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.

1-3/8" → 34mm Metric

The nearest metric equivalent of 1-3/8" is 34mm (0.93mm difference).

Result

Answer

34mm (34mm)

Common

Buy35mm socket metric conversion set Metric + SAE combo set

Input Size1-3/8" (34.93mm)

Nearest Metric34mm (34mm)

Difference0.93mm

Second Nearest36mm (36mm, 1.07mm off)

SystemImperial → Metric

A 1-3/8" socket or wrench (34.93mm) is closest to 34mm metric, a difference of 0.93mm. The gap is significant — using the metric size risks rounding the fastener. Use the correct imperial socket.

Note

The 0.93mm difference may cause the socket to slip or round the fastener head. Use the correct imperial size whenever possible.

Related Sizes

← 1-5/16"1-7/16" →

About 1-3/8" Conversion

A 1-3/8" imperial socket or wrench (34.93mm) is closest to 34mm metric, with a difference of 0.93mm. The gap between sizes is significant — using the metric substitute risks rounding the fastener head. Always use the correct imperial socket. The second-nearest metric size is 36mm (36mm, 1.07mm off). Heavy equipment. A combination metric and SAE socket set is the best way to handle mixed fasteners without risking damage.

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