---
title: "What Are Hand Tap Sets (Taper, Second and Plug) Used For?"
description: "Hand Tap Sets (Taper, Second and Plug) (DIN 352 (hand taps, set of three)) are used for installing, adjusting or servicing the assembly rather than forming p…"
url: https://engineeringhardware.com/applications/hand-tap-sets/
source: Engineering Hardware & Fasteners
---

# What Are Hand Tap Sets (Taper, Second and Plug) Used For?

Tools · DIN 352 (hand taps, set of three) · Application guide

Typical applications, the industries that specify hand tap sets (taper, second and plug), and how to choose the right size, material and finish for the joint.

Hand Tap Sets (Taper, Second and Plug) are used for installing, adjusting or servicing the assembly rather than forming part of it. They are manufactured to DIN 352 (hand taps, set of three), and selection is driven by the nominal size, the fit and tolerance the assembly requires, and the service environment.

- **Primary duty:** Installing, adjusting or servicing the assembly rather than forming part of it
- **Governing standard:** DIN 352 (hand taps, set of three)
- **Category:** Tools

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

![What Are Hand Tap Sets (Taper, Second and Plug) Used For? application image](https://engineeringhardware.com/wp-content/uploads/2026/09/Hand-Tap-Sets.webp)

Hand Tap Sets (Taper, Second and Plug) are selected when an assembly calls for installing, adjusting or servicing the assembly rather than forming part of it. This application guide to the DIN 352 (hand taps, set of three) type covers concrete end-uses, the specification checklist, correct installation, and where an alternative fastener performs better.

## Typical Applications for Hand Tap Sets (Taper, Second and Plug)

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.

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## How to Specify Hand Tap Sets (Taper, Second and Plug) for Your Application

- **Size:** Match the size to the mating part — see the dimension table below for each option.
- **Material:** Choose the material and finish for the service environment — plated steel for general use, stainless for corrosion resistance.
- **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 352 (hand taps, set of three). Quoting the standard on your order guarantees interchangeable dimensions between suppliers.

## Where Hand Tap Sets (Taper, Second and Plug) Are Not the Right Choice

Match the fastener to the load, environment and whether the joint must be reopened; the wrong class or style is the usual cause of joint failure.

Custom manufacturing · Made to drawing

## Need a hand tap sets (taper, second and plug) outside the standard range?

Dimensions, material, finish and form are specified from the drawing — a fastener tool outside the standard range is a variation on existing tooling rather than a new design.

Minimum order from 2,000 pieces; samples within 7 days of drawing approval.

[Custom fastener tool manufacturing](https://engineeringhardware.com/custom/tools/)[Send a drawing](https://engineeringhardware.com/custom/tools/#rfq)

## Technical Drawing

Dimensioned line drawing of taper (first) Hand Tap Sets (Taper, Second and Plug) to DIN 352 (hand taps, set of three). Side view and top view, drawn to the dimensions in the table below and redrawn for any size selected.

- **Lead (chamfered threads):** about 8 – 10 threads
- **Job in the sequence:** starts the thread square to the face
- **Blind hole:** cannot reach the bottom

## Dimensions & Specifications (DIN 352 (hand taps, set of three))

| Tap | Lead (chamfered threads) | Job in the sequence | Blind hole |
| --- | --- | --- | --- |
| taper (first) | about 8 – 10 threads | starts the thread square to the face | cannot reach the bottom |
| second (intermediate) | about 3 – 5 threads | cuts the working length of thread | cannot reach the bottom |
| plug (bottoming) | about 1 – 2 threads | finishes the thread to the hole bottom | this is the one that reaches |

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

### What are Hand Tap Sets (Taper, Second and Plug) used for?

Installing, adjusting or servicing the assembly rather than forming part of it. They are supplied to DIN 352 (hand taps, set of three).

### Which industries use Hand Tap Sets (Taper, Second and Plug)?

They are commonly specified in general machine building, maintenance & repair (mro) and fabrication & metalwork, among other sectors.

### How do I choose the right size of Hand Tap Sets (Taper, Second and Plug)?

Match the size to the mating part using the dimension table on this page.

### Are Hand Tap Sets (Taper, Second and Plug) made to a recognized standard?

Yes — they are manufactured to DIN 352 (hand taps, set of three), so dimensions are interchangeable between suppliers when you quote the standard on your order.

### Can I get a quote for Hand Tap Sets (Taper, Second and Plug) 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.

## Related Pages

Product page: [Hand Tap Sets (Taper, Second and Plug) — specifications & sizes](https://engineeringhardware.com/fastener/hand-tap-sets/)

### Hand Tap Sets (Taper, Second and Plug) Specification Guides

### Related Fastener Applications