What sizes does this cover?

The Socket & Wrench Size pack covers standard metric hex bolts from M3 to M36 and imperial hex bolts from 1/4" to 1-1/2". These are the most common sizes in hardware stores and automotive work.

Are these sizes guaranteed correct?

Sizes are based on ISO and SAE standards for standard hex head bolts and nuts. Actual fasteners vary by manufacturer, grade, and application. Always verify with the fastener when precision matters.

What about Torx, spline, or specialty fasteners?

This tool covers hex head fasteners only. Torx, spline, 12-point, and other drive types are not yet supported.

Can I use the nearest imperial socket on a metric bolt?

In a pinch it may work, but risks rounding the fastener head. Use the correct socket whenever possible. Related values shown are for reference, not substitution.

Will more packs be added?

Yes. Pilot Hole, Tap Drill, and Metric/Imperial conversion packs are planned. The architecture supports new reference sets without changing the app.

T20 Torx Bit — 3.95mm

A T20 Torx (star) bit measures 3.95mm point-to-point. Commonly used with M4 screws.

Result

Answer

T20 Torx bit

Standard

BuyT20 bit Budget set Pro set

Torx SizeT20

Point-to-Point3.95mm

Common FastenersM4 screws

Security VariantT20 Tamperproof (center pin)

Bit Shank1/4" hex

A T20 Torx bit fits M4 screws and measures 3.95mm point-to-point. Automotive trim, appliances, furniture, deck screws.

Note

Reference value from published fastener data. Always verify with the fastener manufacturer for critical applications.

Related Sizes

← T15 (3.35mm)T25 (4.5mm) →

About T20 Torx Bits

A T20 Torx (star) bit measures 3.95mm point-to-point and fits a standard 1/4" hex shank driver. Common fasteners: M4 screws. Automotive trim, appliances, furniture, deck screws. A security (tamperproof) variant with a center pin is available — standard T20 bits will not fit security fasteners. T20 is widely available at hardware stores and online.

← Look up another Torx size