Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

CHICAGO-LATROBE Straight Flute Tap: 1/4"-20 UNC, H3 / 2B, 4 Flute, Plug Chamfer, LH (MPN 317516) - Left-Hand Thread Taps
CHICAGO-LATROBELeft-Hand Thread Taps

CHICAGO-LATROBE Straight Flute Tap: 1/4"-20 UNC, H3 / 2B, 4 Flute, Plug Chamfer, LH (MPN 317516)

The CHICAGO-LATROBE Straight Flute Tap (SKU 3G-OTH-265148) is a left-hand thread tap for 1/4"-20 UNC threads, featuring an H3 / 2B tolerance, 4 flutes, and a plug chamfer. This OEM-sourced tool is part of our curated…

SKU 3G-OTH-265148

Brand
CHICAGO-LATROBE
Item
Straight Flute Tap: 1/4"-20 UNC, H3 / 2B, 4 Flute, Plug Chamfer, LH
Category
Left-Hand Thread Taps
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

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
317516
Type
H3 / 2B, Plug Chamfer, LH
Flute
4

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

The CHICAGO-LATROBE Straight Flute Tap (SKU 3G-OTH-265148) is a left-hand thread tap for 1/4"-20 UNC threads, featuring an H3 / 2B tolerance, 4 flutes, and a plug chamfer. This OEM-sourced tool is part of our curated industrial supply across 14 departments, with specialist depth in cutting tools and machining.

Frequently Asked Questions

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

This left-hand thread tap is used to cut internal 1/4"-20 UNC threads in metal parts, typically for applications requiring reverse-thread fasteners. It is a standard tool in machining and maintenance operations across industrial sectors.

What are the specifications of the CHICAGO-LATROBE Straight Flute Tap?

The tap has a 1/4"-20 UNC thread size, H3 / 2B tolerance, 4 flutes, and a plug chamfer. It is left-hand (LH) threaded, with manufacturer part number 317516. These specs ensure precise thread cutting in through or blind holes.

Where to buy CHICAGO-LATROBE Straight Flute Tap worldwide?

3G Electric supplies and delivers the CHICAGO-LATROBE Straight Flute Tap worldwide. We handle full logistics and customs clearance, sourcing genuine OEM tools like this 1/4"-20 UNC left-hand tap for global industrial customers.

How to select the correct tap for left-hand threads?

For left-hand threads, ensure the tap is marked LH and matches the required thread size and pitch, such as 1/4"-20 UNC. Verify the chamfer type (plug for general use) and tolerance (H3 for standard fit). Always confirm material compatibility 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 left-hand thread taps. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Burners & Combustion Pumps & Compressors Spare Parts All Products

Compatible alternatives & equivalents

Cross-referenced by specification & description
CHICAGO-LATROBE Straight Flute Tap: 3/8"-24 UNF, H3 / 2B, 4 Flute, Plug Chamfer, LH (MPN 317664)
CHICAGO-LATROBE
CHICAGO-LATROBE Straight Flute Tap: 3/8"-24 UNF, H3 / 2B, 4 Flute, Plug Chamfer, LH (MPN 317664)
CHICAGO-LATROBE Straight Flute Tap: 3/4"-10 UNC, H3 / 2B, 4 Flute, Plug Chamfer, LH (MPN 317995)
CHICAGO-LATROBE
CHICAGO-LATROBE Straight Flute Tap: 3/4"-10 UNC, H3 / 2B, 4 Flute, Plug Chamfer, LH (MPN 317995)
General purpose hand tap for cutting internal threads in metal, plastic, and composite materials. Features a 1/4"-20 UNC thread size, H3 / 2B tolerance, 4 flutes, and plug chamfer for through-hole and blind-hole applications. Suitable for maintenance, repair, and production environments
CHICAGO-LATROBE
General purpose hand tap for cutting internal threads in metal, plastic, and composite materials. Features a 1/4"-20 UNC thread size, H3 / 2B tolerance, 4 flutes, and plug chamfer for through-hole and blind-hole applications. Suitable for maintenance, repair, and production environments
General purpose hand tap for cutting internal threads in metal components. Features 1/4"-20 UNC thread size, H3 / 2B tolerance, 4 flutes, and plug chamfer. Straight flute design suitable for through-hole or blind-hole tapping in machining, maintenance, and fabrication applications
CHICAGO-LATROBE
General purpose hand tap for cutting internal threads in metal components. Features 1/4"-20 UNC thread size, H3 / 2B tolerance, 4 flutes, and plug chamfer. Straight flute design suitable for through-hole or blind-hole tapping in machining, maintenance, and fabrication applications

