Schnorr Load Washers
Taking the form of a disc spring, a Schnorr load washer serves as a fastening solution intended to compensate for the loosening of screwed connections.
Designed to protect for bolt joints.
Schnorr load washers are conical shaped washers engineered for the protection of bolted joints by maintaining the load under the head of a bolted joint. Load washers have been specially developed for high-strength bolts of grades 8.8 – 10.9.  The load of the washers have been matched to these bolts and are 70% to 90% of the standard bolt load in the flat state.
- Optimum compensation for setting in the joint
- Suitable for high axial load
- Reduction of the dynamic loading of the screw
- Uniform concentric loading and high safety through a high degree of spring action
Markets
IEC have a range of mechanical solutions to suit a broad spectrum of markets and applications, from aerospace to skateboards.
Markets
IEC have a range of mechanical solutions to suit a broad spectrum of markets and applications, from aerospace to skateboards.
Markets
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Schnorr Safety Washers
Schnorr Load Washers Catalogue
Schnorr Precision Engineered Load Washers
The term ‘load washer’ is used to describe a spring element in the form of a disc spring that achieves its locking effect solely by means of the frictional connection.
These precision engineered washers are intended to compensate for loosening of the screwed connection, for example, due to setting, by maintaining a sufficiently high pretension in the connection with spring force. They are especially suitable for primarily axially loaded, short bolts. However, they provide no effective security against unscrewing due to alternating lateral loading.
Schnorr precision engineered washers offer the following advantages:
- High axial load:Â Ensures robust performance under high-stress conditions.
- Optimum compensation for setting in the joint:Â Maintains joint integrity over time.
- Reduction of dynamic loading of the bolt due to higher elasticity of the joint:Â Enhances durability and longevity.
- Uniform concentric loading eliminates bending in the bolt:Â Promotes structural stability.
- Greater safety with a high degree of spring action:Â Provides reliable performance in critical applications.
- Suitable for captive fitting on a wide range of bolts (combi bolts):Â Versatile application in various settings.
Schnorr Heavy Duty Precision Engineered Load Washers (HDS)
High Stress Precision Engineered Load Washers (HS)
These precision engineered washers have a smaller outer diameter than heavy-duty load washers (DIN 6796). A notable feature of these washers is the slightly curved form, which provides a progressively increasing characteristic curve. Despite the smaller outside diameter dimensions, this makes it possible to achieve the same load as the heavy-duty load washers. These washers are primarily used when the space available is insufficient for standard load washers. They are available for bolt sizes M6 to M30.
Schnorr holds ISO9001 and TS16949 approvals, ensuring that all washers meet the highest standards of quality and reliability. Our washers are designed to provide superior performance and durability in a wide range of applications, from automotive to aerospace industries.
Choose Schnorr precision engineered washers for your high-performance needs. Whether you require heavy-duty or high-stress load washers, our products offer the reliability and efficiency that your projects demand.
HIGH STRESS LOAD WASHERS 'HS'
This safety washer is in principle a HDS washer with a smaller outer diameter than those in DIN 6796. A notable feature of these load washers is the slightly curved form which provides a progressively increasing characteristic curve. Despite the smaller outside diameter dimensions this make is possible to achieve the same load as the HDS washers as per DIN 6796. These washers are primarily used when the space available is insufficient for standardised load washers.
| Technical requirements: | According to DIN 267, Part 26 |
| Material grades: | Spring steel according to DIN EN 10132-4, other materials on request |
| Available surfaces: | Phosphated and oiled; mechanically galvanized; other materials on request. |
| Article No: | Applies to the normal version made of spring steel |
| h max: | Maximum dimension in delivery condition |
| h min: | Minimum dimension after setting test according to DIN 267, Part 26 |
| Contact force: | contact forces for the setting test according to DIN 267, Part 26 |
