#8915 Screw Slot Penetration Gage
The #8915 Screw Slot Penetration Gage is a precision inspection tool designed to measure slot penetration depth and recess conformity in slotted head screws.
Engineered for compliance with ANSI B107.600 and ASME B18.6.4 / B18.6.5M standards, the 8915 Series verifies slot depth and dimensional consistency in both metric and inch slotted fasteners.
This gage is designed for:
• Slotted machine screws
• Slotted cap screws
• Slotted set screws
• International slotted head fasteners
The 8915 Series provides accurate penetration depth measurement using a dial indicator assembly mounted to a hardened precision ground probe.
Available for:
Metric slot screw sizes M2 through M10Inch slot screw sizes #1 through 1/2 inch
The system ensures proper driver engagement depth, prevents insufficient recess formation, and supports production quality control programs.
SPC-compatible digital indicators are available upon request.
Each gage probe is heat treated, thermally stabilized, and surface treated to maximize wear resistance and extend gage life.
Long form calibration certificates provide traceability to the National Institute of Standards and Technology, NIST.
The 8915 Series is ideal for production floor inspection, quality labs, and international fastener manufacturing programs.
1) Standard Compliance
ANSI B107.600ASME B18.6.4ASME B18.6.5MInternational References: ISO, JIS, DIN, IFI, BS, GB
Drive Type: Slotted RecessInspection Type: Penetration Depth MeasurementCalibration: NIST Traceable
2) Inspection Function
The 8915 Series measures:
• Slot penetration depth
• Recess form consistency
• Driver engagement depth
• Compliance with slot dimensional requirements
This gage verifies depth measurement, not GO-NOGO size fit.
Dial indicator readings provide quantitative measurement of recess penetration.
3) Materials & Construction
Universal’s 8915 Series gages feature:
• Hardened precision ground slot probe
• Thermally stabilized alloy steel
• Surface treated wear-resistant finish
• Knurled handle body
• High accuracy dial indicator assembly
• SPC digital option available
Designed for high-volume production inspection environments.
4) Calibration & Traceability
All gages include:
• Calibration to specified dimensional tolerances
• Long form calibration certificates available
• Traceability to NIST
SPC-compatible digital indicators support statistical process control programs.
5) Ordering Information
When ordering, specify:
• Inch or Metric system
• Dial or Digital indicator
• Applicable fastener standard
• Size range
