Captive Bolts (Screws) / Full Thread Screws
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What are Captive Screws?
These screws are designed to prevent falling out.
They reduce the risk of parts falling off and getting lost.
Ideal for bolts used to secure inspection covers that require frequent attachment and removal.
Benefits of Captive Bolts and Key Selection Points
Why are captive bolts used for protective and inspection covers that are frequently installed and removed? Here are the key benefits and selection points.
1. Benefits
Screws dropped during equipment maintenance can cause downtime while they are being located and retrieved.
Captive bolts remain secured in the cover even when removed from the frame, preventing them from falling out and reducing downtime.
Captive bolts eliminate tasks such as storing removed screws in trays and counting them during installation.
They also help prevent errors such as installing screws of the wrong size.
In food and pharmaceutical plants and cleanrooms, even a single screw dropped inside equipment or onto a production line can cause a serious contamination incident.
Captive bolts remain attached to panels and covers, reducing the risk of screws falling onto production lines or being lost.
They also help reduce the risk of short circuits caused by screws falling onto electrically energized areas.
CE marking indicates that a manufacturer declares that a product complies with applicable EU requirements.
Applicable products placed on the EU market must meet CE marking requirements.
Using CE marking-compliant products in machines and equipment makes it easier to meet CE marking requirements.
2. Applications by Industry
Food and Pharmaceutical Production Lines
Preventing contamination is a top priority during cleaning and routine inspections in food and pharmaceutical production lines.
Using captive bolts for inspection covers helps prevent product recalls and full production line shutdowns caused by dropped screws.
Semiconductor Manufacturing Equipment and Precision Equipment
In high-value, high-precision semiconductor manufacturing equipment, even a single dropped screw can cause equipment failure or downtime lasting several days.
Because semiconductor manufacturing equipment contains many small, compact units, the screws used are also small and can be difficult to find and retrieve if dropped.
Using captive bolts for maintenance covers helps prevent costly repairs and prolonged downtime.
NBK also offers small sizes that are difficult to machine.
Infrastructure and Equipment in Elevated or Confined Spaces
Ideal for communication antennas, ceiling-mounted lighting fixtures, electrical distribution panels, and other locations where footing is unstable or it is difficult to use both hands.
Captive bolts prevent them from being dropped or lost, enabling safer and smoother work.
3. How to Choose the Right Solution to Prevent Screws from Falling Out
| Specific Problems and Requirements | Solutions | Recommended Products |
|---|---|---|
| Screws falling out | Use captive screws with captive washers for double protection against screws falling out. | SSC-SET |
| Screw breakage | Use screws made of high-strength materials, such as high-strength stainless steel or steel. |
SSC-SNSLG SSC-SNS-EL |
| Screw galling (seizure) | Use fluorine-coated screws with excellent lubricity. | SSC-FC |
| Avoiding panel modification | Simply attach them to commercially available screws to help prevent screws from falling out or being lost. | SWAS-SC |
| Securely retaining screws to prevent them from falling out | Add tapped holes to covers to prevent screws from falling out. |
