CHICAGO-LATROBEGeneral Purpose Hand Taps

CHICAGO-LATROBE Straight Flute Hand Tap: 1/4"-20 UNC, H3 / 2B, 3 Flute, Plug Chamfer (MPN 173145)

The CHICAGO-LATROBE Straight Flute Hand Tap (SKU 809Z73, MPN 173145) is a general-purpose hand tap with a 1/4"-20 UNC thread size. It features an H3 / 2B tolerance, a plug chamfer, and 3 flutes for standard threading…

SKU 3G-OTH-221785

Brand

CHICAGO-LATROBE

Item

Straight Flute Hand Tap: 1/4"-20 UNC, H3 / 2B, 3 Flute, Plug Chamfer

Technical Specifications

CHICAGO-LATROBE

Manufacturer Part Number

173145

Type

H3 / 2B, Plug Chamfer 

Flute

3

View Full Spec Sheet

Technical Documents

No technical documents available for this product.

Request documentation →

Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.

Talk to an engineer

Ask a question

CHICAGO-LATROBE Products

3G Electric (S) Pte. Ltd. — Singapore

Product Description

Supplied to the Philippines — compatible with 60 Hz installations. DHL Express delivery to Manila, Quezon City, Cebu, customs and duties handled door-to-door.

Frequently Asked Questions

What is the CHICAGO-LATROBE Straight Flute Hand Tap used for?

This hand tap is used for cutting internal threads in metal components. It is ideal for general-purpose threading applications in maintenance, repair, and production environments, particularly for creating 1/4"-20 UNC threads in through or blind holes.

What are the specifications of the CHICAGO-LATROBE 173145 hand tap?

The CHICAGO-LATROBE 173145 is a straight flute hand tap with a 1/4"-20 UNC thread size, H3 / 2B tolerance, 3 flutes, and a plug chamfer. It is designed for general-purpose threading and is made by CHICAGO-LATROBE.

Where to buy CHICAGO-LATROBE hand taps worldwide?

You can source CHICAGO-LATROBE hand taps worldwide through 3G Electric. We handle full logistics, customs clearance, and delivery to global destinations. Contact us for availability and lead times on this and other industrial tooling.

How to select the correct hand tap for UNC threads?

Select a hand tap that matches the thread size and pitch, such as 1/4"-20 UNC. For general use, choose a plug chamfer tap with H3 tolerance for standard fit. Ensure the tap has the correct number of flutes for chip evacuation in your material.

Used in

Common applications for CHICAGO-LATROBE

Aerospace assembly — Chicago-Latrobe NAS 907 Type B aircraft-extension drill bits for drilling fastener holes in aluminum and titanium skins.

Metal fabrication — Chicago-Latrobe reduced-shank drill bit sets for enlarging holes in structural steel using magnetic drill presses.

Maintenance repair — Chicago-Latrobe left-hand cobalt jobber-length drill bits for removing broken bolts in machinery.

Tool and die making — Chicago-Latrobe jobber-length drill bit sets with 135° split point for precision hole drilling in hardened steels.

Automotive repair — Chicago-Latrobe spiral-flute screw extractors for removing seized fasteners in engine blocks or exhaust systems.

General manufacturing — Chicago-Latrobe HSS jobber-length drill bits for production drilling in mild steel and cast iron.

CHICAGO-LATROBE Products

3G Electric supplies CHICAGO-LATROBE general purpose hand taps. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

Browse all CHICAGO-LATROBE products →Contact our engineers →