---
title: "Split Nuts (Axially Slotted)"
description: "Split Nuts (Axially Slotted) to Trade series (split hex nut): sizes M8 to M20, pitch 1.25-2.5 mm, spanner 13-30 mm. Technical drawing redraws to any row."
url: https://engineeringhardware.com/fastener/split-nuts/
source: Engineering Hardware & Fasteners
---

# Split Nuts (Axially Slotted)

Nuts · Socket & Split Nuts

5 catalogued sizes, dimensioned to Trade series (split hex nut). Pick any row and the technical drawing redraws to it.

Split Nuts (Axially Slotted) to Trade series (split hex nut) are catalogued in sizes M8 to M20, with pitch 1.25-2.5 mm, spanner 13-30 mm, wide 14.38-33.53 mm. 5 sizes are held in the table below, and the technical drawing redraws to whichever row you select.

- **Standard:** Trade series (split hex nut)
- **Size range:** M8-M20
- **Pitch:** 1.25-2.5 mm
- **Spanner:** 13-30 mm
- **Catalogued sizes:** 5

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

![Split Nuts (Axially Slotted) technical product image](https://engineeringhardware.com/wp-content/uploads/2026/08/Split-Nuts.webp)

Product catalog

## Related Socket & Split Nuts products

[![Fine Pitch Thread Castle Nut in DIN935 Design](https://img.engineeringhardware.com/Fine-Pitch-Thread-Castle-Nut-in-DIN935-Design.webp)](https://engineeringhardware.com/product/fine-pitch-thread-castle-nut-in-din935-design/)

Slotted & Castle Nuts

### [Fine Pitch Thread Castle Nut in DIN935 Design](https://engineeringhardware.com/product/fine-pitch-thread-castle-nut-in-din935-design/)

Hexagon Head · DIN, ANSI, GB, JIS, GOST, BSW

**US$0.012**MOQ 50,000 pieces

[![DIN 935 ASME B18.2.2 ASME B18.2.4.3m M3-M100 Stainless Steel 304 316 Hex Slotted and Castle Nut A2-70A4-70 Customized Sizes](https://img.engineeringhardware.com/DIN-935-ASME-B18-2-2-ASME-B18-2-4-3m-M3-M100-Stainless-Steel-304-316-Hex-Slotted-and-Castle-Nut-A2-70A4-70-Customized-Sizes.webp)](https://engineeringhardware.com/product/din-935-asme-b18-2-2-asme-b18-2-4-3m-m3-m100-stainless-steel-304-316-hex-slotted-and-2/)

Slotted & Castle Nuts

### [DIN 935 ASME B18.2.2 ASME B18.2.4.3m M3-M100 Stainless Steel 304 316 Hex Slotted and Castle Nut A2-70A4-70 Customized Sizes](https://engineeringhardware.com/product/din-935-asme-b18-2-2-asme-b18-2-4-3m-m3-m100-stainless-steel-304-316-hex-slotted-and-2/)

Hexagon Head · DIN, ANSI, GB, BSW

**US$0.024**MOQ 10 pieces

[![Factory Price Grade 8.8 Hex Slotted Nut M6-M24 Black Oxide Castle Nut](https://img.engineeringhardware.com/Factory-Price-Grade-8-8-Hex-Slotted-Nut-M6-M24-Black-Oxide-Castle-Nut.webp)](https://engineeringhardware.com/product/factory-price-grade-8-8-hex-slotted-nut-m6-m24-black-oxide-castle-nut/)

Slotted & Castle Nuts

### [Factory Price Grade 8.8 Hex Slotted Nut M6-M24 Black Oxide Castle Nut](https://engineeringhardware.com/product/factory-price-grade-8-8-hex-slotted-nut-m6-m24-black-oxide-castle-nut/)

Auto Fasteners · Steel

**US$0.12 – 0.24**MOQ 1,000 pieces

[![High Strength Carbon Steel Slotted Hex Castle Nut Anti-Lock Fastener](https://img.engineeringhardware.com/High-Strength-Carbon-Steel-Slotted-Hex-Castle-Nut-Anti-Lock-Fastener-2.webp)](https://engineeringhardware.com/product/high-strength-carbon-steel-slotted-hex-castle-nut-anti-lock-fastener-2/)

Slotted & Castle Nuts

### [High Strength Carbon Steel Slotted Hex Castle Nut Anti-Lock Fastener](https://engineeringhardware.com/product/high-strength-carbon-steel-slotted-hex-castle-nut-anti-lock-fastener-2/)

Hexagon Head · DIN

**US$0.22 – 0.24**MOQ 5,000 pieces

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Slotted & Castle Nuts

### [Stainless Steel 304 Carbon Steel Zinc Hexagon Thin Slotted Nuts](https://engineeringhardware.com/product/stainless-steel-304-carbon-steel-zinc-hexagon-thin-slotted-nuts/)

ISO ANSI/ASME DIN GB · Stainless Steel

**US$0.36 – 0.72**MOQ 1,000 pieces

[![Professional Manufacturer Customized Stainless Steel Zinc Alloy Hex Nut, Slotted Nut, Nylon Nut, Flange Nut](https://img.engineeringhardware.com/Professional-Manufacturer-Customized-Stainless-Steel-Zinc-Alloy-Hex-Nut-Slotted-Nut-Nylon-Nut-Flange-Nut.webp)](https://engineeringhardware.com/product/professional-manufacturer-customized-stainless-steel-zinc-alloy-hex-nut-slotted-nut/)

Slotted & Castle Nuts

### [Professional Manufacturer Customized Stainless Steel Zinc Alloy Hex Nut, Slotted Nut, Nylon Nut, Flange Nut](https://engineeringhardware.com/product/professional-manufacturer-customized-stainless-steel-zinc-alloy-hex-nut-slotted-nut/)

Hexagon Head · DIN, ANSI, GB, JIS, GOST, BSW

**US$0.006 – 12.00**MOQ 1,000 pieces

[View all Slotted & Castle Nuts →](https://engineeringhardware.com/fastener-products/nuts/slotted-castle-nuts/) [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

What Split Nuts are specified for, industry by industry. Stocked from M8 to M20.

