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engine theory - Air trapped inside threaded "blind" hole vs. hole integrity - Motor Vehicle Maintenance & Repair Stack Exchange
![(5pcs) 304 Stainless Steel Hexagon Hollow Threaded Through Hole Suit Bolts for Fasteners Locking Devices Fixed M8x16mm Aperture (4.2mm). (5pcs) 304 Stainless Steel Hexagon Hollow Threaded Through Hole Suit Bolts for Fasteners Locking Devices Fixed M8x16mm Aperture (4.2mm).](https://m.media-amazon.com/images/I/513r98UHiXL._AC_UF894,1000_QL80_.jpg)
(5pcs) 304 Stainless Steel Hexagon Hollow Threaded Through Hole Suit Bolts for Fasteners Locking Devices Fixed M8x16mm Aperture (4.2mm).
![PATIKIL M14x25mm Hollow External Hexagon Screw, 1 Set Cylindrical Lamp Threading Socket Screws Through Hole Bolt with Nut 304 Stainless Steel : Amazon.co.uk: DIY & Tools PATIKIL M14x25mm Hollow External Hexagon Screw, 1 Set Cylindrical Lamp Threading Socket Screws Through Hole Bolt with Nut 304 Stainless Steel : Amazon.co.uk: DIY & Tools](https://m.media-amazon.com/images/I/61GfuoG7z6L._AC_UF1000,1000_QL80_DpWeblab_.jpg)
PATIKIL M14x25mm Hollow External Hexagon Screw, 1 Set Cylindrical Lamp Threading Socket Screws Through Hole Bolt with Nut 304 Stainless Steel : Amazon.co.uk: DIY & Tools
![(2pcs) 304 Stainless Steel Hexagon Hollow Threaded Through Hole Suit Bolts, for fitting mechanical shaft fasteners, M12x35mm Aperture (6.2mm). (2pcs) 304 Stainless Steel Hexagon Hollow Threaded Through Hole Suit Bolts, for fitting mechanical shaft fasteners, M12x35mm Aperture (6.2mm).](https://m.media-amazon.com/images/I/51AwDOkdd3L._AC_UF1000,1000_QL80_.jpg)
(2pcs) 304 Stainless Steel Hexagon Hollow Threaded Through Hole Suit Bolts, for fitting mechanical shaft fasteners, M12x35mm Aperture (6.2mm).
![20 Set M6(6mm)X10mm Hollow External Hexagon Screw 304 Stainless Steel Lamp Threading Screws Through Hole Bolt 【Whit nuts】 : Amazon.co.uk: DIY & Tools 20 Set M6(6mm)X10mm Hollow External Hexagon Screw 304 Stainless Steel Lamp Threading Screws Through Hole Bolt 【Whit nuts】 : Amazon.co.uk: DIY & Tools](https://m.media-amazon.com/images/I/51rljy+aLZL.jpg)