---
title: "Drop-In Anchors (Internally Threaded)"
description: "Drop-In Anchors (Internally Threaded) to Trade series (displacement-controlled anchor): dia 8-20 mm, long 25-65 mm. Technical drawing redraws to any row."
url: https://engineeringhardware.com/fastener/drop-in-anchors/
source: Engineering Hardware & Fasteners
---

# Drop-In Anchors (Internally Threaded)

Anchors & Concrete Fixings · Drop-In Anchors

5 catalogued sizes, dimensioned to Trade series (displacement-controlled anchor). Pick any row and the technical drawing redraws to it.

Drop-In Anchors (Internally Threaded) to Trade series (displacement-controlled anchor) are catalogued in dia 8-20 mm, with long 25-65 mm. 5 sizes are held in the table below, and the technical drawing redraws to whichever row you select.

- **Standard:** Trade series (displacement-controlled anchor)
- **Dia:** 8-20 mm
- **Long:** 25-65 mm
- **Catalogued sizes:** 5

Dimensions are nominal values from the governing standard. Confirm the tolerance class for your application before ordering.

![Drop-In Anchors (Internally Threaded) technical product image](https://engineeringhardware.com/wp-content/uploads/2026/08/Drop-In-Anchors.webp)

Product catalog

## Related Drop-In Anchors products

[![Sokun Stainless Steel Galvanized Hook Fix Sleeve Drop in Anchor Heavy Anchor Bolt](https://img.engineeringhardware.com/Sokun-Stainless-Steel-Galvanized-Hook-Fix-Sleeve-Drop-in-Anchor-Heavy-Anchor-Bolt.webp)](https://engineeringhardware.com/product/sokun-stainless-steel-galvanized-hook-fix-sleeve-drop-in-anchor-heavy-anchor-bolt/)

Drop-In & Internal-Thread Anchors

### [Sokun Stainless Steel Galvanized Hook Fix Sleeve Drop in Anchor Heavy Anchor Bolt](https://engineeringhardware.com/product/sokun-stainless-steel-galvanized-hook-fix-sleeve-drop-in-anchor-heavy-anchor-bolt/)

Bonded Anchor Bolt · ANSI, BSW, DIN, GB, GOST

**US$1.20 – 12.00**MOQ 1,000 pieces

[![Grade 4.8 Stainless Steel 304 316 Drop in Anchor Concrete Expansion Anchor Bolt with Lip for Construction Building](https://img.engineeringhardware.com/Grade-4-8-Stainless-Steel-304-316-Drop-in-Anchor-Concrete-Expansion-Anchor-Bolt-with-Lip-for-Construction-Building.webp)](https://engineeringhardware.com/product/grade-4-8-stainless-steel-304-316-drop-in-anchor-concrete-expansion-anchor-bolt-with/)

Drop-In & Internal-Thread Anchors

### [Grade 4.8 Stainless Steel 304 316 Drop in Anchor Concrete Expansion Anchor Bolt with Lip for Construction Building](https://engineeringhardware.com/product/grade-4-8-stainless-steel-304-316-drop-in-anchor-concrete-expansion-anchor-bolt-with/)

Construction Bolt · ANSI, BSW, DIN, GB, JIS

**US$0.18 – 0.30**MOQ 1,000 pieces

[![M6-M8-M10-M12-M16-M20 Factory Direct Fastener M6-M24 Galvanized Expansion Anchor Bolt Drop in Anchor](https://img.engineeringhardware.com/M6-M8-M10-M12-M16-M20-Factory-Direct-Fastener-M6-M24-Galvanized-Expansion-Anchor-Bolt-Drop-in-Anchor.webp)](https://engineeringhardware.com/product/m6-m8-m10-m12-m16-m20-factory-direct-fastener-m6-m24-galvanized-expansion-anchor/)

Drop-In & Internal-Thread Anchors

### [M6-M8-M10-M12-M16-M20 Factory Direct Fastener M6-M24 Galvanized Expansion Anchor Bolt Drop in Anchor](https://engineeringhardware.com/product/m6-m8-m10-m12-m16-m20-factory-direct-fastener-m6-m24-galvanized-expansion-anchor/)

Stainless Steel · Zinc Yellow, Zinc Plant, HDG

**US$0.054 – 1.20**MOQ 1,000 pieces

[![High-Quality Copper Drop-in Anchor M10 Fastener for Secure Mounting](https://img.engineeringhardware.com/High-Quality-Copper-Drop-in-Anchor-M10-Fastener-for-Secure-Mounting.webp)](https://engineeringhardware.com/product/high-quality-copper-drop-in-anchor-m10-fastener-for-secure-mounting/)

