Looking for a replacement or cross reference for SAPER LOCK nuts? Auto-Lok can offer spring-equipped locking nuts as practical alternatives for many metric sizes.
SAPER LOCK nuts are self-locking nuts that use an internal spring locking system to help prevent loosening. When a SAPER LOCK nut is no longer available or when an alternative source is needed, Auto-Lok spring-equipped nuts can be used as a cross reference in many applications.
The table below shows common SAPER LOCK nut references and the corresponding Auto-Lok spring-equipped nut part numbers, including metric size, thread pitch, and key dimensions.
SAPER LOCK Nut Cross Reference Table
Use this table to find the Auto-Lok spring-equipped nut that corresponds with your SAPER LOCK nut reference.
| SAPER LOCK Nut | Auto-Lok Spring-Equipped Nut | Metric Size | Pitch | B | L | H |
|---|---|---|---|---|---|---|
| SP05 | ALNSEM5x080CL8 | M5 | 0,8 | - | - | - |
| SP06 | ALNSEM6x100CL8 | M6 | 1 | 10 | 9,5 | 5 |
| SP08 | ALNSEM8x125CL8 | M8 | 1,25 | 13 | 12,4 | 6,5 |
| SP10 | ALNSEM10x080CL8 | M10 | 1,5 | 17 | 15,5 | 8 |
| SP12 | ALNSEM12X175CL8 | M12 | 1,75 | 19 | 19,5 | 10 |
| SP14 | ALNSEM14x200CL8 | M14 | 2 | 22 | 20,6 | 11 |
| SP16 | ALNSEM16x200CL8 | M16 | 2 | 24 | 22,6 | 13 |
| SP18 | ALNSEM18X250CL8 | M18 | 2,5 | 27 | 26,8 | 15 |
| SP20 | ALNSEM20X250CL8 | M20 | 2,5 | 30 | 28,8 | 16 |
| SP22 | ALNSEM22X250CL8 | M22 | 2,5 | 32 | 30,8 | 18,9 |
| SP24 | ALNSEM24x300CL8 | M24 | 3 | 36 | 34,8 | 19 |
| SP27 | ALNSEM27x300CL8 | M27 | 3 | 41 | 37,5 | 22 |
| SP30 | ALNSEM30x350CL8 | M30 | 3,5 | 46 | 41,5 | 24 |
| SP33 | ALNSEM33x350CL8 | M33 | 3,5 | 50 | 44,5 | 26 |
| SP36 | ALNSEM36x400CL8 | M36 | 4 | 55 | 49,5 | 29 |
| SP39 | ALNSEM39x400CL8 | M39 | 4 | 60 | 52,5 | 31 |
| SP42 | ALNSEM42x450CL8 | M42 | 4,5 | 65 | 55 | 32 |
| SP45 | ALNSEM45x450CL8 | M45 | 4,5 | 70 | 59 | 36 |
| SP48 | ALNSEM48x500CL8 | M48 | 5 | 75 | 63,5 | 38 |
| SP52 | ALNSEM52x500CL8 | M52 | 5 | 80 | - | - |
| SP56 | ALNSEM56x550CL8 | M56 | 5,5 | 85 | 72,1 | 44 |
| SP60 | ALNSEM60X550CL8 | M60 | 5,5 | 90 | 76,2 | 48 |
| SP64 | ALNSEM64X600CL8 | M64 | 6 | 95 | 81,7 | 51 |
| SP72 | ALNSEM72X600CL8 | M72 | 6 | 105 | 87,8 | 57 |
| SP80 | ALNSEM80X600CL8 | M80 | 6 | 115 | 94,7 | 64 |
Dimensions are shown in millimetres where applicable. Please verify dimensions and suitability before using any cross reference in critical assemblies.
Why Choose Auto-Lok Spring-Equipped Nuts?
Auto-Lok spring-equipped nuts are designed for secure fastening where resistance to vibration and loosening is important. Their spring locking system helps keep the nut engaged on the thread, making them a useful alternative when replacing SAPER LOCK style locking nuts.
- Available in a wide range of metric sizes
- Spring-equipped locking design
- Useful for applications exposed to vibration or movement
- Practical cross reference for many SAPER LOCK nut references
- Clear part numbering by metric size and pitch
Need Help Finding the Right Cross Reference?
Not sure which Auto-Lok nut matches your SAPER LOCK reference? Send us your part number, thread size, pitch, and application details. We can help you identify the most suitable spring-equipped locking nut.