Spur Gears
Helical Gears
Internal Gears
Racks
CP Racks & Pinion
Miter Gears
Bevel Gears
Screw Gears
Worm Gears
Gearbox
Other Products
Hardened Ground Racks
(MRGF/MRGFD)
[e] J Series products are also available.
[NOTE] The catalog numbers in the above table with (F) on the end have both ends machined so that they can be butted against each other to make any desired length. The items with (D) have mounting screw holes for easier assembly.
[NOTE1] Precision grade standard of racks are set by KHK. Please see “Precision of Racks” in Selection Hints section for details.
Hardened Ground Racks
(KRGF-H/KRGFD-H)
Heat treated ground gears with high precision and strength, has excellent cost-performance ratio. J Series products are also available.
[NOTE] The catalog numbers in the above table with (F) on the end have both ends machined so that they can be butted against each other to make any desired length. The items with (D) have mounting screw holes for easier assembly.
[NOTE1] Precision grade standard of racks are set by KHK. Please see “Precision of Racks” in Selection Hints section for details.
Thermal Refined Ground Racks
(KRG/KRGF/KRGD)
Have excellent strength and wear resistance which allow your designs to be more compact.
[NOTE] The catalog numbers in the above table with (F) on the end have both ends machined so that they can be butted against each other to make any desired length. The items with (D) have mounting screw holes for easier assembly.
[NOTE1] Precision grade standard of racks are set by KHK. Please see “Precision of Racks” in Selection Hints section for details.
Hardened Ground Racks
(SRG/SRGF/SRGFD/SRGFK)
Reasonably priced ground racks with abrasion-resistant characteristics.
[NOTE1] Precision grade standard of racks are set by KHK. Please see “Precision of Racks” in Selection Hints section for details.
[NOTE1] The catalog numbers in the above table with (F) on the end have both ends machined so that they can be butted against each other to make any desired length. The items with (K)(D) have mounting screw holes for easier assembly.
[NOTE2] Tooth areas, where size is less than 0.8 module, without quenching treatment.
Hardened Racks
(KRF-H/KRFD-H)
[e] J Series products are also available.
[NOTE] The catalog numbers in the above table with (F) on the end have both ends machined so that they can be butted against each other to make any desired length. The items with (D) have mounting screw holes for easier assembly.
[NOTE1] Precision grade standard of racks are set by KHK. Please see “Precision of Racks” in Selection Hints section for details.
Hardened Racks
(SRF-H/SRFD-H)
Reasonably priced heat treated racks with high strength and long life-span, stable for use over a prolonged period. J Series products are also available.
[NOTE] The catalog numbers in the above table with (F) on the end have both ends machined so that they can be butted against each other to make any desired length. The items with (D) have mounting screw holes for easier assembly.
[NOTE1] Precision grade standard of racks are set by KHK. Please see “Precision of Racks” in Selection Hints section for details.
Hardened Racks
(SRF-HL/SRFD-HL)
[NOTE1] Precision grade standard of racks are set by KHK. Please see “Precision of Racks” in Selection Hints section for details.
Thermal Refined Racks
(KRF・KRFD)
Increased strength with SCM440 material which is thermal refined. J Series products are also available.
[NOTE] The catalog numbers in the above table with (F) on the end have both ends machined so that they can be butted against each other to make any desired length. The items with (D) have mounting screw holes for easier assembly.
[NOTE1] Precision grade standard of racks are set by KHK. Please see “Precision of Racks” in Selection Hints section for details.
Racks
(SRAF・SRAFD・SRAFK)
Compared to regular SRF racks, low cost and compact products where tooth width and tooth height are the same size. J Series products are also available.
[NOTE1] Precision grade standard of racks are set by KHK. Please see “Precision of Racks” in Selection Hints section for details.
[NOTE1] The catalog numbers in the above table with (F) on the end have both ends machined so that they can be butted against each other to make any desired length. The items with (K)(D) have mounting screw holes for easier assembly.
Racks
(SR)
Low cost with large selections of modules and numbers of teeth.
