---
title: "M1.0 Micro Spring Lock Washers Dimensions"
description: "M1.0 Micro Spring Lock Washers: outside diameter 1 mm, coarse thread pitch 0.25 mm."
url: https://engineeringhardware.com/guide/size/m1-0-micro-spring-lock-washers/
source: Engineering Hardware & Fasteners
---

# M1.0 Micro Spring Lock Washers Dimensions

Washers · Trade series (miniature spring washers)

Controlling dimensions to Trade series (miniature spring washers), with tolerances and fit.

M1.0 Micro Spring Lock Washers dimensions to Trade series (miniature spring washers): outside diameter 1 mm, coarse thread pitch 0.25 mm.

- **Outside diameter:** 1 mm
- **Coarse thread pitch:** 0.25 mm

Figures are nominal values from the governing standard. Confirm against the tolerance class for your application before machining or ordering.

![M1.0 Micro Spring Lock Washers Dimensions reference image](https://engineeringhardware.com/wp-content/uploads/2026/09/Micro-Spring-Lock-Washers.webp)

Dimensional data for M1.0 Micro Spring Lock Washers to Trade series (miniature spring washers), with the installation notes for this type.

Values are taken from the governing standard rather than from a general machine-thread table, because this type is not selected on one.

## M1.0 Dimensional Row (Trade series (miniature spring washers))

| For thread size | Washer form | Material options | Application note |
| --- | --- | --- | --- |
| M1.0 | compact spring lock washer | steel / stainless steel | precision instruments and electronic devices |

## Mating Parts for M1.0

A M1.0 flat washer pairs with a M1.0 bolt/screw and matching M1.0 nut.

Custom manufacturing · Made to drawing

## Need micro spring lock washers in a size this table does not list?

This page covers M1.0 micro spring lock washers. Bore, outside diameter, thickness, temper and finish are the variables here — there is no thread to specify, so the fit and the bearing area are what the drawing has to pin down. Made by stamping or punching.

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

[Custom washer manufacturing](https://engineeringhardware.com/custom/washers/)[Send a drawing](https://engineeringhardware.com/custom/washers/#rfq)

## Technical Drawing

Dimensioned line drawing of M1.0 Micro Spring Lock Washers to Trade series (miniature spring washers). Side view and top view, drawn to the dimensions in the table below and redrawn for any size selected.

- **Washer form:** compact spring lock washer
- **Material options:** steel / stainless steel
- **Application note:** precision instruments and electronic devices

## Dimensions & Specifications (Trade series (miniature spring washers))

| For thread size | Washer form | Material options | Application note |
| --- | --- | --- | --- |
| M1.0 | compact spring lock washer | steel / stainless steel | precision instruments and electronic devices |
| M1.2 | compact spring lock washer | steel / stainless steel | precision instruments and electronic devices |
| M1.4 | compact spring lock washer | steel / stainless steel | precision instruments and electronic devices |
| M1.7 | compact spring lock washer | steel / stainless steel | precision instruments and electronic devices |

Product catalog

## Related Micro Spring Lock Washers products

[![Industrial High Tensile General DIN 127 ASME B18.21.2m φ2-φ100 Anti-Loosening Spring Lock Washer 430-530hv Black Oxide for Bolts and Nuts Assembled](https://img.engineeringhardware.com/Industrial-High-Tensile-General-DIN-127-ASME-B18-21-2m-2-100-Anti-Loosening-Spring-Lock-Washer-430-530hv-Black-Oxide-for-Bolts-and-Nuts-Assembled.webp)](https://engineeringhardware.com/product/industrial-high-tensile-general-din-127-asme-b18-21-2m-2-100-anti-loosening-spring/)

Spring & Split Lock Washers

### [Industrial High Tensile General DIN 127 ASME B18.21.2m φ2-φ100 Anti-Loosening Spring Lock Washer 430-530hv Black Oxide for Bolts and Nuts Assembled](https://engineeringhardware.com/product/industrial-high-tensile-general-din-127-asme-b18-21-2m-2-100-anti-loosening-spring/)

Spring Washer · Carbon Steel

**US$0.012 – 0.036**MOQ 1,000 pieces

[![GB955 Stainless Steel Wave Spring Washer GB955 200hv SUS304 Small Waveform Flat Washer Wave Spring Washers](https://img.engineeringhardware.com/GB955-Stainless-Steel-Wave-Spring-Washer-GB955-200hv-SUS304-Small-Waveform-Flat-Washer-Wave-Spring-Washers.webp)](https://engineeringhardware.com/product/gb955-stainless-steel-wave-spring-washer-gb955-200hv-sus304-small-waveform-flat/)

Spring & Split Lock Washers

### [GB955 Stainless Steel Wave Spring Washer GB955 200hv SUS304 Small Waveform Flat Washer Wave Spring Washers](https://engineeringhardware.com/product/gb955-stainless-steel-wave-spring-washer-gb955-200hv-sus304-small-waveform-flat/)

Wave Spring Washer · DIN, ASME, BS, JIS, as, En, GB

**US$0.0006 – 0.0024**MOQ 1 piece

[![DIN127 Ss Stainless Steel #6 #8 1/4-20 Split Spring Washers Industrial Nickel Plated Washer High Quality GB93 Lock Washer](https://img.engineeringhardware.com/DIN127-Ss-Stainless-Steel-6-8-1-4-20-Split-Spring-Washers-Industrial-Nickel-Plated-Washer-High-Quality-GB93-Lock-Washer.webp)](https://engineeringhardware.com/product/din127-ss-stainless-steel-6-8-1-4-20-split-spring-washers-industrial-nickel-plated/)