### Industries that specify Split Nuts

- **Steel fabrication:** Bolted structural and frame connections.
- **Automotive & transport:** Vibration-prone joints where the locking type is specified on the drawing.
- **Maintenance & MRO:** Replacements matched to the existing bolt class, thread and finish.
- **Building services:** Threaded rod, channel and suspension assemblies.
- **Machine building & OEM:** The clamping counter-face on studs and bolts throughout an assembly.

![Split Nuts in use — application photograph](https://engineeringhardware.com/wp-content/uploads/2026/09/Split-Nuts-Detail.webp)

### Typical applications

- joints re-torqued at a service interval
- completing a bolted joint on a stud, rod or bolt
- locking an adjustment so it cannot drift

### 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.
- **Match the class:** A nut below the bolt property class strips before the bolt reaches its own limit — pair class 8 nuts with 8.8 bolts, class 10 with 10.9.

[Full application guide: where Split Nuts are used, how to specify them, and the cases they are wrong for](https://engineeringhardware.com/applications/split-nuts/)

## Technical Drawing

Dimensioned line drawing of M8 Split Nuts (Axially Slotted) to Trade series (split hex nut). Side view and top view, drawn to the dimensions in the table below and redrawn for any size selected.

- **Pitch (mm):** 1.25
- **Width across flats s (mm):** 13.0
- **Width across corners e (mm):** 14.38
- **Nut height m (mm):** 6.8
- **Slot width (mm):** 1.5
- **Material:** Free-cutting steel
- **Blank standard:** DIN 934 blank

## Dimensions & Specifications (Trade series (split hex nut))

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

| Thread size | Pitch (mm) | Width across flats s (mm) | Width across corners e (mm) | Nut height m (mm) | Slot width (mm) | Material | Blank standard |
| --- | --- | --- | --- | --- | --- | --- | --- |
| [M8](https://engineeringhardware.com/guide/size/m8-left-hand-thread-hex-nuts/) | 1.25 | 13.0 | 14.38 | 6.8 | 1.5 | Free-cutting steel | DIN 934 blank |
| [M10](https://engineeringhardware.com/guide/size/m10-left-hand-thread-hex-nuts/) | 1.5 | 17.0 | 18.90 | 8.4 | 2.0 | Free-cutting steel | DIN 934 blank |
| [M12](https://engineeringhardware.com/guide/size/m12-left-hand-thread-hex-nuts/) | 1.75 | 19.0 | 21.10 | 10.8 | 2.0 | Free-cutting steel | DIN 934 blank |
| [M16](https://engineeringhardware.com/guide/size/m16-split-nuts/) | 2.0 | 24.0 | 26.75 | 14.8 | 2.5 | Free-cutting steel | DIN 934 blank |
| [M20](https://engineeringhardware.com/guide/size/m20-left-hand-thread-hex-nuts/) | 2.5 | 30.0 | 33.53 | 18.0 | 3.0 | Free-cutting steel | DIN 934 blank |

Split Nuts (Axially Slotted) are nuts manufactured to Trade series (split hex nut). This page lists the full dimensional range with the key specifications engineers need to select and specify them.

## What Are Split Nuts (Axially Slotted)?

Split Nuts (Axially Slotted) are nuts defined by Trade series (split hex nut). 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), alloy steel in property classes 8.8, 10.9 and 12.9, and stainless steel A2 (304) or A4 (316) for corrosion resistance. Specify the material, property class and surface finish appropriate to your load and environment.

## Specification Guides

Each size, material and standard of Split Nuts (Axially Slotted) has its own reference page with the figures for that one configuration.

## Goes With

Hardware commonly specified alongside Split Nuts (Axially Slotted).

## Pricing

Split Nuts (Axially Slotted) 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 split nuts (axially slotted) outside the standard range?

Locking method is specifiable independently of the rest: nylon insert, all-metal deformed thread, serrated flange, or none. Made by cold heading or tapping.

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

[Custom nut manufacturing](https://engineeringhardware.com/custom/nuts/)[Send a drawing](https://engineeringhardware.com/custom/nuts/#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 Split Nuts (Axially Slotted), and how are they driven?

Split Nuts (Axially Slotted) are manufactured to Trade series (split hex nut) and use a hex socket (Allen key). The dimensional values on this page follow that standard.

### Which sizes of Split Nuts (Axially Slotted) does Engineering Hardware supply?

The table on this page lists 5 sizes for Split Nuts (Axially Slotted), ranging from M8 to M20. Sizes outside the table can be quoted on request.

### In which materials are Split Nuts (Axially Slotted) supplied?

Split Nuts (Axially Slotted) are supplied in matching property-class steel and stainless A2 / A4, with finishes including zinc plating, hot-dip galvanizing and black oxide. Choose material and finish to suit the load and the service environment for Split Nuts (Axially Slotted).

### Which Allen key sizes fit Split Nuts (Axially Slotted)?

The hex-socket size for each row of Split Nuts (Axially Slotted) is shown in the spec table — use the matching Allen / hex key (an ISO 2936 hex key set covers the full range).

### 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.