S16Q-STWNR16 Internal Turning Tool Holder - 16mm Diameter, Alloy Steel

$16.84 USD

Overview: The S16Q-STWNR16 is a robust internal turning tool holder designed for CNC machining applications. Made from high-quality alloy steel, it ensures durability and reliability in precision turning operations. With...

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BEYOND STWNR/L Boring Bar | Screw Clamp CNC Turning Toolholder

BEYOND STWNR/L CNC Boring Bar – Screw Clamp External Turning Toolholder

The BEYOND STWNR/L boring bar series is designed for high-stability external turning using the screw-clamp (S-type) insert holding system. Manufactured with a durable steel shank, these toolholders follow ISO coding standards and are optimized for TNMG turning inserts. Suitable for general steel, alloy steel, stainless steel, and cast iron machining.

ISO Code Interpretation

ISO Position	Meaning	Description
1st Letter	Type of Bar	S = Steel shank (A: steel w/ coolant; E: carbide head; C: carbide shank; X: special)
2 Numbers	Bar Diameter	Shank size in mm (e.g., 16 = 16 mm, 20 = 20 mm, 25 = 25 mm)
Next Letter	Bar Length Code	A:32, B:40, C:50, D:60, E:70, F:80, G:90, H:100, J:110, JX:120, K:125, L:140, M:150, N:160, P:170, Q:180, R:200, S:250, T:300, U:350, V:400, W:450, Y:500, X: Special
Letter after hyphen (1st)	Clamping Method	S = Screw clamp
Letter after hyphen (2nd)	Insert Shape	T = Triangle
Letter after hyphen (3rd)	Cutting Edge Angle	W = 60° entering angle
Letter after hyphen (4th)	Insert Relief Angle	N = 0° Negative (B:5°, C:7°, D:15°, E:20°, P:11°)
Letter after hyphen (5th)	Hand of Tool	R = Right-hand, L = Left-hand, N = Neutral
Last Digits	Insert Cutting Edge Length	Typically 16 → TNMG16 inserts

Compatible Inserts

This toolholder uses **TNMG + last two digits** insert specification:

SxQ-STWNR16 → TNMG16
SxQ-STWNL16 → TNMG16

Recommended Insert Models:

TNMG160404
TNMG160408
TNMG160412
TNMG160408-PM / PF / MA (depending on material)

Available STWNR/L Boring Bar Models

Model	Shank Diameter (mm)	Length Code	Hand	Insert Size	Clamping
S16Q-STWNR16	16	Q = 180 mm	R (Right-hand)	TNMG16	Screw Clamp (S)
S16Q-STWNL16	16	Q = 180 mm	L (Left-hand)	TNMG16	Screw Clamp (S)
S20R-STWNR16	20	R = 200 mm	R	TNMG16	Screw Clamp
S20R-STWNL16	20	R = 200 mm	L	TNMG16	Screw Clamp
S25S-STWNR16	25	S = 250 mm	R	TNMG16	Screw Clamp
S25S-STWNL16	25	S = 250 mm	L	TNMG16	Screw Clamp

Key Features

ISO-standard STWNR/L external turning boring bar
Durable steel shank for high rigidity and stability
Screw-clamp system ensures reliable insert retention
Optimized for TNMG triangular negative inserts
Suitable for roughing and semi-finishing
Excellent chip evacuation and vibration resistance
Ideal for CNC lathes and automatic turning centers

Applications

General steel turning (AISI 1045, 4140, 1020, etc.)
Alloy steel and tool steel
Stainless steel (304/316/420)
Cast iron machining (FC/ FCD)
Medium-depth external profiling & facing

Search Keywords

STWNR boring bar, STWNL toolholder, TNMG toolholder, CNC turning holder, screw clamp turning bar, external turning tool, steel shank toolholder, ISO turning tool, lathe turning bar, TNMG16 holder, negative insert toolholder, BEYOND toolholder, CNC boring bar steel shank.