16NR 1.75 ISO T250 Internal Threading Insert Premium Grade

Our Price:	£3.60
List Price:	~~£5.40~~
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(Exc. 20% VAT)(£4.32 Inc. VAT)

Model: 16NR1.75ISOT250
Brand: APT Threading

Shipped Weight: 7 g

Availability:

In stock, immediate despatch

APT Threading

Threading Inserts Fully Ground with High Quality PVD Coatings, Quality Machine Taps and Thread Milling Cutters

16NR 1.75 ISO T250, 1.75mm pitch full form ISO metric internal threading Insert in grade T250.

Grade T250 is micro-grain carbide and is our preimium grade for all types of steel including carbon, alloy and hardened steel also good for cast iron and stainless good choice for general use.

Micrograin carbide provides increased wear resistance and improved tool life.

This bronze colour PVD coated grade covers P25, M25, K30, S15, H10 range of materials.

General Cutting parameters

Material	Hardness HB	Cutting Speed VC: m/min	Number of Passes	Application Choice
Non alloyed steel 0-0.45℅ C	125-170	90-190 (140)	7-12	Good
Low alloyed steel	180-350	70-140 (100)	7-12	Good
High alloyed steel	200-325	50-120 (90)	7-12	Good
Corrosion resistant steel	200	60-130 (100)	7-12	Good
Stainless - Ferritic	200-330	60-130 (100)	7-12	OK but try grade T350
Stainless - Austenitic	180-200	40-140 (90)	7-12	OK but try grade T350
Stainless - Cast Ferritic	200-330	60-120 (90)	7-12	OK but try grade T350
Stainless - Cast Austenitic	200-330	60-110 (80)	7-12	OK but try grade T350
Grey cast iron	180-260	60-130 (100)	7-12	OK
Spheroidal cast iron	160-260	90-160 (120)	7-12	OK
Malleable / Tempered iron	130-230	60-100 (70)	7-12	OK
Aluminium Wrought Alloys	60-100	80-370 (220)	7-12	OK but try grade AK10
Aluminium Castings Si<12%	80-90	200-360 (280)	7-12	OK but try grade AK10
Aluminium Alloys Si 12%-23%	130	60-180 (120)	7-12	OK but try grade AK10
Bronze & Brass	90-100	80-250 (170)	7-12	OK but try grade AK10
Iron Based Hi-temp Alloys 200-280 HB	200-280	30-60 (45)	7-12	OK but try grade T350
Nickel or Cobalt Based 250 HB	250	20-30 (25)	7-12	OK but try grade T350
Nickel or Cobalt Based 30-58 HRC	350	15-25 (20)	7-12	OK but try grade T350
Pure Titanium	400Rm	140-170 (150)	7-12	OK but try grade T350
Titanium Alpha + Beta Alloys	1050Rm	50-70 (60)	7-12	OK but try grade T350
Hardened Steel	40-50HRC	45-60 (50)	7-12	OK
Hardened Steel	50-55HRC	40-50 (45)	7-12	OK

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