[NOTE1] Precision grade standard of racks are set by KHK. Please see “Precision of Racks” in Selection Hints section for details.
Racks with Machined Ends
(SRF)
Low cost with large selections of modules and numbers of teeth.
[NOTE] The catalog numbers in the above table with (F) on the end have both ends machined so that they can be butted against each other to make any desired length.
[NOTE1] Precision grade standard of racks are set by KHK. Please see “Precision of Racks” in Selection Hints section for details.
Racks with Bolts Holes
(SRFD·SRFK)
Low cost with large selections of modules and numbers of teeth.J series products are also available.
[NOTE1] Precision grade standard of racks are set by KHK. Please see “Precision of Racks” in Selection Hints section for details.
[NOTE1] The catalog numbers in the above table with (F) on the end have both ends machined so that they can be butted against each other to make any desired length. The items with (K)(D) have mounting screw holes for easier assembly.
Stainless Steel Racks
(SUR·SURF·SURFD)
Suitable for food machinery due to SUS304 material’s rust-resistant quality.
[NOTE] The catalog numbers in the above table with (F) on the end have both ends machined so that they can be butted against each other to make any desired length. The items with (D) have mounting screw holes for easier assembly.
[NOTE1] Precision grade standard of racks are set by KHK. Please see “Precision of Racks” in Selection Hints section for details.
Plastic Racks
(DRF/DRFD/DRFK)
Plastic racks with little dimensional change, absorb lesser water than MC Nylon racks. J Series products are also available.
[NOTE1] Precision grade standard of racks are set by KHK. Please see “Precision of Racks” in Selection Hints section for details.
[NOTE1] The catalog numbers in the above table with (F) on the end have both ends machined so that they can be butted against each other to make any desired length. The items with (K)(D) have mounting screw holes for easier assembly.
Plastic Racks
(PR·PRF)
MC nylon is lightweight and can be used without lubricant.
[NOTE] The catalog numbers in the above table with (F) on the end have both ends machined so that they can be butted against each other to make any desired length.
[NOTE1] Precision grade standard of racks are set by KHK. Please see “Precision of Racks” in Selection Hints section for details.
Brass Racks
(BSR)
Small pitch racks of module 0.5~1. Mating pinions are BSS or DS series.
[NOTE1] Precision grade standard of racks are set by KHK. Please see “Precision of Racks” in Selection Hints section for details.
Round Racks
(SRO·SROS)
Secondary Operations
[NOTE1] Precision grade standard of racks are set by KHK. Please see “Precision of Racks” in Selection Hints section for details.
Round Racks
(SURO)
Same dimensions as SRO racks, except in stainless steel. Use where rust-resistance is required.
[NOTE1] Precision grade standard of racks are set by KHK. Please see “Precision of Racks” in Selection Hints section for details.
Molded Flexible Racks
(DR)
Can be used in applications due to flexibility of injection molded racks which metal racks are lacking in.
[NOTE1] Precision grade standard of racks are set by KHK. Please see “Precision of Racks” in Selection Hints section for details.
Ground Helical Racks
(KRHG・KRHGF・KRHGFD)
The hypoid-gear engagement position is dependent on the twist direction of the pinion thread. J Series products are also available.
[NOTE] The catalog numbers in the above table with (F) on the end have both ends machined so that they can be butted against each other to make any desired length. The items with (D) have mounting screw holes for easier assembly.
[NOTE1] Precision grade standard of racks are set by KHK. Please see “Precision of Racks” in Selection Hints section for details.
Helical Racks
(SRH·SRHF·SRHFD)
Effective in reducing noise and vibration due to larger contact ratio of helical gears.
[NOTE] The catalog numbers in the above table with (F) on the end have both ends machined so that they can be butted against each other to make any desired length. The items with (D) have mounting screw holes for easier assembly.
[NOTE1] Precision grade standard of racks are set by KHK. Please see “Precision of Racks” in Selection Hints section for details.
KHK Stock Gears [Racks]
List
Characteristics
   precaution    
 