Drop-In & Internal-Thread Anchors

### [High-Quality Copper Drop-in Anchor M10 Fastener for Secure Mounting](https://engineeringhardware.com/product/high-quality-copper-drop-in-anchor-m10-fastener-for-secure-mounting/)

Other · DIN

**Price on request**MOQ 200,000 pieces

[![Stainless Steel Heavy Duty Expansion Bolt Sleeve Cut Anchor Drop in Achor with Internal Thread Nut Plug](https://img.engineeringhardware.com/Stainless-Steel-Heavy-Duty-Expansion-Bolt-Sleeve-Cut-Anchor-Drop-in-Achor-with-Internal-Thread-Nut-Plug.webp)](https://engineeringhardware.com/product/stainless-steel-heavy-duty-expansion-bolt-sleeve-cut-anchor-drop-in-achor-with/)

Drop-In & Internal-Thread Anchors

### [Stainless Steel Heavy Duty Expansion Bolt Sleeve Cut Anchor Drop in Achor with Internal Thread Nut Plug](https://engineeringhardware.com/product/stainless-steel-heavy-duty-expansion-bolt-sleeve-cut-anchor-drop-in-achor-with/)

Undercut Anchor · DIN & ANSI & JIS & IFI

**US$0.12 – 0.16**MOQ 5,000 pieces

[![Premium Stainless Steel 304 and 316 Drop-in Anchors for Secure Fixing](https://img.engineeringhardware.com/Premium-Stainless-Steel-304-and-316-Drop-in-Anchors-for-Secure-Fixing.webp)](https://engineeringhardware.com/product/premium-stainless-steel-304-and-316-drop-in-anchors-for-secure-fixing/)

Drop-In & Internal-Thread Anchors

### [Premium Stainless Steel 304 and 316 Drop-in Anchors for Secure Fixing](https://engineeringhardware.com/product/premium-stainless-steel-304-and-316-drop-in-anchors-for-secure-fixing/)

SS304 · Stainless Steel

**US$0.012 – 0.06**MOQ 1,000 pieces

[View all Drop-In & Internal-Thread Anchors →](https://engineeringhardware.com/fastener-products/anchors-construction-fixings/drop-in-internal-thread-anchors/) [Full product catalog](https://engineeringhardware.com/products/)

## Materials & Grades

Select a material class to see the grades we supply it in. Each designation is listed with its ISO/EN, AISI/SAE, JIS and GB equivalents.

Stainless Steel38 Carbon Steel66 Alloy Steel41 Bearing Steel5 Spring Steel25 Aluminum and Aluminum Alloys21 Brass17 Bronze11 Copper8 Titanium and Titanium Alloys18 Nickel and Nickel Alloys22 Iron-Nickel and High-Temperature Alloys10 Tool Steel and Specialty Hardened Steel9 Structural and Construction Steel9

### Stainless Steel

#### Austenitic Stainless Steel

- A1 AISI 303 · SAE 303 · SUS303 · EN 1.4305 · X8CrNiS18-9
- A2 AISI 304 · SAE 304 · SUS304 · EN 1.4301 · X5CrNi18-10 · 06Cr19Ni10
- 304L AISI 304L · SUS304L · EN 1.4307 · X2CrNi18-9 · 022Cr19Ni10
- 302 AISI 302 · SUS302 · EN 1.4310
- 305 AISI 305 · SUS305 · EN 1.4303
- A4 AISI 316 · SAE 316 · SUS316 · EN 1.4401 · X5CrNiMo17-12-2 · 06Cr17Ni12Mo2
- 316L AISI 316L · SUS316L · EN 1.4404 · X2CrNiMo17-12-2 · 022Cr17Ni12Mo2
- 321 AISI 321 · SUS321 · EN 1.4541 · X6CrNiTi18-10
- 310 / 310S AISI 310 · AISI 310S · SUS310S · EN 1.4845
- 302HQ AISI 302HQ
- A3
- A5
- 347 AISI 347 · SUS347 · EN 1.4550 · X6CrNiNb18-10
- 309 / 309S AISI 309 · AISI 309S · SUS309S

#### Martensitic Stainless Steel

- AISI 410 SUS410 · EN 1.4006 · X12Cr13 · 12Cr13
- AISI 420 SUS420J1 · SUS420J2 · EN 1.4021 · EN 1.4028 · 20Cr13 · 30Cr13
- AISI 431 SUS431 · EN 1.4057 · X17CrNi16-2
- C1
- C3
- C4
- AISI 440A
- AISI 440B
- AISI 440C SUS440C · EN 1.4125

