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Nord-Lock 3/4in Locking Washer Carbon Steel 2150
Nord-Lock 3/4 in carbon steel washer pair. Wedge-locking cams hold 3/4 in UNC bolts under vibration.
- Pre-assembled pair for 3/4 in bolts
- Cams lock the joint under vibration
- Through-hardened carbon steel pair for steel-to-steel joints
$1.95
Availability:
Out of stock
Nord-Lock 3/4 in Carbon Steel Locking Washer Pair
The Nord-Lock 3/4 in carbon steel washer pair is a wedge-locking pair that holds bolted joints with tension instead of friction. Cams on the inner faces lock under vibration because the cam angle is steeper than the thread pitch, so a 3/4 in UNC bolt cannot unwind. Serrations embed in the joint as you torque. Use it in tapped holes, through holes, and studs where a standard outer diameter matches the bearing face.
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Key Features
- Wedge-locking washer pair for 3/4 in UNC bolts
- Cams lock the joint under vibration and dynamic load
- Serrations embed into the bolt head or nut and the joint face
- Pre-assembled pair; through holes take a pair on the bolt and a pair on the nut
- Through-hardened carbon steel pair for steel-to-steel joints
- Standard outer diameter for counterbores and typical hole sizes
- Laser-marked for type and batch traceability
Applications
- Tapped holes on 3/4 in UNC bolts
- Through holes (one pair under the head, one pair under the nut)
- Stud bolts in place of threadlocker
- Vibration-prone equipment, rotating machinery, and structural steel
- Counterbore holes with standard outer diameter
Technical Specifications
| Property | Value |
|---|---|
| Type | Wedge-locking washer pair |
| Washer type | NL3/4" |
| Article number | 2150 |
| Bolt size | 3/4 in UNC |
| Sold as | Pair (pre-assembled) |
| Material | Through-hardened EN 1.7182 carbon steel |
| Hardness | 465 HV1 min |
| Temperature range | -50 to 200 C (-58 to 392 F) |
| Coating | Delta Protekt zinc flake (KL100 / VH 302 GZ) |
| Inner diameter | 0.79 in |
| Outer diameter | 1.21 in |
| Pair thickness | 0.13 in |
Frequently Asked Questions
How does this Nord-Lock pair keep a bolt from loosening?
Each pair has cams on one side and serrations on the other. When you tighten, the serrations embed. The cam angle is greater than the thread pitch, so any loosening motion has to climb the cams, which increases clamp load instead of letting the bolt unwind.
Do I use one pair or two?
Tapped holes and studs take one pair under the 3/4 in bolt head or nut. Through holes take two pairs: one under the head and one under the nut. Close the cams on both pairs before you apply torque.
When should I use the oversized (SP) washer instead?
Use SP (enlarged OD) on large or slotted holes or on softer joint faces, and pair it with a flanged nut or bolt. This page is the standard OD pair for typical holes and counterbores.
What mating surface hardness is required?
Mating faces must be softer than the washers. Carbon steel Nord-Lock washers are 465 HV1 min. Do not use them on harder surfaces, or on wood or plastic.
What bolt grades can I use?
Carbon steel Nord-Lock washers are rated up to bolt grade 12.9. Service temperature is -50 to 200 C (-58 to 392 F).
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