Date Published:Jul. 08. 2016 Date Updated:Aug. 09. 2023
What are Captive Screws? Introduction of the NBK Captive Series
NBK has standardized products for fall prevention of parts in the knob, pull and e-nedzi.com (special screw) categories.
Use NBK's Captive Series for food machinery, packaging machinery and chemical manufacturing equipment that require CE Marking compatibility and measures against contamination.
CE Marking
CE Marking (CE Mark) is a mark demonstrating that the manufacturer is in compliance with the EC Directive for products such as machinery and equipment.
Products that are exported or distributed to EC member states must comply with the EC Directive. Therefore, in order to circulate the products in EU member states, CE Marking is required to demonstrate that they comply with the EC Directive.
According to the "EU Machinery Directive Annex 1" of "Machinery Directive (2006/42/EC)" in the EC Directive, screws that secure a protective cover or inspection cover of equipment and devices must not fall out of the cover when it is removed.
Excerpt from "EU Machinery Directive Annex 1"
- 1.4.2 Special Requirements for Guards
- Item 1.4.2.1 Fixed Guards
- Fixed guards must be fixed by systems that can be opened or removed only with tools.
- Their fixing systems must remain attached to the guards or to the machinery when the guards are removed.
- Where possible, guards must be incapable of remaining in place without their fixings.
- 1.1.1 Definitions
- (f) ‘guard’ means a part of the machinery used specifically to provide protection by means of a physical barrier.
Types and Features of Captive Series
Captive Series List
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| Part Number | KDMS-SC | KNM-SC | KUM-SC | UNMS-SC | LYSC-N |
| Product Name |
Captive Dimple Knobs |
Captive Knurled Knobs |
Captive Knurled Knobs |
Captive Pulls |
Captive Washer for Pull |
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| Part Number | LYSC-N-SSC | SSC | SSC(INCH) | SSCZS | SSCLS |
| Part Number |
Captive Washer for Pull (with Captive Screw) |
Hex Socket Head Cap Captive Screws |
Hex Socket Head Cap Captive Screws (Inch Screws) |
Pan Head Machine Screws for Precision Instruments (Miniature Screws) |
Hex Socket Head Cap Captive Screws with Low Profile |
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| Part Number | SSCHS | SSC-SNHS | SSC-SRBS | SSCPS | SSCMS |
| Product Name | Hex Socket Head Cap Captive Screws with Special Low Profile |
Hex Head Captive Screws |
Captive Button Head Cap Bolts with Hexalobular Socket (with Pin) |
Cross Recessed Pan Head Captive Machine Screws |
Cross Recessed Truss Head Captive Screws |
Captive Screw
Captive Screw
Even when the screw is removed from the frame, the captive screw does not fall out of the cover because it catches on the cover screw hole.Extensive line up of hex socket head cap screws, hex bolts, pan head machine screws, etc.
Captive Knobs
Even when the screw is removed from the frame, the captive knob does not fall out of the cover because it catches on the cover screw hole.
Captive Pulls
Captive Pulls
Even if the nut is loosened, as it temporarily remains in the relief cut part, the pull and nut prevent an accidental fall.For Captive Pull UNMS-SC
For Pull without Captive Mechanism
Captive Washer for Pull
With a pull mounted, the pull mounting surface is beautifully decorated while pull mounting screw fallout is prevented.
Captive Processing Service
e-nedzi.com products (special screws) are provided with relief cut and fallout prevention functions.See here for details on the captive processing service ＞＞
With relief cutting, even when the screw is removed from the frame, it does not fall out of the cover because it catches on the cover screw hole.