#### Ferritic Stainless Steel

- AISI 430 SUS430 · EN 1.4016 · X6Cr17 · 10Cr17
- F1
- AISI 434
- AISI 444

#### Precipitation-Hardening Stainless Steel

- 17-4 PH AISI 630 · UNS S17400 · SUS630 · EN 1.4542 · X5CrNiCuNb16-4
- 15-5 PH UNS S15500
- 17-7 PH UNS S17700

#### Duplex and Super Duplex Stainless Steel

- Duplex 2205 UNS S31803 · UNS S32205 · EN 1.4462
- Super Duplex 2507 UNS S32750 · EN 1.4410
- D2
- D4
- D6
- D8
- Lean Duplex 2101 UNS S32101
- Super Duplex S32760 UNS S32760 · EN 1.4501

### Carbon Steel

#### Low-Carbon Steel

- SAE 1006
- SAE 1008
- SAE 1010
- SAE 1018
- SAE 1020
- Q195
- Q235
- SAE 1012
- SAE 1015
- Q215
- ML08
- ML08Al
- ML10
- ML15
- ML20
- SWRCH6A
- SWRCH8A
- SWRCH10A
- SWRCH12A
- SWRCH15A
- SWRCH18A

#### Medium-Carbon Steel

- SAE 1035
- SAE 1045
- S45C
- C45
- SAE 1030
- SAE 1040
- SAE 1050
- 30
- 35
- 40
- 45
- 50
- S35C
- S40C
- S50C
- C35
- C40

#### High-Carbon Steel

- SAE 1060
- SAE 1070
- 65Mn
- SAE 1065
- SAE 1075
- SAE 1080
- SAE 1085
- SAE 1090
- SAE 1095
- 60
- 65
- 70
- 75
- 80
- 85

#### Cold-Heading Steel

- SWRCH22A
- 10B21
- SWRCH22K
- SWRCH25K
- SWRCH30K
- SWRCH35K
- SWRCH40K
- ML20Mn
- ML25
- ML30
- ML35
- ML40
- 15B25

### Alloy Steel

#### Chromium Steel

- 40Cr
- 45Cr
- AISI 5140
- SAE 5140
- AISI 5120
- SAE 5120
- SCr420
- SCr440

#### Chromium-Molybdenum Steel

- 35CrMo
- 42CrMo
- AISI 4140
- SCM435
- SCM440
- 42CrMo4
- 30CrMo
- AISI 4130
- SAE 4130
- SAE 4140
- AISI 4142
- AISI 4145
- SCM415
- SCM420
- SCM445
- EN 1.7220
- EN 1.7225
- 25CrMo4
- 34CrMo4

#### Nickel-Chromium-Molybdenum Steel

- AISI 4340
- SAE 4340
- 40CrNiMo
- SNCM439
- EN 1.6511
- 36CrNiMo4

#### Boron Alloy Steel

- 10B22
- 10B21
- 15B21
- 15B25
- 20MnTiB
- 20Mn2B
- 35VB
- 40MnB

### Bearing Steel

#### Bearing Steel

- GCr15
- AISI 52100 SAE 52100 · UNS G52986
- SUJ2
- 100Cr6 EN 1.3505
- GCr15SiMn

### Spring Steel

#### Carbon Spring Steel

- SAE 1065
- SAE 1070
- SAE 1075
- SAE 1080
- SAE 1095
- 65
- 70
- 75
- 80
- 65Mn

#### Silicon-Manganese Spring Steel

- 60Si2Mn
- 60Si2MnA
- SUP6
- SUP7

#### Chromium-Vanadium Spring Steel

- 50CrVA
- SAE 6150
- AISI 6150
- SUP10

#### Stainless Spring Steel

- AISI 301
- SUS301
- EN 1.4310
- AISI 302
- AISI 304
- AISI 316
- 17-7 PH

### Aluminum and Aluminum Alloys

#### Commercially Pure Aluminum

- 1050
- 1060
- 1070
- 1100

#### 2xxx Series Aluminum

- 2024
- 2011
- 2014
- 2017

#### 5xxx Series Aluminum

- 5052
- 5083
- 5754

#### 6xxx Series Aluminum

- 6061
- 6061-T6
- 6063
- 6082
- 6082-T6

#### 7xxx Series Aluminum

- 7075
- 7075-T6
- 7005
- 7050
- 7075-T73

### Brass

#### Free-Cutting Brass

- C36000
- H62
- HPb59-1
- C3601
- C3602
- C3604
- CuZn36Pb3
- CuZn39Pb3
- EN CW614N
- EN CW617N
- H65