Spring & Split Lock Washers

### [DIN127 Ss Stainless Steel #6 #8 1/4-20 Split Spring Washers Industrial Nickel Plated Washer High Quality GB93 Lock Washer](https://engineeringhardware.com/product/din127-ss-stainless-steel-6-8-1-4-20-split-spring-washers-industrial-nickel-plated/)

Spring Washer · Stainless Steel, Sarbon Steel, Brass

**US$0.012 – 0.096**MOQ 1,000 pieces

[![Handan Yanzhao Factory Direct Sales High Quality DIN127 Spring Washer](https://img.engineeringhardware.com/Handan-Yanzhao-Factory-Direct-Sales-High-Quality-DIN127-Spring-Washer.webp)](https://engineeringhardware.com/product/handan-yanzhao-factory-direct-sales-high-quality-din127-spring-washer/)

Spring & Split Lock Washers

### [Handan Yanzhao Factory Direct Sales High Quality DIN127 Spring Washer](https://engineeringhardware.com/product/handan-yanzhao-factory-direct-sales-high-quality-din127-spring-washer/)

Spring Washer · DIN/ISO/ANSI/GB/BS/AS/JIS

**US$852.00**MOQ 1 ton

[![Premium Brass Flat Plain Washer M6 Smooth Finish DIN125 for Decorative Fittings Flat Washer](https://img.engineeringhardware.com/Premium-Brass-Flat-Plain-Washer-M6-Smooth-Finish-DIN125-for-Decorative-Fittings-Flat-Washer.webp)](https://engineeringhardware.com/product/premium-brass-flat-plain-washer-m6-smooth-finish-din125-for-decorative-fittings-flat/)

Spring & Split Lock Washers

### [Premium Brass Flat Plain Washer M6 Smooth Finish DIN125 for Decorative Fittings Flat Washer](https://engineeringhardware.com/product/premium-brass-flat-plain-washer-m6-smooth-finish-din125-for-decorative-fittings-flat/)

Spring Washer · Stainless Steel

**US$0.12**MOQ 1,000 pieces

[![M4.2-M6.3 Galvanized Carbon Steel Stainless Steel EPDM Bonded Washers Sealing Gasket](https://img.engineeringhardware.com/M4-2-M6-3-Galvanized-Carbon-Steel-Stainless-Steel-EPDM-Bonded-Washers-Sealing-Gasket.webp)](https://engineeringhardware.com/product/m4-2-m6-3-galvanized-carbon-steel-stainless-steel-epdm-bonded-washers-sealing-gasket/)

Spring & Split Lock Washers

### [M4.2-M6.3 Galvanized Carbon Steel Stainless Steel EPDM Bonded Washers Sealing Gasket](https://engineeringhardware.com/product/m4-2-m6-3-galvanized-carbon-steel-stainless-steel-epdm-bonded-washers-sealing-gasket/)

Flat Washer/Spring Washer/Lock Washer/Lock Washer · Steel/Ss/Brass/Fib…

**US$0.012 – 0.12**MOQ 10,000 pieces

[View all Spring & Split Lock Washers →](https://engineeringhardware.com/fastener-products/washers/spring-split-lock-washers/) [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 for M1.0 Micro Spring Lock Washers

The sectors that buy Micro Spring Lock Washers, and the duty each one buys them for. Stocked from M1.0 to M1.7.

### Industries that specify Micro Spring Lock Washers

- **Electronic devices:** Compact spring forms fit around fine screws without a full-size washer footprint.
- **Sensor assemblies:** Steel or stainless options match the enclosure and environment.
- **Micro repair:** Thread-matched inside diameter supports a controlled small-part replacement.
- **Precision instruments:** Miniature spring washers help maintain contact in small threaded assemblies.
- **Machine building & OEM:** Setting bearing area on soft alloy, plastic and oversized holes.
- **Timber & construction:** Large-diameter washers that stop pull-through in softer material.

### Typical applications

- matching the inside diameter to M1.0 through M1.7 hardware
- choosing steel or stainless for the device environment
- checking the joint rather than assuming a spring washer supplies structural locking
- adding a compact spring element under a miniature screw or nut
- protecting a painted or plated surface under a turned nut
- maintaining bolt tension in a joint that settles

### 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.
- **Vibration:** Specified where cyclic load would loosen a plain nut or screw — rotating plant, rail, mobile equipment and anything that is not re-torqued in service.
- **Hardness matters:** Under a high-strength bolt a soft washer embeds into the joint and preload is lost — specify a hardened washer for structural bolting.

### Where to use something else

- Do not treat the miniature washer as a substitute for a positive locking feature in a safety-critical joint.

[Full application guide: where Micro Spring Lock Washers are used, how to specify them, and the cases they are wrong for](https://engineeringhardware.com/applications/micro-spring-lock-washers/)

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's the typical proof load behavior of M1.0 class 8.8?

Micro-thread joints are sensitive to plastic deformation in the first turn under load — use a torque-limiting driver and check the bearing surface deformation on softer mating materials.

### Which washer dimensions matter most for M1.0?

For a flat washer, the outside diameter (the bearing surface) and the thickness control how the load is spread under the head and how much elastic preload is preserved. The inside diameter must clear the bolt body but not be so large that the head bears mostly on the washer's outer rim.

### What is the coarse-thread pitch of M1.0 for Micro Spring Lock Washers?

For M1.0 the standard coarse pitch is 0.25 mm — this is the value used for Micro Spring Lock Washers.

### What clearance and tapping drill suit M1.0?

Use a 1.2 mm clearance hole (ISO 273 medium) for through-fixing, or a 0.75 mm tapping drill for a coarse M1.0 thread.

### 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.

## Related Pages

[View the full Micro Spring Lock Washers page](https://engineeringhardware.com/fastener/micro-spring-lock-washers/)