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CHICAGO-LATROBE Extension Tap: 1/4"-20 UNC, H11, 3 Flute, Plug Chamfer - Spiral-Point Extension Taps
CHICAGO-LATROBESpiral-Point Extension Taps

CHICAGO-LATROBE Extension Tap: 1/4"-20 UNC, H11, 3 Flute, Plug Chamfer

The CHICAGO-LATROBE Extension Tap (1/4"-20 UNC, MPN 313599) is a spiral-point extension tap with a plug chamfer, black oxide high-speed steel construction, and 3 flutes. It is an H11 type tool designed for threading…

SKU 3G-OTH-313656

Brand
CHICAGO-LATROBE
Item
Extension Tap: 1/4"-20 UNC, H11, 3 Flute, Plug Chamfer
Category
Spiral-Point Extension Taps
Available to Order
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Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

Technical Specifications

CHICAGO-LATROBE
Manufacturer Part Number
313599
Type
H11, Plug Chamfer, Black Oxide High Speed Steel
Flute
3

Technical Documents

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CHICAGO-LATROBE Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The CHICAGO-LATROBE Extension Tap (1/4"-20 UNC, MPN 313599) is a spiral-point extension tap with a plug chamfer, black oxide high-speed steel construction, and 3 flutes. It is an H11 type tool designed for threading operations in industrial applications.

Frequently Asked Questions

What is a CHICAGO-LATROBE extension tap used for?

A CHICAGO-LATROBE extension tap is used to cut internal threads in deep or hard-to-reach holes. The extended shank allows access where standard taps cannot reach, making it ideal for maintenance, repair, and production work across machining and industrial applications.

What are the specifications of the CHICAGO-LATROBE 1/4"-20 UNC extension tap?

This CHICAGO-LATROBE extension tap has a 1/4"-20 UNC thread size, H11 tolerance, 3 flutes, and a plug chamfer. It is made from black oxide high-speed steel (MPN 313599). These specs ensure precise threading in steel and other materials.

Where to buy CHICAGO-LATROBE extension taps worldwide?

3G Electric supplies CHICAGO-LATROBE extension taps worldwide. As a global industrial solutions provider, we handle full logistics, customs clearance, and delivery to your facility. Contact us to order the 1/4"-20 UNC tap (SKU 3G-OTH-313656) or other sizes.

How to select the right extension tap for deep hole threading?

Select an extension tap like this CHICAGO-LATROBE 1/4"-20 UNC model based on thread size, material (black oxide HSS for steel), and reach needed. Match the chamfer type (plug for through holes) and flute count (3 for chip clearance) to your application for best results.

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 spiral-point extension taps. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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Compatible alternatives & equivalents

Cross-referenced by specification & description
CHICAGO-LATROBE Extension Tap: 3/8"-16 UNC, H11, 3 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 313601)
CHICAGO-LATROBE
CHICAGO-LATROBE Extension Tap: 3/8"-16 UNC, H11, 3 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 313601)
CHICAGO-LATROBE Extension Tap: 1/4"-20 UNC, H11, 3 Flute, Plug Chamfer, High Speed Steel (MPN 313544)
CHICAGO-LATROBE
CHICAGO-LATROBE Extension Tap: 1/4"-20 UNC, H11, 3 Flute, Plug Chamfer, High Speed Steel (MPN 313544)
CHICAGO-LATROBE Extension Tap: 1/2"-13 UNC, H11, 3 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 313603)
CHICAGO-LATROBE
CHICAGO-LATROBE Extension Tap: 1/2"-13 UNC, H11, 3 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 313603)
CHICAGO-LATROBE Extension Tap: 5/8"-11 UNC, H11, 3 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 313604)
CHICAGO-LATROBE
CHICAGO-LATROBE Extension Tap: 5/8"-11 UNC, H11, 3 Flute, Plug Chamfer, Black Oxide High Speed Steel (MPN 313604)
Spiral-point extension tap for threading blind or through holes in metal where standard taps cannot reach. Features H11 tolerance, plug chamfer, 3 flutes, and high-speed steel construction. Suitable for deep or recessed areas requiring precise UNC threads
CHICAGO-LATROBE
Spiral-point extension tap for threading blind or through holes in metal where standard taps cannot reach. Features H11 tolerance, plug chamfer, 3 flutes, and high-speed steel construction. Suitable for deep or recessed areas requiring precise UNC threads
CHICAGO-LATROBE Extension Tap: 3/8"-16 UNC, H11, 3 Flute, Plug Chamfer, High Speed Steel (MPN 313546)
CHICAGO-LATROBE
CHICAGO-LATROBE Extension Tap: 3/8"-16 UNC, H11, 3 Flute, Plug Chamfer, High Speed Steel (MPN 313546)

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