Introduction
| PAN PHILLIPS DOUBLE WASHER SEMS (SPLIT-LOCK & REGULAR FLAT WASHERS) | ||||||||||||||
| Nominal Size | W | H1 | G | F | T | R | M | Phillips Driver Size | ||||||
| Head Dai meter | Height of Head | Recess Depth | Flat washer Dai meter |
Flat Washer Thickness |
Split Lock Washer Diameter |
Split Lock Washe Materi al Thickness | ||||||||
| Max | Min | Max | Min | Max | Min | Max | Min | Max | Min | Max | Min | Ref | ||
| 4 | .219 | .204 | .080 | .070 | . | .053 | .382 | .369 | .045 | .036 | .208 | .194 | .031 | 1 |
| 6 | .270 | .255 | .097 | .086 | .080 | .055 | .445 | .432 | .045 | .036 | .261 | .247 | .034 | 2 |
| 8 | .321 | .305 | .115 | .104 07 | .097 | .071 | .507 | .494 | .045 | .036 | .319 | .304 | .031 | 2 |
| 10 | .373 | .356 | .133 | .121 | .113 | .089 | .569 | .556 | .045 | .036 | .373 | .358 | .047 | 2 |
| Description | A pan head machine screw with a free-spinning lock-washer and flat washer manufactured as one assembly | |
| Applications/ Advantages | The washer / screw assembly makes this a locking screw with the helical washer providing the locking action and flat washwer distributing the load over | |
| Material | Steel | Stainless |
| Steel Screws-AlSI1006 - 1022 or equivalent steel. Steel Washers-Spl-lock:SAE 1060 carbon steel; Flat washer: SAE 1008 carbon steel. | Stainless Screws- Class 304 stainless. Stainless Washers- Class 304 stainless |
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| Hardness | Steel Screws-Rockwell B70 - B100 (Unhardened) Steel Washers-Rockwell C38 - 46; Flat washer: Unhardened |
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| Tensile Strength | Steel. 60,000 psi minimum. No.4 SEMS screws shorter than 1/2"are not subject totensile testing. SEMS screws of diameters No. 6 to 10 indusive, which are shorter than 1/2" or 30 (where D is the nominal screw size in inches) are not subject to tensile testing. | |
| Plating | See Appendix-A for information on the plating of steel SEMS. | stainless sems are usually supplied with plain finish |