Diehl Tool Steel Abbreviations

STEEL SURFACE CONDITIONS:

Abbreviation Meaning
CD FL COLD DRAWN FLAT ON-SIZE MATERIAL COLD DRAWN BAR STOCK
CD RD COLD DRAWN FLAT ON-SIZE MATERIAL COLD DRAWN BAR STOCK
CRS FL COLD ROLLED STEEL FLATS ON-SIZE BAR STOCK COLD FINISH
CRS RD COLD ROLLED STEEL ROUNDS ON-SIZE BAR STOCK COLD FINISH
DR DRILL ROD CENTERLESS GROUND ROUNDS +/- .001(SMALL SIZES +/-.0005) LENGTHS COME 36” STANDARD, 144” ALSO AVAILABLE METRIC DIAMETERS AVAILABLE  UP TO 25 MM
FG OS PRECISION GROUND GAGE STOCK- OVERSIZE TOLERANCES + .010 TO + .015 ON THICKNESS AND WIDTH SPINDLE GROUND FINISH
FG REG PRECISION GROUND GAGE STOCK- ON-SIZE TOLERANCES +/-.001 THICKNESS   + .005 -.000 WIDTH SPINDLE GROUND FINISH
HB HOLLOW BAR TURNED AND BORED HOLLOW ROUND STOCK USUALLY PROVIDED WITH ALLOWANCE TO FINISH TO CUSTOMER  SPECS
HG RD HARDENED GROUND ROUND TOL. UNDER 1/8” DIA (+.000 -.0005);  OVER 1/8”DIA ( +.000 -.001) MATERIAL HAS BEEN HEAT TREATED A-2   59-62 Rc M-2  63-66 Rc
HR BO FL HOT ROLL BURN OUT FLAT HOT ROLLED FINISH, NOT MACHINED.   BURNED BY FLAME CUTTING TO ANY SHAPE.
HR BO RD HOT ROLLED BURN OUT ROUND HOT ROLLED FINISH, NOT MACHINED BURNED BY FLAME CUTTING INTO A RING FROM PLATE.
HR FL HOT ROLL FLAT HOT ROLLED PLATE PRODUCT, CUT TO SIZE
HR RD HOT ROLL ROUND ROUND BARS  MANUFACTURED BY HOT ROLLING. FINISH IS NOT MACHINED APPROX. TOL.  +/- .010
PM BO FL PRE-MACHINED BURN-OUT FLAT MATERIAL IS BURNED FROM PLATE, THEN GROUND TOP AND BOTTOM TO CUSTOMER SPECS.
PM BO RD PRE-MACHINED BURN-OUT ROUND RINGS BURNED FROM PLATE, THEN GROUND TOP AND BOTTOM TO CUSTOMER SPECS.
PM FL PRE-MACHINED FLATS DECARB FREE MATERIAL, CUT FROM PLATE THICKNESS GROUND OVERSIZE +.015 TO +.035, SAW CUT +1/16 TO + 1/8” WIDTH AND LENGTH
RT RD ROUGH TURNED ROUND DECARB FREE ROUNDS, TURNED OVERSIZE +.015 TO +.030” LARGER DIAMETERS +1/16 TO +1/4”
SC FL SAW CUT FLATS RECTANGLES WHICH ARE COLD SAW CUT ON ALL DIMENSIONS FROM LARGER BLOCKS.  TOL. +1/16 TO + 1/8” ALL DIMENSIONS.
SG FL SPECIAL GROUND FLATS FLAT BAR STOCK GROUND TO CUSTOMER SPECS
SG RD SPECIAL GROUND ROUNDS ROUND BARS GROUND TO CUSOTMERS SPECIFICATIONS.
TGP RD TURNED, GROUND AND POLISHED ROUNDS TOL. +.000/-.002 TO -.004”

 

Steel Hardness Conditions

Abbreviation Meaning
ANLD ANNEALED FULLY ANNEALED MATERIAL USUALLY NO MORE THAN 17-22 Rc MAXIMUM HARDNESS
PHT PRE-HEAT TREATED OR PRE-HARD HEAT TREATED TO MID HARDNESS OF 27-35 Rc
SR STRESS RELIEVED HEAT TREATED TO TAKE OUT STRESSES WITHOUT FULLY ANNEALING.
POWDER POWDER METAL TOOL STEEL SPECIALIZED MELTING PROCESS FOR STEEL INGOTS THAT PRODUCES A SUPERIOR MICROSTRUCTURE. POWDER METAL TECHNOLOGY IS USED PRIMARILY IN THE VERY HIGHLY ALLOYED GRADES SUCH AS HIGH SPEED TOOL STEEL. SOLD IN ANNEALED CONDITION.
P-20 32 P-20 MATERIAL THAT HAS MINIMUM HARDNESS OF 32 Rc
P-20 36 P-20 MATERIAL THAT HAS A MINIMUM HARDNESS OF 36 Rc
P-20 HI-HARD P-20 MATERIAL HEAT TREATED TO 38-42 Rc
P-20 PHT P-20 MATERIAL HEAT TREATED TO 27-35 Rc
Data is typical and should not be construed as actual values for any category.
Applications and technical information require engineers and tool designers to exercise independent judgement.