SSC SSCML |
| Screws entering at an angle in recessed areas | Use Self-Aligning Socket Head Cap Captive Screws with Guide Tip for easier straight insertion. | SSC-IG |
4. Available Sizes
Select Inch Thread Size
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| Part Name | Socket Head Cap Captive Screws - Electroless Nickel Plating | Socket Head Cap Captive Screws | Socket Head Cap Captive Screws and Retaining Washer Set | Flanged Socket Head Cap Captive Screws | Socket Head Cap Captive Screws with Low Profile | Socket Head Cap Captive Screws with Special Low Profile | Socket Head Cap Captive Screws with Small Head | Socket Head Cap Captive Screws with Ultra Low Small Head | Socket Head Cap Captive Screws - Cleanroom Washed & Packaged |
| Part Number | SSC-SNS-EL | SSC | SSC-SET | SSC-SFSS | SSCLS | SSCHS | SSC-SD | SSCHS-SD | SSC-UCL |
| Feature | High Strength Captive / Loss Prevention |
Standard Captive / Loss Prevention |
Standard Captive / Loss Prevention |
Flanged Captive/Loss Prevention |
Low Profile Captive / Loss Prevention |
Special Low Profile Captive / Loss Prevention |
Small Head Space-saving Captive / Loss Prevention |
Ultra Low Small Head Space-saving Captive / Loss Prevention |
Captive/ Loss Prevention Cleanroom Washed & Packaged |
| Price | From 4.29 USD | From 2.59 USD | From 25.98 USD | From 2.92 USD | From 3.90 USD | From 5.19 USD | From 4.64 USD | From 6.53 USD | From 3.10 USD |
| Material | Steel | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) |
| Surface Treatment | Electroless nickel plating | - | - | - | - | - | - | - | - |
| Thread Size | M3 ～ M8 | M3 ～ M8 | M3 ～ M8 | M4 ～ M8 | M3 ～ M8 | M3 ～ M8 | M3 ～ M8 | M3 ～ M8 | M3 ～ M8 |
| Operating Temperature (℃) | - | - | - | - | - | - | - | - | - |
| CAD | CAD | CAD | CAD | CAD | CAD | CAD | CAD | CAD | CAD |
| Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications |
| List | SSC-SNS-M3-EL SSC-SNS-M4-EL SSC-SNS-M5-EL SSC-SNS-M6-EL SSC-SNS-M8-EL | SSC-M3 SSC-M4 SSC-M5 SSC-M6 SSC-M8 | SSC-M3-SET SSC-M4-SET SSC-M5-SET SSC-M6-SET SSC-M8-SET | SSC-SFSS-M4 SSC-SFSS-M5 SSC-SFSS-M6 SSC-SFSS-M8 | SSCLS-M3 SSCLS-M4 SSCLS-M5 SSCLS-M6 SSCLS-M8 | SSCHS-M3 SSCHS-M4 SSCHS-M5 SSCHS-M6 SSCHS-M8 | SSC-M3-SD SSC-M4-SD SSC-M5-SD SSC-M6-SD SSC-M8-SD | SSCHS-M3-SD SSCHS-M4-SD SSCHS-M5-SD SSCHS-M6-SD SSCHS-M8-SD | SSC-M3-UCL SSC-M4-UCL SSC-M5-UCL SSC-M6-UCL SSC-M8-UCL |
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| Part Name | Socket Head Cap Captive Screws - Fluorine Coating | Socket Head Cap Captive Screws - PTFE Coating | Socket Head Cap Captive Screws - Low Temperature Black Chrome Treatment | Vented Socket Head Cap Captive Screws | Self-Aligning Socket Head Cap Captive Screws with Guide Tip | Socket Head Cap Captive Screws (Inch Screws) | Socket Head Cap Captive Screws - SUS316L | Socket Head Cap Captive Screws - High Strength Stainless Steel | Socket Head Cap Captive Screws with Low Profile - 316L Stainless Steel |
| Part Number | SSC-FC | SSC-TF | SSC-RY | SSC-SVSS | SSC-IG | SSC(INCH) | SSC-SNSL | SSC-SNSLG | SSC-SLHL |
| Feature | Seizing Prevention Captive / Loss Prevention |
Chemical Resistance Seizing Prevention Captive / Loss Prevention |
Chemical Resistance Anti-reflection Seizing Prevention Captive / Loss Prevention |
Captive / Loss Prevention |
With Guide Seizing Prevention Captive/Loss Prevention |
Inch Thread Captive / Loss Prevention |
Non-magnetic Chemical Resistance Heat Resistance Captive / Loss Prevention |
High Strength (Strength Class 10.8 Equivalent) Heat Resistance Corrosion Resistance Non-magnetic Captive / Loss Prevention |
