GN 653.2 Flat Knurled Thumb Screws Steel, with Recessed Stud for Loss Protection


Product description


GN 653.2 flat knurled thumb screws can be used to prevent loss of the screw due to the d4 recessed portion of the stud.

When using, instead of a typical tapped and bored hole, it is necessary to provide tapped bores with a thread d1 on each of the two elements to be assembled. Additionally, a clearance bore of d5 on one or both sides must be cut.

Depending on the design and required clamping length a1 - a3 of the component being attached, there are a number of assembly options as shown above.


  • Property strength class 5
  • Blackened finish
  • Visible face fine turned

RoHS compliant

Technical drawing

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GN 653.2 Steel Flat Knurled Thumb Screws, with Recessed Stud for Loss Protection sketch

Part Options / Table

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Dimensions in: Inch | Metric
d2d3d4 -0.008d5hkl2l3
M 40.592-44-88-100.630.310.
M 40.674-66-1010-120.630.310.
M 40.756-88-1212-140.630.310.
M 40.838-1010-1414-160.630.310.
M 50.712.5-44-10.510.5-120.790.390.
M 50.794-66-1212-140.790.390.
M 50.876-88-1414-160.790.390.
M 51.028-1212-1616-180.790.390.
M 60.943-66-1313-160.940.470.190.260.310.200.310.12
M 61.026-88-1616-180.940.470.190.260.310.200.310.12
M 61.188-1212-1818-220.940.470.190.260.310.200.310.12
M 61.3412-1616-2222-260.940.470.190.260.310.200.310.12
M 81.184-88-1616-201.180.630.260.330.350.240.390.16
M 81.348-1212-2020-241.180.630.260.330.350.240.390.16
M 81.5012-1616-2424-281.180.630.260.330.350.240.390.16
M 81.6516-2020-2828-321.180.630.260.330.350.240.390.16

Build & Price

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Thread d1
Length l1

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Total US Dollars (net)
Call / Email for Delivery Time
Please note our quantity discounts (US Dollars).
≥ 500$1.71
Prop 65: Not compliant
Cancer and Reproductive Harm -
RoHS: Compliant
This article is RoHS-compliant in application of Annex III., which means it complies with EU Directive 2011/65/EU, including extension (2015/863/EU), for restricting the use of certain hazardous substances in electrical and electronic devices. The Directive regulates the use of hazardous substances in devices and components. The implementation in national law is summarily described with RoHS(Restriction of (the use of certain) hazardous substances)).
Weight: 0.153 lbs
If weight is not listed, please contact our Sales Department for additional information regarding weight.
Phone: 800-877-8351
All Prices are in US Dollars. Taxes Not Included.

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Need Help?

Our service team is available from Monday to Friday between 7:30 AM and 5:00 PM Central Time: 800-877-8351

Special Requests | Contact our sales team

GN 653.2-M8-34-STGN 653.2-M5-20-STGN 653.2-M8-30-STGN 653.2-M8-38-STGN 653.2-M8-42-STGN 653.2-M4-15-STGN 653.2-M6-30-STGN 653.2-M4-21-STGN 653.2-M4-17-STGN 653.2-M6-34-STGN 653.2-M5-26-STGN 653.2-M5-18-STGN 653.2-M4-19-STGN 653.2-M6-24-STGN 653.2-M5-22-STGN 653.2-M6-26-ST

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