Combi Screws with Washer
Combi screws with a captive washer fitted before thread rolling. The washer can't fall off on the line.
Manufactured by Uvi Tech Fit in Kundli, Sonipat, India.
Or message us on WhatsAppScrew-and-washer assemblies (SEMS), ISO 10644, DIN 6900
Overview
Combi screws with a plain, spring or tooth washer fitted before the thread is rolled, so the washer can't fall off. One part instead of two on the assembly line.
Also known as: SEMS screw, screw with captive washer, screw and washer assembly.
Related parts: JCB Head Screws / Bolts, Truss Combi Screws, Male-Female Connectors
Used in
- Sheet metal assemblies
- Panels
- Electrical and hardware products
- Automotive components
Specification
Washer options
| Washer | What it does | Typical use |
|---|---|---|
| Plain | Spreads clamp load over a larger area | Thin sheet, plastic, painted surfaces |
| Split spring | Adds spring tension against loosening | Terminals, light vibration |
| Conical spring | Keeps preload when joint settles | Electrical connections |
| External tooth | Teeth bite the surface for grip and earthing | Earthing points, painted panels |
Give screw size, length, head type, washer type and finish. Washer and screw are assembled before the thread is rolled.
Parts are checked at each stage with vernier calipers, micrometers and visual inspection. Material and test reports can be arranged on request.
Request a Quote
Give size, length, material, finish and quantity. For a custom part, attach a drawing or a photo of the sample.
Questions
Why captive instead of a loose washer?
One part instead of two: faster assembly, no dropped washers inside equipment, and the washer is always there.
Can the washer be a different finish from the screw?
Usually the assembly is plated together after rolling. If you need different finishes, mention it so the sequence can be planned.
Which head types can take a captive washer?
Pan, cheese, hex and combi heads. Countersunk heads cannot, because the washer would stop the head seating.