Captive / Loss Prevention Space-Saving Low Profile |
| Price | From 4.29 USD | From 13.04 USD | From 13.73 USD | From 4.98 USD | From 3.78 USD | From 3.90 USD | From 4.13 USD | From 4.81 USD | From 5.34 USD |
| Material | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) | SUS316L | SUS316L | SUS316L |
| Surface Treatment | Fluorine coating | PTFE coating | Low temperature black chrome treatment | - | - | - | - | - | - |
| Thread Size | M3 ～ M8 | M3 ～ M8 | M3 ～ M8 | M3 ～ M8 | M3 ～ M8 | No.4-40UNC ～ 1/4-20UNC | M3 ～ M8 | M3 ～ M6 | M3 ～ M6 |
| Operating Temperature (℃) | - | - | - | - | - | - | - | - | - |
| CAD | CAD | CAD | CAD | CAD | CAD | CAD | CAD | CAD | CAD |
| Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications |
| List | SSC-M3-FC SSC-M4-FC SSC-M5-FC SSC-M6-FC SSC-M8-FC | SSC-M3-TF SSC-M4-TF SSC-M5-TF SSC-M6-TF SSC-M8-TF | SSC-M3-RY SSC-M4-RY SSC-M5-RY SSC-M6-RY SSC-M8-RY | SSC-SVSS-M3 SSC-SVSS-M4 SSC-SVSS-M5 SSC-SVSS-M6 SSC-SVSS-M8 | SSC-M3-IG SSC-M4-IG SSC-M5-IG SSC-M6-IG SSC-M8-IG | SSC-#10-32 SSC-#4-40 SSC-#6-32 SSC-#8-32 SSC-1/4-20 | SSC-SNSL-M3 SSC-SNSL-M4 SSC-SNSL-M5 SSC-SNSL-M6 SSC-SNSL-M8 | SSC-SNSLG-M3 SSC-SNSLG-M4 SSC-SNSLG-M5 SSC-SNSLG-M6 | SSC-SLHL-M3 SSC-SLHL-M4 SSC-SLHL-M5 SSC-SLHL-M6 |
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| Part Name | Socket Head Cap Captive Screws - Titanium | Socket Head Cap Captive Screws - High Strength Titanium | Hex Head Captive Screws | Hex Head Captive Screws - 316L Stainless Steel | Pan head captive machine screws for precision instruments (miniature screws) | Cross Recessed Pan Head Captive Machine Screws | Phillips Pan Head Captive Screws - SUS316L | Phillips Pan Head Captive Screws - Brass | Cross Recessed Truss Head Captive Screws |
| Part Number | SSC-SNST | SSC-SNSTG | SSC-SNHS | SSC-SNHL | SSCZS | SSCPS | SSCPL | SSCPB | SSCMS |
| Feature | Lightweight Non-magnetic Chemical Resistance Captive / Loss Prevention |
High Strength Lightweight Non-magnetic Corrosion Resistance Captive / Loss Prevention |
Captive / Loss Prevention |
Captive / Loss Prevention |
For Precision Instruments Captive / Loss Prevention |
Pan Head Machine Screws Captive / Loss Prevention |
Pan Head Machine Screws Captive / Loss Prevention |
Pan Head Machine Screws Captive / Loss Prevention |
Truss Head Screws Captive / Loss Prevention |
| Price | From 12.02 USD | From 28.81 USD | From 3.41 USD | From 4.64 USD | From 5.90 USD | From 3.90 USD | From 5 USD | From 3.95 USD | From 4.02 USD |
| Material | Grade 2 Titanium | Grade 5 Titanium | SUSXM7 (Equivalent to SUS304) | SUS316L | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) | SUS316L | Brass | SUSXM7 (Equivalent to SUS304) |
| Surface Treatment | Special Chemical Polishing | - | - | - | - | - | - | - | - |
| Thread Size | M3 ～ M6 | M3 ～ M8 | M3 ～ M8 | M3 ～ M8 | M1.4 ～ M2.6 | M3 ～ M8 | M3 ～ M8 | M3 ～ M8 | M3 ～ M8 |
| Operating Temperature (℃) | - | - | - | - | - | - | - | - | - |
| CAD | CAD | CAD | CAD | CAD | CAD | CAD | CAD | CAD | CAD |
| Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications |
| List | SSC-SNST-M3 SSC-SNST-M4 SSC-SNST-M5 SSC-SNST-M6 | SSC-SNSTG-M3 SSC-SNSTG-M4 SSC-SNSTG-M5 SSC-SNSTG-M6 SSC-SNSTG-M8 | SSC-SNHS-M3 SSC-SNHS-M4 SSC-SNHS-M5 SSC-SNHS-M6 SSC-SNHS-M8 | SSC-SNHL-M3 SSC-SNHL-M4 SSC-SNHL-M5 SSC-SNHL-M6 SSC-SNHL-M8 | SSCZS-M1.4 SSCZS-M1.6 SSCZS-M1.7 SSCZS-M2 SSCZS-M2.5 SSCZS-M2.6 | SSCPS-M3 SSCPS-M4 SSCPS-M5 SSCPS-M6 SSCPS-M8 | SSCPL-M3 SSCPL-M4 SSCPL-M5 SSCPL-M6 SSCPL-M8 | SSCPB-M3 SSCPB-M4 SSCPB-M5 SSCPB-M6 SSCPB-M8 | SSCMS-M3 SSCMS-M4 SSCMS-M5 SSCMS-M6 SSCMS-M8 |