KHK Technical Information

Catalog No.
NOTE1
Module Length mm
( ) denotes
no. of teeth
Material Heat treatment Tooth surface
finish
Precision
KHK R 001
NOTE 3
Features

MRGF・MRGFD

1.5~3 500 SCM415 Tooth area Carburized Ground 1 Has the highest strength and precision in the KHK standard rack series. Boltholes can be remachined as carburizing is applied only within the tooth area. J Series products are also available.
KRGF-H・KRGFD-H 1.5~3 500, 1000 SCM440 Thermal refined, teeth induction hardened Ground 1 Heat treated ground gears with high precision and strength has excellent cost-performance ratio. J Series products are also available.
KRG・KRGF・KRGD 1~3 100、500、1000 SCM440 Thermal refining Ground 1 Have excellent strength and wear resistance which allow your designs to be more compact.
SRG・SRGF・SRGFD・SRGFK
0.5~6 100、300、500、1000 S45C Teeth induction hardened NOTE 2 Ground 3 Reasonably priced ground racks with abrasion-resistant characteristics. Also available from the J-Series.
KRF-H・KRFD-H 1.5~5 1000 SCM440 Thermal refining and teeth induction hardened Ground 5 This is a strong rack made of Chromoly steel, treated by carburizing. Has high-strength, high wear resistance, and enables downsizing of SR racks. J Series products are also available.
SRF-H・
SRFD-H
1.5~6 1000 S45C Teeth induction hardened Hobbed 5 Stable Hardened racks with high strength, long life span are reasonably priced. J Series products are also available.
KRF・KRFD 1.5~5 500, 1000 SCM440 Thermal refining Hobbed 4 Increased strength with SCM440 material which is thermal refined.
SRAF・SRAFD・SRAFK 1.5~4 1000 S45C - Hobbed 4 This gear rack has the same tooth height and face width sizes, more compact and reasonably priced in comparison to SRF Racks.
SR 0.5~10 100、300、500 S45C Hobbed 4 Low cost with large selections of modules and numbers of teeth.J series products are also available.
SRF 0.5~10 300、500、 1000、1500、2000 S45C Hobbed 4 Low cost with large selections of modules and numbers of teeth.J series products are also available.
SRFD・SRFK 0.5~6 300、500、 1000、1500、2000 S45C Hobbed 4 Low cost with large selections of modules and numbers of teeth.J series products are also available.
SUR・SURF・SURFD 1~4 500、1000 SUS304 Solution treatment Hobbed 5 Suitable for food machinery due to SUS304 material’s rust-resistant quality.
DRF・DRFD・DRFK 1~3 500, 1000 Polyacetal - Hobbed 5 Plastic racks with little dimensional change, absorb lesser water than MC Nylon racks. J Series products are also available.
PR・PRF 1~3 500、1000 MC901 Hobbed 5 MC nylon is lightweight and can be used without lubricant.
BSR 0.5~1 300 C3604 Hobbed 4 Small pitch racks of module 0.5~1. Mating pinions are BSS or DS series.
DR 0.8~2 2000 Duracon
(M25-44)
Injection molded 8 Used in applications due to its flexibility, where metal racks do no have this attribute. Pinions and accessories are also available.
SRO・SROS 1~6 500、1000 S45C Hobbed 4 Convenient in applications where the rack has the reciprocal motion. S Type is easy to install.
SURO 1~3 500、1000 SUS303 Solution treatment Hobbed 5 Same dimensions as SRO racks, except in stainless steel. Use where rust-resistance is required.
KRHG・KRHGF・KRHGFD 1~3 100、500、1000 SCM440 Thermal refining Ground 1 The hypoid-gear engagement position is dependent on the twist direction of the pinion thread. J Series products are also available.
SRH・SRHF・SRHFD 2~3 100、500、1000 S45C Hobbed 5 Effective in reducing noise and vibration due to larger contact ratio of helical gears.
【NOTE1】 The catalog numbers in the above table with (F) on the end have both ends machined so that they can be butted against each other to make any desired length. The items with (K)(D) have mounting screw holes for easier assembly.
【NOTE2】 Tooth areas, where size is less than 0.8 module, without quenching treatment.Hardness level of gear surface ranges from 225HB to 260HB.
【NOTE3】 Precision grade standard of racks are set by KHK. Please see "Precision of Racks" in Selection Hints section for details.


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All Rights Reserved.