More from CHICAGO-LATROBE

View all CHICAGO-LATROBE parts
CHICAGO-LATROBE Straight Flute Tap: 3/4"-16 UNF, H3 / 2B, 4 Flute, Plug Chamfer, LH (MPN 318027)
CHICAGO-LATROBE
CHICAGO-LATROBE Straight Flute Tap: 3/4"-16 UNF, H3 / 2B, 4 Flute, Plug Chamfer, LH (MPN 318027)
Left-hand thread tap for cutting internal UNF threads in metal components. Features H3 / 2B tolerance, 4 flutes, and plug chamfer. Suitable for through or blind holes requiring left-hand threads in reverse-thread fastener applications
CHICAGO-LATROBE
Left-hand thread tap for cutting internal UNF threads in metal components. Features H3 / 2B tolerance, 4 flutes, and plug chamfer. Suitable for through or blind holes requiring left-hand threads in reverse-thread fastener applications
Left-hand thread tap for cutting internal threads in blind or through holes. Features H3 / 2B tolerance, 4 flutes, and plug chamfer. Suitable for maintenance, repair, and production applications requiring left-hand threads
CHICAGO-LATROBE
Left-hand thread tap for cutting internal threads in blind or through holes. Features H3 / 2B tolerance, 4 flutes, and plug chamfer. Suitable for maintenance, repair, and production applications requiring left-hand threads
Left-hand thread tap for cutting internal UNF threads in through or blind holes. Features H3 tolerance for 2B class fit, 4-flute design for chip evacuation, and plug chamfer. Suitable for manual or machine tapping in ferrous and non-ferrous materials
CHICAGO-LATROBE
Left-hand thread tap for cutting internal UNF threads in through or blind holes. Features H3 tolerance for 2B class fit, 4-flute design for chip evacuation, and plug chamfer. Suitable for manual or machine tapping in ferrous and non-ferrous materials
Left-hand thread tap for cutting internal UNC threads. Features H3 / 2B tolerance, 4 straight flutes, and plug chamfer for through-hole threading. Suitable for general-purpose threading in ferrous and non-ferrous materials
CHICAGO-LATROBE
Left-hand thread tap for cutting internal UNC threads. Features H3 / 2B tolerance, 4 straight flutes, and plug chamfer for through-hole threading. Suitable for general-purpose threading in ferrous and non-ferrous materials
CHICAGO-LATROBE Straight Flute Tap: 1/2"-13 UNC, H3 / 2B, 4 Flute, Plug Chamfer, LH (MPN 317755)
CHICAGO-LATROBE
CHICAGO-LATROBE Straight Flute Tap: 1/2"-13 UNC, H3 / 2B, 4 Flute, Plug Chamfer, LH (MPN 317755)
CHICAGO-LATROBE Straight Flute Tap: 5/8"-18 UNF, H3 / 2B, 4 Flute, Plug Chamfer, LH (MPN 317904)
CHICAGO-LATROBE
CHICAGO-LATROBE Straight Flute Tap: 5/8"-18 UNF, H3 / 2B, 4 Flute, Plug Chamfer, LH (MPN 317904)
CHICAGO-LATROBE Straight Flute Tap: 1/2"-20 UNF, H3 / 2B, 4 Flute, Plug Chamfer, LH (MPN 317789)
CHICAGO-LATROBE
CHICAGO-LATROBE Straight Flute Tap: 1/2"-20 UNF, H3 / 2B, 4 Flute, Plug Chamfer, LH (MPN 317789)