#### Lead-Free Brass

- C69300
- C27450
- CW510L
- CW511L

#### Naval Brass

- C46400
- CuZn39Sn1

### Bronze

#### Silicon Bronze

- C65500
- C65100
- C65600

#### Phosphor Bronze

- C51000
- C52100
- CuSn6
- CuSn8

#### Aluminum Bronze

- C95400
- C95500
- C63000
- CuAl10Ni5Fe4

### Copper

#### Copper

- C11000
- T2
- C10100
- C10200
- C12200
- T1
- TU1
- TU2

### Titanium and Titanium Alloys

#### Commercially Pure Titanium

- Grade 2
- Grade 1
- Grade 3
- Grade 4
- TA1
- TA2
- TA3

#### Alpha-Beta Titanium Alloys

- Grade 5
- Ti-6Al-4V
- TC4
- UNS R56400

#### Low-Interstitial Grade

- Grade 23
- Ti-6Al-4V ELI
- UNS R56407

#### Other Titanium Fastener Alloys

- Ti-6Al-6V-2Sn
- Ti-6Al-2Sn-4Zr-2Mo
- Beta-C titanium
- Ti-10V-2Fe-3Al

### Nickel and Nickel Alloys

#### Commercially Pure Nickel

- Nickel 200
- UNS N02200
- Nickel 201
- UNS N02201

#### Inconel Alloys

- Inconel 625 UNS N06625
- Inconel 718 UNS N07718
- Inconel 600 UNS N06600
- Inconel 601 UNS N06601
- Inconel 686 UNS N06686
- Inconel X-750 UNS N07750

#### Monel Alloys

- Monel 400 UNS N04400
- Monel K-500 UNS N05500

#### Hastelloy Alloys

- Hastelloy C-276 UNS N10276
- Hastelloy C-22 UNS N06022
- Hastelloy B-2 UNS N10665
- Hastelloy B-3 UNS N10675
- Hastelloy X UNS N06002

#### Other Nickel Alloys

- Alloy 20 UNS N08020
- Alloy 625
- Alloy 718
- Alloy 825 UNS N08825
- Alloy 925 UNS N09925

### Iron-Nickel and High-Temperature Alloys

#### A286

- A-286
- UNS S66286
- EN 1.4980

#### Invar

- Invar 36
- Alloy 36
- UNS K93600
- FeNi36

#### Alloy 42

- Alloy 42
- UNS K94100
- FeNi42

### Tool Steel and Specialty Hardened Steel

#### Tool Steel and Specialty Hardened Steel

- AISI D2
- AISI H13
- SKD11
- Cr12MoV
- AISI O1
- AISI A2
- AISI S7
- SKD61
- 9CrSi

### Structural and Construction Steel

#### Structural and Construction Steel

- ASTM A36
- Q235B
- Q355B
- S355JR
- Q235C
- Q355C
- S235JR
- S275JR
- S355J2

## Applications & Industries

The sectors that buy Drop-In Anchors, and the duty each one buys them for. Stocked from M6 to M16.

### Industries that specify Drop-In Anchors

- **Fire protection:** Sprinkler pipe supports on concrete.
- **Building services:** Threaded rod hangers for tray, pipe and duct in a soffit.
- **Removable equipment:** Fixings taken off and put back without disturbing the anchor.
- **Fit-out & retrofit:** Fixings into existing concrete and masonry.
- **Building services:** Overhead threaded-rod hangers where the fixing has to be removable.
- **Plant & equipment:** Machines bolted down and lifted out again for service.

![Drop-In Anchors in use — application photograph](https://engineeringhardware.com/wp-content/uploads/2026/08/Female-Threaded-Anchors.webp)

### Typical applications

- must be set with its own setting tool before loading
- a flush internally threaded fixing in a concrete soffit
- bolts removed and replaced without disturbing the anchor
- a flush, internally threaded fixing point in concrete

### 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.
- **Setting:** A displacement-controlled anchor is only anchored once it has been set with its own tool — an unset one pulls straight out.

[Full application guide: where Drop-In Anchors are used, how to specify them, and the cases they are wrong for](https://engineeringhardware.com/applications/drop-in-anchors/)

## Technical Drawing

Dimensioned line drawing of M6 Drop-In Anchors (Internally Threaded) to Trade series (displacement-controlled anchor). Side view and top view, drawn to the dimensions in the table below and redrawn for any size selected.