| Minimum residual spring load: | Spring load, which rests after load with the contact pressure according to DIN 267, Part 2 and subsequent relieving of 100mm |
| Article No./ Order Ref. | Finish | Nominal Size | Ordering Dimensions | Contact Force | Minimum residual spring load | ||||
| mm | d1 mm | d2 mm | s mm | hmax mm | hmin mm | F N | F N | ||
| 416320 431510 | Phosphated & oiled Zn12M+passivation | 6 | 6.4 | 12 | 1.5 | 1.64 | 1.90 | 10200 | 4200 |
| 416520 431520 | Phosphated & oiled Zn12M+passivation | 8 | 8.4 | 17 | 2.0 | 2.10 | 2.55 | 18600 | 7700 |
| 423220 431530 | Phosphated & oiled Zn12M+passivation | 10 | 10.5 | 21 | 2.5 | 2.75 | 3.15 | 29600 | 12400 |
| 426400 431540 | Phosphated & oiled Zn12M+passivation | 12 | 13.0 | 24 | 3.0 | 3.27 | 3.75 | 43000 | 18000 |
| 429320 431550 | Phosphated & oiled Zn12M+passivation | 14 | 15.0 | 28 | 3.5 | 3.80 | 4.35 | 59100 | 25000 |
| 430900 431560 | Phosphated & oiled Zn12M+passivation | 16 | 17.0 | 30 | 4.0 | 4.31 | 4.95 | 80900 | 34000 |
| 433750 431570 | Phosphated & oiled Zn12M+passivation | 18 | 19.0 | 33 | 4.5 | 4.80 | 5.50 | 102000 | 57000 |
| 435320 431580 | Phosphated & oiled Zn12M+passivation | 20 | 21.0 | 36 | 5.0 | 5.30 | 5.95 | 130000 | 73000 |
| 436620 431590 | Phosphated & oiled Zn12M+passivation | 22 | 23.0 | 40 | 5.5 | 5.90 | 6.70 | 162000 | 91000 |
| 439150 431600 | Phosphated & oiled Zn12M+passivation | 24 | 25.0 | 45 | 6.0 | 6.45 | 7.30 | 188000 | 122000 |
| 440100 431610 | Phosphated & oiled Zn12M+passivation | 27 | 28.0 | 50 | 6.5 | 7.00 | 8.00 | 246000 | 161000 |
| 442650 431620 | Phosphated & oiled Zn12M+passivation | 30 | 31.0 | 58 | 7.0 | 7.65 | 8.90 | 300000 | 196000 |
HEAVY DUTY LOAD WASHERS 'HDS'
| Technical requirements: | According to DIN 267, Part 26 |
| Material grades: | Spring steel according to DIN EN 10132-4, other materials on request |
| Available surfaces: | Hardened, blank and oiled; mechanically galvanized; other materials on request. |
| Article No: | Applies to the normal version made of spring steel |
| h max: | Maximum dimension in delivery condition |
| h min: | Minimum dimension after setting test according to DIN 267, Part 26 |
| Contact force: | contact forces for the setting test according to DIN 267, Part 26 |
| Minimum residual spring load: | Spring load, which rests after load with the contact pressure according to DIN 267, Part 2 and subsequent relieving of 100mm |
| Article No./ Order Ref. | Finish | Nominal Size | Ordering Dimensions | Contact Force | Minimum residual spring load | ||||
| mm | d1 mm | d2 mm | s mm | hmax mm | hmin mm | F N | F N | ||
| 700000 702110 | Blank, oiled Zn12M+passivation | 2 | 2.2 | 5 | 0.4 | 0.5 | 0.60 | * | * |
| 700100 702120 | Blank, oiled Zn12M+passivation | 2.5 | 2.7 | 6 | 0.5 | 0.6 | 0.72 | * | * |
| 700200 702130 | Blank, oiled Zn12M+passivation | 3 | 3.2 | 7 | 0.6 | 0.7 | 0.85 | * | * |
| 700300 702140 | Blank, oiled Zn12M+passivation | 3.5 | 3.7 | 8 | 0.8 | 0.9 | 1.06 | * | * |
| 700400 702150 | Blank, oiled Zn12M+passivation | 4 | 4.3 | 9 | 1.0 | 1.1 | 1.30 | 4400 | 1400 |
| 700500 702160 | Blank, oiled Zn12M+passivation | 5 | 5.3 | 11 | 1.2 | 1.3 | 1.55 | 7200 | 2300 |
| 700600 702170 | Blank, oiled Zn12M+passivation | 6 | 6.4 | 14 | 1.5 | 1.7 | 2.00 | 10200 | 4200 |
| 700700 702180 | Blank, oiled Zn12M+passivation | 7 | 7.4 | 17 | 1.75 | 2.0 | 2.30 | 14800 | 6200 |
| 700800 702190 | Blank, oiled Zn12M+passivation | 8 | 8.4 | 18 | 2.0 | 2.2 | 2.60 | 18600 | 7700 |
| 700900 702200 | Blank, oiled Zn12M+passivation | 10 | 10.5 | 23 | 2.5 | 2.8 | 3.20 | 29600 | 12400 |
| 701000 702210 | Blank, oiled Zn12M+passivation | 12 | 13.0 | 29 | 3.0 | 3.4 | 3.95 | 43000 | 18000 |
| 701100 702220 | Blank, oiled Zn12M+passivation | 14 | 15.0 | 35 | 3.5 | 4.0 | 4.65 | 59100 | 25000 |
| 701200 702230 | Blank, oiled Zn12M+passivation | 16 | 17.0 | 39 | 4.0 | 4.6 | 5.25 | 80900 | 34000 |
| 701300 702240 | Blank, oiled Zn12M+passivation | 18 | 19.0 | 42 | 4.5 | 5.1 | 5.80 | 102000 | 57000 |
| 701400 702250 | Blank, oiled Zn12M+passivation | 20 | 21.0 | 45 | 5.0 | 5.6 | 6.40 | 130000 | 73000 |
| 701500 702260 | Blank, oiled Zn12M+passivation | 22 | 23.0 | 49 | 5.5 | 6.1 | 7.05 | 162000 | 91000 |
| 701600 702270 | Blank, oiled Zn12M+passivation | 24 | 25.0 | 56 | 6.0 | 6.8 | 7.75 | 188000 | 122000 |
| 701700 702280 | Blank, oiled Zn12M+passivation | 27 | 28.0 | 60 | 6.5 | 7.3 | 8.35 | 246000 | 161000 |
| 701800 702290 | Blank, oiled Zn12M+passivation | 30 | 31.0 | 70 | 7.0 | 8.0 | 9.20 | 300000 | 196000 |
