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The 640A Forged Knife Guard is a forged steel guard that mounts on the cutter bar of agricultural combine harvesters to protect and guide the reciprocating knife section during harvest. The guard is forged from 45# carbon steel and then induction hardened to HRC52-56, giving the top surface the wear resistance of a hardened tool while keeping the body ductile enough to absorb impact from stones and stubble. This is the standard 640A pattern used on John Deere, New Holland, Case, Claas and other major combine harvester cutter bars.
Raydafon produces the 640A Forged Knife Guard as an ISO 9001 certified manufacturer from the Ningbo factory, with forged-in-house production, full hardness verification and OEM replacement support. Standard colors are green, black, yellow, orange and gray; custom color matching is available for OEM programs.
A 640A Forged Knife Guard is a steel guard that bolts onto the cutter bar of an agricultural combine harvester. The guard has a forked front that sits between the reciprocating knife sections, guiding the knife so that the cutting edges on the knife and the guard shear against each other. The forged construction is what separates the 640A from lower-cost stamped or cast guards: forging aligns the grain flow of the steel with the direction of the load, so the guard resists bending and cracking better than a cast part of the same hardness.
The top surface of the 640A guard is induction hardened to HRC52-56 with a carburized case depth of 0.5mm, which gives the surface the wear resistance to survive continuous contact with the knife and stubble, while the deeper body stays softer and absorbs impact. This combination is what makes the 640A Forged Knife Guard suitable for both standard combines and high-capacity machines running in tough harvest conditions.
The table below lists the full specification of the 640A Forged Knife Guard. All values are confirmed against the original OEM part. For OEM replacement, Raydafon matches the mounting hole pattern, the fork geometry and the overall envelope before shipping.
| Parameter | Value |
|---|---|
| Item Name | Combine harvester knife guard |
| OEM Part No. | 640A |
| Process Craft | Forged |
| Material | 45# carbon steel |
| Heat Treatment (HRC) | Induction process HRC52-56 |
| Carburized Case Depth | 0.5 mm |
| Surface Treatment | Plastic spraying |
| Standard Colors | Green, black, yellow, orange, gray |
| Custom Colors | Available to customer requirement |
| Certificate | ISO 9001 |
| Design Support | Experienced designers; OEM drawings and samples accepted |
| Application | Agricultural combine harvester cutter bar |
Forging is the main cost driver in the 640A Forged Knife Guard, and it is also the reason the guard lasts longer than cast or stamped alternatives. The four advantages below are the ones that matter most in field conditions.
Forging aligns the steel grain flow with the shape of the guard. When the knife slams into the guard at the end of each stroke, the load runs along the grain rather than across it, so the guard resists cracking better than a cast part of the same hardness.
Induction hardening only hardens the top surface. The core of the 640A Forged Knife Guard stays ductile at 45# carbon steel, so when the guard hits a stone or a thick stalk, the hardened surface resists wear and the softer core absorbs the impact without shattering.
The HRC52-56 hardened surface and 0.5 mm carburized case depth are selected so the guard keeps its cutting edge after hundreds of hours of operation. Guards that are not hardened typically show rounded knife slots and reduced cutting efficiency after a single season.
The 640A Forged Knife Guard is a standard pattern that fits cutter bars on John Deere, New Holland, Case, Claas, Welger, KMC, Amadas, Gallignani, Kubota, Laverda, MTZ, Ford, Maschio, Goldoni, Howard and BCS combine harvesters. OEM replacement does not require modification to the cutter bar.
Raydafon produces the 640A Forged Knife Guard alongside a wider range of agricultural machinery replacement parts for tractors, combines, corn headers and balers. The categories below are the ones most often ordered together with the 640A guard.
To confirm the correct 640A Forged Knife Guard and issue a quotation, Raydafon needs the five items below. For a straight replacement of an existing 640A, the OEM part number alone is usually enough.
Send the five items below and Raydafon will confirm the specification, color and lead time within one working day.
The 640A Forged Knife Guard is used on the cutter bar of agricultural combine harvesters. It mounts between the reciprocating knife sections and provides the fixed cutting edge that shears against the knife. It is the standard 640A pattern used on John Deere, New Holland, Case, Claas and other major combine brands.
The 640A Forged Knife Guard is induction hardened to HRC52-56 with a carburized case depth of 0.5 mm. The hardened case provides wear resistance on the top surface, while the ductile 45# carbon steel core absorbs impact from stones and stubble.
The 640A Forged Knife Guard is forged, not cast and not stamped. Forging aligns the steel grain flow with the shape of the guard, so the guard resists bending and cracking better than a cast or stamped part of the same hardness.
Yes. Send the original part number, nameplate photo or a dimensioned drawing and Raydafon will confirm whether the mounting hole pattern, fork geometry and overall envelope match. Where the original is obsolete, a functionally equivalent guard can be produced against the same cutter bar configuration.
Standard colors are green, black, yellow, orange and gray. Custom color matching is available for OEM programs when the customer provides a color sample or a RAL number. Surface treatment is plastic spraying, applied over the forged and hardened body.
Standard quantities ship in 15 to 30 days. Custom colors and larger quantities are confirmed with the quotation. As an OEM manufacturer, Raydafon can supply from single units up to full production quantities. MOQ depends on the specific configuration and is confirmed when the specification is fixed.
Yes. Raydafon produces a full range of harvester knife guards, harvester knife sections, fodder feed mixer knives, plough shares and other agricultural machinery replacement parts. Custom patterns can be produced to a drawing or sample when the required pattern is not in the standard range.
Every 640A Forged Knife Guard shipment includes an outline drawing, a hardness inspection report and a material certificate on request. Third-party inspection can be arranged when the project specification calls for it.
Whether you are replacing worn guards on an existing cutter bar, building an OEM kit for a combine harvester program, or sourcing forged knife guards in volume for a distributor network, Raydafon can quote the 640A Forged Knife Guard or a custom equivalent to your pattern, hardness and color requirements. OEM and project quantities supplied directly from the Ningbo factory.
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Luotuo Industrial Area, Zhenhai District, Ningbo City, China
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