Business Information

Dimensions & Specifications (DIN 464)

SizePitch (mm)Head diameter dk (mm)Head height k (mm)Length l (mm)Reference standardNotes
M1.60.357.523~40DIN 464Knurled head, no drive u2014 hand tightened
M20.4924~40DIN 464Knurled head, no drive u2014 hand tightened
M2.50.45112.55~40DIN 464Knurled head, no drive u2014 hand tightened
M30.5122.56~40DIN 464Knurled head, no drive u2014 hand tightened
M3.50.61438~40DIN 464Knurled head, no drive u2014 hand tightened
M40.7163.58~40DIN 464Knurled head, no drive u2014 hand tightened
M50.820410~40DIN 464Knurled head, no drive u2014 hand tightened
M61.024512~40DIN 464Knurled head, no drive u2014 hand tightened
M81.2530616~40DIN 464Knurled head, no drive u2014 hand tightened
M101.536820~40DIN 464Knurled head, no drive u2014 hand tightened

Video: What Are Knurled Thumb Screws, High Type Used For? in use

Third-party video, selected automatically for this topic. It is not produced by Engineering Hardware and is not a specification source — use the tables on this page for dimensional data.

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
    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
    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
    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
    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 are Knurled Thumb Screws, High Type used for?

Assemblies opened and closed by hand, where reaching for a tool would slow the operator down. They are supplied to DIN 464.

Which industries use Knurled Thumb Screws, High Type?

They are commonly specified in fabrication & metalwork, electronics & enclosures and appliances & consumer goods, among other sectors.

How do I choose the right size of Knurled Thumb Screws, High Type?

Match the nominal size to the mating thread or hole. This product is available from M1.6 to M10; the full dimension table on this page lists each size.

What drive type do Knurled Thumb Screws, High Type use?

Drive depends on the head style — socket (hex key), cross (Phillips/Pozi) or slot. A recessed drive resists cam-out when driven with power tools; check the product head style on this page.

Can I get a quote for Knurled Thumb Screws, High Type in the size and material I need?

Yes. Use the technical drawing and quote form on this page to set the size and options, then send the exact configuration to our team for pricing and lead time.