- **Drill hole diameter (mm):** 8
- **Embedment depth (mm):** 25
- **Body length (mm):** 25
- **Setting tool required:** Yes
- **Flush with surface:** Yes
- **Material:** Zinc plated steel
- **Base material:** Concrete C20/25 and above

## Dimensions & Specifications (Trade series (displacement-controlled anchor))

Every row below is a starting point for the customizer above — pick any size and the drawing will redraw to that row.

| Internal thread | Drill hole diameter (mm) | Embedment depth (mm) | Body length (mm) | Setting tool required | Flush with surface | Material | Base material |
| --- | --- | --- | --- | --- | --- | --- | --- |
| [M6](https://engineeringhardware.com/guide/size/m6-drop-in-anchors/) | 8 | 25 | 25 | Yes | Yes | Zinc plated steel | Concrete C20/25 and above |
| [M8](https://engineeringhardware.com/guide/size/m8-drop-in-anchors/) | 10 | 30 | 30 | Yes | Yes | Zinc plated steel | Concrete C20/25 and above |
| [M10](https://engineeringhardware.com/guide/size/m10-drop-in-anchors/) | 12 | 40 | 40 | Yes | Yes | Zinc plated steel | Concrete C20/25 and above |
| [M12](https://engineeringhardware.com/guide/size/m12-drop-in-anchors/) | 16 | 50 | 50 | Yes | Yes | Zinc plated steel | Concrete C20/25 and above |
| [M16](https://engineeringhardware.com/guide/size/m16-drop-in-anchors/) | 20 | 65 | 65 | Yes | Yes | Zinc plated steel | Concrete C20/25 and above |

Drop-In Anchors (Internally Threaded) conform to Trade series (displacement-controlled anchor). As anchors & concrete fixings, they are specified by the dimensions in the table below; this page also covers materials, finishes and typical uses.

## What Are Drop-In Anchors (Internally Threaded)?

Drop-In Anchors (Internally Threaded) are anchors & concrete fixings defined by Trade series (displacement-controlled anchor). They are selected by thread size and the dimensional characteristics shown below, and are available in a range of materials and finishes to suit the application and environment.

## Materials & Finishes

Common materials include carbon steel (typically zinc plated or hot-dip galvanized), hardened or case-hardened steel where wear matters, and stainless steel A2 (304) or A4 (316) for corrosion resistance. Specify the material, hardness where relevant, and the surface finish appropriate to your application and environment.

## Specification Guides

Each size, material and standard of Drop-In Anchors (Internally Threaded) has its own reference page with the figures for that one configuration.

## Goes With

Hardware commonly specified alongside Drop-In Anchors (Internally Threaded).

## Pricing

Drop-In Anchors (Internally Threaded) are supplied to order. Pricing starts from approximately US$0.29 per piece for standard sizes in carbon steel; final pricing depends on size, material, finish and order quantity (MOQ applies). Submit your exact configuration with the quote form above.

Custom manufacturing · Made to drawing

## Need a drop-in anchors (internally threaded) outside the standard range?

A non-standard anchor & concrete fixing is quoted from the drawing; where one already exists in the catalog, the special is usually a variation on its tooling. Made by hot forging or thread rolling.

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

[Custom anchor & concrete fixing manufacturing](https://engineeringhardware.com/custom/anchors/)[Send a drawing](https://engineeringhardware.com/custom/anchors/#rfq)

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

### Which standard governs Drop-In Anchors (Internally Threaded)?

Drop-In Anchors (Internally Threaded) are manufactured to Trade series (displacement-controlled anchor). The dimensional values on this page follow that standard.

### What sizes are available for Drop-In Anchors (Internally Threaded)?

The table on this page lists 5 sizes for Drop-In Anchors (Internally Threaded), ranging from M6 to M16. Sizes outside the table can be quoted on request.

### In which materials are Drop-In Anchors (Internally Threaded) supplied?

Drop-In Anchors (Internally Threaded) are supplied in the material specified on the part drawing, with finishes including zinc plating, hot-dip galvanizing and black oxide. Choose material and finish to suit the load and the service environment for Drop-In Anchors (Internally Threaded).

### How do I request a quotation?

Use the parametric drawing on this page to set the exact configuration (size, material, finish) and click "Request this configuration" — a specialist from Engineering Hardware will respond within one business day.